flet ui (experimental)

.gitattributes

@@ -1,15 +0,0 @@
-*.py text eol=lf
-*.md text eol=lf
-*.yml text eol=lf
-*.yaml text eol=lf
-*.toml text eol=lf
-*.json text eol=lf
-*.txt text eol=lf
-*.html text eol=lf
-*.css text eol=lf
-*.js text eol=lf
-*.sh text eol=lf
-*.cfg text eol=lf
-*.ini text eol=lf
-*.svg text eol=lf
-*.j2 text eol=lf

.github/workflows/test_pip.yml

@@ -1,9 +1,7 @@
-name: CI
+name: pip install
-run-name: CI
+run-name: pip install
-
+on: 
-on:
   push:
-    branches: [main]
     paths:
       - '**.py'
       - 'pyproject.toml'
@@ -13,41 +11,23 @@ on:
       - 'pyproject.toml'
       - '.github/workflows/**'
   workflow_dispatch:
-
 jobs:
-  test:
+  install-and-run:
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-14, windows-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
         python-version: ['3.12']
       fail-fast: false
+    continue-on-error: true
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v7
+        uses: actions/checkout@v4
-
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-
+      - name: Install from repository
-      - name: Install uv
+        run: python -m pip install .
-        uses: astral-sh/setup-uv@v8.3.1
+      #- name: Run abogen
-        with:
+      #  run: abogen
-          enable-cache: true
-          prune-cache: false
-          cache-dependency-glob: pyproject.toml
-
-      - name: Install system dependencies (Ubuntu)
-        if: runner.os == 'Linux'
-        run: sudo apt-get update && sudo apt-get install -y libegl1
-
-      - name: Install dependencies
-        run: uv pip install --system .[dev]
-        env:
-          UV_LINK_MODE: copy
-
-      - name: Run tests
-        env:
-          QT_QPA_PLATFORM: offscreen
-        run: pytest tests/ -v --tb=short

.github/workflows/test_publish.yml

@@ -18,7 +18,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v7
+    - uses: actions/checkout@v4
 
     - name: Login to Github Container Registry
       # Only if we need to push an image

abogen/assets/settings.svg

@@ -1,31 +1,31 @@
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+<?xml version="1.0" encoding="utf-8"?>
-
+
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
+<!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
-<svg height="800px" width="800px" version="1.1" id="_x32_" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" 
+<svg height="800px" width="800px" version="1.1" id="_x32_" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" 
-	 viewBox="0 0 512 512"  xml:space="preserve">
+	 viewBox="0 0 512 512"  xml:space="preserve">
-<style type="text/css">
+<style type="text/css">
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+	.st0{fill:#808080;}
-</style>
+</style>
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 </svg>

abogen/constants.py

@@ -63,6 +63,64 @@ SUPPORTED_INPUT_FORMATS = [
 # 384 if self.lang_code in 'ab':
 SUPPORTED_LANGUAGES_FOR_SUBTITLE_GENERATION = list(LANGUAGE_DESCRIPTIONS.keys())
 
+# Voice and sample text constants
+VOICES_INTERNAL = [
+    "af_alloy",
+    "af_aoede",
+    "af_bella",
+    "af_heart",
+    "af_jessica",
+    "af_kore",
+    "af_nicole",
+    "af_nova",
+    "af_river",
+    "af_sarah",
+    "af_sky",
+    "am_adam",
+    "am_echo",
+    "am_eric",
+    "am_fenrir",
+    "am_liam",
+    "am_michael",
+    "am_onyx",
+    "am_puck",
+    "am_santa",
+    "bf_alice",
+    "bf_emma",
+    "bf_isabella",
+    "bf_lily",
+    "bm_daniel",
+    "bm_fable",
+    "bm_george",
+    "bm_lewis",
+    "ef_dora",
+    "em_alex",
+    "em_santa",
+    "ff_siwis",
+    "hf_alpha",
+    "hf_beta",
+    "hm_omega",
+    "hm_psi",
+    "if_sara",
+    "im_nicola",
+    "jf_alpha",
+    "jf_gongitsune",
+    "jf_nezumi",
+    "jf_tebukuro",
+    "jm_kumo",
+    "pf_dora",
+    "pm_alex",
+    "pm_santa",
+    "zf_xiaobei",
+    "zf_xiaoni",
+    "zf_xiaoxiao",
+    "zf_xiaoyi",
+    "zm_yunjian",
+    "zm_yunxi",
+    "zm_yunxia",
+    "zm_yunyang",
+]
+
 # Voice and sample text mapping
 SAMPLE_VOICE_TEXTS = {
     "a": "This is a sample of the selected voice.",

abogen/frontend/__init__.py

@@ -0,0 +1,8 @@
+"""
+Abogen Flet Frontend Package.
+
+This package provides a unified, dual-target (desktop + web) user interface
+for the Abogen audiobook generation application, built with the Flet framework.
+"""
+
+__all__ = ["main"]

abogen/frontend/components/__init__.py

@@ -0,0 +1,32 @@
+"""Components sub-package."""
+from .widgets import (
+    resolve_icon,
+    build_drop_zone,
+    build_log_terminal,
+    log_entry,
+    build_progress_row,
+    build_primary_button,
+    build_secondary_button,
+    build_card,
+    build_section_header,
+    build_status_badge,
+    labelled_row,
+    show_snack,
+    build_divider,
+)
+
+__all__ = [
+    "build_drop_zone",
+    "resolve_icon",
+    "build_log_terminal",
+    "log_entry",
+    "build_progress_row",
+    "build_primary_button",
+    "build_secondary_button",
+    "build_card",
+    "build_section_header",
+    "build_status_badge",
+    "labelled_row",
+    "show_snack",
+    "build_divider",
+]

abogen/frontend/components/widgets.py

@@ -0,0 +1,630 @@
+"""
+Reusable UI components for the Abogen Flet frontend.
+
+Each function in this module returns a standalone Flet control or small
+widget tree.  Components read the current palette from the page's theme
+mode and should not hold any mutable state themselves – state lives in the
+session's ``AppState`` object.
+"""
+
+from __future__ import annotations
+
+from typing import Any, Callable, List, Optional
+
+import flet as ft
+
+from ..utils.theme import get_palette, RADIUS_MD, RADIUS_SM, SPACE_SM, SPACE_MD, SPACE_LG
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+
+def resolve_icon(icon: Any) -> Any:
+    """Convert a snake_case icon name to Flet IconData when possible."""
+    if isinstance(icon, str):
+        return getattr(ft.Icons, icon.upper(), icon)
+    return icon
+
+
+# ---------------------------------------------------------------------------
+# Drop-zone (file input area)
+# ---------------------------------------------------------------------------
+
+
+def build_drop_zone(
+    *,
+    on_pick: Callable[[], None],
+    label: str = "Drag & drop your file here or click to browse",
+    sub_label: str = "Supports: .txt · .epub · .pdf · .md · .srt · .ass · .vtt",
+    accent: bool = False,
+    error: bool = False,
+    filename: Optional[str] = None,
+    file_size: Optional[str] = None,
+    char_count: Optional[str] = None,
+    page: Optional[ft.Page] = None,
+) -> ft.GestureDetector:
+    """
+    Build an interactive file drop-zone widget.
+
+    The zone shows a dashed border and centred instructions by default,
+    switching to an 'active' green style when a file is loaded and a red
+    style when an error has occurred.
+
+    Args:
+        on_pick: Callback invoked when the user clicks or activates the zone.
+        label: Primary instruction text.
+        sub_label: Secondary hint text shown beneath the label.
+        accent: When True, renders the 'active/success' green style.
+        error: When True, renders the 'error/red' style.
+        filename: When provided, replaces the instruction text with file info.
+        file_size: Human-readable file size to display alongside the filename.
+        char_count: Character count to display alongside file info.
+        page: The current Flet ``Page``; used to derive the active palette.
+
+    Returns:
+        A ``ft.GestureDetector`` wrapping the visual drop-zone container.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    p = get_palette(page) if page else None
+
+    # Colour scheme
+    if error:
+        border_color = "#e84e3c" if dark else "#c0392b"
+        bg_color = "#1a0a08" if dark else "#fff5f5"
+        text_color = "#e84e3c" if dark else "#c0392b"
+        icon_name = "error_outline"
+    elif accent:
+        border_color = "#42ad4a" if dark else "#2e9437"
+        bg_color = "#091810" if dark else "#f0fff1"
+        text_color = "#42ad4a" if dark else "#2e9437"
+        icon_name = "check_circle_outline"
+    else:
+        border_color = "#3a4466" if dark else "#a8b4d0"
+        bg_color = "#151928" if dark else "#f7f8fd"
+        text_color = "#9ba3b8" if dark else "#5a6172"
+        icon_name = "upload_file"
+
+    if filename:
+        # Compact file-info display
+        info_rows: List[ft.Control] = [
+            ft.Row(
+                [
+                    ft.Icon(resolve_icon("insert_drive_file"), color=text_color, size=28),
+                    ft.Column(
+                        [
+                            ft.Text(
+                                filename,
+                                weight=ft.FontWeight.W_600,
+                                size=13,
+                                color=text_color,
+                                no_wrap=False,
+                                max_lines=2,
+                                overflow=ft.TextOverflow.ELLIPSIS,
+                            ),
+                        ],
+                        tight=True,
+                        expand=True,
+                    ),
+                ],
+                alignment=ft.MainAxisAlignment.CENTER,
+                spacing=SPACE_SM,
+            )
+        ]
+        if file_size or char_count:
+            chips: List[ft.Control] = []
+            if file_size:
+                chips.append(
+                    ft.Text(f"📄 {file_size}", size=11, color=text_color, italic=True)
+                )
+            if char_count:
+                chips.append(
+                    ft.Text(f"🔤 {char_count} chars", size=11, color=text_color, italic=True)
+                )
+            info_rows.append(
+                ft.Row(chips, alignment=ft.MainAxisAlignment.CENTER, spacing=SPACE_MD)
+            )
+        content = ft.Column(
+            info_rows,
+            alignment=ft.MainAxisAlignment.CENTER,
+            horizontal_alignment=ft.CrossAxisAlignment.CENTER,
+            spacing=SPACE_SM,
+        )
+    else:
+        content = ft.Column(
+            [
+                ft.Icon(resolve_icon(icon_name), size=48, color=border_color, opacity=0.8),
+                ft.Text(
+                    label,
+                    size=14,
+                    weight=ft.FontWeight.W_500,
+                    color=text_color,
+                    text_align=ft.TextAlign.CENTER,
+                ),
+                ft.Text(
+                    sub_label,
+                    size=11,
+                    color=text_color,
+                    opacity=0.6,
+                    text_align=ft.TextAlign.CENTER,
+                ),
+            ],
+            alignment=ft.MainAxisAlignment.CENTER,
+            horizontal_alignment=ft.CrossAxisAlignment.CENTER,
+            spacing=SPACE_SM,
+        )
+
+    inner = ft.Container(
+        content=content,
+        border=ft.Border.all(2, border_color),
+        border_radius=RADIUS_MD,
+        bgcolor=bg_color,
+        padding=ft.Padding.all(SPACE_LG),
+        height=160,
+        alignment=ft.Alignment.CENTER,
+        expand=True,
+    )
+
+    return ft.GestureDetector(
+        content=ft.Row([inner], spacing=0),
+        on_tap=lambda _: on_pick(),
+        mouse_cursor=ft.MouseCursor.CLICK,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Log terminal
+# ---------------------------------------------------------------------------
+
+
+def build_log_terminal(
+    *,
+    ref: Optional[ft.Ref] = None,
+    max_height: int = 260,
+    page: Optional[ft.Page] = None,
+) -> ft.Container:
+    """
+    Build a scrollable, read-only log terminal widget.
+
+    Args:
+        ref: Optional ``ft.Ref[ft.ListView]`` to bind the inner list-view so
+             callers can append entries programmatically.
+        max_height: Maximum pixel height before vertical scrolling activates.
+        page: Current Flet ``Page`` for palette derivation.
+
+    Returns:
+        A styled ``ft.Container`` wrapping a ``ft.ListView``.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    bg = "#0d1117" if dark else "#f8f9fc"
+    text_color = "#b0b8cc" if dark else "#3d4358"
+    border_color = "#252a38" if dark else "#dce0ea"
+
+    list_view = ft.ListView(
+        expand=True,
+        auto_scroll=True,
+        spacing=1,
+        padding=ft.Padding.all(SPACE_SM),
+    )
+    if ref is not None:
+        ref.current = list_view
+
+    return ft.Container(
+        content=list_view,
+        bgcolor=bg,
+        border=ft.Border.all(1, border_color),
+        border_radius=RADIUS_SM,
+        height=max_height,
+        clip_behavior=ft.ClipBehavior.HARD_EDGE,
+    )
+
+
+def log_entry(message: str, level: str = "info", page: Optional[ft.Page] = None) -> ft.Text:
+    """
+    Create a single log-line ``ft.Text`` widget with appropriate colour coding.
+
+    Args:
+        message: The log message string.
+        level: Severity string: ``'info'``, ``'success'``, ``'error'``,
+               ``'warning'``, ``'debug'``, ``'critical'``.
+        page: Current Flet ``Page`` for dark/light mode detection.
+
+    Returns:
+        A styled ``ft.Text`` control.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    palette: dict[str, str] = {
+        "info": "#9ba3b8" if dark else "#5a6172",
+        "success": "#42ad4a" if dark else "#2e9437",
+        "error": "#e84e3c" if dark else "#c0392b",
+        "warning": "#f5a623" if dark else "#d4870a",
+        "debug": "#5a6172" if dark else "#9ba3b8",
+        "critical": "#ff5722",
+        "trace": "#4e5568" if dark else "#b0b8cc",
+    }
+    color = palette.get(level.lower(), palette["info"])
+    return ft.Text(message, size=12, color=color, selectable=True, no_wrap=False)
+
+
+# ---------------------------------------------------------------------------
+# Progress row
+# ---------------------------------------------------------------------------
+
+
+def build_progress_row(
+    *,
+    progress_value: float = 0.0,
+    etr_text: str = "",
+    page: Optional[ft.Page] = None,
+) -> ft.Column:
+    """
+    Build a progress-bar + ETR-label column.
+
+    Args:
+        progress_value: Float in [0.0, 1.0].
+        etr_text: Pre-formatted estimated-time-remaining string.
+        page: Current ``Page`` for palette derivation.
+
+    Returns:
+        A ``ft.Column`` containing the progress bar and label.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    fill = "#5b8af5" if dark else "#3a5fc4"
+    bg = "#1e2230" if dark else "#e4e8f0"
+
+    bar = ft.ProgressBar(
+        value=progress_value,
+        color=fill,
+        bgcolor=bg,
+        height=8,
+        border_radius=ft.BorderRadius.all(4),
+        expand=True,
+    )
+    label = ft.Text(
+        etr_text,
+        size=11,
+        color="#9ba3b8" if dark else "#5a6172",
+        text_align=ft.TextAlign.CENTER,
+    )
+    return ft.Column(
+        [bar, label],
+        spacing=SPACE_SM,
+        horizontal_alignment=ft.CrossAxisAlignment.CENTER,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Primary action button
+# ---------------------------------------------------------------------------
+
+
+def build_primary_button(
+    text: str,
+    *,
+    icon: Optional[str] = None,
+    on_click: Optional[Callable] = None,
+    disabled: bool = False,
+    width: Optional[int] = None,
+    page: Optional[ft.Page] = None,
+) -> ft.ElevatedButton:
+    """
+    Build a prominent, styled primary action button.
+
+    Args:
+        text: Button label.
+        icon: Optional Flet icon name (e.g. ``'play_arrow'``).
+        on_click: Click callback.
+        disabled: Whether the button is non-interactive.
+        width: Optional fixed pixel width.
+        page: Current ``Page`` for accent colour derivation.
+
+    Returns:
+        A styled ``ft.ElevatedButton``.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    bg = "#5b8af5" if dark else "#3a5fc4"
+    on_bg = "#ffffff"
+
+    style = ft.ButtonStyle(
+        bgcolor={
+            ft.ControlState.DEFAULT: bg,
+            ft.ControlState.HOVERED: "#3a5fc4" if dark else "#2a4fae",
+            ft.ControlState.DISABLED: "#2a2f3f" if dark else "#c0c8d8",
+        },
+        color={
+            ft.ControlState.DEFAULT: on_bg,
+            ft.ControlState.DISABLED: "#4e5568" if dark else "#9ba3b8",
+        },
+        elevation={"default": 2, "hovered": 4},
+        padding=ft.Padding.symmetric(horizontal=SPACE_LG, vertical=SPACE_MD),
+        shape=ft.RoundedRectangleBorder(radius=RADIUS_SM),
+        animation_duration=150,
+    )
+
+    return ft.ElevatedButton(
+        content=text,
+        icon=resolve_icon(icon),
+        on_click=on_click,
+        disabled=disabled,
+        width=width,
+        style=style,
+        height=48,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Secondary / ghost button
+# ---------------------------------------------------------------------------
+
+
+def build_secondary_button(
+    text: str,
+    *,
+    icon: Optional[str] = None,
+    on_click: Optional[Callable] = None,
+    disabled: bool = False,
+    page: Optional[ft.Page] = None,
+) -> ft.OutlinedButton:
+    """
+    Build a secondary outlined button.
+
+    Args:
+        text: Button label.
+        icon: Optional Flet icon name.
+        on_click: Click callback.
+        disabled: Whether the button is non-interactive.
+        page: Current ``Page`` for border colour derivation.
+
+    Returns:
+        A styled ``ft.OutlinedButton``.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    border_clr = "#3a4466" if dark else "#a8b4d0"
+    text_clr = "#e8eaf0" if dark else "#1a1d27"
+
+    style = ft.ButtonStyle(
+        side={
+            ft.ControlState.DEFAULT: ft.BorderSide(1.5, border_clr),
+            ft.ControlState.HOVERED: ft.BorderSide(1.5, "#5b8af5" if dark else "#3a5fc4"),
+        },
+        color={
+            ft.ControlState.DEFAULT: text_clr,
+            ft.ControlState.HOVERED: "#5b8af5" if dark else "#3a5fc4",
+            ft.ControlState.DISABLED: "#4e5568" if dark else "#9ba3b8",
+        },
+        padding=ft.Padding.symmetric(horizontal=SPACE_LG, vertical=SPACE_MD),
+        shape=ft.RoundedRectangleBorder(radius=RADIUS_SM),
+        animation_duration=150,
+    )
+
+    return ft.OutlinedButton(
+        content=text,
+        icon=resolve_icon(icon),
+        on_click=on_click,
+        disabled=disabled,
+        style=style,
+        height=44,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Section card
+# ---------------------------------------------------------------------------
+
+
+def build_card(
+    content: ft.Control,
+    *,
+    padding: int = SPACE_LG,
+    page: Optional[ft.Page] = None,
+) -> ft.Container:
+    """
+    Wrap a control in a styled card container.
+
+    Args:
+        content: The child control to embed.
+        padding: Internal padding in pixels.
+        page: Current ``Page`` for palette derivation.
+
+    Returns:
+        A styled ``ft.Container``.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    bg = "#181b23" if dark else "#ffffff"
+    border_clr = "#2c3147" if dark else "#dce0ea"
+
+    return ft.Container(
+        content=content,
+        bgcolor=bg,
+        border=ft.Border.all(1, border_clr),
+        border_radius=RADIUS_MD,
+        padding=ft.Padding.all(padding),
+        shadow=ft.BoxShadow(
+            spread_radius=0,
+            blur_radius=12,
+            color=ft.Colors.with_opacity(0.12 if dark else 0.06, ft.Colors.BLACK),
+            offset=ft.Offset(0, 2),
+        ),
+    )
+
+
+# ---------------------------------------------------------------------------
+# Section header
+# ---------------------------------------------------------------------------
+
+
+def build_section_header(
+    title: str,
+    *,
+    subtitle: Optional[str] = None,
+    icon: Optional[str] = None,
+    page: Optional[ft.Page] = None,
+) -> ft.Row:
+    """
+    Build a consistent section header row with an optional icon.
+
+    Args:
+        title: Section heading text.
+        subtitle: Optional explanatory sub-text.
+        icon: Optional Flet icon name.
+        page: Current ``Page`` for palette derivation.
+
+    Returns:
+        A ``ft.Row`` containing the icon and text column.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    title_color = "#e8eaf0" if dark else "#1a1d27"
+    sub_color = "#9ba3b8" if dark else "#5a6172"
+    accent = "#5b8af5" if dark else "#3a5fc4"
+
+    children: List[ft.Control] = []
+    if icon:
+        children.append(ft.Icon(resolve_icon(icon), size=20, color=accent))
+
+    text_parts: List[ft.Control] = [
+        ft.Text(title, size=15, weight=ft.FontWeight.W_600, color=title_color)
+    ]
+    if subtitle:
+        text_parts.append(ft.Text(subtitle, size=11, color=sub_color))
+
+    children.append(
+        ft.Column(text_parts, spacing=1, tight=True, expand=True)
+    )
+
+    return ft.Row(children, spacing=SPACE_SM, vertical_alignment=ft.CrossAxisAlignment.START)
+
+
+# ---------------------------------------------------------------------------
+# Status badge
+# ---------------------------------------------------------------------------
+
+
+def build_status_badge(
+    label: str,
+    *,
+    variant: str = "info",
+    page: Optional[ft.Page] = None,
+) -> ft.Container:
+    """
+    Build a small status badge chip.
+
+    Args:
+        label: Badge text.
+        variant: Colour variant: ``'info'``, ``'success'``, ``'error'``,
+                 ``'warning'``, ``'neutral'``.
+        page: Current ``Page`` for theme derivation.
+
+    Returns:
+        A pill-shaped ``ft.Container``.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    palette = {
+        "info":    ("#1a2a5e" if dark else "#dde8ff", "#5b8af5" if dark else "#3a5fc4"),
+        "success": ("#0d2010" if dark else "#d4f4d7", "#42ad4a" if dark else "#2e9437"),
+        "error":   ("#2a0a08" if dark else "#ffe0dc", "#e84e3c" if dark else "#c0392b"),
+        "warning": ("#2a1a00" if dark else "#fff4d8", "#f5a623" if dark else "#d4870a"),
+        "neutral": ("#1e2230" if dark else "#edf0f5", "#9ba3b8" if dark else "#5a6172"),
+    }
+    bg, fg = palette.get(variant, palette["info"])
+
+    return ft.Container(
+        content=ft.Text(label, size=10, weight=ft.FontWeight.W_600, color=fg),
+        bgcolor=bg,
+        border_radius=999,
+        padding=ft.Padding.symmetric(horizontal=8, vertical=3),
+    )
+
+
+# ---------------------------------------------------------------------------
+# Labelled control row
+# ---------------------------------------------------------------------------
+
+
+def labelled_row(
+    label: str,
+    control: ft.Control,
+    *,
+    label_width: int = 200,
+    tooltip: Optional[str] = None,
+    page: Optional[ft.Page] = None,
+) -> ft.Row:
+    """
+    Lay a label and a control side-by-side in a consistent row.
+
+    Args:
+        label: Human-readable label text.
+        control: The UI control placed to the right of the label.
+        label_width: Fixed pixel width of the label column.
+        tooltip: Optional tooltip text on the label.
+        page: Current ``Page`` for palette derivation.
+
+    Returns:
+        A ``ft.Row`` with the label pinned to a fixed width.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    lbl_color = "#9ba3b8" if dark else "#5a6172"
+
+    lbl = ft.Text(label, size=13, color=lbl_color, weight=ft.FontWeight.W_500, width=label_width)
+    if tooltip:
+        lbl.tooltip = tooltip
+
+    return ft.Row(
+        [lbl, ft.Container(content=control, expand=True)],
+        alignment=ft.MainAxisAlignment.START,
+        vertical_alignment=ft.CrossAxisAlignment.CENTER,
+        spacing=SPACE_MD,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Snack-bar helper
+# ---------------------------------------------------------------------------
+
+
+def show_snack(
+    page: ft.Page,
+    message: str,
+    *,
+    error: bool = False,
+    duration: int = 3000,
+) -> None:
+    """
+    Display a brief snack-bar notification.
+
+    Args:
+        page: The Flet ``Page`` instance.
+        message: Text to display.
+        error: When True, colours the bar red instead of the default accent.
+        duration: Visible duration in milliseconds.
+    """
+    dark = page.theme_mode == ft.ThemeMode.DARK
+    bg = "#e84e3c" if error else ("#5b8af5" if dark else "#3a5fc4")
+    page.snack_bar = ft.SnackBar(
+        content=ft.Text(message, color="#ffffff", size=13),
+        bgcolor=bg,
+        duration=duration,
+        show_close_icon=True,
+        close_icon_color="#ffffff",
+    )
+    page.snack_bar.open = True
+    page.update()
+
+
+# ---------------------------------------------------------------------------
+# Divider helper
+# ---------------------------------------------------------------------------
+
+
+def build_divider(page: Optional[ft.Page] = None) -> ft.Divider:
+    """
+    Build a styled horizontal rule divider.
+
+    Args:
+        page: Current ``Page`` for palette derivation.
+
+    Returns:
+        A ``ft.Divider``.
+    """
+    dark = page is not None and page.theme_mode == ft.ThemeMode.DARK
+    return ft.Divider(color="#252a38" if dark else "#e8ebf2", height=1, thickness=1)

abogen/frontend/main.py

@@ -0,0 +1,365 @@
+"""
+Abogen Flet Frontend – main entry point.
+
+Run as desktop app:
+    python -m abogen.frontend.main
+
+Run as web app (binds to port 8080 by default):
+    python -m abogen.frontend.main --web --port 8080
+
+Architecture
+------------
+One ``ft.app()`` call launches the server.  For every new browser tab (or the
+desktop window) Flet invokes ``_app_entry(page)`` in its own coroutine, which
+creates a fresh ``AppState`` and wires together the navigation rail and views.
+This guarantees complete per-session isolation in multi-user web deployments.
+"""
+from __future__ import annotations
+
+import argparse
+import sys
+from pathlib import Path
+from typing import Optional
+
+import flet as ft
+
+from .state import AppState
+from .components import resolve_icon
+from .views.dashboard import DashboardView
+from .views.settings import SettingsView
+from .views.queue_view import QueueView
+from .utils.theme import make_theme, DARK, LIGHT, SPACE_SM, SPACE_MD, SPACE_LG, RADIUS_MD
+from abogen.constants import PROGRAM_NAME as APP_NAME
+
+
+# ---------------------------------------------------------------------------
+# Navigation destinations
+# ---------------------------------------------------------------------------
+
+_NAV_ITEMS = [
+    ("Convert", "swap_horiz", "swap_horiz"),
+    ("Queue",   "list_alt",   "list_alt"),
+    ("Settings", "settings",  "settings"),
+]
+
+_ASSETS_DIR = Path(__file__).resolve().parents[1] / "assets"
+
+
+def _build_sidebar_item(
+    *,
+    label: str,
+    icon: str,
+    selected: bool,
+    palette,
+    on_click,
+) -> ft.Container:
+    accent = palette.accent if selected else palette.text_secondary
+    bg = palette.sidebar_selected_bg if selected else palette.sidebar_bg
+    return ft.Container(
+        content=ft.Row(
+            [
+                ft.Icon(resolve_icon(icon), size=20, color=accent),
+                ft.Text(
+                    label,
+                    size=13,
+                    weight=ft.FontWeight.W_600 if selected else ft.FontWeight.W_500,
+                    color=accent,
+                ),
+            ],
+            spacing=SPACE_MD,
+            vertical_alignment=ft.CrossAxisAlignment.CENTER,
+        ),
+        bgcolor=bg,
+        border_radius=RADIUS_MD,
+        padding=ft.Padding.symmetric(horizontal=SPACE_MD, vertical=10),
+        ink=True,
+        on_click=on_click,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Per-session entry point
+# ---------------------------------------------------------------------------
+
+def _app_entry(page: ft.Page) -> None:
+    try:
+        # ── State ────────────────────────────────────────────────────────────
+        state = AppState()
+        state.load_from_config()
+
+        # ── Page basics ──────────────────────────────────────────────────────
+        page.title = APP_NAME
+        page.padding = 0
+        page.spacing = 0
+        page.bgcolor = DARK.bg_base
+        page.theme_mode = ft.ThemeMode.DARK
+        page.theme = make_theme(dark=True)
+        page.dark_theme = make_theme(dark=True)
+        page.fonts = {}
+        page.window.min_width = 520
+        page.window.min_height = 600
+        page.update()
+
+        # ── Content area ref ─────────────────────────────────────────────────
+        content_area = ft.Column(expand=True, spacing=0)
+        sidebar_body = ft.Column(spacing=SPACE_SM)
+        theme_button_host = ft.Container()
+        brand_title = ft.Text(
+            APP_NAME,
+            size=18,
+            weight=ft.FontWeight.W_700,
+            color=DARK.text_primary,
+        )
+        brand_fallback_icon = ft.Icon(resolve_icon("speaker_notes"), size=32, color=DARK.accent)
+        divider = ft.VerticalDivider(width=1, color=DARK.border)
+
+        # ── Views ────────────────────────────────────────────────────────────
+        dashboard_view = DashboardView(page, state)
+        settings_view = SettingsView(page, state)
+        queue_view = QueueView(page, state)
+
+        views = [
+            dashboard_view.build,
+            queue_view.build,
+            settings_view.build,
+        ]
+        _selected_index = [0]
+
+        def _refresh_sidebar() -> None:
+            dark = page.theme_mode == ft.ThemeMode.DARK
+            pal = DARK if dark else LIGHT
+            sidebar_body.controls = [
+                _build_sidebar_item(
+                    label=label,
+                    icon=icon,
+                    selected=index == _selected_index[0],
+                    palette=pal,
+                    on_click=lambda _, i=index: _navigate(i),
+                )
+                for index, (label, icon, _) in enumerate(_NAV_ITEMS)
+            ]
+            sidebar.bgcolor = pal.sidebar_bg
+            divider.color = pal.border
+            brand_title.color = pal.text_primary
+            brand_fallback_icon.color = pal.accent
+            theme_button_host.content = ft.Container(
+                content=ft.Icon(
+                    resolve_icon("dark_mode" if dark else "light_mode"),
+                    size=20,
+                    color=pal.text_secondary,
+                ),
+                tooltip="Toggle theme",
+                border_radius=RADIUS_MD,
+                padding=8,
+                ink=True,
+                on_click=lambda _: _toggle_theme(page, _refresh_sidebar),
+            )
+
+        def _navigate(index: int) -> None:
+            _selected_index[0] = index
+            content_area.controls.clear()
+            built = views[index]()
+            content_area.controls.append(
+                ft.Container(
+                    content=built,
+                    expand=True,
+                    padding=ft.Padding.symmetric(horizontal=SPACE_LG, vertical=SPACE_LG),
+                )
+            )
+            _refresh_sidebar()
+            page.update()
+
+        # ── Sidebar ──────────────────────────────────────────────────────────
+        pal = DARK
+        sidebar = ft.Container(
+            width=220,
+            bgcolor=pal.sidebar_bg,
+            padding=ft.Padding.all(SPACE_MD),
+            content=ft.Column(
+                [
+                    ft.Container(
+                        content=ft.Row(
+                            [
+                                ft.Image(
+                                    src="icon.png",
+                                    width=36,
+                                    height=36,
+                                    fit=ft.BoxFit.CONTAIN,
+                                    error_content=brand_fallback_icon,
+                                ),
+                                brand_title,
+                            ],
+                            spacing=SPACE_MD,
+                            vertical_alignment=ft.CrossAxisAlignment.CENTER,
+                        ),
+                        padding=ft.Padding.only(top=SPACE_SM, bottom=SPACE_LG),
+                    ),
+                    sidebar_body,
+                    ft.Container(expand=True),
+                    ft.Row([theme_button_host], alignment=ft.MainAxisAlignment.END),
+                ],
+                expand=True,
+                spacing=SPACE_SM,
+            ),
+        )
+        _refresh_sidebar()
+
+        # ── Page handle for pubsub (queue → dashboard) ───────────────────────
+        def _handle_pubsub(topic: str) -> None:
+            if topic == "start_queue":
+                _navigate(0)
+
+        page.pubsub.subscribe(_handle_pubsub)
+
+        # ── Layout ────────────────────────────────────────────────────────────
+        page.add(
+            ft.Row(
+                [
+                    sidebar,
+                    divider,
+                    ft.Container(content=content_area, expand=True),
+                ],
+                expand=True,
+                spacing=0,
+                vertical_alignment=ft.CrossAxisAlignment.START,
+            )
+        )
+
+        # Show dashboard by default
+        _navigate(0)
+        page.update()
+    except Exception as e:
+        import traceback
+        traceback.print_exc()
+        print(f"ERROR IN _app_entry: {e}")
+        raise
+
+
+def _toggle_theme(page: ft.Page, refresh_sidebar) -> None:
+    """Switch between dark and light theme modes."""
+    if page.theme_mode == ft.ThemeMode.DARK:
+        page.theme_mode = ft.ThemeMode.LIGHT
+        page.bgcolor = LIGHT.bg_base
+    else:
+        page.theme_mode = ft.ThemeMode.DARK
+        page.bgcolor = DARK.bg_base
+
+    page.theme = make_theme(page.theme_mode == ft.ThemeMode.DARK)
+    refresh_sidebar()
+    page.update()
+
+
+# ---------------------------------------------------------------------------
+# CLI helpers & entry point
+# ---------------------------------------------------------------------------
+
+def _is_port_free(host: str, port: int) -> bool:
+    import socket
+    try:
+        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+            s.bind((host, port))
+            return True
+    except OSError:
+        return False
+
+
+def _find_free_port(host: str, start_port: int) -> int:
+    import socket
+    port = start_port
+    while port < 65535:
+        try:
+            with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+                s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+                s.bind((host, port))
+                return port
+        except OSError:
+            port += 1
+    return start_port
+
+
+def main() -> None:
+    """
+    Start the Abogen Flet frontend.
+
+    Parses ``--web`` and ``--port`` CLI arguments to choose desktop vs. web
+    mode, then hands control to ``ft.app()``.
+    """
+    import logging
+    logging.basicConfig(level=logging.INFO)
+    logging.getLogger("flet").setLevel(logging.INFO)
+
+    parser = argparse.ArgumentParser(description=f"{APP_NAME} – Flet frontend")
+    parser.add_argument(
+        "--web", action="store_true",
+        help="Run as a web server instead of a desktop window.",
+    )
+    parser.add_argument(
+        "--port", type=int, default=8080,
+        help="Port for the web server (default: 8080). Ignored in desktop mode.",
+    )
+    parser.add_argument(
+        "--host", default="127.0.0.1",
+        help="Host for the web server (default: 127.0.0.1). Use 0.0.0.0 to expose publicly.",
+    )
+    args = parser.parse_args()
+
+    if args.web:
+        port_specified = "--port" in sys.argv
+        target_port = args.port
+
+        if not port_specified:
+            target_port = _find_free_port(args.host, 8080)
+            if target_port != 8080:
+                print(f"Port 8080 is in use. Automatically routed to free port: {target_port}")
+        else:
+            if not _is_port_free(args.host, target_port):
+                print(f"Error: Port {target_port} is already in use on {args.host}.", file=sys.stderr)
+                print("Please select a different port or omit the --port flag to find one automatically.", file=sys.stderr)
+                sys.exit(1)
+
+        print(f"Starting Abogen WebUI on http://{args.host}:{target_port} ...")
+        ft.app(
+            target=_app_entry,
+            view=ft.AppView.WEB_BROWSER,
+            port=target_port,
+            host=args.host,
+            assets_dir=str(_ASSETS_DIR) if _ASSETS_DIR.exists() else None,
+            no_cdn=True,
+            web_renderer="canvaskit",
+        )
+    else:
+        try:
+            ft.app(
+                target=_app_entry,
+                view=ft.AppView.FLET_APP,
+                assets_dir=str(_ASSETS_DIR) if _ASSETS_DIR.exists() else None,
+            )
+        except Exception as e:
+            print(f"Warning: Failed to launch native desktop window: {e}", file=sys.stderr)
+            print("Falling back to running as a web application in your default browser...", file=sys.stderr)
+            target_port = _find_free_port("127.0.0.1", 8080)
+            print(f"Starting Abogen WebUI on http://127.0.0.1:{target_port} ...")
+            ft.app(
+                target=_app_entry,
+                view=ft.AppView.WEB_BROWSER,
+                port=target_port,
+                host="127.0.0.1",
+                assets_dir=str(_ASSETS_DIR) if _ASSETS_DIR.exists() else None,
+                no_cdn=True,
+                web_renderer="canvaskit",
+            )
+
+
+def main_web() -> None:
+    """
+    Start the Abogen Flet frontend as a web server.
+    """
+    import sys
+    if "--web" not in sys.argv:
+        sys.argv.insert(1, "--web")
+    main()
+
+
+if __name__ == "__main__":
+    main()

abogen/frontend/state/__init__.py

@@ -0,0 +1,4 @@
+"""State sub-package – exports AppState and ConversionJob."""
+from .app_state import AppState, ConversionJob
+
+__all__ = ["AppState", "ConversionJob"]

abogen/frontend/state/app_state.py

@@ -0,0 +1,451 @@
+"""
+Centralized, per-session application state for the Abogen Flet frontend.
+
+Each Flet page (session) gets its own instance of AppState, which guarantees
+complete isolation between simultaneous web-browser clients and the desktop
+window. The class carries every configuration variable, file buffer reference,
+and generation progress field that the rest of the UI reads or writes.
+
+This module intentionally has no Flet imports so it can be unit-tested without
+a running Flet server.
+"""
+
+from __future__ import annotations
+
+import threading
+from dataclasses import dataclass, field
+from pathlib import Path
+from typing import Any, Callable, Dict, List, Optional
+
+from abogen.utils import load_config, save_config
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+
+def _default_config() -> Dict[str, Any]:
+    """Load the persisted user config dict, returning an empty dict on failure."""
+    try:
+        return load_config() or {}
+    except Exception:
+        return {}
+
+
+# ---------------------------------------------------------------------------
+# Per-session state
+# ---------------------------------------------------------------------------
+
+
+@dataclass
+class ConversionJob:
+    """Lightweight descriptor of a single queued conversion job."""
+
+    file_path: str
+    """Absolute path to the text/epub/pdf/txt input file."""
+
+    display_name: str
+    """User-visible filename (may be the original epub/pdf path)."""
+
+    voice: str
+    """Voice formula string (e.g. 'af_heart' or 'af_heart*0.5+am_adam*0.5')."""
+
+    lang_code: str
+    """Single-char language prefix used by Kokoro (e.g. 'a', 'b', 'e')."""
+
+    speed: float = 1.0
+    """Playback speed multiplier, range 0.1 – 2.0."""
+
+    output_format: str = "mp3"
+    """Output audio container format."""
+
+    subtitle_mode: str = "Disabled"
+    """Subtitle generation mode."""
+
+    save_option: str = "Save next to input file"
+    """Save location strategy."""
+
+    output_folder: Optional[str] = None
+    """Absolute path when save_option is 'Choose output folder'."""
+
+    char_count: int = 0
+    """Pre-computed character count for ETR estimation."""
+
+    replace_single_newlines: bool = True
+    save_chapters_separately: Optional[bool] = None
+    merge_chapters_at_end: Optional[bool] = None
+
+
+@dataclass
+class AppState:
+    """
+    Single source of truth for one Flet session.
+
+    Instantiated once per ``ft.app()`` call on desktop, and once per browser
+    tab on web.  All UI components receive a reference to this object and
+    read/write it to keep themselves in sync.
+
+    Thread-safety: mutation from background threads should be done via the
+    provided ``_lock``.  The UI update callbacks (``on_log``,
+    ``on_progress``, etc.) are always invoked on the Flet event loop via
+    ``page.run_task()`` and must be set by the view layer.
+    """
+
+    # -----------------------------------------------------------------------
+    # Runtime identity
+    # -----------------------------------------------------------------------
+    _lock: threading.Lock = field(default_factory=threading.Lock, repr=False, compare=False)
+
+    # -----------------------------------------------------------------------
+    # Persisted user config (loaded once, written on every change)
+    # -----------------------------------------------------------------------
+    config: Dict[str, Any] = field(default_factory=_default_config)
+
+    # -----------------------------------------------------------------------
+    # File / input state
+    # -----------------------------------------------------------------------
+    selected_file: Optional[str] = None
+    """Path to the processed text file (may be a temp cache copy for epub/pdf)."""
+
+    selected_file_type: Optional[str] = None
+    """'txt' | 'epub' | 'pdf' | 'markdown' | None"""
+
+    selected_book_path: Optional[str] = None
+    """Original epub/pdf path before being converted to txt."""
+
+    displayed_file_path: Optional[str] = None
+    """Path shown in the UI drop-zone (original book or txt file)."""
+
+    selected_chapters: List[str] = field(default_factory=list)
+    """Ordered list of selected chapter href tokens (or page numbers for PDFs)."""
+
+    save_chapters_separately: Optional[bool] = None
+    merge_chapters_at_end: Optional[bool] = None
+    save_as_project: bool = False
+    char_count: int = 0
+
+    # -----------------------------------------------------------------------
+    # Voice / language
+    # -----------------------------------------------------------------------
+    selected_voice: str = "af_heart"
+    selected_lang: str = "a"
+    selected_profile_name: Optional[str] = None
+    mixed_voice_state: Optional[List[Any]] = None
+    """List of [voice_id, weight] pairs when the formula mixer is in use."""
+
+    # -----------------------------------------------------------------------
+    # Conversion parameters
+    # -----------------------------------------------------------------------
+    speed: float = 1.0
+    use_gpu: bool = True
+    selected_format: str = "wav"
+    subtitle_mode: str = "Sentence"
+    subtitle_format: str = "ass_centered_narrow"
+    replace_single_newlines: bool = True
+    save_option: str = "Save next to input file"
+    selected_output_folder: Optional[str] = None
+    silence_duration: float = 2.0
+    max_subtitle_words: int = 50
+    separate_chapters_format: str = "wav"
+    use_silent_gaps: bool = True
+    subtitle_speed_method: str = "tts"
+    use_spacy_segmentation: bool = True
+    chunk_level: str = "paragraph"
+    generate_epub3: bool = False
+
+    # TTS provider
+    tts_provider: str = "kokoro"
+    supertonic_total_steps: int = 5
+
+    # Chapter options
+    chapter_intro_delay: float = 0.5
+    read_title_intro: bool = False
+    read_closing_outro: bool = True
+    auto_prefix_chapter_titles: bool = True
+    normalize_chapter_opening_caps: bool = True
+
+    # Speaker analysis
+    speaker_analysis_threshold: int = 3
+
+    # Word substitutions
+    word_substitutions_enabled: bool = False
+    word_substitutions_list: str = ""
+    case_sensitive_substitutions: bool = False
+    replace_all_caps: bool = False
+    replace_numerals: bool = False
+    fix_nonstandard_punctuation: bool = False
+
+    # -----------------------------------------------------------------------
+    # Conversion runtime state
+    # -----------------------------------------------------------------------
+    is_converting: bool = False
+    is_cancelled: bool = False
+    progress: float = 0.0
+    """Fractional progress 0.0 – 1.0."""
+    etr_seconds: Optional[float] = None
+    """Estimated seconds remaining, or None if unknown."""
+    last_output_path: Optional[str] = None
+    log_lines: List[str] = field(default_factory=list)
+    """Buffered log messages, capped at LOG_MAX_LINES."""
+
+    LOG_MAX_LINES: int = 2000
+
+    # -----------------------------------------------------------------------
+    # Queue
+    # -----------------------------------------------------------------------
+    queued_items: List[ConversionJob] = field(default_factory=list)
+    current_queue_index: int = 0
+
+    # -----------------------------------------------------------------------
+    # Callbacks (set by the view layer, not serialised)
+    # -----------------------------------------------------------------------
+    on_log: Optional[Callable[[str, str], None]] = field(default=None, repr=False, compare=False)
+    """Called from any thread: ``on_log(message, level)``."""
+
+    on_progress: Optional[Callable[[float, Optional[float]], None]] = field(
+        default=None, repr=False, compare=False
+    )
+    """Called from any thread: ``on_progress(fraction, etr_seconds)``."""
+
+    on_conversion_finished: Optional[Callable[[str, Optional[str]], None]] = field(
+        default=None, repr=False, compare=False
+    )
+    """Called from any thread: ``on_conversion_finished(message, output_path)``."""
+
+    # -----------------------------------------------------------------------
+    # Integrations
+    # -----------------------------------------------------------------------
+    audiobookshelf_enabled: bool = False
+    audiobookshelf_base_url: str = ""
+    audiobookshelf_api_token: str = ""
+    audiobookshelf_library_id: str = ""
+    audiobookshelf_folder_id: str = ""
+    audiobookshelf_verify_ssl: bool = True
+    audiobookshelf_auto_send: bool = False
+    audiobookshelf_send_cover: bool = True
+    audiobookshelf_send_chapters: bool = True
+    audiobookshelf_send_subtitles: bool = False
+    audiobookshelf_timeout: float = 30.0
+
+    calibre_opds_enabled: bool = False
+    calibre_opds_base_url: str = ""
+    calibre_opds_username: str = ""
+    calibre_opds_password: str = ""
+    calibre_opds_verify_ssl: bool = True
+
+    # -----------------------------------------------------------------------
+    # Public helpers
+    # -----------------------------------------------------------------------
+
+    def load_from_config(self) -> None:
+        """
+        Populate all fields from the persisted JSON config file.
+
+        Called once at startup and whenever the settings page is saved.
+        Thread-safe.
+        """
+        with self._lock:
+            cfg = _default_config()
+            self.config = cfg
+
+            self.selected_voice = cfg.get("selected_voice", "af_heart")
+            self.selected_lang = self.selected_voice[0] if self.selected_voice else "a"
+            self.selected_profile_name = cfg.get("selected_profile_name")
+            self.speed = cfg.get("speed", 1.0)
+            self.use_gpu = cfg.get("use_gpu", True)
+            self.selected_format = cfg.get("selected_format", "wav")
+            self.subtitle_mode = cfg.get("subtitle_mode", "Sentence")
+            self.subtitle_format = cfg.get("subtitle_format", "ass_centered_narrow")
+            self.replace_single_newlines = cfg.get("replace_single_newlines", True)
+            self.save_option = cfg.get("save_option", "Save next to input file")
+            self.selected_output_folder = cfg.get("selected_output_folder")
+            self.silence_duration = cfg.get("silence_duration", 2.0)
+            self.max_subtitle_words = cfg.get("max_subtitle_words", 50)
+            self.separate_chapters_format = cfg.get("separate_chapters_format", "wav")
+            self.use_silent_gaps = cfg.get("use_silent_gaps", True)
+            self.subtitle_speed_method = cfg.get("subtitle_speed_method", "tts")
+            self.use_spacy_segmentation = cfg.get("use_spacy_segmentation", True)
+            self.chunk_level = cfg.get("chunk_level", "paragraph")
+            self.generate_epub3 = cfg.get("generate_epub3", False)
+            self.tts_provider = cfg.get("tts_provider", "kokoro")
+            self.supertonic_total_steps = cfg.get("supertonic_total_steps", 5)
+            self.chapter_intro_delay = cfg.get("chapter_intro_delay", 0.5)
+            self.read_title_intro = cfg.get("read_title_intro", False)
+            self.read_closing_outro = cfg.get("read_closing_outro", True)
+            self.auto_prefix_chapter_titles = cfg.get("auto_prefix_chapter_titles", True)
+            self.normalize_chapter_opening_caps = cfg.get("normalize_chapter_opening_caps", True)
+            self.speaker_analysis_threshold = cfg.get("speaker_analysis_threshold", 3)
+            self.word_substitutions_enabled = cfg.get("word_substitutions_enabled", False)
+            self.word_substitutions_list = cfg.get("word_substitutions_list", "")
+            self.case_sensitive_substitutions = cfg.get("case_sensitive_substitutions", False)
+            self.replace_all_caps = cfg.get("replace_all_caps", False)
+            self.replace_numerals = cfg.get("replace_numerals", False)
+            self.fix_nonstandard_punctuation = cfg.get("fix_nonstandard_punctuation", False)
+
+            # Integrations
+            integrations: Dict[str, Any] = cfg.get("integrations", {})
+            abs_cfg = integrations.get("audiobookshelf", {})
+            self.audiobookshelf_enabled = bool(abs_cfg.get("enabled", False))
+            self.audiobookshelf_base_url = str(abs_cfg.get("base_url", ""))
+            self.audiobookshelf_api_token = str(abs_cfg.get("api_token", ""))
+            self.audiobookshelf_library_id = str(abs_cfg.get("library_id", ""))
+            self.audiobookshelf_folder_id = str(abs_cfg.get("folder_id", ""))
+            self.audiobookshelf_verify_ssl = bool(abs_cfg.get("verify_ssl", True))
+            self.audiobookshelf_auto_send = bool(abs_cfg.get("auto_send", False))
+            self.audiobookshelf_send_cover = bool(abs_cfg.get("send_cover", True))
+            self.audiobookshelf_send_chapters = bool(abs_cfg.get("send_chapters", True))
+            self.audiobookshelf_send_subtitles = bool(abs_cfg.get("send_subtitles", False))
+            self.audiobookshelf_timeout = float(abs_cfg.get("timeout", 30.0))
+
+            cal_cfg = integrations.get("calibre_opds", {})
+            self.calibre_opds_enabled = bool(cal_cfg.get("enabled", False))
+            self.calibre_opds_base_url = str(cal_cfg.get("base_url", ""))
+            self.calibre_opds_username = str(cal_cfg.get("username", ""))
+            self.calibre_opds_password = str(cal_cfg.get("password", ""))
+            self.calibre_opds_verify_ssl = bool(cal_cfg.get("verify_ssl", True))
+
+    def persist_config(self) -> None:
+        """
+        Write the current config snapshot back to disk.
+
+        Only the fields that map to the JSON config are written; runtime state
+        (progress, log_lines, callbacks) is not persisted.
+        Thread-safe.
+        """
+        with self._lock:
+            cfg = self.config.copy()
+            cfg["selected_voice"] = self.selected_voice
+            cfg["selected_profile_name"] = self.selected_profile_name
+            cfg["speed"] = self.speed
+            cfg["use_gpu"] = self.use_gpu
+            cfg["selected_format"] = self.selected_format
+            cfg["subtitle_mode"] = self.subtitle_mode
+            cfg["subtitle_format"] = self.subtitle_format
+            cfg["replace_single_newlines"] = self.replace_single_newlines
+            cfg["save_option"] = self.save_option
+            cfg["selected_output_folder"] = self.selected_output_folder
+            cfg["silence_duration"] = self.silence_duration
+            cfg["max_subtitle_words"] = self.max_subtitle_words
+            cfg["separate_chapters_format"] = self.separate_chapters_format
+            cfg["use_silent_gaps"] = self.use_silent_gaps
+            cfg["subtitle_speed_method"] = self.subtitle_speed_method
+            cfg["use_spacy_segmentation"] = self.use_spacy_segmentation
+            cfg["chunk_level"] = self.chunk_level
+            cfg["generate_epub3"] = self.generate_epub3
+            cfg["tts_provider"] = self.tts_provider
+            cfg["supertonic_total_steps"] = self.supertonic_total_steps
+            cfg["chapter_intro_delay"] = self.chapter_intro_delay
+            cfg["read_title_intro"] = self.read_title_intro
+            cfg["read_closing_outro"] = self.read_closing_outro
+            cfg["auto_prefix_chapter_titles"] = self.auto_prefix_chapter_titles
+            cfg["normalize_chapter_opening_caps"] = self.normalize_chapter_opening_caps
+            cfg["speaker_analysis_threshold"] = self.speaker_analysis_threshold
+            cfg["word_substitutions_enabled"] = self.word_substitutions_enabled
+            cfg["word_substitutions_list"] = self.word_substitutions_list
+            cfg["case_sensitive_substitutions"] = self.case_sensitive_substitutions
+            cfg["replace_all_caps"] = self.replace_all_caps
+            cfg["replace_numerals"] = self.replace_numerals
+            cfg["fix_nonstandard_punctuation"] = self.fix_nonstandard_punctuation
+            # Integrations
+            cfg.setdefault("integrations", {})
+            cfg["integrations"]["audiobookshelf"] = {
+                "enabled": self.audiobookshelf_enabled,
+                "base_url": self.audiobookshelf_base_url,
+                "api_token": self.audiobookshelf_api_token,
+                "library_id": self.audiobookshelf_library_id,
+                "folder_id": self.audiobookshelf_folder_id,
+                "verify_ssl": self.audiobookshelf_verify_ssl,
+                "auto_send": self.audiobookshelf_auto_send,
+                "send_cover": self.audiobookshelf_send_cover,
+                "send_chapters": self.audiobookshelf_send_chapters,
+                "send_subtitles": self.audiobookshelf_send_subtitles,
+                "timeout": self.audiobookshelf_timeout,
+            }
+            cfg["integrations"]["calibre_opds"] = {
+                "enabled": self.calibre_opds_enabled,
+                "base_url": self.calibre_opds_base_url,
+                "username": self.calibre_opds_username,
+                "password": self.calibre_opds_password,
+                "verify_ssl": self.calibre_opds_verify_ssl,
+            }
+            self.config = cfg
+            try:
+                save_config(cfg)
+            except Exception:
+                pass
+
+    def append_log(self, message: str, level: str = "info") -> None:
+        """
+        Thread-safely append a log line and trigger the UI callback.
+
+        Caps the internal buffer at ``LOG_MAX_LINES`` to prevent unbounded
+        memory growth during very long conversion tasks.
+        """
+        with self._lock:
+            self.log_lines.append(f"[{level.upper()}] {message}")
+            if len(self.log_lines) > self.LOG_MAX_LINES:
+                # Trim oldest 10 % to amortise the cost of trimming
+                trim = self.LOG_MAX_LINES // 10
+                self.log_lines = self.log_lines[trim:]
+
+        cb = self.on_log
+        if cb is not None:
+            try:
+                cb(message, level)
+            except Exception:
+                pass
+
+    def update_progress(self, fraction: float, etr: Optional[float] = None) -> None:
+        """
+        Update fractional progress and ETR, then notify the UI callback.
+
+        Args:
+            fraction: Value in [0.0, 1.0].
+            etr: Estimated seconds remaining, or None.
+        """
+        with self._lock:
+            self.progress = max(0.0, min(1.0, fraction))
+            self.etr_seconds = etr
+
+        cb = self.on_progress
+        if cb is not None:
+            try:
+                cb(fraction, etr)
+            except Exception:
+                pass
+
+    def get_voice_formula(self) -> str:
+        """
+        Return the effective voice formula string.
+
+        Uses the mixed_voice_state if the formula mixer is active, otherwise
+        returns the raw selected_voice.
+        """
+        if self.mixed_voice_state:
+            parts = [f"{name}*{weight}" for name, weight in self.mixed_voice_state]
+            return " + ".join(filter(None, parts))
+        return self.selected_voice or "af_heart"
+
+    def reset_file_state(self) -> None:
+        """Clear all file-related fields without touching voice/settings."""
+        with self._lock:
+            self.selected_file = None
+            self.selected_file_type = None
+            self.selected_book_path = None
+            self.displayed_file_path = None
+            self.selected_chapters = []
+            self.save_chapters_separately = None
+            self.merge_chapters_at_end = None
+            self.save_as_project = False
+            self.char_count = 0
+
+    def reset_conversion_state(self) -> None:
+        """Clear all runtime conversion fields to start fresh."""
+        with self._lock:
+            self.is_converting = False
+            self.is_cancelled = False
+            self.progress = 0.0
+            self.etr_seconds = None
+            self.last_output_path = None
+            self.log_lines = []

abogen/frontend/utils/__init__.py

@@ -0,0 +1,38 @@
+"""Utils sub-package."""
+from .helpers import (
+    human_readable_size,
+    format_duration,
+    format_etr,
+    detect_file_type,
+    is_supported_file,
+    is_book_type,
+    voice_lang_code,
+    language_label,
+    grouped_voices,
+    voice_display_name,
+    parse_voice_formula,
+    format_number,
+    safe_basename,
+    output_format_label,
+    subtitle_format_label,
+    SUPPORTED_EXTENSIONS,
+)
+
+__all__ = [
+    "human_readable_size",
+    "format_duration",
+    "format_etr",
+    "detect_file_type",
+    "is_supported_file",
+    "is_book_type",
+    "voice_lang_code",
+    "language_label",
+    "grouped_voices",
+    "voice_display_name",
+    "parse_voice_formula",
+    "format_number",
+    "safe_basename",
+    "output_format_label",
+    "subtitle_format_label",
+    "SUPPORTED_EXTENSIONS",
+]

abogen/frontend/utils/conversion_bridge.py

@@ -0,0 +1,462 @@
+"""
+Background conversion bridge for the Abogen Flet frontend.
+
+This module wraps the existing ``abogen.webui.conversion_runner`` (and its
+``ConversionService`` / ``Job`` machinery) in an async-friendly interface that
+can push real-time progress and log updates back to the Flet event loop without
+blocking the UI thread.
+
+Key design decisions
+--------------------
+* All heavy work is offloaded to daemon threads. The Flet page event loop
+  is never blocked.
+* Progress and log callbacks are scheduled back onto the Flet page via
+  ``page.run_task()`` so Flet's session isolation remains intact.
+* Cancellation is cooperative: the underlying job's ``cancel_requested``
+  flag is set, and the runner checks it at chunk boundaries.
+* The module is a pure adapter – it does NOT duplicate any processing logic
+  from the core pipeline.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import os
+import tempfile
+import threading
+import time
+import traceback
+from pathlib import Path
+from typing import Any, Callable, Dict, List, Optional
+
+import flet as ft
+
+from abogen.utils import (
+    get_gpu_acceleration,
+    get_user_cache_path,
+    get_user_output_path,
+    load_numpy_kpipeline,
+    prevent_sleep_end,
+    prevent_sleep_start,
+)
+from abogen.webui.service import (
+    ConversionService,
+    Job,
+    JobStatus,
+    PendingJob,
+    build_service,
+)
+from abogen.webui.conversion_runner import run_conversion_job
+
+from ..state import AppState
+
+# ---------------------------------------------------------------------------
+# Module-level singleton ConversionService (shared across sessions, as in the
+# web UI – but each job carries its own output folder keyed by session).
+# ---------------------------------------------------------------------------
+
+_SERVICE_LOCK = threading.Lock()
+_SERVICE: Optional[ConversionService] = None
+
+
+def _get_service() -> ConversionService:
+    """
+    Return (creating if necessary) the module-level ConversionService.
+
+    The service manages the background worker thread and persistent job state.
+    Thread-safe via a module-level lock.
+    """
+    global _SERVICE
+    with _SERVICE_LOCK:
+        if _SERVICE is None:
+            output_root = Path(get_user_output_path("frontend"))
+            uploads_root = Path(get_user_cache_path("frontend/uploads"))
+            _SERVICE = build_service(
+                runner=run_conversion_job,
+                output_root=output_root,
+                uploads_root=uploads_root,
+            )
+    return _SERVICE
+
+
+# ---------------------------------------------------------------------------
+# Public conversion bridge
+# ---------------------------------------------------------------------------
+
+
+class ConversionBridge:
+    """
+    Thin adapter between the Flet UI session and the core conversion pipeline.
+
+    One ``ConversionBridge`` instance is created per Flet page (session) and
+    is responsible for:
+    1. Accepting a conversion request from the UI.
+    2. Writing the input text to a temp file if needed.
+    3. Submitting the job to ``ConversionService``.
+    4. Polling the job from a daemon thread and forwarding progress/logs to
+       the Flet page via ``page.run_task()``.
+    5. Providing a ``cancel()`` method that sets the cooperative flag.
+    """
+
+    def __init__(self, page: ft.Page, state: AppState) -> None:
+        """
+        Initialise the bridge.
+
+        Args:
+            page: The Flet ``Page`` for this session. Used to schedule
+                  UI callbacks on the correct event loop.
+            state: The session's ``AppState`` instance.
+        """
+        self._page = page
+        self._state = state
+        self._current_job: Optional[Job] = None
+        self._poll_thread: Optional[threading.Thread] = None
+        self._stop_poll = threading.Event()
+        self._seen_log_count = 0
+
+    # ------------------------------------------------------------------
+    # Public API
+    # ------------------------------------------------------------------
+
+    def start(
+        self,
+        *,
+        input_file: str,
+        voice: str,
+        lang_code: str,
+        speed: float,
+        output_format: str,
+        subtitle_mode: str,
+        subtitle_format: str,
+        use_gpu: bool,
+        save_option: str,
+        output_folder: Optional[str],
+        replace_single_newlines: bool,
+        char_count: int,
+        chapters: Optional[List[Dict[str, Any]]] = None,
+        save_chapters_separately: bool = False,
+        merge_chapters_at_end: bool = True,
+        separate_chapters_format: str = "wav",
+        silence_between_chapters: float = 2.0,
+        max_subtitle_words: int = 50,
+        chapter_intro_delay: float = 0.5,
+        read_title_intro: bool = False,
+        read_closing_outro: bool = True,
+        auto_prefix_chapter_titles: bool = True,
+        normalize_chapter_opening_caps: bool = True,
+        tts_provider: str = "kokoro",
+        supertonic_total_steps: int = 5,
+        chunk_level: str = "paragraph",
+        generate_epub3: bool = False,
+        word_substitutions_enabled: bool = False,
+        word_substitutions_list: str = "",
+        case_sensitive_substitutions: bool = False,
+        replace_all_caps: bool = False,
+        replace_numerals: bool = False,
+        fix_nonstandard_punctuation: bool = False,
+    ) -> None:
+        """
+        Submit a conversion job and begin the progress-polling loop.
+
+        This method returns immediately; all heavy work runs on daemon threads.
+        UI callbacks (``state.on_log``, ``state.on_progress``,
+        ``state.on_conversion_finished``) are scheduled on the Flet event loop.
+
+        Args:
+            input_file: Absolute path to the text/epub/pdf input file.
+            voice: Kokoro voice formula string.
+            lang_code: Single-char language code.
+            speed: Playback speed multiplier (0.1 – 2.0).
+            output_format: Audio container key (``'wav'``, ``'mp3'``, …).
+            subtitle_mode: Subtitle generation mode string.
+            subtitle_format: Subtitle container key (``'srt'``, ``'ass_wide'``, …).
+            use_gpu: Whether to request GPU acceleration.
+            save_option: Save-location strategy string.
+            output_folder: Explicit output folder or None.
+            replace_single_newlines: Pre-processing flag.
+            char_count: Pre-computed character count for ETR estimation.
+            chapters: Optional list of chapter dicts for epub/pdf.
+            save_chapters_separately: Split chapters into separate files.
+            merge_chapters_at_end: Merge chapter files into one after generation.
+            separate_chapters_format: Format for individual chapter files.
+            silence_between_chapters: Silence gap (seconds) between chapters.
+            max_subtitle_words: Maximum words per subtitle block.
+            chapter_intro_delay: Silence before chapter title announcement (s).
+            read_title_intro: Announce book title at the start.
+            read_closing_outro: Announce book title at the end.
+            auto_prefix_chapter_titles: Prepend "Chapter N." to titles.
+            normalize_chapter_opening_caps: Fix ALL-CAPS opening lines.
+            tts_provider: ``'kokoro'`` or ``'supertonic'``.
+            supertonic_total_steps: Quality steps for the Supertonic pipeline.
+            chunk_level: ``'paragraph'`` or ``'sentence'`` chunking granularity.
+            generate_epub3: Also produce an EPUB3 audiobook package.
+            word_substitutions_enabled: Toggle word-substitution pre-processing.
+            word_substitutions_list: Newline-delimited ``word|replacement`` rules.
+            case_sensitive_substitutions: Case-sensitive matching for substitutions.
+            replace_all_caps: Lowercase ALL-CAPS words.
+            replace_numerals: Convert digits to spoken words.
+            fix_nonstandard_punctuation: Normalise curly quotes etc.
+        """
+        if self._state.is_converting:
+            return
+
+        # Resolve the effective output folder
+        resolved_output: Optional[Path] = self._resolve_output_folder(
+            save_option=save_option,
+            output_folder=output_folder,
+            input_file=input_file,
+        )
+
+        # Store the input file as a Path
+        stored_path = Path(input_file)
+        original_filename = stored_path.name
+
+        # Block signals until the job is submitted
+        prevent_sleep_start()
+        self._state.is_converting = True
+        self._state.is_cancelled = False
+        self._state.progress = 0.0
+        self._state.etr_seconds = None
+        self._state.log_lines = []
+        self._seen_log_count = 0
+
+        # Enqueue the job on the service
+        service = _get_service()
+        job = service.enqueue(
+            original_filename=original_filename,
+            stored_path=stored_path,
+            language=lang_code,
+            voice=voice,
+            speed=speed,
+            tts_provider=tts_provider,
+            supertonic_total_steps=supertonic_total_steps,
+            use_gpu=use_gpu,
+            subtitle_mode=subtitle_mode,
+            output_format=output_format,
+            save_mode=self._save_mode_key(save_option),
+            output_folder=resolved_output,
+            replace_single_newlines=replace_single_newlines,
+            subtitle_format=subtitle_format,
+            total_characters=char_count,
+            chapters=chapters or [],
+            save_chapters_separately=save_chapters_separately,
+            merge_chapters_at_end=merge_chapters_at_end,
+            separate_chapters_format=separate_chapters_format,
+            silence_between_chapters=silence_between_chapters,
+            max_subtitle_words=max_subtitle_words,
+            chapter_intro_delay=chapter_intro_delay,
+            read_title_intro=read_title_intro,
+            read_closing_outro=read_closing_outro,
+            auto_prefix_chapter_titles=auto_prefix_chapter_titles,
+            normalize_chapter_opening_caps=normalize_chapter_opening_caps,
+            chunk_level=chunk_level,
+            generate_epub3=generate_epub3,
+        )
+        self._current_job = job
+
+        # Persist word-substitution settings to config so the runner picks them up
+        self._state.word_substitutions_enabled = word_substitutions_enabled
+        self._state.word_substitutions_list = word_substitutions_list
+        self._state.case_sensitive_substitutions = case_sensitive_substitutions
+        self._state.replace_all_caps = replace_all_caps
+        self._state.replace_numerals = replace_numerals
+        self._state.fix_nonstandard_punctuation = fix_nonstandard_punctuation
+        self._state.persist_config()
+
+        # Start the poll thread
+        self._stop_poll.clear()
+        self._poll_thread = threading.Thread(
+            target=self._poll_job_loop, daemon=True, name="abogen-poll"
+        )
+        self._poll_thread.start()
+
+    def cancel(self) -> None:
+        """
+        Request cancellation of the currently running job.
+
+        Sets the cooperative flag on the underlying ``Job`` object; the runner
+        will stop after completing the current text chunk.
+        """
+        if self._current_job is not None:
+            self._state.is_cancelled = True
+            try:
+                _get_service().cancel(self._current_job.id)
+            except Exception:
+                pass
+
+    # ------------------------------------------------------------------
+    # Internal helpers
+    # ------------------------------------------------------------------
+
+    @staticmethod
+    def _save_mode_key(option: str) -> str:
+        """
+        Convert the human-readable save option to the service's internal key.
+
+        Args:
+            option: UI-facing string (``'Save next to input file'``, …).
+
+        Returns:
+            Service key string.
+        """
+        mapping = {
+            "Save next to input file": "save_next_to_input",
+            "Save to Desktop": "save_to_desktop",
+            "Choose output folder": "custom",
+        }
+        return mapping.get(option, "save_next_to_input")
+
+    @staticmethod
+    def _resolve_output_folder(
+        save_option: str,
+        output_folder: Optional[str],
+        input_file: str,
+    ) -> Optional[Path]:
+        """
+        Return the output ``Path`` based on the save option, or None for
+        the "next to input" strategy (the runner handles that internally).
+
+        Args:
+            save_option: UI-facing save strategy string.
+            output_folder: Explicit path when ``save_option`` is ``'Choose output folder'``.
+            input_file: Path to the source file for the ``'Save to Desktop'`` strategy.
+
+        Returns:
+            Resolved ``Path`` or ``None``.
+        """
+        if save_option == "Choose output folder" and output_folder:
+            p = Path(output_folder)
+            p.mkdir(parents=True, exist_ok=True)
+            return p
+        if save_option == "Save to Desktop":
+            desktop = Path.home() / "Desktop"
+            desktop.mkdir(exist_ok=True)
+            return desktop
+        # "Save next to input file" – let the runner decide
+        return None
+
+    def _poll_job_loop(self) -> None:
+        """
+        Background daemon loop that polls the current Job for updates.
+
+        Runs until the job enters a terminal state or until ``_stop_poll``
+        is set.  Uses ``page.run_task()`` to schedule UI updates on the Flet
+        event loop without triggering thread-safety violations.
+        """
+        job = self._current_job
+        if job is None:
+            return
+
+        service = _get_service()
+        POLL_INTERVAL = 0.25  # seconds
+
+        while not self._stop_poll.is_set():
+            # Re-fetch the current job state (it's mutated in-place by the runner)
+            current = service.get_job(job.id)
+            if current is None:
+                break
+
+            # Forward new log lines
+            new_logs = current.logs[self._seen_log_count:]
+            self._seen_log_count += len(new_logs)
+            for log_entry in new_logs:
+                level = getattr(log_entry, "level", "info")
+                message = getattr(log_entry, "message", str(log_entry))
+                self._schedule_log(message, level)
+
+            # Forward progress
+            if current.progress is not None:
+                etr = getattr(current, "estimated_time_remaining", None)
+                self._schedule_progress(float(current.progress), etr)
+
+            # Check for terminal states
+            status = current.status
+            if status in (
+                JobStatus.COMPLETED,
+                JobStatus.FAILED,
+                JobStatus.CANCELLED,
+            ):
+                output_path: Optional[str] = None
+                if current.result and current.result.audio_path:
+                    output_path = str(current.result.audio_path)
+                if status == JobStatus.COMPLETED:
+                    finish_msg = "Conversion completed successfully."
+                elif status == JobStatus.CANCELLED:
+                    finish_msg = "Cancelled"
+                else:
+                    finish_msg = f"Conversion failed: {current.error or 'Unknown error'}"
+
+                self._schedule_finished(finish_msg, output_path)
+                break
+
+            time.sleep(POLL_INTERVAL)
+
+        prevent_sleep_end()
+        self._state.is_converting = False
+
+    def _schedule_log(self, message: str, level: str) -> None:
+        """Schedule a log update on the Flet event loop."""
+        state = self._state
+        page = self._page
+        state.append_log(message, level)
+
+        async def _update() -> None:
+            cb = state.on_log
+            if cb:
+                cb(message, level)
+            try:
+                page.update()
+            except Exception:
+                pass
+
+        try:
+            page.run_task(_update)
+        except Exception:
+            pass
+
+    def _schedule_progress(self, fraction: float, etr: Optional[float]) -> None:
+        """Schedule a progress update on the Flet event loop."""
+        state = self._state
+        page = self._page
+        state.progress = max(0.0, min(1.0, fraction))
+        state.etr_seconds = etr
+
+        async def _update() -> None:
+            cb = state.on_progress
+            if cb:
+                cb(fraction, etr)
+            try:
+                page.update()
+            except Exception:
+                pass
+
+        try:
+            page.run_task(_update)
+        except Exception:
+            pass
+
+    def _schedule_finished(
+        self, message: str, output_path: Optional[str]
+    ) -> None:
+        """Schedule a completion notification on the Flet event loop."""
+        state = self._state
+        page = self._page
+        state.last_output_path = output_path
+        self._stop_poll.set()
+
+        async def _update() -> None:
+            state.is_converting = False
+            state.progress = 1.0
+            state.last_output_path = output_path
+            cb = state.on_conversion_finished
+            if cb:
+                cb(message, output_path)
+            try:
+                page.update()
+            except Exception:
+                pass
+
+        try:
+            page.run_task(_update)
+        except Exception:
+            pass

abogen/frontend/utils/helpers.py

@@ -0,0 +1,313 @@
+"""
+Frontend-specific utilities for the Abogen Flet application.
+
+Contains helpers for:
+- Human-readable size / duration formatting
+- Voice formula parsing and display
+- File-type detection
+- ETR (Estimated Time Remaining) formatting
+- Path resolution that adapts to desktop vs. web context
+"""
+
+from __future__ import annotations
+
+import os
+import re
+from pathlib import Path
+from typing import List, Optional, Tuple
+
+from abogen.constants import (
+    LANGUAGE_DESCRIPTIONS,
+    SUPPORTED_INPUT_FORMATS,
+    SUPPORTED_SOUND_FORMATS,
+    SUBTITLE_FORMATS,
+    VOICES_INTERNAL,
+)
+
+
+# ---------------------------------------------------------------------------
+# Size / duration helpers
+# ---------------------------------------------------------------------------
+
+
+def human_readable_size(size_bytes: int, decimal_places: int = 2) -> str:
+    """
+    Convert a byte count into a human-readable string.
+
+    Args:
+        size_bytes: Number of bytes.
+        decimal_places: Significant decimal digits in the output.
+
+    Returns:
+        A string like ``"3.14 MB"`` or ``"1.00 KB"``.
+    """
+    for unit in ("B", "KB", "MB", "GB", "TB"):
+        if size_bytes < 1024.0:
+            return f"{size_bytes:.{decimal_places}f} {unit}"
+        size_bytes /= 1024.0  # type: ignore[assignment]
+    return f"{size_bytes:.{decimal_places}f} PB"
+
+
+def format_duration(seconds: float) -> str:
+    """
+    Format a duration in seconds as ``HH:MM:SS``.
+
+    Args:
+        seconds: Non-negative floating-point duration.
+
+    Returns:
+        A colon-delimited time string, e.g. ``"00:03:42"``.
+    """
+    total = max(0, int(seconds))
+    h, remainder = divmod(total, 3600)
+    m, s = divmod(remainder, 60)
+    return f"{h:02d}:{m:02d}:{s:02d}"
+
+
+def format_etr(etr_seconds: Optional[float]) -> str:
+    """
+    Format an estimated time remaining value for the UI.
+
+    Args:
+        etr_seconds: Seconds remaining, or None when unknown.
+
+    Returns:
+        Human-readable string such as ``"~3 min 42 sec"`` or ``"Calculating…"``.
+    """
+    if etr_seconds is None:
+        return "Calculating…"
+    total = max(0, int(etr_seconds))
+    if total < 60:
+        return f"~{total} sec"
+    m, s = divmod(total, 60)
+    if m < 60:
+        return f"~{m} min {s} sec"
+    h, m = divmod(m, 60)
+    return f"~{h} h {m} min"
+
+
+# ---------------------------------------------------------------------------
+# File helpers
+# ---------------------------------------------------------------------------
+
+
+SUPPORTED_EXTENSIONS: Tuple[str, ...] = (
+    ".txt",
+    ".epub",
+    ".pdf",
+    ".md",
+    ".markdown",
+    ".srt",
+    ".ass",
+    ".vtt",
+)
+"""All file extensions that the drop-zone accepts."""
+
+
+def detect_file_type(file_path: str) -> str:
+    """
+    Return a normalised file-type token for the given path.
+
+    Args:
+        file_path: Absolute or relative path to the input file.
+
+    Returns:
+        One of ``'txt'``, ``'epub'``, ``'pdf'``, ``'markdown'``,
+        ``'subtitle'``, or ``'unknown'``.
+    """
+    ext = Path(file_path).suffix.lower()
+    if ext == ".epub":
+        return "epub"
+    if ext == ".pdf":
+        return "pdf"
+    if ext in (".md", ".markdown"):
+        return "markdown"
+    if ext in (".srt", ".ass", ".vtt"):
+        return "subtitle"
+    if ext == ".txt":
+        return "txt"
+    return "unknown"
+
+
+def is_supported_file(file_path: str) -> bool:
+    """
+    Return True when the file extension is in the supported set.
+
+    Args:
+        file_path: Path whose extension is inspected.
+    """
+    return Path(file_path).suffix.lower() in SUPPORTED_EXTENSIONS
+
+
+def is_book_type(file_type: str) -> bool:
+    """
+    Return True for file types that contain chapters / pages.
+
+    Args:
+        file_type: Token from ``detect_file_type()``.
+    """
+    return file_type in ("epub", "pdf", "markdown")
+
+
+# ---------------------------------------------------------------------------
+# Voice helpers
+# ---------------------------------------------------------------------------
+
+
+def voice_lang_code(voice: str) -> str:
+    """
+    Extract the language code character from a Kokoro voice name.
+
+    The first character of every internal voice name encodes the language
+    (e.g. ``'a'`` for American English, ``'b'`` for British English).
+
+    Args:
+        voice: Raw voice string like ``'af_heart'`` or a formula.
+
+    Returns:
+        Single lowercase character, defaulting to ``'a'`` on failure.
+    """
+    if not voice:
+        return "a"
+    # For plain voice IDs the first char is the language
+    if voice[0].isalpha() and "_" in voice[:4]:
+        return voice[0].lower()
+    # Formula: extract first alpha char
+    match = re.search(r"\b([a-z])", voice)
+    return match.group(1) if match else "a"
+
+
+def language_label(lang_code: str) -> str:
+    """
+    Return the human-readable label for a language code.
+
+    Args:
+        lang_code: Single-character code (``'a'``, ``'b'``, …).
+
+    Returns:
+        Display string, e.g. ``"American English"``.
+    """
+    return LANGUAGE_DESCRIPTIONS.get(lang_code, lang_code.upper())
+
+
+def grouped_voices() -> List[Tuple[str, List[str]]]:
+    """
+    Return the internal voice list grouped by language for display.
+
+    Returns:
+        List of ``(language_label, [voice_id, …])`` tuples.
+    """
+    groups: dict[str, List[str]] = {}
+    for v in VOICES_INTERNAL:
+        lang = language_label(v[0])
+        groups.setdefault(lang, []).append(v)
+    return sorted(groups.items())
+
+
+def voice_display_name(voice_id: str) -> str:
+    """
+    Convert a raw voice ID like ``'af_heart'`` to a prettier display name.
+
+    Args:
+        voice_id: Raw internal voice identifier.
+
+    Returns:
+        Formatted string, e.g. ``"af_heart"`` (unchanged; may be enhanced later).
+    """
+    return voice_id
+
+
+def parse_voice_formula(formula: str) -> List[Tuple[str, float]]:
+    """
+    Parse a Kokoro voice mix formula into a list of ``(voice_id, weight)`` tuples.
+
+    Example:
+        ``"af_heart*0.7+am_adam*0.3"`` → ``[('af_heart', 0.7), ('am_adam', 0.3)]``
+
+    Args:
+        formula: Space- or ``+``-joined mix formula string.
+
+    Returns:
+        Parsed list; empty if parsing fails.
+    """
+    parts: List[Tuple[str, float]] = []
+    for token in re.split(r"[+\s]+", formula.strip()):
+        token = token.strip()
+        if not token:
+            continue
+        if "*" in token:
+            name, _, weight_str = token.partition("*")
+            try:
+                parts.append((name.strip(), float(weight_str.strip())))
+            except ValueError:
+                pass
+        else:
+            # Bare voice id — assume full weight
+            if token in VOICES_INTERNAL:
+                parts.append((token, 1.0))
+    return parts
+
+
+# ---------------------------------------------------------------------------
+# Number formatting
+# ---------------------------------------------------------------------------
+
+
+def format_number(n: int) -> str:
+    """
+    Format an integer with thousands separators.
+
+    Args:
+        n: Integer value.
+
+    Returns:
+        Formatted string, e.g. ``"1,234,567"``.
+    """
+    return f"{n:,}"
+
+
+# ---------------------------------------------------------------------------
+# Path helpers
+# ---------------------------------------------------------------------------
+
+
+def safe_basename(path: Optional[str]) -> str:
+    """
+    Return the basename of a path, or an empty string when path is None/empty.
+
+    Args:
+        path: Optional file-system path.
+    """
+    if not path:
+        return ""
+    return os.path.basename(path)
+
+
+def output_format_label(fmt: str) -> str:
+    """
+    Return a display label for an audio output format key.
+
+    Args:
+        fmt: Lowercase format key (``'wav'``, ``'mp3'``, …).
+    """
+    labels = {
+        "wav": "WAV (lossless)",
+        "flac": "FLAC (lossless compressed)",
+        "mp3": "MP3",
+        "opus": "Opus (best compression)",
+        "m4b": "M4B (with chapters)",
+    }
+    return labels.get(fmt, fmt.upper())
+
+
+def subtitle_format_label(key: str) -> str:
+    """
+    Return the display label for a subtitle format key.
+
+    Args:
+        key: Internal subtitle format key (e.g. ``'ass_centered_narrow'``).
+    """
+    for k, label in SUBTITLE_FORMATS:
+        if k == key:
+            return label
+    return key

abogen/frontend/utils/theme.py

@@ -0,0 +1,264 @@
+"""
+Design tokens and theme configuration for the Abogen Flet frontend.
+
+This module defines the application's complete colour palette, typography
+scale, spacing constants, and border radii in one canonical place.
+All component modules import from here; changing a value here propagates
+instantly across the entire UI.
+
+Flet's ``ft.Theme`` uses ``ColorScheme``, but for custom widgets we paint
+directly with hex colours drawn from ``LIGHT`` and ``DARK`` palettes.
+"""
+
+from __future__ import annotations
+
+import flet as ft
+from dataclasses import dataclass
+
+
+# ---------------------------------------------------------------------------
+# Colour palettes
+# ---------------------------------------------------------------------------
+
+
+@dataclass(frozen=True)
+class _Palette:
+    """A complete colour palette for one theme mode."""
+
+    # Backgrounds
+    bg_base: str        # Deepest background (window / page)
+    bg_surface: str     # Cards, panels, dialogs
+    bg_elevated: str    # Slightly raised elements (toolbar, sidebar)
+    bg_input: str       # Text-field / dropdown backgrounds
+
+    # Brand accent
+    accent: str         # Primary interactive colour (buttons, links)
+    accent_muted: str   # Hover tint over accents
+    accent_on: str      # Text drawn on top of accent fills
+
+    # Semantic
+    success: str
+    error: str
+    warning: str
+    info: str
+
+    # Text hierarchy
+    text_primary: str
+    text_secondary: str
+    text_disabled: str
+    text_on_accent: str
+
+    # Borders / dividers
+    border: str
+    border_focused: str
+    divider: str
+
+    # Specific UI atoms
+    drop_zone_border: str
+    drop_zone_bg: str
+    drop_zone_active_border: str
+    drop_zone_active_bg: str
+    log_bg: str
+    log_text: str
+    progress_bar_bg: str
+    progress_bar_fill: str
+    sidebar_bg: str
+    sidebar_selected_bg: str
+    sidebar_selected_text: str
+    nav_indicator: str
+
+
+DARK = _Palette(
+    bg_base="#0f1117",
+    bg_surface="#181b23",
+    bg_elevated="#1e2230",
+    bg_input="#252a38",
+
+    accent="#5b8af5",
+    accent_muted="#3a5fc4",
+    accent_on="#ffffff",
+
+    success="#42ad4a",
+    error="#e84e3c",
+    warning="#f5a623",
+    info="#5b8af5",
+
+    text_primary="#e8eaf0",
+    text_secondary="#9ba3b8",
+    text_disabled="#4e5568",
+    text_on_accent="#ffffff",
+
+    border="#2c3147",
+    border_focused="#5b8af5",
+    divider="#252a38",
+
+    drop_zone_border="#3a4466",
+    drop_zone_bg="#151928",
+    drop_zone_active_border="#42ad4a",
+    drop_zone_active_bg="#0d1f10",
+    log_bg="#0d1117",
+    log_text="#b0b8cc",
+    progress_bar_bg="#1e2230",
+    progress_bar_fill="#5b8af5",
+    sidebar_bg="#13161f",
+    sidebar_selected_bg="#252a38",
+    sidebar_selected_text="#5b8af5",
+    nav_indicator="#5b8af5",
+)
+
+LIGHT = _Palette(
+    bg_base="#f4f5f8",
+    bg_surface="#ffffff",
+    bg_elevated="#edf0f5",
+    bg_input="#f0f2f7",
+
+    accent="#3a5fc4",
+    accent_muted="#2a4fae",
+    accent_on="#ffffff",
+
+    success="#2e9437",
+    error="#c0392b",
+    warning="#d4870a",
+    info="#3a5fc4",
+
+    text_primary="#1a1d27",
+    text_secondary="#5a6172",
+    text_disabled="#9ba3b8",
+    text_on_accent="#ffffff",
+
+    border="#dce0ea",
+    border_focused="#3a5fc4",
+    divider="#e8ebf2",
+
+    drop_zone_border="#a8b4d0",
+    drop_zone_bg="#f7f8fd",
+    drop_zone_active_border="#2e9437",
+    drop_zone_active_bg="#f0fff1",
+    log_bg="#f8f9fc",
+    log_text="#3d4358",
+    progress_bar_bg="#e4e8f0",
+    progress_bar_fill="#3a5fc4",
+    sidebar_bg="#eff1f5",
+    sidebar_selected_bg="#dde3f2",
+    sidebar_selected_text="#3a5fc4",
+    nav_indicator="#3a5fc4",
+)
+
+
+# ---------------------------------------------------------------------------
+# Typography
+# ---------------------------------------------------------------------------
+
+FONT_FAMILY = "Inter, Segoe UI, Roboto, system-ui, sans-serif"
+FONT_SIZE_XS = 11
+FONT_SIZE_SM = 12
+FONT_SIZE_BASE = 14
+FONT_SIZE_MD = 16
+FONT_SIZE_LG = 20
+FONT_SIZE_XL = 26
+FONT_SIZE_DISPLAY = 34
+
+
+# ---------------------------------------------------------------------------
+# Spacing scale (pixels)
+# ---------------------------------------------------------------------------
+
+SPACE_XS = 4
+SPACE_SM = 8
+SPACE_MD = 12
+SPACE_LG = 16
+SPACE_XL = 24
+SPACE_2XL = 32
+SPACE_3XL = 48
+
+
+# ---------------------------------------------------------------------------
+# Border radii
+# ---------------------------------------------------------------------------
+
+RADIUS_SM = 6
+RADIUS_MD = 10
+RADIUS_LG = 16
+RADIUS_FULL = 999  # Pill-shaped
+
+
+# ---------------------------------------------------------------------------
+# Flet ColorScheme builders
+# ---------------------------------------------------------------------------
+
+
+def build_color_scheme(palette: _Palette) -> ft.ColorScheme:
+    """
+    Construct a ``ft.ColorScheme`` from a ``_Palette`` object.
+
+    Args:
+        palette: The ``DARK`` or ``LIGHT`` palette.
+
+    Returns:
+        A fully-populated Flet ``ColorScheme``.
+    """
+    return ft.ColorScheme(
+        primary=palette.accent,
+        on_primary=palette.accent_on,
+        primary_container=palette.accent_muted,
+        secondary=palette.accent,
+        on_secondary=palette.text_on_accent,
+        surface=palette.bg_surface,
+        on_surface=palette.text_primary,
+        on_surface_variant=palette.text_secondary,
+        error=palette.error,
+        on_error=palette.text_on_accent,
+        outline=palette.border,
+    )
+
+
+def build_text_theme() -> ft.TextTheme:
+    """
+    Construct a ``ft.TextTheme`` using the application's type scale.
+
+    Returns:
+        A Flet ``TextTheme`` with consistent font-size assignments.
+    """
+    return ft.TextTheme(
+        display_large=ft.TextStyle(size=FONT_SIZE_DISPLAY, weight=ft.FontWeight.W_700),
+        headline_large=ft.TextStyle(size=FONT_SIZE_XL, weight=ft.FontWeight.W_700),
+        headline_medium=ft.TextStyle(size=FONT_SIZE_LG, weight=ft.FontWeight.W_600),
+        title_large=ft.TextStyle(size=FONT_SIZE_MD, weight=ft.FontWeight.W_600),
+        title_medium=ft.TextStyle(size=FONT_SIZE_BASE, weight=ft.FontWeight.W_500),
+        body_large=ft.TextStyle(size=FONT_SIZE_BASE),
+        body_medium=ft.TextStyle(size=FONT_SIZE_SM),
+        label_large=ft.TextStyle(size=FONT_SIZE_SM, weight=ft.FontWeight.W_500),
+        label_medium=ft.TextStyle(size=FONT_SIZE_XS),
+    )
+
+
+def make_theme(dark: bool) -> ft.Theme:
+    """
+    Build a complete Flet ``Theme`` for the requested mode.
+
+    Args:
+        dark: True for dark-mode theme, False for light-mode theme.
+
+    Returns:
+        A configured ``ft.Theme`` instance.
+    """
+    palette = DARK if dark else LIGHT
+    return ft.Theme(
+        color_scheme=build_color_scheme(palette),
+        text_theme=build_text_theme(),
+        color_scheme_seed=palette.accent,
+        use_material3=True,
+    )
+
+
+def get_palette(page: ft.Page) -> _Palette:
+    """
+    Return the active colour palette for the given page.
+
+    Args:
+        page: The Flet ``Page`` instance.
+
+    Returns:
+        ``DARK`` or ``LIGHT`` depending on the page's theme mode.
+    """
+    return DARK if page.theme_mode == ft.ThemeMode.DARK else LIGHT

abogen/frontend/views/__init__.py

@@ -0,0 +1,6 @@
+"""Views sub-package for the Abogen Flet frontend."""
+from .dashboard import DashboardView
+from .settings import SettingsView
+from .queue_view import QueueView
+
+__all__ = ["DashboardView", "SettingsView", "QueueView"]

abogen/frontend/views/dashboard.py

@@ -0,0 +1,587 @@
+"""
+Dashboard view – the primary conversion screen.
+
+Hosts the file drop-zone, voice/speed/format controls, real-time log
+terminal, progress bar, and the Start/Cancel/Finish action row.
+
+All heavy work is delegated to ConversionBridge which runs on daemon
+threads and schedules UI updates back onto the Flet event loop.
+"""
+from __future__ import annotations
+
+import os
+import tempfile
+from pathlib import Path
+from typing import Optional
+
+import flet as ft
+
+from ..state import AppState
+from ..utils.helpers import (
+    detect_file_type, human_readable_size, format_number,
+    format_etr, grouped_voices, output_format_label,
+    subtitle_format_label, is_book_type, voice_lang_code, SUPPORTED_EXTENSIONS
+)
+from ..utils.theme import get_palette, RADIUS_MD, RADIUS_SM, SPACE_SM, SPACE_MD, SPACE_LG, SPACE_XL
+from ..utils.conversion_bridge import ConversionBridge
+from ..components import (
+    build_drop_zone, build_log_terminal, log_entry,
+    build_primary_button, build_secondary_button,
+    build_card, build_section_header, labelled_row, show_snack,
+)
+from abogen.constants import (
+    SUBTITLE_FORMATS, SUPPORTED_LANGUAGES_FOR_SUBTITLE_GENERATION,
+    LANGUAGE_DESCRIPTIONS, VOICES_INTERNAL,
+)
+from abogen.utils import get_gpu_acceleration, get_user_cache_path, calculate_text_length, clean_text
+
+
+class DashboardView:
+    """
+    The main conversion dashboard.
+
+    Instantiated once per Flet session and mounted as a ``ft.Column``
+    inside the page's content area.
+    """
+
+    def __init__(self, page: ft.Page, state: AppState) -> None:
+        self._page = page
+        self._state = state
+        self._bridge = ConversionBridge(page, state)
+
+        # Internal refs
+        self._log_list: Optional[ft.ListView] = None
+        self._progress_bar: Optional[ft.ProgressBar] = None
+        self._etr_label: Optional[ft.Text] = None
+        self._drop_zone_ref: Optional[ft.GestureDetector] = None
+        self._drop_zone_container: Optional[ft.Container] = None
+        self._file_picker: Optional[ft.FilePicker] = None
+
+        # Wire state callbacks
+        state.on_log = self._on_log
+        state.on_progress = self._on_progress
+        state.on_conversion_finished = self._on_finished
+
+        # Build UI refs
+        self._voice_dd: Optional[ft.Dropdown] = None
+        self._speed_slider: Optional[ft.Slider] = None
+        self._speed_label: Optional[ft.Text] = None
+        self._format_dd: Optional[ft.Dropdown] = None
+        self._subtitle_dd: Optional[ft.Dropdown] = None
+        self._subtitle_fmt_dd: Optional[ft.Dropdown] = None
+        self._gpu_switch: Optional[ft.Switch] = None
+        self._start_btn: Optional[ft.ElevatedButton] = None
+        self._cancel_btn: Optional[ft.OutlinedButton] = None
+        self._finish_col: Optional[ft.Column] = None
+        self._controls_col: Optional[ft.Column] = None
+        self._log_section: Optional[ft.Container] = None
+        self._progress_col: Optional[ft.Column] = None
+
+    # ------------------------------------------------------------------
+    # Build
+    # ------------------------------------------------------------------
+
+    def build(self) -> ft.Column:
+        """Return the complete dashboard column."""
+        p = self._page
+        dark = p.theme_mode == ft.ThemeMode.DARK
+        pal = get_palette(p)
+        if self._file_picker is None:
+            self._file_picker = ft.FilePicker()
+
+        # --- Drop zone ---
+        self._drop_zone_container = ft.Container()
+        self._refresh_drop_zone()
+
+        # --- Voice selector ---
+        voice_items = []
+        for lang_label, voices in grouped_voices():
+            voice_items.append(ft.dropdown.Option(key=f"__hdr_{lang_label}", text=f"── {lang_label} ──", disabled=True))
+            for v in voices:
+                voice_items.append(ft.dropdown.Option(key=v, text=v))
+
+        self._voice_dd = ft.Dropdown(
+            options=voice_items,
+            value=self._state.selected_voice,
+            on_select=self._on_voice_changed,
+            dense=True,
+            expand=True,
+            border_radius=RADIUS_SM,
+        )
+
+        # --- Speed slider ---
+        self._speed_label = ft.Text(f"{self._state.speed:.2f}", size=13, width=40)
+        self._speed_slider = ft.Slider(
+            min=0.1, max=2.0, value=self._state.speed,
+            divisions=190, label="{value}",
+            on_change=self._on_speed_changed,
+            expand=True,
+        )
+
+        # --- Format ---
+        self._format_dd = ft.Dropdown(
+            options=[ft.dropdown.Option(key=k, text=output_format_label(k))
+                     for k in ("wav", "flac", "mp3", "opus", "m4b")],
+            value=self._state.selected_format,
+            on_select=lambda e: self._set_field("selected_format", e.control.value),
+            dense=True, expand=True, border_radius=RADIUS_SM,
+        )
+
+        # --- Subtitle mode ---
+        sub_modes = ["Disabled", "Line", "Sentence", "Sentence + Comma",
+                     "Sentence + Highlighting"] + [f"{i} word{'s' if i > 1 else ''}" for i in range(1, 11)]
+        self._subtitle_dd = ft.Dropdown(
+            options=[ft.dropdown.Option(m) for m in sub_modes],
+            value=self._state.subtitle_mode,
+            on_select=lambda e: self._set_field("subtitle_mode", e.control.value),
+            dense=True, expand=True, border_radius=RADIUS_SM,
+        )
+
+        # --- Subtitle format ---
+        self._subtitle_fmt_dd = ft.Dropdown(
+            options=[ft.dropdown.Option(key=k, text=lbl) for k, lbl in SUBTITLE_FORMATS],
+            value=self._state.subtitle_format,
+            on_select=lambda e: self._set_field("subtitle_format", e.control.value),
+            dense=True, expand=True, border_radius=RADIUS_SM,
+        )
+
+        # --- GPU ---
+        self._gpu_switch = ft.Switch(
+            value=self._state.use_gpu, label="",
+            on_change=lambda e: self._set_field("use_gpu", e.control.value),
+            active_color="#5b8af5" if dark else "#3a5fc4",
+        )
+
+        # --- Log ---
+        log_lv = ft.ListView(expand=True, auto_scroll=True, spacing=1, padding=ft.Padding.all(8))
+        self._log_list = log_lv
+        bg_log = "#0d1117" if dark else "#f8f9fc"
+        bd_log = "#252a38" if dark else "#dce0ea"
+        self._log_section = ft.Container(
+            content=log_lv, bgcolor=bg_log,
+            border=ft.Border.all(1, bd_log),
+            border_radius=RADIUS_SM, height=220,
+            clip_behavior=ft.ClipBehavior.HARD_EDGE,
+            visible=False,
+        )
+
+        # --- Progress ---
+        fill = "#5b8af5" if dark else "#3a5fc4"
+        bg_p = "#1e2230" if dark else "#e4e8f0"
+        self._progress_bar = ft.ProgressBar(
+            value=0, color=fill, bgcolor=bg_p, height=8,
+            border_radius=ft.BorderRadius.all(4), expand=True,
+        )
+        self._etr_label = ft.Text("", size=11, color=pal.text_secondary, text_align=ft.TextAlign.CENTER)
+        self._progress_col = ft.Column([
+            ft.Row([self._progress_bar], spacing=0),
+            self._etr_label,
+        ], spacing=SPACE_SM, horizontal_alignment=ft.CrossAxisAlignment.CENTER, visible=False)
+
+        # --- Buttons ---
+        self._start_btn = build_primary_button(
+            "Start Conversion",
+            icon="play_arrow",
+            on_click=self._on_start,
+            page=p,
+        )
+        self._cancel_btn = build_secondary_button(
+            "Cancel", icon="stop",
+            on_click=self._on_cancel, page=p,
+        )
+        self._cancel_btn.visible = False
+
+        # --- Finish row ---
+        self._finish_col = ft.Column([
+            ft.Row([
+                build_secondary_button("Open File", icon="open_in_new",
+                                       on_click=self._on_open_file, page=p),
+                build_secondary_button("Go to Folder", icon="folder_open",
+                                       on_click=self._on_go_folder, page=p),
+                build_secondary_button("New Conversion", icon="refresh",
+                                       on_click=self._on_reset, page=p),
+            ], wrap=True, spacing=SPACE_SM, run_spacing=SPACE_SM),
+        ], visible=False)
+
+        # --- Controls column ---
+        self._controls_col = ft.Column([
+            build_section_header("Voice & Speed", icon="record_voice_over", page=p),
+            labelled_row("Voice", self._voice_dd, page=p),
+            labelled_row("Speed", ft.Row([self._speed_slider, self._speed_label], expand=True, spacing=SPACE_SM), page=p),
+            ft.Divider(height=1, color=pal.divider),
+            build_section_header("Output", icon="audio_file", page=p),
+            labelled_row("Format", self._format_dd, page=p),
+            labelled_row("Subtitles", self._subtitle_dd, page=p),
+            labelled_row("Subtitle Format", self._subtitle_fmt_dd, page=p),
+            ft.Divider(height=1, color=pal.divider),
+            build_section_header("Processing", icon="memory", page=p),
+            labelled_row("GPU Acceleration", self._gpu_switch, page=p),
+        ], spacing=SPACE_MD)
+
+        outer = ft.Column([
+            self._drop_zone_container,
+            ft.Container(height=SPACE_MD),
+            build_card(self._controls_col, page=p),
+            ft.Container(height=SPACE_SM),
+            self._log_section,
+            self._progress_col,
+            ft.Row([self._start_btn, self._cancel_btn], spacing=SPACE_SM, wrap=True),
+            self._finish_col,
+        ], spacing=SPACE_MD, expand=True, scroll=ft.ScrollMode.AUTO)
+
+        return outer
+
+    # ------------------------------------------------------------------
+    # Drop-zone management
+    # ------------------------------------------------------------------
+
+    def _refresh_drop_zone(self, *, accent: bool = False, error: bool = False, err_msg: str = "") -> None:
+        """Rebuild the drop-zone widget and update its container."""
+        p = self._page
+        s = self._state
+        fname = None; fsize = None; fchars = None
+        if s.selected_file and os.path.exists(s.selected_file):
+            disp = s.displayed_file_path or s.selected_file
+            fname = os.path.basename(disp)
+            try:
+                fsize = human_readable_size(os.path.getsize(s.selected_file))
+            except Exception:
+                fsize = ""
+            if s.char_count:
+                fchars = format_number(s.char_count)
+
+        label = err_msg if error else "Drag & drop your file here or click to browse"
+        sub = "Supports .txt · .epub · .pdf · .md · .srt · .ass · .vtt"
+
+        dz = build_drop_zone(
+            on_pick=self._open_file_picker,
+            label=label, sub_label=sub,
+            accent=accent, error=error,
+            filename=fname, file_size=fsize, char_count=fchars,
+            page=p,
+        )
+        if self._drop_zone_container is not None:
+            self._drop_zone_container.content = dz
+        self._drop_zone_ref = dz
+
+    # ------------------------------------------------------------------
+    # File picking
+    # ------------------------------------------------------------------
+
+    def _open_file_picker(self) -> None:
+        """Open the native file picker dialog."""
+        self._page.run_task(self._pick_files_async)
+
+    async def _pick_files_async(self) -> None:
+        """Run the file picker using Flet's async service API."""
+        picker = self._file_picker
+        if picker is None:
+            picker = ft.FilePicker()
+            self._file_picker = picker
+
+        try:
+            files = await picker.pick_files(
+                dialog_title="Select Input File",
+                file_type=ft.FilePickerFileType.CUSTOM,
+                allowed_extensions=["txt", "epub", "pdf", "md", "markdown", "srt", "ass", "vtt"],
+                allow_multiple=False,
+            )
+        except Exception as ex:
+            self._refresh_drop_zone(error=True, err_msg="Could not open file picker.")
+            show_snack(self._page, f"File picker error: {ex}", error=True)
+            self._page.update()
+            return
+        if not files:
+            return
+        file_path = files[0].path
+        if not file_path or not os.path.exists(file_path):
+            return
+        self._load_file(file_path)
+
+    def _load_file(self, file_path: str) -> None:
+        """Validate and load a file into the session state."""
+        from pathlib import Path as _Path
+        ext = _Path(file_path).suffix.lower()
+        if ext not in SUPPORTED_EXTENSIONS:
+            self._state.reset_file_state()
+            self._refresh_drop_zone(error=True, err_msg=f"Unsupported file type: {ext}")
+            self._page.update()
+            return
+
+        ftype = detect_file_type(file_path)
+        s = self._state
+
+        if ftype in ("epub", "pdf", "markdown"):
+            # For book types: extract text to temp cache
+            self._handle_book_file(file_path, ftype)
+        else:
+            # Plain text / subtitle files
+            s.selected_file = file_path
+            s.selected_file_type = ftype
+            s.displayed_file_path = file_path
+            try:
+                with open(file_path, "r", encoding="utf-8", errors="ignore") as f:
+                    text = f.read()
+                s.char_count = calculate_text_length(clean_text(text))
+            except Exception:
+                s.char_count = 0
+            self._refresh_drop_zone(accent=True)
+            self._update_subtitle_availability()
+            self._page.update()
+
+    def _handle_book_file(self, book_path: str, ftype: str) -> None:
+        """Extract text from epub/pdf/markdown and store as temp txt."""
+        import threading as _t
+        s = self._state
+
+        def _extract():
+            try:
+                from abogen.text_extractor import extract_from_path
+                chapters = extract_from_path(book_path, file_type=ftype)
+                combined = "\n\n".join(ch.text for ch in chapters if ch.text.strip())
+                cache_dir = get_user_cache_path()
+                base = os.path.splitext(os.path.basename(book_path))[0]
+                fd, tmp = tempfile.mkstemp(prefix=f"{base}_", suffix=".txt", dir=cache_dir)
+                os.close(fd)
+                with open(tmp, "w", encoding="utf-8") as f:
+                    f.write(combined)
+
+                s.selected_file = tmp
+                s.selected_file_type = ftype
+                s.selected_book_path = book_path
+                s.displayed_file_path = book_path
+                s.char_count = calculate_text_length(clean_text(combined))
+                s.selected_chapters = [f"ch_{i}" for i in range(len(chapters))]
+
+                self._refresh_drop_zone(accent=True)
+                self._update_subtitle_availability()
+                self._page.update()
+            except Exception as ex:
+                s.reset_file_state()
+                self._refresh_drop_zone(error=True, err_msg=f"Could not parse file: {ex}")
+                self._page.update()
+
+        _t.Thread(target=_extract, daemon=True).start()
+
+    # ------------------------------------------------------------------
+    # Control event handlers
+    # ------------------------------------------------------------------
+
+    def _set_field(self, attr: str, value) -> None:
+        setattr(self._state, attr, value)
+        self._state.persist_config()
+
+    def _on_voice_changed(self, e: ft.ControlEvent) -> None:
+        v = e.control.value or "af_heart"
+        self._state.selected_voice = v
+        self._state.selected_lang = voice_lang_code(v)
+        self._state.persist_config()
+        self._update_subtitle_availability()
+        self._page.update()
+
+    def _on_speed_changed(self, e: ft.ControlEvent) -> None:
+        val = round(float(e.control.value), 2)
+        self._state.speed = val
+        if self._speed_label:
+            self._speed_label.value = f"{val:.2f}"
+        self._state.persist_config()
+        self._page.update()
+
+    def _update_subtitle_availability(self) -> None:
+        """Enable or disable subtitle controls based on selected language."""
+        lang = self._state.selected_lang
+        enabled = lang in SUPPORTED_LANGUAGES_FOR_SUBTITLE_GENERATION
+        if self._subtitle_dd:
+            self._subtitle_dd.disabled = not enabled
+        if self._subtitle_fmt_dd:
+            self._subtitle_fmt_dd.disabled = not enabled
+
+    # ------------------------------------------------------------------
+    # Conversion control
+    # ------------------------------------------------------------------
+
+    def _on_start(self, _: ft.ControlEvent) -> None:
+        """Validate inputs and kick off conversion."""
+        s = self._state
+        if not s.selected_file or not os.path.exists(s.selected_file):
+            self._refresh_drop_zone(error=True, err_msg="Please select an input file first.")
+            self._page.update()
+            return
+
+        # Transition UI to converting state
+        self._set_converting_ui(True)
+
+        self._bridge.start(
+            input_file=s.selected_file,
+            voice=s.get_voice_formula(),
+            lang_code=s.selected_lang,
+            speed=s.speed,
+            output_format=s.selected_format,
+            subtitle_mode=s.subtitle_mode,
+            subtitle_format=s.subtitle_format,
+            use_gpu=s.use_gpu,
+            save_option=s.save_option,
+            output_folder=s.selected_output_folder,
+            replace_single_newlines=s.replace_single_newlines,
+            char_count=s.char_count,
+            save_chapters_separately=s.save_chapters_separately or False,
+            merge_chapters_at_end=True if s.merge_chapters_at_end is None else s.merge_chapters_at_end,
+            separate_chapters_format=s.separate_chapters_format,
+            silence_between_chapters=s.silence_duration,
+            max_subtitle_words=s.max_subtitle_words,
+            chapter_intro_delay=s.chapter_intro_delay,
+            read_title_intro=s.read_title_intro,
+            read_closing_outro=s.read_closing_outro,
+            auto_prefix_chapter_titles=s.auto_prefix_chapter_titles,
+            normalize_chapter_opening_caps=s.normalize_chapter_opening_caps,
+            tts_provider=s.tts_provider,
+            supertonic_total_steps=s.supertonic_total_steps,
+            chunk_level=s.chunk_level,
+            generate_epub3=s.generate_epub3,
+            word_substitutions_enabled=s.word_substitutions_enabled,
+            word_substitutions_list=s.word_substitutions_list,
+            case_sensitive_substitutions=s.case_sensitive_substitutions,
+            replace_all_caps=s.replace_all_caps,
+            replace_numerals=s.replace_numerals,
+            fix_nonstandard_punctuation=s.fix_nonstandard_punctuation,
+        )
+
+    def _on_cancel(self, _: ft.ControlEvent) -> None:
+        self._bridge.cancel()
+
+    def _set_converting_ui(self, converting: bool) -> None:
+        """Toggle UI between idle and converting states."""
+        if self._start_btn:
+            self._start_btn.visible = not converting
+        if self._cancel_btn:
+            self._cancel_btn.visible = converting
+        if self._controls_col:
+            self._controls_col.visible = not converting
+        if self._log_section:
+            self._log_section.visible = converting
+            if self._log_list:
+                self._log_list.controls.clear()
+        if self._progress_col:
+            self._progress_col.visible = converting
+            if self._progress_bar:
+                self._progress_bar.value = 0
+            if self._etr_label:
+                self._etr_label.value = "Estimating…"
+        if self._finish_col:
+            self._finish_col.visible = False
+        self._page.update()
+
+    # ------------------------------------------------------------------
+    # State callbacks (called from background thread via page.run_task)
+    # ------------------------------------------------------------------
+
+    def _on_log(self, message: str, level: str) -> None:
+        if self._log_list is None:
+            return
+        entry = log_entry(message, level, self._page)
+        self._log_list.controls.append(entry)
+        # Cap log lines
+        if len(self._log_list.controls) > 2000:
+            self._log_list.controls = self._log_list.controls[-1800:]
+        try:
+            self._page.update()
+        except Exception:
+            pass
+
+    def _on_progress(self, fraction: float, etr: Optional[float]) -> None:
+        if self._progress_bar:
+            self._progress_bar.value = min(fraction, 0.99)
+        if self._etr_label:
+            self._etr_label.value = format_etr(etr)
+        try:
+            self._page.update()
+        except Exception:
+            pass
+
+    def _on_finished(self, message: str, output_path: Optional[str]) -> None:
+        if self._progress_bar:
+            self._progress_bar.value = 1.0
+        if self._cancel_btn:
+            self._cancel_btn.visible = False
+
+        if message == "Cancelled":
+            # Restore idle state
+            self._set_converting_ui(False)
+            show_snack(self._page, "Conversion cancelled.", error=True)
+            return
+
+        if "failed" in message.lower() or "error" in message.lower():
+            self._log_on_log(message, "error")
+            self._set_converting_ui(False)
+            show_snack(self._page, f"Error: {message}", error=True)
+            return
+
+        # Success
+        if self._log_section:
+            self._log_section.visible = True
+        if self._progress_col:
+            self._progress_col.visible = False
+        if self._controls_col:
+            self._controls_col.visible = False
+        if self._finish_col:
+            self._finish_col.visible = True
+        if self._start_btn:
+            self._start_btn.visible = False
+        show_snack(self._page, "Conversion completed!")
+        try:
+            self._page.update()
+        except Exception:
+            pass
+
+    def _log_on_log(self, message: str, level: str) -> None:
+        self._on_log(message, level)
+
+    # ------------------------------------------------------------------
+    # Finish actions
+    # ------------------------------------------------------------------
+
+    def _on_open_file(self, _: ft.ControlEvent) -> None:
+        path = self._state.last_output_path
+        if path and os.path.exists(path):
+            import subprocess, platform
+            try:
+                if platform.system() == "Darwin":
+                    subprocess.Popen(["open", path])
+                elif platform.system() == "Windows":
+                    os.startfile(path)
+                else:
+                    subprocess.Popen(["xdg-open", path])
+            except Exception as ex:
+                show_snack(self._page, f"Cannot open file: {ex}", error=True)
+        else:
+            show_snack(self._page, "Output file not found.", error=True)
+
+    def _on_go_folder(self, _: ft.ControlEvent) -> None:
+        path = self._state.last_output_path
+        folder = os.path.dirname(path) if path and os.path.isfile(path) else path
+        if folder and os.path.isdir(folder):
+            import subprocess, platform
+            try:
+                if platform.system() == "Darwin":
+                    subprocess.Popen(["open", folder])
+                elif platform.system() == "Windows":
+                    subprocess.Popen(["explorer", folder])
+                else:
+                    subprocess.Popen(["xdg-open", folder])
+            except Exception as ex:
+                show_snack(self._page, f"Cannot open folder: {ex}", error=True)
+        else:
+            show_snack(self._page, "Output folder not found.", error=True)
+
+    def _on_reset(self, _: ft.ControlEvent) -> None:
+        self._state.reset_file_state()
+        self._state.reset_conversion_state()
+        self._refresh_drop_zone()
+        self._set_converting_ui(False)
+        if self._finish_col:
+            self._finish_col.visible = False
+        if self._controls_col:
+            self._controls_col.visible = True
+        if self._start_btn:
+            self._start_btn.visible = True
+        self._page.update()

abogen/frontend/views/queue_view.py

@@ -0,0 +1,154 @@
+"""
+Queue management view.
+
+Displays the current conversion queue, allowing the user to reorder,
+remove, and inspect queued items before starting batch processing.
+"""
+from __future__ import annotations
+from typing import Optional
+
+import flet as ft
+
+from ..state import AppState, ConversionJob
+from ..utils.theme import get_palette, RADIUS_SM, SPACE_SM, SPACE_MD, SPACE_LG
+from ..utils.helpers import safe_basename, output_format_label, format_number
+from ..components import (
+    build_card, build_section_header, build_primary_button,
+    build_secondary_button, show_snack, build_divider,
+    resolve_icon,
+)
+
+
+class QueueView:
+    """Queue manager view."""
+
+    def __init__(self, page: ft.Page, state: AppState) -> None:
+        self._page = page
+        self._state = state
+        self._list_col: Optional[ft.Column] = None
+
+    def build(self) -> ft.Column:
+        p = self._page
+        s = self._state
+        pal = get_palette(p)
+        dark = p.theme_mode == ft.ThemeMode.DARK
+
+        self._list_col = ft.Column(spacing=SPACE_SM)
+        self._refresh_list()
+
+        header = build_section_header("Conversion Queue",
+                                      icon="list_alt", page=p)
+
+        action_row = ft.Row([
+            build_primary_button(
+                "Start Queue",
+                icon="play_arrow",
+                on_click=self._on_start_queue,
+                page=p,
+                disabled=not s.queued_items,
+            ),
+            build_secondary_button(
+                "Clear All",
+                icon="delete_sweep",
+                on_click=self._on_clear_queue,
+                page=p,
+            ),
+        ], spacing=SPACE_SM, wrap=True)
+
+        queue_card = build_card(ft.Column([
+            header,
+            ft.Divider(height=1, color=pal.divider),
+            self._list_col,
+            ft.Container(height=SPACE_SM),
+            action_row,
+        ], spacing=SPACE_MD), page=p)
+
+        return ft.Column([queue_card], scroll=ft.ScrollMode.AUTO, expand=True)
+
+    # ------------------------------------------------------------------
+
+    def _refresh_list(self) -> None:
+        if self._list_col is None:
+            return
+        self._list_col.controls.clear()
+        s = self._state
+        pal = get_palette(self._page)
+        dark = self._page.theme_mode == ft.ThemeMode.DARK
+
+        if not s.queued_items:
+            self._list_col.controls.append(
+                ft.Text("No items in the queue.", size=13,
+                        color=pal.text_secondary,
+                        text_align=ft.TextAlign.CENTER)
+            )
+            return
+
+        for idx, job in enumerate(s.queued_items):
+            tile = self._build_job_tile(idx, job, dark, pal)
+            self._list_col.controls.append(tile)
+
+        try:
+            self._page.update()
+        except Exception:
+            pass
+
+    def _build_job_tile(self, idx: int, job: ConversionJob, dark: bool, pal) -> ft.Container:
+        """Build a single queue-item tile."""
+        bg = pal.bg_elevated
+        border_clr = pal.border
+        accent = "#5b8af5" if dark else "#3a5fc4"
+        text_primary = pal.text_primary
+        text_secondary = pal.text_secondary
+
+        def _remove(_):
+            self._state.queued_items.pop(idx)
+            self._refresh_list()
+
+        name = safe_basename(job.display_name or job.file_path)
+        details = (
+            f"Voice: {job.voice}  ·  Format: {output_format_label(job.output_format)}"
+            f"  ·  Speed: {job.speed:.2f}x  ·  Chars: {format_number(job.char_count)}"
+        )
+
+        return ft.Container(
+            content=ft.Row([
+                ft.Container(
+                    content=ft.Text(str(idx + 1), size=12, weight=ft.FontWeight.W_700,
+                                    color=accent),
+                    width=32,
+                ),
+                ft.Column([
+                    ft.Text(name, size=13, weight=ft.FontWeight.W_600, color=text_primary,
+                            no_wrap=True, overflow=ft.TextOverflow.ELLIPSIS),
+                    ft.Text(details, size=11, color=text_secondary),
+                ], expand=True, tight=True, spacing=2),
+                ft.IconButton(
+                    icon=resolve_icon("delete_outline"),
+                    icon_color=pal.error if hasattr(pal, "error") else "#e84e3c",
+                    icon_size=18,
+                    tooltip="Remove",
+                    on_click=_remove,
+                ),
+            ], vertical_alignment=ft.CrossAxisAlignment.CENTER, spacing=SPACE_SM),
+            bgcolor=bg,
+            border=ft.Border.all(1, border_clr),
+            border_radius=RADIUS_SM,
+            padding=ft.Padding.symmetric(horizontal=SPACE_MD, vertical=SPACE_SM),
+        )
+
+    # ------------------------------------------------------------------
+
+    def _on_start_queue(self, _: ft.ControlEvent) -> None:
+        if not self._state.queued_items:
+            show_snack(self._page, "Queue is empty.", error=True)
+            return
+        # Navigate to dashboard and trigger queue start
+        # This is wired in main.py via the nav controller
+        self._page.pubsub.send_all("start_queue")
+
+    def _on_clear_queue(self, _: ft.ControlEvent) -> None:
+        if not self._state.queued_items:
+            return
+        self._state.queued_items.clear()
+        self._refresh_list()
+        show_snack(self._page, "Queue cleared.")

abogen/frontend/views/settings.py

@@ -0,0 +1,305 @@
+"""
+Settings view – a categorised, scrollable settings page.
+
+Groups settings into collapsible cards:
+  - Output (format, save location, chapters)
+  - Text processing (newlines, caps, substitutions, numerals)
+  - Subtitle options
+  - TTS pipeline (provider, GPU, chunking)
+  - Integrations (Audiobookshelf, Calibre OPDS)
+"""
+from __future__ import annotations
+from typing import Optional
+
+import flet as ft
+
+from ..state import AppState
+from ..utils.theme import get_palette, RADIUS_MD, RADIUS_SM, SPACE_SM, SPACE_MD, SPACE_LG
+from ..utils.helpers import output_format_label, subtitle_format_label, SUPPORTED_EXTENSIONS
+from ..components import (
+    build_card, build_section_header, labelled_row, show_snack, build_divider,
+    build_primary_button,
+)
+from abogen.constants import SUBTITLE_FORMATS
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+def _dd(options, value, on_change, **kw):
+    """Compact dropdown factory."""
+    return ft.Dropdown(
+        options=[ft.dropdown.Option(key=k, text=v) for k, v in options],
+        value=value, on_select=on_change, dense=True,
+        border_radius=RADIUS_SM, expand=True, **kw
+    )
+
+
+def _sw(value, on_change, label=""):
+    return ft.Switch(value=value, on_change=on_change, label=label)
+
+
+class SettingsView:
+    """The full settings panel."""
+
+    def __init__(self, page: ft.Page, state: AppState) -> None:
+        self._page = page
+        self._state = state
+
+    def build(self) -> ft.Column:
+        p = self._page
+        s = self._state
+        pal = get_palette(p)
+
+        # ── Output card ──────────────────────────────────────────────
+        format_dd = _dd(
+            [(k, output_format_label(k)) for k in ("wav", "flac", "mp3", "opus", "m4b")],
+            s.selected_format,
+            lambda e: self._save("selected_format", e.control.value),
+        )
+        save_dd = _dd(
+            [
+                ("Save next to input file", "Save next to input file"),
+                ("Save to Desktop", "Save to Desktop"),
+                ("Choose output folder", "Choose output folder"),
+            ],
+            s.save_option,
+            lambda e: self._save("save_option", e.control.value),
+        )
+        chapters_sw = _sw(s.save_chapters_separately or False,
+                          lambda e: self._save("save_chapters_separately", e.control.value))
+        merge_sw = _sw(True if s.merge_chapters_at_end is None else s.merge_chapters_at_end,
+                       lambda e: self._save("merge_chapters_at_end", e.control.value))
+        sep_fmt_dd = _dd(
+            [(k, output_format_label(k)) for k in ("wav", "flac", "mp3", "opus")],
+            s.separate_chapters_format,
+            lambda e: self._save("separate_chapters_format", e.control.value),
+        )
+        epub3_sw = _sw(s.generate_epub3, lambda e: self._save("generate_epub3", e.control.value))
+
+        output_card = build_card(ft.Column([
+            build_section_header("Output", icon="audio_file", page=p),
+            labelled_row("Audio Format", format_dd, page=p),
+            labelled_row("Save Location", save_dd, page=p),
+            build_divider(p),
+            labelled_row("Save Chapters Separately", chapters_sw, page=p),
+            labelled_row("Merge at End", merge_sw, page=p),
+            labelled_row("Chapter Format", sep_fmt_dd, page=p),
+            labelled_row("Generate EPUB3", epub3_sw, page=p),
+        ], spacing=SPACE_MD), page=p)
+
+        # ── Text processing card ─────────────────────────────────────
+        newlines_sw = _sw(s.replace_single_newlines,
+                          lambda e: self._save("replace_single_newlines", e.control.value))
+        caps_sw = _sw(s.replace_all_caps, lambda e: self._save("replace_all_caps", e.control.value))
+        norm_sw = _sw(s.normalize_chapter_opening_caps,
+                      lambda e: self._save("normalize_chapter_opening_caps", e.control.value))
+        numerals_sw = _sw(s.replace_numerals, lambda e: self._save("replace_numerals", e.control.value))
+        punct_sw = _sw(s.fix_nonstandard_punctuation,
+                       lambda e: self._save("fix_nonstandard_punctuation", e.control.value))
+        wordsub_sw = _sw(s.word_substitutions_enabled,
+                         lambda e: self._save("word_substitutions_enabled", e.control.value))
+        wordsub_tf = ft.TextField(
+            value=s.word_substitutions_list,
+            multiline=True, min_lines=3, max_lines=6,
+            hint_text="word|replacement  (one per line)",
+            on_change=lambda e: self._save("word_substitutions_list", e.control.value),
+            expand=True, border_radius=RADIUS_SM, text_size=12,
+        )
+        case_sw = _sw(s.case_sensitive_substitutions,
+                      lambda e: self._save("case_sensitive_substitutions", e.control.value))
+        spacy_sw = _sw(s.use_spacy_segmentation,
+                       lambda e: self._save("use_spacy_segmentation", e.control.value))
+        chunk_dd = _dd(
+            [("paragraph", "Paragraph"), ("sentence", "Sentence")],
+            s.chunk_level,
+            lambda e: self._save("chunk_level", e.control.value),
+        )
+        title_intro_sw = _sw(s.read_title_intro, lambda e: self._save("read_title_intro", e.control.value))
+        outro_sw = _sw(s.read_closing_outro, lambda e: self._save("read_closing_outro", e.control.value))
+        prefix_sw = _sw(s.auto_prefix_chapter_titles,
+                        lambda e: self._save("auto_prefix_chapter_titles", e.control.value))
+
+        text_card = build_card(ft.Column([
+            build_section_header("Text Processing", icon="text_fields", page=p),
+            labelled_row("Replace Single Newlines", newlines_sw,
+                         tooltip="Replace single newlines with spaces before processing.", page=p),
+            labelled_row("Replace ALL CAPS Words", caps_sw, page=p),
+            labelled_row("Normalize Opening CAPS", norm_sw, page=p),
+            labelled_row("Replace Numerals (spoken)", numerals_sw, page=p),
+            labelled_row("Fix Non-standard Punctuation", punct_sw, page=p),
+            build_divider(p),
+            labelled_row("Word Substitutions", wordsub_sw, page=p),
+            labelled_row("Case Sensitive", case_sw, page=p),
+            ft.Text("Substitution rules  (word|replacement, one per line):",
+                    size=12, color=pal.text_secondary),
+            wordsub_tf,
+            build_divider(p),
+            build_section_header("Chapter Options", icon="library_books", page=p),
+            labelled_row("Announce Book Title (intro)", title_intro_sw, page=p),
+            labelled_row("Announce Book Title (outro)", outro_sw, page=p),
+            labelled_row("Auto-prefix Chapter Titles", prefix_sw, page=p),
+            labelled_row("Chunk Level", chunk_dd, page=p),
+            labelled_row("Use spaCy Segmentation", spacy_sw, page=p),
+        ], spacing=SPACE_MD), page=p)
+
+        # ── Subtitle card ─────────────────────────────────────────────
+        sub_modes = ["Disabled", "Line", "Sentence", "Sentence + Comma",
+                     "Sentence + Highlighting"] + [f"{i} word{'s' if i > 1 else ''}" for i in range(1, 11)]
+        sub_mode_dd = _dd(
+            [(m, m) for m in sub_modes],
+            s.subtitle_mode,
+            lambda e: self._save("subtitle_mode", e.control.value),
+        )
+        sub_fmt_dd = _dd(
+            [(k, lbl) for k, lbl in SUBTITLE_FORMATS],
+            s.subtitle_format,
+            lambda e: self._save("subtitle_format", e.control.value),
+        )
+
+        def _mk_mw_slider():
+            lbl = ft.Text(str(s.max_subtitle_words), size=12, width=36)
+            sl = ft.Slider(
+                min=1, max=200, value=s.max_subtitle_words, divisions=199, label="{value}",
+                expand=True,
+                on_change=lambda e: (self._save("max_subtitle_words", int(e.control.value)),
+                                     setattr(lbl, "value", str(int(e.control.value))),
+                                     self._page.update()),
+            )
+            return ft.Row([sl, lbl], expand=True, spacing=SPACE_SM)
+
+        sub_speed_dd = _dd(
+            [("tts", "TTS duration"), ("silence", "Silence detection")],
+            s.subtitle_speed_method,
+            lambda e: self._save("subtitle_speed_method", e.control.value),
+        )
+        silent_gaps_sw = _sw(s.use_silent_gaps,
+                             lambda e: self._save("use_silent_gaps", e.control.value))
+
+        subtitle_card = build_card(ft.Column([
+            build_section_header("Subtitles", icon="subtitles", page=p),
+            labelled_row("Mode", sub_mode_dd, page=p),
+            labelled_row("Format", sub_fmt_dd, page=p),
+            labelled_row("Max Words / Block", _mk_mw_slider(), page=p),
+            labelled_row("Speed Method", sub_speed_dd, page=p),
+            labelled_row("Silent Gaps", silent_gaps_sw, page=p),
+        ], spacing=SPACE_MD), page=p)
+
+        # ── Pipeline card ─────────────────────────────────────────────
+        provider_dd = _dd(
+            [("kokoro", "Kokoro (default)"), ("supertonic", "Supertonic")],
+            s.tts_provider,
+            lambda e: self._save("tts_provider", e.control.value),
+        )
+        gpu_sw = _sw(s.use_gpu, lambda e: self._save("use_gpu", e.control.value),
+                     label="GPU acceleration (if available)")
+
+        def _mk_steps_slider():
+            lbl = ft.Text(str(s.supertonic_total_steps), size=12, width=28)
+            sl = ft.Slider(
+                min=2, max=15, value=s.supertonic_total_steps, divisions=13,
+                label="{value}", expand=True,
+                on_change=lambda e: (self._save("supertonic_total_steps", int(e.control.value)),
+                                     setattr(lbl, "value", str(int(e.control.value))),
+                                     self._page.update()),
+            )
+            return ft.Row([sl, lbl], expand=True, spacing=SPACE_SM)
+
+        thresh_tf = ft.TextField(
+            value=str(s.speaker_analysis_threshold), width=80,
+            keyboard_type=ft.KeyboardType.NUMBER, border_radius=RADIUS_SM,
+            on_change=lambda e: self._save_int("speaker_analysis_threshold", e.control.value, 1, 25),
+        )
+        silence_tf = ft.TextField(
+            value=str(s.silence_duration), width=80,
+            keyboard_type=ft.KeyboardType.NUMBER, border_radius=RADIUS_SM,
+            on_change=lambda e: self._save_float("silence_duration", e.control.value, 0.0),
+        )
+        intro_tf = ft.TextField(
+            value=str(s.chapter_intro_delay), width=80,
+            keyboard_type=ft.KeyboardType.NUMBER, border_radius=RADIUS_SM,
+            on_change=lambda e: self._save_float("chapter_intro_delay", e.control.value, 0.0),
+        )
+
+        pipeline_card = build_card(ft.Column([
+            build_section_header("TTS Pipeline", icon="settings", page=p),
+            labelled_row("Provider", provider_dd, page=p),
+            labelled_row("GPU Acceleration", gpu_sw, page=p),
+            labelled_row("Supertonic Steps", _mk_steps_slider(), page=p),
+            build_divider(p),
+            labelled_row("Speaker Analysis Threshold", thresh_tf, page=p),
+            labelled_row("Silence Between Chapters (s)", silence_tf, page=p),
+            labelled_row("Chapter Intro Delay (s)", intro_tf, page=p),
+        ], spacing=SPACE_MD), page=p)
+
+        # ── Integration card (Audiobookshelf) ─────────────────────────
+        abs_enabled_sw = _sw(s.audiobookshelf_enabled,
+                             lambda e: self._save("audiobookshelf_enabled", e.control.value))
+        abs_url_tf = ft.TextField(value=s.audiobookshelf_base_url, hint_text="http://abs-server:13378",
+                                  expand=True, border_radius=RADIUS_SM, text_size=12,
+                                  on_change=lambda e: self._save("audiobookshelf_base_url", e.control.value))
+        abs_token_tf = ft.TextField(value=s.audiobookshelf_api_token, password=True,
+                                    can_reveal_password=True, expand=True,
+                                    border_radius=RADIUS_SM, text_size=12,
+                                    on_change=lambda e: self._save("audiobookshelf_api_token", e.control.value))
+        abs_lib_tf = ft.TextField(value=s.audiobookshelf_library_id, hint_text="Library ID",
+                                  expand=True, border_radius=RADIUS_SM, text_size=12,
+                                  on_change=lambda e: self._save("audiobookshelf_library_id", e.control.value))
+        abs_auto_sw = _sw(s.audiobookshelf_auto_send,
+                          lambda e: self._save("audiobookshelf_auto_send", e.control.value))
+
+        integ_card = build_card(ft.Column([
+            build_section_header("Audiobookshelf Integration",
+                                 icon="cloud_upload", page=p),
+            labelled_row("Enabled", abs_enabled_sw, page=p),
+            labelled_row("Server URL", abs_url_tf, page=p),
+            labelled_row("API Token", abs_token_tf, page=p),
+            labelled_row("Library ID", abs_lib_tf, page=p),
+            labelled_row("Auto-upload on finish", abs_auto_sw, page=p),
+        ], spacing=SPACE_MD), page=p)
+
+        save_btn = build_primary_button(
+            "Save Settings", icon="save",
+            on_click=self._on_save, page=p,
+        )
+
+        return ft.Column([
+            output_card,
+            ft.Container(height=SPACE_MD),
+            text_card,
+            ft.Container(height=SPACE_MD),
+            subtitle_card,
+            ft.Container(height=SPACE_MD),
+            pipeline_card,
+            ft.Container(height=SPACE_MD),
+            integ_card,
+            ft.Container(height=SPACE_LG),
+            save_btn,
+            ft.Container(height=SPACE_LG),
+        ], spacing=0, scroll=ft.ScrollMode.AUTO, expand=True)
+
+    # ------------------------------------------------------------------
+    # Helpers
+    # ------------------------------------------------------------------
+
+    def _save(self, attr: str, value) -> None:
+        setattr(self._state, attr, value)
+
+    def _save_int(self, attr: str, raw: str, lo: int, hi: int) -> None:
+        try:
+            v = max(lo, min(hi, int(raw)))
+            setattr(self._state, attr, v)
+        except ValueError:
+            pass
+
+    def _save_float(self, attr: str, raw: str, lo: float) -> None:
+        try:
+            v = max(lo, float(raw))
+            setattr(self._state, attr, v)
+        except ValueError:
+            pass
+
+    def _on_save(self, _: ft.ControlEvent) -> None:
+        self._state.persist_config()
+        show_snack(self._page, "Settings saved.")

abogen/predownload_gui.py

@@ -21,8 +21,7 @@ from PyQt6.QtWidgets import (
 )
 from PyQt6.QtCore import QThread, pyqtSignal
 
-from abogen.constants import COLORS
+from abogen.constants import COLORS, VOICES_INTERNAL
-from abogen.tts_plugin.utils import get_voices
 from abogen.spacy_utils import SPACY_MODELS
 import abogen.hf_tracker
 
@@ -115,7 +114,7 @@ class PreDownloadWorker(QThread):
             self._voices_success = False
             return
 
-        voice_list = get_voices("kokoro")
+        voice_list = VOICES_INTERNAL
         for idx, voice in enumerate(voice_list, start=1):
             if self._cancelled:
                 self._voices_success = False
@@ -463,14 +462,14 @@ class PreDownloadDialog(QDialog):
         try:
             from huggingface_hub import try_to_load_from_cache
 
-            for voice in get_voices("kokoro"):
+            for voice in VOICES_INTERNAL:
                 if not try_to_load_from_cache(
                     repo_id="hexgrad/Kokoro-82M", filename=f"voices/{voice}.pt"
                 ):
                     missing.append(voice)
         except Exception:
             # If HF missing, report all as missing
-            return False, list(get_voices("kokoro"))
+            return False, list(VOICES_INTERNAL)
         return (len(missing) == 0), missing
 
     def _check_kokoro_model(self) -> bool:

abogen/pyqt/conversion.py

@@ -5,7 +5,6 @@ import hashlib  # For generating unique cache filenames
 from platformdirs import user_desktop_dir
 from PyQt6.QtCore import QThread, pyqtSignal, Qt, QTimer
 from PyQt6.QtWidgets import QCheckBox, QVBoxLayout, QDialog, QLabel, QDialogButtonBox
-import numpy as np
 import soundfile as sf
 from abogen.utils import (
     create_process,
@@ -260,7 +259,8 @@ class ConversionThread(QThread):
         output_folder,
         subtitle_mode,
         output_format,
-        backend,
+        np_module,
+        kpipeline_class,
         start_time,
         total_char_count,
         use_gpu=True,
@@ -270,7 +270,8 @@ class ConversionThread(QThread):
         super().__init__()
         self._chapter_options_event = threading.Event()
         self._timestamp_response_event = threading.Event()
-        self.backend = backend
+        self.np = np_module
+        self.KPipeline = kpipeline_class
         self.file_name = file_name
         self.lang_code = lang_code
         self.speed = speed
@@ -489,6 +490,19 @@ class ConversionThread(QThread):
 
             self.log_updated.emit(("\nInitializing TTS pipeline...", "grey"))
 
+            # Set device based on use_gpu setting and platform
+            if self.use_gpu:
+                if platform.system() == "Darwin" and platform.processor() == "arm":
+                    device = "mps"  # Use MPS for Apple Silicon
+                else:
+                    device = "cuda"  # Use CUDA for other platforms
+            else:
+                device = "cpu"
+
+            tts = self.KPipeline(
+                lang_code=self.lang_code, repo_id="hexgrad/Kokoro-82M", device=device
+            )
+
             # Check if the input is a subtitle file or timestamp text file
             is_subtitle_file = False
             is_timestamp_text = False
@@ -524,7 +538,7 @@ class ConversionThread(QThread):
 
             # Process subtitle files separately
             if is_subtitle_file or is_timestamp_text:
-                self._process_subtitle_file(self.backend, base_path, is_timestamp_text)
+                self._process_subtitle_file(tts, base_path, is_timestamp_text)
                 return
 
             if self.is_direct_text:
@@ -1057,7 +1071,7 @@ class ConversionThread(QThread):
                 for segment_idx, (voice_name, segment_text) in enumerate(voice_segments):
                     # Load voice for this segment (with caching)
                     try:
-                        loaded_voice = self.load_voice_cached(voice_name, self.backend)
+                        loaded_voice = self.load_voice_cached(voice_name, tts)
                         if segment_idx > 0:
                             voice_display = voice_name if len(voice_name) < 50 else voice_name[:47] + "..."
                             self.log_updated.emit((f"  → Voice: {voice_display}", "grey"))
@@ -1066,7 +1080,7 @@ class ConversionThread(QThread):
                             (f"⚠ Voice loading error for '{voice_name}', continuing with previous", "orange")
                         )
                         if segment_idx == 0:
-                            loaded_voice = self.load_voice_cached(self.voice, self.backend)
+                            loaded_voice = self.load_voice_cached(self.voice, tts)
 
                     # Determine if spaCy segmentation should be used for PRE-TTS segmentation
                     # Only non-English languages use spaCy for pre-segmentation
@@ -1152,7 +1166,7 @@ class ConversionThread(QThread):
                         print("Using split pattern: (unprintable)")
 
                     for text_segment in text_segments:
-                        for result in self.backend(
+                        for result in tts(
                             text_segment,
                             voice=loaded_voice,
                             speed=self.speed,
@@ -1354,7 +1368,7 @@ class ConversionThread(QThread):
                     silence_samples = int(
                         self.silence_duration * 24000
                     )  # Silence duration at 24,000 Hz
-                    silence_audio = np.zeros(silence_samples, dtype="float32")
+                    silence_audio = self.np.zeros(silence_samples, dtype="float32")
                     silence_bytes = silence_audio.tobytes()
 
                     if merged_out_file:
@@ -1693,7 +1707,7 @@ class ConversionThread(QThread):
             max_end_time = max(
                 (end for _, end, _ in subtitles if end is not None), default=0
             )
-            audio_buffer = np.zeros(
+            audio_buffer = self.np.zeros(
                 int(max_end_time * rate) + rate, dtype="float32"
             )
 
@@ -1757,7 +1771,7 @@ class ConversionThread(QThread):
                 # Generate TTS audio
                 tts_results = [
                     r
-                    for r in self.backend(
+                    for r in tts(
                         processed_text,
                         voice=loaded_voice,
                         speed=self.speed,
@@ -1775,11 +1789,11 @@ class ConversionThread(QThread):
 
                 # Concatenate audio and determine duration
                 full_audio = (
-                    np.concatenate(
+                    self.np.concatenate(
                         [a.numpy() if hasattr(a, "numpy") else a for a in audio_chunks]
                     )
                     if audio_chunks
-                    else np.zeros(
+                    else self.np.zeros(
                         int((subtitle_duration or 0) * rate), dtype="float32"
                     )
                 )
@@ -1813,8 +1827,8 @@ class ConversionThread(QThread):
                         num_stages = max(
                             1,
                             int(
-                                np.ceil(
+                                self.np.ceil(
-                                    np.log(speed_factor) / np.log(2.0)
+                                    self.np.log(speed_factor) / self.np.log(2.0)
                                 )
                             ),
                         )
@@ -1847,7 +1861,7 @@ class ConversionThread(QThread):
                             stdout=subprocess.PIPE,
                             stderr=subprocess.PIPE,
                         )
-                        full_audio = np.frombuffer(
+                        full_audio = self.np.frombuffer(
                             speed_proc.communicate(input=full_audio.tobytes())[0],
                             dtype="float32",
                         )
@@ -1861,7 +1875,7 @@ class ConversionThread(QThread):
 
                         tts_results = [
                             r
-                            for r in self.backend(
+                            for r in tts(
                                 processed_text,
                                 voice=loaded_voice,
                                 speed=new_speed,
@@ -1872,14 +1886,14 @@ class ConversionThread(QThread):
                         audio_chunks = [r.audio for r in tts_results]
 
                         full_audio = (
-                            np.concatenate(
+                            self.np.concatenate(
                                 [
                                     a.numpy() if hasattr(a, "numpy") else a
                                     for a in audio_chunks
                                 ]
                             )
                             if audio_chunks
-                            else np.zeros(
+                            else self.np.zeros(
                                 int(subtitle_duration * rate), dtype="float32"
                             )
                         )
@@ -1896,10 +1910,10 @@ class ConversionThread(QThread):
                 # Pad or trim to subtitle duration
                 target_samples = int(subtitle_duration * rate)
                 if len(full_audio) < target_samples:
-                    full_audio = np.concatenate(
+                    full_audio = self.np.concatenate(
                         [
                             full_audio,
-                            np.zeros(
+                            self.np.zeros(
                                 target_samples - len(full_audio), dtype="float32"
                             ),
                         ]
@@ -1912,10 +1926,10 @@ class ConversionThread(QThread):
                 end_sample = start_sample + len(full_audio)
                 if end_sample > len(audio_buffer):
                     # Extend buffer if needed
-                    audio_buffer = np.concatenate(
+                    audio_buffer = self.np.concatenate(
                         [
                             audio_buffer,
-                            np.zeros(
+                            self.np.zeros(
                                 end_sample - len(audio_buffer), dtype="float32"
                             ),
                         ]
@@ -1957,7 +1971,7 @@ class ConversionThread(QThread):
                 self.progress_updated.emit(percent, etr_str)
 
             # Normalize audio buffer to prevent clipping from mixed overlaps
-            max_amplitude = np.abs(audio_buffer).max()
+            max_amplitude = self.np.abs(audio_buffer).max()
             if max_amplitude > 1.0:
                 self.log_updated.emit(
                     f"\n  -> Normalizing audio (peak: {max_amplitude:.2f})"
@@ -2426,7 +2440,8 @@ class VoicePreviewThread(QThread):
 
     def __init__(
         self,
-        backend,
+        np_module,
+        kpipeline_class,
         lang_code,
         voice,
         speed,
@@ -2434,7 +2449,8 @@ class VoicePreviewThread(QThread):
         parent=None,
     ):
         super().__init__(parent)
-        self.backend = backend
+        self.np_module = np_module
+        self.kpipeline_class = kpipeline_class
         self.lang_code = lang_code
         self.voice = voice
         self.speed = speed
@@ -2468,19 +2484,31 @@ class VoicePreviewThread(QThread):
         # Generate the preview and save to cache
         try:
 
+            # Set device based on use_gpu setting and platform
+            if self.use_gpu:
+                if platform.system() == "Darwin" and platform.processor() == "arm":
+                    device = "mps"  # Use MPS for Apple Silicon
+                else:
+                    device = "cuda"  # Use CUDA for other platforms
+            else:
+                device = "cpu"
+
+            tts = self.kpipeline_class(
+                lang_code=self.lang_code, repo_id="hexgrad/Kokoro-82M", device=device
+            )
             # Enable voice formula support for preview
             if "*" in self.voice:
-                loaded_voice = get_new_voice(self.backend, self.voice, self.use_gpu)
+                loaded_voice = get_new_voice(tts, self.voice, self.use_gpu)
             else:
                 loaded_voice = self.voice
             sample_text = get_sample_voice_text(self.lang_code)
             audio_segments = []
-            for result in self.backend(
+            for result in tts(
                 sample_text, voice=loaded_voice, speed=self.speed, split_pattern=None
             ):
                 audio_segments.append(result.audio)
             if audio_segments:
-                audio = np.concatenate(audio_segments)
+                audio = self.np_module.concatenate(audio_segments)
                 # Save directly to the cache path
                 sf.write(self.cache_path, audio, 24000)
                 self.temp_wav = self.cache_path

abogen/pyqt/gui.py

@@ -82,11 +82,11 @@ from abogen.constants import (
     GITHUB_URL,
     PROGRAM_DESCRIPTION,
     LANGUAGE_DESCRIPTIONS,
+    VOICES_INTERNAL,
     SUPPORTED_LANGUAGES_FOR_SUBTITLE_GENERATION,
     COLORS,
     SUBTITLE_FORMATS,
 )
-from abogen.tts_plugin.utils import get_voices
 import threading
 from abogen.pyqt.voice_formula_gui import VoiceFormulaDialog
 from abogen.voice_profiles import load_profiles
@@ -1873,7 +1873,7 @@ class abogen(QWidget):
         for pname in load_profiles().keys():
             self.voice_combo.addItem(profile_icon, pname, f"profile:{pname}")
         # re-add voices
-        for v in get_voices("kokoro"):
+        for v in VOICES_INTERNAL:
             icon = QIcon()
             flag_path = get_resource_path("abogen.assets.flags", f"{v[0]}.png")
             if flag_path and os.path.exists(flag_path):
@@ -2316,9 +2316,9 @@ class abogen(QWidget):
             file_size_str = "Unknown"
 
         # pipeline_loaded_callback remains unchanged
-        def pipeline_loaded_callback(backend, error):
+        def pipeline_loaded_callback(np_module, kpipeline_class, error):
             if error:
-                self.update_log((f"Error loading TTS backend: {error}", "red"))
+                self.update_log((f"Error loading numpy or KPipeline: {error}", "red"))
                 prevent_sleep_end()
                 return
 
@@ -2341,7 +2341,8 @@ class abogen(QWidget):
                 self.selected_output_folder,
                 subtitle_mode=actual_subtitle_mode,
                 output_format=self.selected_format,
-                backend=backend,
+                np_module=np_module,
+                kpipeline_class=kpipeline_class,
                 start_time=self.start_time,
                 total_char_count=self.char_count,
                 use_gpu=self.gpu_ok,
@@ -2425,20 +2426,7 @@ class abogen(QWidget):
             self.gpu_ok = gpu_ok
             self.update_log((gpu_msg, gpu_ok))
             self.update_log("Loading modules...")
-
+            load_thread = LoadPipelineThread(pipeline_loaded_callback)
-            # Determine device based on GPU availability
-            if gpu_ok:
-                if platform.system() == "Darwin" and platform.processor() == "arm":
-                    device = "mps"
-                else:
-                    device = "cuda"
-            else:
-                device = "cpu"
-
-            lang_code = self.selected_lang or "a"
-            load_thread = LoadPipelineThread(
-                pipeline_loaded_callback, lang_code=lang_code, device=device
-            )
             load_thread.start()
 
         threading.Thread(target=gpu_and_load, daemon=True).start()
@@ -2875,27 +2863,18 @@ class abogen(QWidget):
             )
             self.loading_movie.start()
 
-        # Determine device based on GPU availability
+        def pipeline_loaded_callback(np_module, kpipeline_class, error):
-        if self.gpu_ok:
+            self._on_pipeline_loaded_for_preview(np_module, kpipeline_class, error)
-            if platform.system() == "Darwin" and platform.processor() == "arm":
-                device = "mps"
-            else:
-                device = "cuda"
-        else:
-            device = "cpu"
 
-        lang = self.selected_lang or "a"
+        load_thread = LoadPipelineThread(pipeline_loaded_callback)
-        load_thread = LoadPipelineThread(
-            self._on_pipeline_loaded_for_preview, lang_code=lang, device=device
-        )
         load_thread.start()
 
-    def _on_pipeline_loaded_for_preview(self, backend, error):
+    def _on_pipeline_loaded_for_preview(self, np_module, kpipeline_class, error):
         # stop loading animation and restore icon on error
         if error:
             self.loading_movie.stop()
             self._show_error_message_box(
-                "Loading Error", f"Error loading TTS backend: {error}"
+                "Loading Error", f"Error loading numpy or KPipeline: {error}"
             )
             self.btn_preview.setIcon(self.play_icon)
             self.btn_preview.setEnabled(True)
@@ -2933,7 +2912,7 @@ class abogen(QWidget):
         gpu_msg, gpu_ok = get_gpu_acceleration(self.use_gpu)
 
         self.preview_thread = VoicePreviewThread(
-            backend, lang, voice, speed, gpu_ok
+            np_module, kpipeline_class, lang, voice, speed, gpu_ok
         )
         self.preview_thread.finished.connect(self._play_preview_audio)
         self.preview_thread.error.connect(self._preview_error)

abogen/pyqt/predownload_gui.py

@@ -21,8 +21,7 @@ from PyQt6.QtWidgets import (
 )
 from PyQt6.QtCore import QThread, pyqtSignal
 
-from abogen.constants import COLORS
+from abogen.constants import COLORS, VOICES_INTERNAL
-from abogen.tts_plugin.utils import get_voices
 from abogen.spacy_utils import SPACY_MODELS
 import abogen.hf_tracker
 
@@ -115,7 +114,7 @@ class PreDownloadWorker(QThread):
             self._voices_success = False
             return
 
-        voice_list = get_voices("kokoro")
+        voice_list = VOICES_INTERNAL
         for idx, voice in enumerate(voice_list, start=1):
             if self._cancelled:
                 self._voices_success = False
@@ -463,14 +462,14 @@ class PreDownloadDialog(QDialog):
         try:
             from huggingface_hub import try_to_load_from_cache
 
-            for voice in get_voices("kokoro"):
+            for voice in VOICES_INTERNAL:
                 if not try_to_load_from_cache(
                     repo_id="hexgrad/Kokoro-82M", filename=f"voices/{voice}.pt"
                 ):
                     missing.append(voice)
         except Exception:
             # If HF missing, report all as missing
-            return False, list(get_voices("kokoro"))
+            return False, list(VOICES_INTERNAL)
         return (len(missing) == 0), missing
 
     def _check_kokoro_model(self) -> bool:

abogen/pyqt/voice_formula_gui.py

@@ -28,11 +28,11 @@ from PyQt6.QtWidgets import (
 from PyQt6.QtCore import Qt, QTimer, QPoint, QRect, QSize
 from PyQt6.QtGui import QPixmap, QIcon, QAction
 from abogen.constants import (
+    VOICES_INTERNAL,
     SUPPORTED_LANGUAGES_FOR_SUBTITLE_GENERATION,
     LANGUAGE_DESCRIPTIONS,
     COLORS,
 )
-from abogen.tts_plugin.utils import get_voices
 import re
 import platform
 from abogen.utils import get_resource_path
@@ -179,7 +179,7 @@ class VoiceMixer(QWidget):
         layout.addWidget(QLabel(name), alignment=Qt.AlignmentFlag.AlignCenter)
 
         # Voice name label with gender icon
-        is_female = self.voice_name in get_voices("kokoro") and self.voice_name[1] == "f"
+        is_female = self.voice_name in VOICES_INTERNAL and self.voice_name[1] == "f"
 
         # Icons layout (flag and gender)
         icons_layout = QHBoxLayout()
@@ -772,7 +772,7 @@ class VoiceFormulaDialog(QDialog):
 
     def add_voices(self, initial_state):
         first_enabled_voice = None
-        for voice in get_voices("kokoro"):
+        for voice in VOICES_INTERNAL:
             language_code = voice[0]  # First character is the language code
             matching_voice = next(
                 (item for item in initial_state if item[0] == voice), None

abogen/subtitle_utils.py

@@ -466,7 +466,7 @@ def sanitize_name_for_os(name, is_folder=True):
 
 
 def validate_voice_name(voice_name):
-    """Validate voice name against available voices (case-insensitive).
+    """Validate voice name against VOICES_INTERNAL list (case-insensitive).
     Handles both single voices and formulas like 'af_heart*0.5 + am_echo*0.5'.
 
     Args:
@@ -477,10 +477,10 @@ def validate_voice_name(voice_name):
             - is_valid: True if all voices in the name/formula are valid
             - invalid_voice_name: The first invalid voice found, or None if all valid
     """
-    from abogen.tts_plugin.utils import get_voices
+    from abogen.constants import VOICES_INTERNAL
 
     # Create case-insensitive lookup set (done once per call)
-    voice_lookup_lower = {v.lower() for v in get_voices("kokoro")}
+    voice_lookup_lower = {v.lower() for v in VOICES_INTERNAL}
     voice_name = voice_name.strip()
 
     # Check if it's a formula (contains *)
@@ -505,7 +505,7 @@ def split_text_by_voice_markers(text, default_voice):
     """Split text by voice markers, returning list of (voice, text) tuples.
 
     IMPORTANT: Returns the last voice used so it can persist across chapters.
-    Voice names are normalized to lowercase to match canonical voice names.
+    Voice names are normalized to lowercase to match VOICES_INTERNAL.
 
     Args:
         text: Text potentially containing <<VOICE:name>> markers
@@ -518,7 +518,7 @@ def split_text_by_voice_markers(text, default_voice):
             - valid_count: Number of valid voice markers processed
             - invalid_count: Number of invalid voice markers skipped
     """
-    from abogen.tts_plugin.utils import get_voices
+    from abogen.constants import VOICES_INTERNAL
 
     voice_splits = list(_VOICE_MARKER_SEARCH_PATTERN.finditer(text))
 
@@ -560,7 +560,7 @@ def split_text_by_voice_markers(text, default_voice):
                         # Find the canonical (lowercase) voice name
                         voice_part_lower = voice_part.strip().lower()
                         canonical_voice = next(
-                            (v for v in get_voices("kokoro") if v.lower() == voice_part_lower),
+                            (v for v in VOICES_INTERNAL if v.lower() == voice_part_lower),
                             voice_part.strip()
                         )
                         normalized_parts.append(f"{canonical_voice}*{weight.strip()}")
@@ -569,7 +569,7 @@ def split_text_by_voice_markers(text, default_voice):
                 # Find the canonical (lowercase) voice name
                 voice_name_lower = voice_name.lower()
                 current_voice = next(
-                    (v for v in get_voices("kokoro") if v.lower() == voice_name_lower),
+                    (v for v in VOICES_INTERNAL if v.lower() == voice_name_lower),
                     voice_name
                 )
             valid_markers += 1

abogen/tts_plugin/__init__.py

@@ -1,170 +0,0 @@
-"""TTS Plugin Architecture - Public API.
-
-This package defines the frozen Plugin API for the TTS Plugin Architecture.
-All public interfaces are fully defined but contain no business logic.
-
-Public modules:
-- types: Core domain value objects (AudioFormat, Duration, VoiceSelection, etc.)
-- errors: Error hierarchy (EngineError and subtypes)
-- manifest: Plugin manifest types (PluginManifest, EngineManifest, etc.)
-- engine: Engine and EngineSession protocols
-- capabilities: Optional capability interfaces (VoiceLister, PreviewGenerator, etc.)
-- host_context: HostContext dataclass
-- plugin: Plugin contract (create_engine function signature)
-- loader: Plugin discovery and loading
-- plugin_manager: Plugin management and engine creation
-- utils: Direct utility functions (get_voices, create_pipeline, etc.)
-
-Usage:
-    from abogen.tts_plugin import (
-        # Types
-        AudioFormat,
-        Duration,
-        VoiceSelection,
-        ParameterValues,
-        SynthesisRequest,
-        SynthesizedAudio,
-        EngineConfig,
-        # Errors
-        EngineError,
-        ModelNotFoundError,
-        ModelLoadError,
-        NetworkError,
-        InvalidInputError,
-        ConfigurationError,
-        CancelledError,
-        InternalError,
-        # Manifest
-        PluginManifest,
-        EngineManifest,
-        VoiceSourceManifest,
-        VoiceManifest,
-        ParameterManifest,
-        AudioFormatManifest,
-        EnumOption,
-        RequirementManifest,
-        GpuRequirement,
-        ModelManifest,
-        # Engine
-        Engine,
-        EngineSession,
-        # Capabilities
-        VoiceLister,
-        PreviewGenerator,
-        StreamingSynthesizer,
-        CancelableSession,
-        # Host Context
-        HostContext,
-        HttpClient,
-        # Plugin Manager
-        get_plugin_manager,
-        reset_plugin_manager,
-        # Utils
-        get_voices,
-        get_default_voice,
-        is_plugin_registered,
-        resolve_voice_to_plugin,
-        create_pipeline,
-    )
-"""
-
-from abogen.tts_plugin.capabilities import (
-    CancelableSession,
-    PreviewGenerator,
-    StreamingSynthesizer,
-    VoiceLister,
-)
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.errors import (
-    CancelledError,
-    ConfigurationError,
-    EngineError,
-    InternalError,
-    InvalidInputError,
-    ModelLoadError,
-    ModelNotFoundError,
-    NetworkError,
-)
-from abogen.tts_plugin.host_context import HttpClient, HostContext
-from abogen.tts_plugin.manifest import (
-    AudioFormatManifest,
-    EngineManifest,
-    EnumOption,
-    GpuRequirement,
-    ModelManifest,
-    ParameterManifest,
-    PluginManifest,
-    RequirementManifest,
-    VoiceManifest,
-    VoiceSourceManifest,
-)
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    Duration,
-    EngineConfig,
-    ParameterValues,
-    SynthesisRequest,
-    SynthesizedAudio,
-    VoiceSelection,
-)
-
-# Plugin Manager and Utils
-from abogen.tts_plugin.plugin_manager import get_plugin_manager, reset_plugin_manager
-from abogen.tts_plugin.utils import (
-    create_pipeline,
-    get_default_voice,
-    get_voices,
-    is_plugin_registered,
-    resolve_voice_to_plugin,
-)
-
-__all__ = [
-    # Types
-    "AudioFormat",
-    "Duration",
-    "VoiceSelection",
-    "ParameterValues",
-    "SynthesisRequest",
-    "SynthesizedAudio",
-    "EngineConfig",
-    # Errors
-    "EngineError",
-    "ModelNotFoundError",
-    "ModelLoadError",
-    "NetworkError",
-    "InvalidInputError",
-    "ConfigurationError",
-    "CancelledError",
-    "InternalError",
-    # Manifest
-    "PluginManifest",
-    "EngineManifest",
-    "VoiceSourceManifest",
-    "VoiceManifest",
-    "ParameterManifest",
-    "AudioFormatManifest",
-    "EnumOption",
-    "RequirementManifest",
-    "GpuRequirement",
-    "ModelManifest",
-    # Engine
-    "Engine",
-    "EngineSession",
-    # Capabilities
-    "VoiceLister",
-    "PreviewGenerator",
-    "StreamingSynthesizer",
-    "CancelableSession",
-    # Host Context
-    "HostContext",
-    "HttpClient",
-    # Plugin Manager
-    "get_plugin_manager",
-    "reset_plugin_manager",
-    # Utils
-    "get_voices",
-    "get_default_voice",
-    "is_plugin_registered",
-    "resolve_voice_to_plugin",
-    "create_pipeline",
-]

abogen/tts_plugin/capabilities.py

@@ -1,103 +0,0 @@
-"""Capability interfaces for the TTS Plugin Architecture.
-
-This module defines optional capability interfaces that engines can implement.
-Capabilities are additive; implementing new capabilities doesn't break old plugins.
-"""
-
-from __future__ import annotations
-
-from typing import Iterator, Protocol, runtime_checkable
-
-from abogen.tts_plugin.manifest import VoiceManifest
-from abogen.tts_plugin.types import SynthesisRequest, SynthesizedAudio, VoiceSelection
-
-
-@runtime_checkable
-class VoiceLister(Protocol):
-    """Protocol for listing available voices.
-
-    Engines that support voice listing should implement this interface.
-    """
-
-    def listVoices(self, sourceId: str) -> list[VoiceManifest]:
-        """List available voices for a given source.
-
-        Args:
-            sourceId: The voice source identifier.
-
-        Returns:
-            List of VoiceManifest describing available voices.
-
-        Raises:
-            EngineError: On failure.
-        """
-        ...
-
-
-@runtime_checkable
-class PreviewGenerator(Protocol):
-    """Protocol for generating voice previews.
-
-    Engines that support voice preview should implement this interface.
-    """
-
-    def generatePreview(self, voice: VoiceSelection, text: str) -> SynthesizedAudio:
-        """Generate a preview audio for a voice.
-
-        Args:
-            voice: Voice selection for the preview.
-            text: Text to use for the preview.
-
-        Returns:
-            SynthesizedAudio with the preview audio data.
-
-        Raises:
-            EngineError: On failure.
-        """
-        ...
-
-
-@runtime_checkable
-class StreamingSynthesizer(Protocol):
-    """Protocol for streaming synthesis.
-
-    Optional capability of EngineSession, not Engine.
-    Engines that support streaming synthesis should implement this interface.
-    """
-
-    def synthesizeStream(self, request: SynthesisRequest) -> Iterator[bytes]:
-        """Synthesize audio in streaming mode.
-
-        Args:
-            request: The synthesis request.
-
-        Yields:
-            Audio chunks as they become available.
-
-        Raises:
-            CancelledError: If cancel() is called during iteration.
-            EngineError: On synthesis failure.
-        """
-        ...
-        # This is a generator function; implementation will use yield
-        yield b""  # pragma: no cover
-
-
-@runtime_checkable
-class CancelableSession(Protocol):
-    """Protocol for cancellation support.
-
-    Optional capability for engines that support cancellation.
-    cancel() causes synthesize() to raise CancelledError.
-    """
-
-    def cancel(self) -> None:
-        """Cancel in-progress synthesis.
-
-        After cancellation, synthesize() raises CancelledError.
-        The session remains usable after cancellation.
-
-        Raises:
-            EngineError: If called after dispose().
-        """
-        ...

abogen/tts_plugin/engine.py

@@ -1,95 +0,0 @@
-"""Engine interfaces for the TTS Plugin Architecture.
-
-This module defines the core Engine and EngineSession protocols.
-These are the primary interfaces that plugin implementations must satisfy.
-"""
-
-from __future__ import annotations
-
-from typing import Protocol, runtime_checkable
-
-from abogen.tts_plugin.types import SynthesisRequest, SynthesizedAudio
-
-
-@runtime_checkable
-class EngineSession(Protocol):
-    """Protocol for a session that owns mutable execution state.
-
-    An EngineSession is created by Engine.createSession() and owns
-    mutable execution state isolated from other concurrent work.
-    It is NOT thread-safe.
-
-    Lifecycle:
-        1. Created by Engine.createSession()
-        2. Used for synthesis via synthesize()
-        3. Disposed via dispose()
-
-    After dispose(), all methods except dispose() raise EngineError.
-    """
-
-    def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio:
-        """Synthesize audio from text.
-
-        Args:
-            request: The synthesis request containing text, voice, parameters, and format.
-
-        Returns:
-            SynthesizedAudio with the synthesized audio data.
-
-        Raises:
-            EngineError: On synthesis failure. Session remains usable after error.
-            EngineError: If called after dispose().
-        """
-        ...
-
-    def dispose(self) -> None:
-        """Release session resources.
-
-        This method is idempotent and safe to call multiple times.
-        It never raises exceptions (catches and logs internally).
-        After dispose(), all methods except dispose() raise EngineError.
-        """
-        ...
-
-
-@runtime_checkable
-class Engine(Protocol):
-    """Protocol for a TTS engine that creates sessions.
-
-    An Engine is a factory for EngineSession instances. It is stateless
-    and thread-safe for createSession().
-
-    Lifecycle:
-        1. Created via create_engine() (plugin contract)
-        2. Sessions created via createSession()
-        3. Disposed via dispose()
-
-    Thread Safety:
-        - createSession() is thread-safe and can be called from any thread.
-        - dispose() must be called after all sessions are disposed.
-        - Disposing engine while sessions are alive violates API contract.
-    """
-
-    def createSession(self) -> EngineSession:
-        """Create a new session for synthesis.
-
-        Returns:
-            A new EngineSession instance. Ownership transfers to caller.
-
-        Raises:
-            EngineError: On failure. No partially initialized session is returned.
-        """
-        ...
-
-    def dispose(self) -> None:
-        """Release engine resources.
-
-        Caller must ensure all sessions created by this engine are disposed
-        before calling dispose(). Disposing an engine while any session is
-        still alive violates the API contract; behavior is undefined.
-
-        This method is idempotent and safe to call multiple times.
-        It never raises exceptions (catches and logs internally).
-        After dispose(), all methods except dispose() raise EngineError.
-        """
-        ...

abogen/tts_plugin/errors.py

@@ -1,62 +0,0 @@
-"""Error hierarchy for the TTS Plugin Architecture.
-
-This module defines typed exceptions that engines raise.
-Engines should never raise raw exceptions; they must use EngineError or its subtypes.
-"""
-
-from __future__ import annotations
-
-
-class EngineError(Exception):
-    """Base exception for all engine errors.
-
-    All engine operations that can fail should raise EngineError or one of its subtypes.
-    After dispose(), all methods except dispose() raise EngineError.
-    """
-
-    pass
-
-
-class ModelNotFoundError(EngineError):
-    """Raised when a required model is not found."""
-
-    pass
-
-
-class ModelLoadError(EngineError):
-    """Raised when a model fails to load."""
-
-    pass
-
-
-class NetworkError(EngineError):
-    """Raised when a network operation fails."""
-
-    pass
-
-
-class InvalidInputError(EngineError):
-    """Raised when invalid input is provided to the engine."""
-
-    pass
-
-
-class ConfigurationError(EngineError):
-    """Raised when there is a configuration error."""
-
-    pass
-
-
-class CancelledError(EngineError):
-    """Raised when an operation is cancelled.
-
-    This is raised by synthesize() when cancel() is called during synthesis.
-    """
-
-    pass
-
-
-class InternalError(EngineError):
-    """Raised when an internal engine error occurs."""
-
-    pass

abogen/tts_plugin/host_context.py

@@ -1,46 +0,0 @@
-"""Host context for the TTS Plugin Architecture.
-
-This module defines the HostContext dataclass that provides minimal
-host services to plugins. It is the only interface through which
-plugins can access host functionality.
-"""
-
-from __future__ import annotations
-
-import logging
-from dataclasses import dataclass
-from pathlib import Path
-from typing import Protocol, runtime_checkable
-
-
-@runtime_checkable
-class HttpClient(Protocol):
-    """Protocol for HTTP client provided by host.
-
-    Plugins can use this for network requests (e.g., API-based engines).
-    """
-
-    def get(self, url: str, **kwargs: object) -> object:
-        """Perform an HTTP GET request."""
-        ...
-
-    def post(self, url: str, **kwargs: object) -> object:
-        """Perform an HTTP POST request."""
-        ...
-
-
-@dataclass(frozen=True)
-class HostContext:
-    """Minimal host context provided to plugins.
-
-    Contains only essential host services. No business logic.
-
-    Attributes:
-        config_dir: Directory for API keys, preferences, and configuration.
-        logger: Logger for plugin logging.
-        http_client: HTTP client for network requests.
-    """
-
-    config_dir: Path
-    logger: logging.Logger
-    http_client: HttpClient

abogen/tts_plugin/loader.py

@@ -1,365 +0,0 @@
-"""Plugin loader infrastructure for the TTS Plugin Architecture.
-
-This module provides functionality to discover, import, validate, and load
-TTS plugins. It handles both valid and invalid plugins, providing diagnostic
-messages for errors.
-
-The loader does NOT:
-- Create Engine instances (that's the plugin's create_engine() responsibility)
-- Manage plugin lifecycle (that's the Plugin Manager's responsibility)
-- Implement any TTS engine functionality
-"""
-
-from __future__ import annotations
-
-import importlib
-import re
-import sys
-import types
-from dataclasses import dataclass, field
-from pathlib import Path
-from typing import Any, Callable
-
-from abogen.tts_plugin.manifest import ModelManifest, PluginManifest
-
-
-# Host API version for compatibility checking
-HOST_API_VERSION = "1.0"
-
-
-@dataclass(frozen=True)
-class PluginLoadError:
-    """Diagnostic information for a failed plugin load.
-
-    Attributes:
-        plugin_id: Plugin identifier if available, otherwise directory name.
-        path: Path to the plugin directory.
-        errors: List of error messages describing what went wrong.
-    """
-
-    plugin_id: str
-    path: Path
-    errors: tuple[str, ...] = field(default_factory=tuple)
-
-
-@dataclass(frozen=True)
-class PluginLoadResult:
-    """Result of loading a plugin.
-
-    Attributes:
-        success: Whether the plugin loaded successfully.
-        manifest: The plugin manifest if successful.
-        model_requirements: Model requirements if successful.
-        create_engine: The create_engine function if successful.
-        module: The plugin module if successful.
-        error: Error information if failed.
-    """
-
-    success: bool
-    manifest: PluginManifest | None = None
-    model_requirements: tuple[ModelManifest, ...] | None = None
-    create_engine: Callable[..., Any] | None = None
-    module: types.ModuleType | None = None
-    error: PluginLoadError | None = None
-
-
-def _parse_api_version(version: str) -> tuple[int, int] | None:
-    """Parse an api_version string into (major, minor) tuple.
-
-    Args:
-        version: Version string in format "MAJOR.MINOR".
-
-    Returns:
-        Tuple of (major, minor) or None if invalid format.
-    """
-    match = re.match(r"^(\d+)\.(\d+)$", version)
-    if match:
-        return int(match.group(1)), int(match.group(2))
-    return None
-
-
-def _check_api_version_compatibility(plugin_version: str) -> str | None:
-    """Check if plugin api_version is compatible with host.
-
-    Architecture spec:
-    - Format: semver (MAJOR.MINOR)
-    - Compatibility: Host rejects plugin if major version differs
-    - Minor version: backward compatible, Host accepts higher minor
-
-    Args:
-        plugin_version: Plugin's api_version string.
-
-    Returns:
-        Error message if incompatible, None if compatible.
-    """
-    plugin_ver = _parse_api_version(plugin_version)
-    if plugin_ver is None:
-        return f"Invalid api_version format: '{plugin_version}'. Expected format: MAJOR.MINOR"
-
-    host_ver = _parse_api_version(HOST_API_VERSION)
-    if host_ver is None:
-        return f"Invalid host api_version format: '{HOST_API_VERSION}'"
-
-    if plugin_ver[0] != host_ver[0]:
-        return (
-            f"api_version major mismatch: plugin={plugin_ver[0]}, host={host_ver[0]}. "
-            f"Major version must match for compatibility."
-        )
-
-    return None
-
-
-def _validate_manifest(module: types.ModuleType, plugin_dir: Path) -> list[str]:
-    """Validate that a plugin module has required exports.
-
-    Args:
-        module: The imported plugin module.
-        plugin_dir: Path to the plugin directory.
-
-    Returns:
-        List of error messages (empty if valid).
-    """
-    errors: list[str] = []
-
-    # Check PLUGIN_MANIFEST
-    manifest = getattr(module, "PLUGIN_MANIFEST", None)
-    if manifest is None:
-        errors.append("Missing PLUGIN_MANIFEST export")
-    elif not isinstance(manifest, PluginManifest):
-        errors.append(
-            f"PLUGIN_MANIFEST must be a PluginManifest instance, "
-            f"got {type(manifest).__name__}"
-        )
-
-    # Check MODEL_REQUIREMENTS
-    model_reqs = getattr(module, "MODEL_REQUIREMENTS", None)
-    if model_reqs is None:
-        errors.append("Missing MODEL_REQUIREMENTS export")
-    elif not isinstance(model_reqs, list):
-        errors.append(
-            f"MODEL_REQUIREMENTS must be a list, got {type(model_reqs).__name__}"
-        )
-    else:
-        for i, req in enumerate(model_reqs):
-            if not isinstance(req, ModelManifest):
-                errors.append(
-                    f"MODEL_REQUIREMENTS[{i}] must be a ModelManifest instance, "
-                    f"got {type(req).__name__}"
-                )
-
-    # Check create_engine
-    create_engine = getattr(module, "create_engine", None)
-    if create_engine is None:
-        errors.append("Missing create_engine export")
-    elif not callable(create_engine):
-        errors.append(
-            f"create_engine must be callable, got {type(create_engine).__name__}"
-        )
-
-    return errors
-
-
-def _validate_capabilities(manifest: PluginManifest) -> list[str]:
-    """Validate plugin capabilities.
-
-    Args:
-        manifest: The plugin manifest to validate.
-
-    Returns:
-        List of error messages (empty if valid).
-    """
-    errors: list[str] = []
-
-    # Known capabilities (can be extended)
-    known_capabilities = frozenset({
-        "voice_list",
-        "preview",
-        "voice_clone",
-        "voice_blend",
-        "streaming",
-        "cancel",
-    })
-
-    for cap in manifest.capabilities:
-        if cap not in known_capabilities:
-            errors.append(f"Unknown capability: '{cap}'")
-
-    return errors
-
-
-def _validate_api_version(manifest: PluginManifest) -> list[str]:
-    """Validate api_version compatibility.
-
-    Args:
-        manifest: The plugin manifest to validate.
-
-    Returns:
-        List of error messages (empty if valid).
-    """
-    errors: list[str] = []
-    error = _check_api_version_compatibility(manifest.api_version)
-    if error:
-        errors.append(error)
-    return errors
-
-
-def load_plugin_from_dir(plugin_dir: Path) -> PluginLoadResult:
-    """Load and validate a plugin from a directory.
-
-    The plugin directory must contain an __init__.py that exports:
-    - PLUGIN_MANIFEST: PluginManifest
-    - MODEL_REQUIREMENTS: list[ModelManifest]
-    - create_engine: Callable
-
-    Args:
-        plugin_dir: Path to the plugin directory.
-
-    Returns:
-        PluginLoadResult with success status and either plugin data or error info.
-    """
-    plugin_id = plugin_dir.name
-    errors: list[str] = []
-
-    # Check if directory exists
-    if not plugin_dir.exists():
-        return PluginLoadResult(
-            success=False,
-            error=PluginLoadError(
-                plugin_id=plugin_id,
-                path=plugin_dir,
-                errors=(f"Plugin directory does not exist: {plugin_dir}",),
-            ),
-        )
-
-    # Check for __init__.py
-    init_file = plugin_dir / "__init__.py"
-    if not init_file.exists():
-        return PluginLoadResult(
-            success=False,
-            error=PluginLoadError(
-                plugin_id=plugin_id,
-                path=plugin_dir,
-                errors=("Missing __init__.py in plugin directory",),
-            ),
-        )
-
-    # Import the module
-    module_name = f"abogen.tts_plugin._loaded.{plugin_id}"
-    try:
-        # Remove from cache if already imported (for testing)
-        if module_name in sys.modules:
-            del sys.modules[module_name]
-
-        spec = importlib.util.spec_from_file_location(
-            module_name, init_file, submodule_search_locations=[]
-        )
-        if spec is None or spec.loader is None:
-            return PluginLoadResult(
-                success=False,
-                error=PluginLoadError(
-                    plugin_id=plugin_id,
-                    path=plugin_dir,
-                    errors=(f"Failed to create module spec for {init_file}",),
-                ),
-            )
-
-        module = importlib.util.module_from_spec(spec)
-        sys.modules[module_name] = module
-        spec.loader.exec_module(module)
-    except Exception as e:
-        # Clean up module from sys.modules on import failure
-        if module_name in sys.modules:
-            del sys.modules[module_name]
-        return PluginLoadResult(
-            success=False,
-            error=PluginLoadError(
-                plugin_id=plugin_id,
-                path=plugin_dir,
-                errors=(f"Failed to import plugin module: {e}",),
-            ),
-        )
-
-    # Validate manifest
-    manifest_errors = _validate_manifest(module, plugin_dir)
-    errors.extend(manifest_errors)
-
-    # If manifest is valid, perform additional validation
-    manifest = getattr(module, "PLUGIN_MANIFEST", None)
-    if isinstance(manifest, PluginManifest):
-        # Validate api_version
-        api_errors = _validate_api_version(manifest)
-        errors.extend(api_errors)
-
-        # Validate capabilities
-        cap_errors = _validate_capabilities(manifest)
-        errors.extend(cap_errors)
-
-        # Use manifest id if available
-        plugin_id = manifest.id
-
-    # Check if any errors occurred
-    if errors:
-        # Clean up module from sys.modules
-        if module_name in sys.modules:
-            del sys.modules[module_name]
-
-        return PluginLoadResult(
-            success=False,
-            error=PluginLoadError(
-                plugin_id=plugin_id,
-                path=plugin_dir,
-                errors=tuple(errors),
-            ),
-        )
-
-    # Get MODEL_REQUIREMENTS
-    model_requirements = tuple(getattr(module, "MODEL_REQUIREMENTS", []))
-    create_engine = getattr(module, "create_engine", None)
-
-    return PluginLoadResult(
-        success=True,
-        manifest=manifest,
-        model_requirements=model_requirements,
-        create_engine=create_engine,
-        module=module,
-    )
-
-
-def discover_plugins(plugin_dirs: list[Path]) -> list[PluginLoadResult]:
-    """Discover and load plugins from multiple directories.
-
-    Args:
-        plugin_dirs: List of directories to scan for plugins.
-
-    Returns:
-        List of PluginLoadResult, one per plugin directory found.
-    """
-    results: list[PluginLoadResult] = []
-
-    for plugin_dir in plugin_dirs:
-        if not plugin_dir.exists():
-            continue
-
-        # Scan for subdirectories (each is a potential plugin)
-        for item in sorted(plugin_dir.iterdir()):
-            if item.is_dir() and not item.name.startswith("."):
-                result = load_plugin_from_dir(item)
-                results.append(result)
-
-    return results
-
-
-def load_plugin(
-    plugin_dir: Path,
-) -> PluginLoadResult:
-    """Load a single plugin from a directory.
-
-    This is the main entry point for loading a plugin.
-
-    Args:
-        plugin_dir: Path to the plugin directory.
-
-    Returns:
-        PluginLoadResult with success status and either plugin data or error info.
-    """
-    return load_plugin_from_dir(plugin_dir)

abogen/tts_plugin/manifest.py

@@ -1,189 +0,0 @@
-"""Plugin manifest types for the TTS Plugin Architecture.
-
-This module contains static metadata types that describe plugins.
-These types have no dependencies and are immutable.
-"""
-
-from __future__ import annotations
-
-from dataclasses import dataclass, field
-from typing import Any
-
-
-@dataclass(frozen=True)
-class AudioFormatManifest:
-    """Manifest describing an audio format.
-
-    Attributes:
-        mime: MIME type of the audio.
-        extension: File extension.
-    """
-
-    mime: str
-    extension: str
-
-
-@dataclass(frozen=True)
-class EnumOption:
-    """Manifest describing an enum option for a parameter.
-
-    Attributes:
-        value: The enum value.
-        label: Human-readable label.
-    """
-
-    value: str
-    label: str
-
-
-@dataclass(frozen=True)
-class ParameterManifest:
-    """Manifest describing a synthesis parameter.
-
-    Attributes:
-        id: Parameter identifier.
-        name: Human-readable name.
-        description: Parameter description.
-        type: Parameter type ("float", "int", "string", "boolean", "enum").
-        default: Default value.
-        min: Minimum value (optional, for numeric types).
-        max: Maximum value (optional, for numeric types).
-        step: Step size (optional, for numeric types).
-        options: Available options (optional, for enum type).
-        unit: Unit of measurement (optional).
-        group: Parameter group (optional).
-    """
-
-    id: str
-    name: str
-    description: str
-    type: str
-    default: Any
-    min: float | None = None
-    max: float | None = None
-    step: float | None = None
-    options: tuple[EnumOption, ...] = field(default_factory=tuple)
-    unit: str | None = None
-    group: str | None = None
-
-
-@dataclass(frozen=True)
-class VoiceManifest:
-    """Manifest describing a voice.
-
-    Attributes:
-        id: Voice identifier.
-        name: Human-readable name.
-        tags: Voice tags (e.g., language, style).
-    """
-
-    id: str
-    name: str
-    tags: tuple[str, ...] = field(default_factory=tuple)
-
-
-@dataclass(frozen=True)
-class VoiceSourceManifest:
-    """Manifest describing a voice source.
-
-    Attributes:
-        id: Voice source identifier.
-        name: Human-readable name.
-        type: Source type ("list", "speaker_id", "clone", "blend", "generate", "none").
-        config: Source-specific configuration.
-    """
-
-    id: str
-    name: str
-    type: str
-    config: Any = None
-
-
-@dataclass(frozen=True)
-class EngineManifest:
-    """Manifest describing engine capabilities.
-
-    Attributes:
-        voiceSources: Available voice sources.
-        parameters: Available synthesis parameters.
-        audioFormats: Supported audio formats.
-    """
-
-    voiceSources: tuple[VoiceSourceManifest, ...] = field(default_factory=tuple)
-    parameters: tuple[ParameterManifest, ...] = field(default_factory=tuple)
-    audioFormats: tuple[AudioFormatManifest, ...] = field(default_factory=tuple)
-
-
-@dataclass(frozen=True)
-class GpuRequirement:
-    """Manifest describing GPU requirements.
-
-    Attributes:
-        required: Whether GPU is required.
-        type: GPU type (e.g., "cuda", "rocm").
-        memory: Required GPU memory in GB.
-    """
-
-    required: bool = False
-    type: str | None = None
-    memory: float | None = None
-
-
-@dataclass(frozen=True)
-class RequirementManifest:
-    """Manifest describing plugin requirements.
-
-    Attributes:
-        gpu: GPU requirements (optional).
-        memory: Required RAM in GB (optional).
-        internet: Whether internet is required (optional).
-    """
-
-    gpu: GpuRequirement | None = None
-    memory: float | None = None
-    internet: bool | None = None
-
-
-@dataclass(frozen=True)
-class ModelManifest:
-    """Manifest describing a model requirement.
-
-    Attributes:
-        id: Model identifier.
-        name: Human-readable name.
-        size: Model size as string (e.g., "100MB", "2GB").
-    """
-
-    id: str
-    name: str
-    size: str
-
-
-@dataclass(frozen=True)
-class PluginManifest:
-    """Main manifest for a TTS plugin.
-
-    Attributes:
-        id: Plugin identifier (unique).
-        name: Human-readable name.
-        version: Plugin version.
-        api_version: API version (semver format: MAJOR.MINOR).
-        description: Plugin description.
-        author: Plugin author.
-        capabilities: List of capability identifiers.
-        requires: Plugin requirements.
-        engine: Engine manifest.
-        voices: Optional static voice catalog. None = not declared (use VoiceLister),
-            empty tuple = explicitly no static voices, non-empty = static catalog.
-    """
-
-    id: str
-    name: str
-    version: str
-    api_version: str
-    description: str
-    author: str
-    capabilities: tuple[str, ...] = field(default_factory=tuple)
-    requires: RequirementManifest = field(default_factory=RequirementManifest)
-    engine: EngineManifest = field(default_factory=EngineManifest)
-    voices: tuple[VoiceManifest, ...] | None = None

abogen/tts_plugin/plugin.py

@@ -1,55 +0,0 @@
-"""Plugin contract for the TTS Plugin Architecture.
-
-This module defines the plugin contract that all TTS plugins must implement.
-Each plugin must export:
-- PLUGIN_MANIFEST: PluginManifest instance
-- MODEL_REQUIREMENTS: list of ModelManifest instances
-- create_engine(): Factory function that creates an Engine
-
-The create_engine() function is the entry point for plugin activation.
-It must be atomic: succeed fully or raise and clean up.
-"""
-
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Protocol, runtime_checkable
-
-from abogen.tts_plugin.engine import Engine
-from abogen.tts_plugin.host_context import HostContext
-from abogen.tts_plugin.types import EngineConfig
-
-
-@runtime_checkable
-class Plugin(Protocol):
-    """Protocol defining the plugin contract.
-
-    Every TTS plugin must implement this protocol by exporting:
-    - PLUGIN_MANIFEST: PluginManifest
-    - MODEL_REQUIREMENTS: list[ModelManifest]
-    - create_engine: Callable[[HostContext, Path | None, EngineConfig], Engine]
-    """
-
-    def create_engine(
-        self,
-        context: HostContext,
-        model_path: Path | None,
-        config: EngineConfig,
-    ) -> Engine:
-        """Create an engine instance.
-
-        This is the factory function that creates an Engine from a plugin.
-        It must be atomic: succeed fully or raise EngineError and clean up.
-
-        Args:
-            context: Host services (config dir, logger, http client).
-            model_path: Resolved model path, or None for cloud/no-model engines.
-            config: Engine initialization settings.
-
-        Returns:
-            A fully initialized Engine instance.
-
-        Raises:
-            EngineError: On failure. Cleans up partially created resources.
-        """
-        ...

abogen/tts_plugin/plugin_manager.py

@@ -1,153 +0,0 @@
-"""Plugin Manager
-
-Provides a simple interface for consumers to access TTS engines via the
-new Plugin Architecture. Discovers, loads, and manages plugins from the
-plugins directory.
-
-Usage:
-    from abogen.tts_plugin.plugin_manager import get_plugin_manager
-
-    manager = get_plugin_manager()
-    engine = manager.create_engine("kokoro", lang_code="a", device="cpu")
-    session = engine.create_session()
-    try:
-        result = session.synthesize("Hello world")
-    finally:
-        session.dispose()
-"""
-
-from typing import Any, Dict, List, Optional, Type
-
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.manifest import PluginManifest
-from abogen.tts_plugin.types import AudioFormat
-
-
-class PluginManager:
-    """Manages TTS plugins and provides a simple interface for consumers."""
-
-    def __init__(self) -> None:
-        self._plugins: Dict[str, dict] = {}
-        self._engines: Dict[str, Engine] = {}
-        self._loaded = False
-
-    def discover(self, plugins_dir: str = "plugins") -> None:
-        """Discover and load all plugins from the given directory."""
-        import os
-        from pathlib import Path
-        from abogen.tts_plugin.loader import load_plugin_from_dir
-
-        self._plugins.clear()
-        self._engines.clear()
-
-        plugins_path = Path(plugins_dir)
-        if not plugins_path.exists():
-            self._loaded = True
-            return
-
-        for entry in plugins_path.iterdir():
-            if entry.is_dir() and (entry / "__init__.py").exists():
-                try:
-                    result = load_plugin_from_dir(entry)
-                    if result.success and result.manifest is not None:
-                        self._plugins[result.manifest.id] = {
-                            "manifest": result.manifest,
-                            "create_engine": result.create_engine,
-                            "module": result.module,
-                        }
-                except Exception as e:
-                    # Log error but continue with other plugins
-                    print(f"Warning: Failed to load plugin from {entry}: {e}")
-
-        self._loaded = True
-
-    def _ensure_loaded(self) -> None:
-        """Ensure plugins have been discovered."""
-        if not self._loaded:
-            self.discover()
-
-    def list_plugins(self) -> List[PluginManifest]:
-        """Return manifests for all loaded plugins."""
-        self._ensure_loaded()
-        return [info["manifest"] for info in self._plugins.values()]
-
-    def get_plugin(self, plugin_id: str) -> Optional[dict]:
-        """Get plugin info by ID."""
-        self._ensure_loaded()
-        return self._plugins.get(plugin_id)
-
-    def has_plugin(self, plugin_id: str) -> bool:
-        """Check if a plugin is loaded."""
-        self._ensure_loaded()
-        return plugin_id in self._plugins
-
-    def create_engine(self, plugin_id: str, **kwargs: Any) -> Engine:
-        """Create an engine instance for the given plugin.
-
-        Args:
-            plugin_id: The plugin identifier (e.g., "kokoro")
-            **kwargs: Arguments passed to the engine constructor
-
-        Returns:
-            An Engine instance
-
-        Raises:
-            KeyError: If plugin_id is not found
-            Exception: If engine creation fails
-        """
-        self._ensure_loaded()
-
-        if plugin_id not in self._plugins:
-            raise KeyError(f"Plugin not found: {plugin_id}")
-
-        plugin_info = self._plugins[plugin_id]
-        create_engine_func = plugin_info["create_engine"]
-
-        # Create engine using the plugin's factory
-        engine = create_engine_func(**kwargs)
-        return engine
-
-    def get_or_create_engine(self, plugin_id: str, **kwargs: Any) -> Engine:
-        """Get an existing engine or create a new one.
-
-        Engines are cached by plugin_id. If you need multiple instances
-        with different parameters, use create_engine() directly.
-        """
-        self._ensure_loaded()
-
-        cache_key = plugin_id
-        if cache_key in self._engines:
-            return self._engines[cache_key]
-
-        engine = self.create_engine(plugin_id, **kwargs)
-        self._engines[cache_key] = engine
-        return engine
-
-    def dispose_all(self) -> None:
-        """Dispose all cached engines."""
-        for engine in self._engines.values():
-            try:
-                engine.dispose()
-            except Exception:
-                pass  # dispose() should never raise
-        self._engines.clear()
-
-
-# Global singleton
-_manager: Optional[PluginManager] = None
-
-
-def get_plugin_manager() -> PluginManager:
-    """Get the global PluginManager instance."""
-    global _manager
-    if _manager is None:
-        _manager = PluginManager()
-    return _manager
-
-
-def reset_plugin_manager() -> None:
-    """Reset the global PluginManager (for testing)."""
-    global _manager
-    if _manager is not None:
-        _manager.dispose_all()
-    _manager = None

abogen/tts_plugin/types.py

@@ -1,111 +0,0 @@
-"""Core domain types for the TTS Plugin Architecture.
-
-This module contains immutable value objects that form the core domain.
-These types have zero dependencies and are used across the plugin system.
-"""
-
-from __future__ import annotations
-
-from dataclasses import dataclass, field
-from typing import Any, Mapping
-
-
-@dataclass(frozen=True)
-class AudioFormat:
-    """Immutable value object representing an audio format.
-
-    Attributes:
-        mime: MIME type of the audio (e.g., "audio/wav", "audio/mpeg").
-        extension: File extension (e.g., "wav", "mp3").
-    """
-
-    mime: str
-    extension: str
-
-
-@dataclass(frozen=True)
-class Duration:
-    """Immutable value object representing a time duration.
-
-    Attributes:
-        seconds: Duration in seconds.
-    """
-
-    seconds: float
-
-
-@dataclass(frozen=True)
-class VoiceSelection:
-    """Immutable value object for voice selection. Opaque to engine.
-
-    Attributes:
-        source: Voice source identifier (e.g., "builtin", "clone").
-        key: Voice key within the source.
-        payload: Optional payload for clone/blend sources.
-    """
-
-    source: str
-    key: str
-    payload: Any = None
-
-
-@dataclass(frozen=True)
-class ParameterValues:
-    """Immutable value object for synthesis parameters. Behaves like Mapping[str, Any].
-
-    Attributes:
-        values: Mapping of parameter names to their values.
-    """
-
-    values: Mapping[str, Any] = field(default_factory=dict)
-
-
-@dataclass(frozen=True)
-class SynthesisRequest:
-    """Immutable value object for a synthesis request.
-
-    Attributes:
-        text: Text to synthesize.
-        voice: Voice selection.
-        parameters: Synthesis parameters.
-        format: Desired audio output format.
-    """
-
-    text: str
-    voice: VoiceSelection
-    parameters: ParameterValues
-    format: AudioFormat
-
-
-@dataclass(frozen=True)
-class SynthesizedAudio:
-    """Immutable value object for synthesized audio result.
-
-    Attributes:
-        data: Raw audio bytes.
-        format: Audio format of the result.
-        duration: Duration of the audio.
-    """
-
-    data: bytes
-    format: AudioFormat
-    duration: Duration
-
-
-@dataclass(frozen=True)
-class EngineConfig:
-    """Immutable configuration of an Engine instance.
-
-    Contains parameters that define how a particular Engine instance is
-    created and that remain constant throughout the lifetime of that Engine.
-
-    Plugin implementations may ignore fields that are not applicable to them.
-
-    Attributes:
-        device: Device to use (e.g., "cpu", "cuda:0").
-        lang_code: Language code for the engine (e.g., "a" for Kokoro English).
-            Plugins that do not require a language code ignore this field.
-    """
-
-    device: str = "cpu"
-    lang_code: str = "a"

abogen/tts_plugin/utils.py

@@ -1,235 +0,0 @@
-"""TTS Plugin Architecture — direct utility functions.
-
-Provides helpers that replace the former compatibility adapter by
-calling the Plugin Manager directly.
-"""
-
-from __future__ import annotations
-
-from typing import Any, Iterator
-
-import numpy as np
-
-from abogen.tts_plugin.plugin_manager import get_plugin_manager
-
-
-def get_voices(plugin_id: str) -> tuple[str, ...]:
-    """Return the voice-id tuple for *plugin_id*.
-
-    Uses the official Plugin Architecture: PluginManager → Engine → VoiceLister.
-    First checks plugin manifest for static voice catalog.
-    """
-    import logging
-    import tempfile
-    from pathlib import Path
-
-    from abogen.tts_plugin.host_context import HostContext
-    from abogen.tts_plugin.types import EngineConfig
-
-    manager = get_plugin_manager()
-    if not manager.has_plugin(plugin_id):
-        return ()
-
-    # Check manifest for static voice catalog
-    plugin_info = manager.get_plugin(plugin_id)
-    if plugin_info is not None:
-        manifest = plugin_info.get("manifest")
-        if manifest is not None and manifest.voices is not None:
-            return tuple(v.id for v in manifest.voices)
-
-    ctx = HostContext(
-        config_dir=Path(tempfile.gettempdir()),
-        logger=logging.getLogger(f"abogen.utils.{plugin_id}"),
-        http_client=type("_StubHttpClient", (), {
-            "get": staticmethod(lambda url, **kw: None),
-            "post": staticmethod(lambda url, **kw: None),
-        })(),
-    )
-
-    try:
-        engine = manager.create_engine(
-            plugin_id,
-            context=ctx,
-            model_path=None,
-            config=EngineConfig(device="cpu"),
-        )
-    except Exception:
-        return ()
-
-    try:
-        from abogen.tts_plugin.capabilities import VoiceLister
-
-        if isinstance(engine, VoiceLister):
-            manifests = engine.listVoices("builtin")
-            return tuple(v.id for v in manifests)
-        return ()
-    except Exception:
-        return ()
-    finally:
-        engine.dispose()
-
-
-def get_default_voice(plugin_id: str, fallback: str = "") -> str:
-    """Return the first voice of *plugin_id*, or *fallback*."""
-    voices = get_voices(plugin_id)
-    return voices[0] if voices else fallback
-
-
-def is_plugin_registered(plugin_id: str) -> bool:
-    """Check whether *plugin_id* is loaded by the Plugin Manager."""
-    return get_plugin_manager().has_plugin(plugin_id)
-
-
-def resolve_voice_to_plugin(spec: str, fallback: str = "kokoro") -> str:
-    """Determine which plugin owns the given voice specification.
-
-    Resolution rules:
-    1. Empty spec -> fallback
-    2. Kokoro formula (contains '*' or '+') -> "kokoro"
-    3. Exact voice-id match against loaded plugins -> plugin id
-    4. Unknown voice -> fallback
-    """
-    raw = str(spec or "").strip()
-    if not raw:
-        return fallback
-
-    if "*" in raw or "+" in raw:
-        return "kokoro"
-
-    upper = raw.upper()
-    manager = get_plugin_manager()
-
-    for manifest in manager.list_plugins():
-        for voice_source in manifest.engine.voiceSources:
-            if voice_source.type == "list" and isinstance(voice_source.config, dict):
-                try:
-                    engine = manager.create_engine(manifest.id)
-                    try:
-                        if hasattr(engine, "listVoices"):
-                            voice_manifests = engine.listVoices(voice_source.id)
-                            voice_ids = [v.id.upper() for v in voice_manifests]
-                            if upper in voice_ids:
-                                return manifest.id
-                    finally:
-                        engine.dispose()
-                except Exception:
-                    continue
-
-    return fallback
-
-
-class Pipeline:
-    """Callable wrapper around Engine / EngineSession.
-
-    Presents the same interface that old callers expect::
-
-        pipeline = create_pipeline("kokoro", lang_code="a", device="cpu")
-        for segment in pipeline(text, voice="af_nova", speed=1.0):
-            audio = segment.audio
-    """
-
-    def __init__(self, engine: Any, **engine_kwargs: Any) -> None:
-        self._engine = engine
-        self._engine_kwargs = engine_kwargs
-        self._session: Any = None
-
-    def _ensure_session(self) -> Any:
-        if self._session is None:
-            self._session = self._engine.createSession()
-        return self._session
-
-    def __call__(
-        self,
-        text: str,
-        voice: str = "default",
-        speed: float = 1.0,
-        split_pattern: str | None = None,
-        **kwargs: Any,
-    ) -> Iterator[Any]:
-        from abogen.tts_plugin.types import (
-            AudioFormat,
-            ParameterValues,
-            SynthesisRequest,
-            VoiceSelection,
-        )
-
-        session = self._ensure_session()
-
-        params: dict[str, Any] = {"speed": speed}
-        if split_pattern is not None:
-            params["split_pattern"] = split_pattern
-        params.update(kwargs)
-
-        request = SynthesisRequest(
-            text=text,
-            voice=VoiceSelection(source="builtin", key=voice),
-            parameters=ParameterValues(values=params),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-
-        result = session.synthesize(request)
-        audio_array = np.frombuffer(result.data, dtype=np.float32)
-
-        from dataclasses import dataclass
-
-        @dataclass
-        class Segment:
-            graphemes: str
-            audio: np.ndarray
-
-        yield Segment(graphemes=text, audio=audio_array)
-
-    def dispose(self) -> None:
-        if self._session is not None:
-            try:
-                self._session.dispose()
-            except Exception:
-                pass
-            self._session = None
-
-    def __del__(self) -> None:
-        self.dispose()
-
-
-def create_pipeline(
-    plugin_id: str,
-    *,
-    lang_code: str = "a",
-    device: str = "cpu",
-) -> Pipeline:
-    """Create a callable TTS pipeline via the Plugin Architecture.
-
-    Builds a proper HostContext and EngineConfig, then delegates to the
-    PluginManager to create the engine. Returns a :class:`Pipeline` whose
-    ``__call__`` interface matches the callable protocol used by consumers.
-
-    Args:
-        plugin_id: Plugin identifier (e.g., "kokoro", "supertonic").
-        lang_code: Language code for the engine.
-        device: Device to use (e.g., "cpu", "cuda:0").
-
-    Returns:
-        A callable Pipeline instance.
-    """
-    import logging
-    import tempfile
-    from pathlib import Path
-
-    from abogen.tts_plugin.host_context import HostContext
-    from abogen.tts_plugin.types import EngineConfig
-
-    manager = get_plugin_manager()
-
-    ctx = HostContext(
-        config_dir=Path(tempfile.gettempdir()),
-        logger=logging.getLogger(f"abogen.pipeline.{plugin_id}"),
-        http_client=type("_StubHttpClient", (), {
-            "get": staticmethod(lambda url, **kw: None),
-            "post": staticmethod(lambda url, **kw: None),
-        })(),
-    )
-
-    config = EngineConfig(device=device, lang_code=lang_code)
-
-    engine = manager.create_engine(plugin_id, context=ctx, model_path=None, config=config)
-    return Pipeline(engine)

abogen/tts_supertonic.py

@@ -1,25 +1,31 @@
-"""SuperTonic Pipeline — self-contained TTS pipeline for the plugin.
-
-This module provides the SuperTonicPipeline class and supporting utilities
-used by the SuperTonic plugin. It is independent of the legacy
-abogen.tts_backends module.
-"""
-
 from __future__ import annotations
 
 import ast
+from dataclasses import dataclass
 import logging
+import math
 import re
 from typing import Any, Iterable, Iterator, Optional
 
 import numpy as np
 
+
 logger = logging.getLogger(__name__)
 
 
+DEFAULT_SUPERTONIC_VOICES = ("M1", "M2", "M3", "M4", "M5", "F1", "F2", "F3", "F4", "F5")
+
+
+@dataclass
+class SupertonicSegment:
+    graphemes: str
+    audio: np.ndarray
+
+
 def _ensure_float32_mono(wav: Any) -> np.ndarray:
     arr = np.asarray(wav, dtype="float32")
     if arr.ndim == 2:
+        # (n, 1) or (1, n) or (n, channels)
         if arr.shape[0] == 1 and arr.shape[1] > 1:
             arr = arr.reshape(-1)
         else:
@@ -56,6 +62,7 @@ def _split_text(
     else:
         parts = [stripped]
 
+    # Enforce max length by hard-splitting long parts.
     result: list[str] = []
     for part in parts:
         if len(part) <= max_chunk_length:
@@ -64,6 +71,7 @@ def _split_text(
         start = 0
         while start < len(part):
             end = min(len(part), start + max_chunk_length)
+            # Try to split at whitespace.
             if end < len(part):
                 ws = part.rfind(" ", start, end)
                 if ws > start + 40:
@@ -82,6 +90,7 @@ _UNSUPPORTED_CHARS_RE = re.compile(
 
 def _parse_unsupported_characters(error: BaseException) -> list[str]:
     """Best-effort extraction of unsupported characters from SuperTonic errors."""
+
     message = " ".join(
         str(part) for part in getattr(error, "args", ()) if part is not None
     ) or str(error)
@@ -127,11 +136,16 @@ def _configure_supertonic_gpu() -> None:
 
         available = ort.get_available_providers()
 
+        # Use CUDA if available, skip TensorRT (requires extra libs not always present)
+        # TensorrtExecutionProvider may be listed as available but fail at runtime
+        # if TensorRT libraries (libnvinfer.so) are not installed
         providers = []
         if "CUDAExecutionProvider" in available:
             providers.append("CUDAExecutionProvider")
         providers.append("CPUExecutionProvider")
 
+        # Patch supertonic's config and loader before TTS import
+        # We must patch both because loader imports the value at module load time
         import supertonic.config as supertonic_config
         import supertonic.loader as supertonic_loader
 
@@ -142,16 +156,6 @@ def _configure_supertonic_gpu() -> None:
         logger.warning("Could not configure supertonic GPU providers: %s", exc)
 
 
-class SupertonicSegment:
-    """A single synthesized audio segment."""
-
-    __slots__ = ("graphemes", "audio")
-
-    def __init__(self, graphemes: str, audio: np.ndarray) -> None:
-        self.graphemes = graphemes
-        self.audio = audio
-
-
 class SupertonicPipeline:
     """Minimal adapter that mimics Kokoro's pipeline iteration interface."""
 
@@ -167,6 +171,7 @@ class SupertonicPipeline:
         self.total_steps = int(total_steps)
         self.max_chunk_length = int(max_chunk_length)
 
+        # Configure GPU providers before importing TTS
         _configure_supertonic_gpu()
 
         try:
@@ -202,6 +207,7 @@ class SupertonicPipeline:
             removed: set[str] = set()
             last_exc: Exception | None = None
 
+            # SuperTonic can raise ValueError for unsupported characters; strip and retry.
             for attempt in range(3):
                 try:
                     wav, duration = self._tts.synthesize(
@@ -225,6 +231,7 @@ class SupertonicPipeline:
                         chunk_to_speak, unsupported
                     ).strip()
 
+                    # If we didn't change anything, don't loop forever.
                     if sanitized == chunk_to_speak.strip():
                         raise
 
@@ -242,6 +249,7 @@ class SupertonicPipeline:
                             sorted(removed),
                         )
             else:
+                # Exhausted retries.
                 assert last_exc is not None
                 raise last_exc
 
@@ -250,6 +258,7 @@ class SupertonicPipeline:
 
             audio = _ensure_float32_mono(wav)
 
+            # If duration is present, infer the source sample rate and resample if needed.
             src_rate = self.sample_rate
             try:
                 dur = float(duration)

abogen/utils.py

@@ -529,20 +529,21 @@ def prevent_sleep_end():
                 _sleep_procs[system] = None
 
 
+def load_numpy_kpipeline():
+    import numpy as np
+    from kokoro import KPipeline  # type: ignore[import-not-found]
+
+    return np, KPipeline
+
+
 class LoadPipelineThread(Thread):
-    def __init__(self, callback, lang_code="a", device="cpu"):
+    def __init__(self, callback):
         super().__init__()
         self.callback = callback
-        self.lang_code = lang_code
-        self.device = device
 
     def run(self):
         try:
-            from abogen.tts_plugin.utils import create_pipeline
+            np_module, kpipeline_class = load_numpy_kpipeline()
-
+            self.callback(np_module, kpipeline_class, None)
-            backend = create_pipeline(
-                "kokoro", lang_code=self.lang_code, device=self.device
-            )
-            self.callback(backend, None)
         except Exception as e:
-            self.callback(None, str(e))
+            self.callback(None, None, str(e))

abogen/voice_cache.py

@@ -17,7 +17,7 @@ if LocalEntryNotFoundError is None:  # pragma: no cover - fallback for tests
         pass
 
 
-from abogen.tts_plugin.utils import get_voices
+from abogen.constants import VOICES_INTERNAL
 
 _CACHE_LOCK = threading.Lock()
 _CACHED_VOICES: Set[str] = set()
@@ -26,9 +26,8 @@ _BOOTSTRAPPED = False
 
 
 def _normalize_targets(voices: Optional[Iterable[str]]) -> Set[str]:
-    kokoro_voices = get_voices("kokoro")
     if not voices:
-        return set(kokoro_voices)
+        return set(VOICES_INTERNAL)
     normalized: Set[str] = set()
     for voice in voices:
         if not voice:
@@ -36,7 +35,7 @@ def _normalize_targets(voices: Optional[Iterable[str]]) -> Set[str]:
         voice_id = str(voice).strip()
         if not voice_id:
             continue
-        if voice_id in kokoro_voices:
+        if voice_id in VOICES_INTERNAL:
             normalized.add(voice_id)
     return normalized
 

abogen/voice_formulas.py

@@ -1,7 +1,7 @@
 import re
 from typing import List, Tuple
 
-from abogen.tts_plugin.utils import get_voices
+from abogen.constants import VOICES_INTERNAL
 
 
 # Calls parsing and loads the voice to gpu or cpu
@@ -22,7 +22,6 @@ def parse_formula_terms(formula: str) -> List[Tuple[str, float]]:
         raise ValueError("Empty voice formula")
 
     terms: List[Tuple[str, float]] = []
-    kokoro_voices = get_voices("kokoro")
     for segment in formula.split("+"):
         part = segment.strip()
         if not part:
@@ -31,7 +30,7 @@ def parse_formula_terms(formula: str) -> List[Tuple[str, float]]:
             raise ValueError("Each component must be in the form voice*weight")
         voice_name, raw_weight = part.split("*", 1)
         voice_name = voice_name.strip()
-        if voice_name not in kokoro_voices:
+        if voice_name not in VOICES_INTERNAL:
             raise ValueError(f"Unknown voice: {voice_name}")
         try:
             weight = float(raw_weight.strip())

abogen/voice_metadata.py

@@ -1,33 +0,0 @@
-from dataclasses import dataclass
-
-
-@dataclass(frozen=True)
-class VoiceMetadata:
-    """
-    Immutable metadata describing a voice from a TTS backend.
-
-    This model describes a voice independently of any backend implementation.
-    Backends populate these objects; the application consumes them.
-
-    The ``backend_id`` field is set by the backend itself (via
-    ``self.metadata.id``) — the application never hardcodes it.
-    This ensures renaming a backend does not require touching voice definitions.
-    """
-
-    id: str
-    """Unique voice identifier within the backend (e.g. ``"af_alloy"``, ``"M1"``)."""
-
-    display_name: str
-    """Human-readable display name (e.g. ``"Alloy"``, ``"Male 1"``)."""
-
-    language: str
-    """Language code — backend-specific format is acceptable (e.g. ``"a"``, ``"en"``)."""
-
-    gender: str
-    """Gender category: ``"female"``, ``"male"``, or ``"unknown"``."""
-
-    backend_id: str
-    """Identifier of the backend that owns this voice (e.g. ``"kokoro"``).
-
-    Set automatically by the backend — never hardcoded in voice definitions.
-    """

abogen/voice_profiles.py

@@ -2,7 +2,8 @@ import json
 import os
 from typing import Any, Dict, Iterable, List, Tuple
 
-from abogen.tts_plugin.utils import get_voices, is_plugin_registered
+from abogen.constants import VOICES_INTERNAL
+from abogen.tts_supertonic import DEFAULT_SUPERTONIC_VOICES
 from abogen.utils import get_user_config_path
 
 
@@ -69,8 +70,7 @@ def serialize_profiles() -> Dict[str, Dict[str, Iterable[Tuple[str, float]]]]:
 
 def _normalize_supertonic_voice(value: Any) -> str:
     raw = str(value or "").strip().upper()
-    supertonic_voices = get_voices("supertonic")
+    return raw if raw in DEFAULT_SUPERTONIC_VOICES else "M1"
-    return raw if raw in supertonic_voices else "M1"
 
 
 def _coerce_supertonic_steps(value: Any) -> int:
@@ -101,7 +101,7 @@ def normalize_profile_entry(entry: Any) -> Dict[str, Any]:
         return {}
 
     provider = str(entry.get("provider") or "kokoro").strip().lower()
-    if not is_plugin_registered(provider):
+    if provider not in {"kokoro", "supertonic"}:
         provider = "kokoro"
 
     language = str(entry.get("language") or "a").strip().lower() or "a"
@@ -135,7 +135,6 @@ def normalize_profile_entry(entry: Any) -> Dict[str, Any]:
 
 def _normalize_voice_entries(entries: Iterable) -> List[Tuple[str, float]]:
     normalized: List[Tuple[str, float]] = []
-    kokoro_voices = get_voices("kokoro")
     for item in entries or []:
         if isinstance(item, dict):
             voice = item.get("id") or item.get("voice")
@@ -144,7 +143,7 @@ def _normalize_voice_entries(entries: Iterable) -> List[Tuple[str, float]]:
             voice, weight = item[0], item[1]
         else:
             continue
-        if voice not in kokoro_voices:
+        if voice not in VOICES_INTERNAL:
             continue
         if weight is None:
             continue

abogen/webui/Dockerfile

@@ -2,6 +2,7 @@ FROM nvidia/cuda:12.6.3-cudnn-runtime-ubuntu22.04
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
   PYTHONUNBUFFERED=1 \
+  PIP_NO_CACHE_DIR=1 \
   VIRTUAL_ENV=/opt/venv \
   PATH=/opt/venv/bin:$PATH
 
@@ -26,22 +27,22 @@ RUN python3 -m venv "$VIRTUAL_ENV"
 WORKDIR /app
 
 COPY pyproject.toml README.md ./
-RUN pip install uv \
-  && if [ -n "$TORCH_VERSION" ]; then \
-       uv pip install --system torch=="$TORCH_VERSION" torchvision=="$TORCH_VERSION" torchaudio=="$TORCH_VERSION" --index-url "$TORCH_INDEX_URL"; \
-     else \
-       uv pip install --system torch torchvision torchaudio --index-url "$TORCH_INDEX_URL"; \
-     fi \
-  && uv pip install --system . \
-    https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-3.8.0/en_core_web_sm-3.8.0-py3-none-any.whl \
-  && uv pip install --system "mutagen>=1.47.0"
-
 COPY abogen ./abogen
 
+RUN pip install --upgrade pip \
+  && if [ -n "$TORCH_VERSION" ]; then \
+       pip install torch=="$TORCH_VERSION" torchvision=="$TORCH_VERSION" torchaudio=="$TORCH_VERSION" --index-url "$TORCH_INDEX_URL"; \
+     else \
+       pip install torch torchvision torchaudio --index-url "$TORCH_INDEX_URL"; \
+     fi \
+  && pip install --no-cache-dir . \
+    https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-3.8.0/en_core_web_sm-3.8.0-py3-none-any.whl \
+  && pip install --no-cache-dir "mutagen>=1.47.0"
+
 # Install onnxruntime-gpu for CUDA acceleration (supertonic uses ONNX Runtime)
 # Set USE_GPU=false to skip this for CPU-only deployments
 RUN if [ "$USE_GPU" = "true" ]; then \
-      uv pip install --system onnxruntime-gpu; \
+      pip install --no-cache-dir onnxruntime-gpu; \
     fi
 
 ENV ABOGEN_HOST=0.0.0.0 \

abogen/webui/conversion_runner.py

@@ -20,7 +20,7 @@ import numpy as np
 import soundfile as sf
 import static_ffmpeg
 
-from abogen.tts_plugin.utils import get_voices, is_plugin_registered, resolve_voice_to_plugin
+from abogen.constants import VOICES_INTERNAL
 from abogen.epub3.exporter import build_epub3_package
 from abogen.kokoro_text_normalization import ApostropheConfig, normalize_for_pipeline, HAS_NUM2WORDS
 from abogen.normalization_settings import (
@@ -39,14 +39,14 @@ from abogen.utils import (
     get_user_cache_path,
     get_user_output_path,
     load_config,
+    load_numpy_kpipeline,
 )
-from abogen.tts_plugin.utils import create_pipeline
 from abogen.voice_cache import ensure_voice_assets
 from abogen.voice_formulas import extract_voice_ids, get_new_voice
 from abogen.voice_profiles import load_profiles, normalize_profile_entry
 from abogen.pronunciation_store import increment_usage
 from abogen.llm_client import LLMClientError
-
+from abogen.tts_supertonic import DEFAULT_SUPERTONIC_VOICES, SupertonicPipeline
 
 from .service import Job, JobStatus
 
@@ -56,26 +56,25 @@ SAMPLE_RATE = 24000
 
 
 def _supertonic_voice_from_spec(spec: Any, fallback: str) -> str:
-    """Normalize a voice specification for Supertonic.
-
-    This function only performs Supertonic-specific normalization (uppercase conversion
-    and fallback handling). Backend resolution is handled by the registry.
-    """
     raw = str(spec or "").strip()
     fallback_raw = str(fallback or "").strip()
 
-    # Normalize to uppercase for Supertonic voice IDs
+    # SuperTonic voices are discrete IDs (M1/F3/...). If we see a Kokoro mix
-    upper = raw.upper() if raw else ""
+    # formula (contains '*' or '+'), ignore it and fall back to a safe voice.
+    if not raw or "*" in raw or "+" in raw:
+        raw = fallback_raw
+    if not raw or "*" in raw or "+" in raw:
+        raw = "M1"
 
-    # If empty or contains formula characters, use fallback
+    upper = raw.upper()
-    if not upper or "*" in upper or "+" in upper:
+    if upper in DEFAULT_SUPERTONIC_VOICES:
-        upper = fallback_raw.upper() if fallback_raw else ""
+        return upper
 
-    # If still empty, use default Supertonic voice
+    fallback_upper = fallback_raw.upper() if fallback_raw else ""
-    if not upper or "*" in upper or "+" in upper:
+    if fallback_upper in DEFAULT_SUPERTONIC_VOICES:
-        upper = "M1"
+        return fallback_upper
 
-    return upper
+    return "M1"
 
 
 def _split_speaker_reference(value: Any) -> tuple[Optional[str], str]:
@@ -119,7 +118,15 @@ def _formula_from_kokoro_entry(entry: Mapping[str, Any]) -> str:
 
 
 def _infer_provider_from_spec(value: Any, fallback: str = "kokoro") -> str:
-    return resolve_voice_to_plugin(str(value or ""), fallback=fallback)
+    raw = str(value or "").strip()
+    if not raw:
+        return fallback
+    upper = raw.upper()
+    if upper in DEFAULT_SUPERTONIC_VOICES:
+        return "supertonic"
+    if "*" in raw or "+" in raw:
+        return "kokoro"
+    return fallback
 
 
 class _JobCancelled(Exception):
@@ -568,7 +575,7 @@ def _spec_to_voice_ids(spec: Any) -> Set[str]:
             return set(extract_voice_ids(text))
         except ValueError:
             return set()
-    if text in get_voices("kokoro"):
+    if text in VOICES_INTERNAL:
         return {text}
     return set()
 
@@ -632,7 +639,7 @@ def _collect_required_voice_ids(job: Job) -> Set[str]:
             for key in ("resolved_voice", "voice_formula", "voice"):
                 voices.update(_spec_to_voice_ids(payload.get(key)))
 
-    voices.update(get_voices("kokoro"))
+    voices.update(VOICES_INTERNAL)
     return voices
 
 
@@ -1566,7 +1573,7 @@ def run_conversion_job(job: Job) -> None:
         def get_pipeline(provider: str) -> Any:
             nonlocal kokoro_cache_ready
             provider_norm = str(provider or "kokoro").strip().lower() or "kokoro"
-            if not is_plugin_registered(provider_norm):
+            if provider_norm not in {"kokoro", "supertonic"}:
                 provider_norm = "kokoro"
 
             existing = pipelines.get(provider_norm)
@@ -1574,8 +1581,10 @@ def run_conversion_job(job: Job) -> None:
                 return existing
 
             if provider_norm == "supertonic":
-                pipelines[provider_norm] = create_pipeline(
+                pipelines[provider_norm] = SupertonicPipeline(
-                    "supertonic",
+                    sample_rate=SAMPLE_RATE,
+                    auto_download=True,
+                    total_steps=int(getattr(job, "supertonic_total_steps", 5) or 5),
                 )
                 return pipelines[provider_norm]
 
@@ -1585,12 +1594,16 @@ def run_conversion_job(job: Job) -> None:
             device = "cpu"
             if not disable_gpu:
                 device = _select_device()
-            # Create KPipeline instance directly (uses new Plugin Architecture)
+            _np, KPipeline = load_numpy_kpipeline()
-            pipelines[provider_norm] = create_pipeline(
+            # Try to initialize with the selected device; fall back to CPU if CUDA fails
-                "kokoro",
+            try:
-                lang_code=job.language,
+                pipelines[provider_norm] = KPipeline(lang_code=job.language, repo_id="hexgrad/Kokoro-82M", device=device)
-                device=device
+            except RuntimeError as e:
-            )
+                if "CUDA" in str(e) and device != "cpu":
+                    job.add_log(f"CUDA initialization failed, falling back to CPU: {e}", level="warning")
+                    pipelines[provider_norm] = KPipeline(lang_code=job.language, repo_id="hexgrad/Kokoro-82M", device="cpu")
+                else:
+                    raise
             if not kokoro_cache_ready:
                 _initialize_voice_cache(job)
                 kokoro_cache_ready = True
@@ -1631,8 +1644,8 @@ def run_conversion_job(job: Job) -> None:
                 return provider, resolved, cached, speed, steps
 
             if provider == "kokoro":
-                kokoro_backend = get_pipeline("kokoro")
+                kokoro_pipeline = get_pipeline("kokoro")
-                choice = _resolve_voice(kokoro_backend, resolved, job.use_gpu)
+                choice = _resolve_voice(kokoro_pipeline, resolved, job.use_gpu)
             else:
                 choice = resolved
 
@@ -1761,8 +1774,8 @@ def run_conversion_job(job: Job) -> None:
         voice_cache: Dict[str, Any] = {}
         base_provider, base_voice_resolved, _, _ = resolve_voice_target(base_voice_spec)
         if base_provider == "kokoro" and base_voice_resolved and "*" not in base_voice_resolved:
-            kokoro_backend = get_pipeline("kokoro")
+            kokoro_pipeline = get_pipeline("kokoro")
-            voice_cache[f"kokoro:{base_voice_resolved}"] = _resolve_voice(kokoro_backend, base_voice_resolved, job.use_gpu)
+            voice_cache[f"kokoro:{base_voice_resolved}"] = _resolve_voice(kokoro_pipeline, base_voice_resolved, job.use_gpu)
         processed_chars = 0
         subtitle_index = 1
         current_time = 0.0
@@ -1792,8 +1805,8 @@ def run_conversion_job(job: Job) -> None:
                     fallback_key = next(iter(voice_cache.keys()), "")
                     if fallback_key and fallback_key != "__custom_mix":
                         intro_voice_spec = fallback_key.split(":", 1)[-1]
-                if not intro_voice_spec:
+                if not intro_voice_spec and VOICES_INTERNAL:
-                    intro_voice_spec = get_default_voice("kokoro")
+                    intro_voice_spec = VOICES_INTERNAL[0]
 
                 if intro_voice_spec:
                     intro_provider, _, intro_voice_choice, intro_speed, intro_steps = resolve_voice_choice(
@@ -1847,59 +1860,53 @@ def run_conversion_job(job: Job) -> None:
                     total_steps=int(supertonic_steps_override if supertonic_steps_override is not None else getattr(job, "supertonic_total_steps", 5)),
                 )
             else:
-                kokoro_backend = get_pipeline("kokoro")
+                kokoro_pipeline = get_pipeline("kokoro")
-                segment_iter = kokoro_backend(
+                segment_iter = kokoro_pipeline(
                     normalized,
                     voice=voice_choice,
                     speed=float(speed_override if speed_override is not None else job.speed),
                     split_pattern=split_pattern,
                 )
 
-            try:
+            for segment in segment_iter:
-                for segment in segment_iter:
+                canceller()
-                    canceller()
+                graphemes_raw = getattr(segment, "graphemes", "") or ""
-                    graphemes_raw = getattr(segment, "graphemes", "") or ""
+                graphemes = graphemes_raw.strip()
-                    graphemes = graphemes_raw.strip()
 
-                    audio = _to_float32(getattr(segment, "audio", None))
+                audio = _to_float32(getattr(segment, "audio", None))
-                    if audio.size == 0:
+                if audio.size == 0:
-                        continue
+                    continue
 
-                    local_segments += 1
+                local_segments += 1
-                    if chapter_sink:
+                if chapter_sink:
-                        chapter_sink.write(audio)
+                    chapter_sink.write(audio)
-                    if audio_sink:
+                if audio_sink:
-                        audio_sink.write(audio)
+                    audio_sink.write(audio)
 
-                    duration = len(audio) / SAMPLE_RATE
+                duration = len(audio) / SAMPLE_RATE
-                    processed_chars += len(graphemes)
+                processed_chars += len(graphemes)
-                    job.processed_characters = processed_chars
+                job.processed_characters = processed_chars
-                    if job.total_characters:
+                if job.total_characters:
-                        job.progress = min(processed_chars / job.total_characters, 0.999)
+                    job.progress = min(processed_chars / job.total_characters, 0.999)
-                    else:
+                else:
-                        job.progress = 0.0 if processed_chars == 0 else 0.999
+                    job.progress = 0.0 if processed_chars == 0 else 0.999
 
-                    preview_text = graphemes or (graphemes_raw[:80] if graphemes_raw else "[silence]")
+                preview_text = graphemes or (graphemes_raw[:80] if graphemes_raw else "[silence]")
-                    prefix = f"{preview_prefix} · " if preview_prefix else ""
+                prefix = f"{preview_prefix} · " if preview_prefix else ""
-                    job.add_log(f"{prefix}{processed_chars:,}/{job.total_characters or '—'}: {preview_text[:80]}")
+                job.add_log(f"{prefix}{processed_chars:,}/{job.total_characters or '—'}: {preview_text[:80]}")
 
-                    if subtitle_writer and audio_sink and graphemes:
+                if subtitle_writer and audio_sink and graphemes:
-                        subtitle_writer.write_segment(
+                    subtitle_writer.write_segment(
-                            index=subtitle_index,
+                        index=subtitle_index,
-                            text=graphemes,
+                        text=graphemes,
-                            start=current_time,
+                        start=current_time,
-                            end=current_time + duration,
+                        end=current_time + duration,
-                        )
+                    )
-                        subtitle_index += 1
+                    subtitle_index += 1
 
-                    if audio_sink:
+                if audio_sink:
-                        current_time += duration
+                    current_time += duration
 
-            except OverflowError as exc:
-                job.add_log(
-                    f"Skipped chunk — number too large for TTS conversion: {exc}",
-                    level="warning",
-                )
             return local_segments
 
         def append_silence(
@@ -1943,8 +1950,8 @@ def run_conversion_job(job: Job) -> None:
             if chapter_provider == "kokoro":
                 voice_choice = voice_cache.get(chapter_cache_key)
                 if voice_choice is None:
-                    kokoro_backend = get_pipeline("kokoro")
+                    kokoro_pipeline = get_pipeline("kokoro")
-                    voice_choice = _resolve_voice(kokoro_backend, chapter_voice_resolved, job.use_gpu)
+                    voice_choice = _resolve_voice(kokoro_pipeline, chapter_voice_resolved, job.use_gpu)
                     voice_cache[chapter_cache_key] = voice_choice
             else:
                 voice_choice = chapter_voice_resolved
@@ -2088,9 +2095,9 @@ def run_conversion_job(job: Job) -> None:
                         if chunk_provider == "kokoro":
                             chunk_voice_choice = voice_cache.get(chunk_cache_key)
                             if chunk_voice_choice is None:
-                                kokoro_backend = get_pipeline("kokoro")
+                                kokoro_pipeline = get_pipeline("kokoro")
                                 chunk_voice_choice = _resolve_voice(
-                                    kokoro_backend,
+                                    kokoro_pipeline,
                                     chunk_voice_resolved,
                                     job.use_gpu,
                                 )
@@ -2232,8 +2239,8 @@ def run_conversion_job(job: Job) -> None:
                 if fallback_key and fallback_key != "__custom_mix":
                     # `voice_cache` keys are internal and include provider prefixes.
                     outro_voice_spec = fallback_key.split(":", 1)[-1]
-            if not outro_voice_spec:
+            if not outro_voice_spec and VOICES_INTERNAL:
-                outro_voice_spec = get_default_voice("kokoro")
+                outro_voice_spec = VOICES_INTERNAL[0]
 
             if outro_text and outro_voice_spec:
                 outro_start_time = current_time
@@ -2405,11 +2412,6 @@ def run_conversion_job(job: Job) -> None:
 
         # Explicitly release the pipeline and force garbage collection to prevent
         # memory accumulation in the worker process, which can lead to host lockups.
-        for p in pipelines.values():
-            try:
-                p.dispose()
-            except Exception:
-                pass
         pipelines.clear()
         pipeline = None
         gc.collect()
@@ -2443,14 +2445,17 @@ def _load_pipeline(job: Job):
     disable_gpu = not job.use_gpu or not cfg.get("use_gpu", True)
     provider = str(getattr(job, "tts_provider", "kokoro") or "kokoro").strip().lower()
     if provider == "supertonic":
-        return create_pipeline(
+        return SupertonicPipeline(
-            "supertonic",
+            sample_rate=SAMPLE_RATE,
+            auto_download=True,
+            total_steps=int(getattr(job, "supertonic_total_steps", 5) or 5),
         )
 
     device = "cpu"
     if not disable_gpu:
         device = _select_device()
-    return create_pipeline("kokoro", lang_code=job.language, device=device)
+    _np, KPipeline = load_numpy_kpipeline()
+    return KPipeline(lang_code=job.language, repo_id="hexgrad/Kokoro-82M", device=device)
 
 
 def _select_device() -> str:

abogen/webui/debug_tts_runner.py

@@ -15,7 +15,7 @@ from abogen.normalization_settings import build_apostrophe_config
 from abogen.text_extractor import extract_from_path
 from abogen.voice_cache import ensure_voice_assets
 from abogen.webui.conversion_runner import SAMPLE_RATE, SPLIT_PATTERN, _select_device, _to_float32, _resolve_voice, _spec_to_voice_ids
-from abogen.tts_plugin.utils import create_pipeline
+from abogen.utils import load_numpy_kpipeline
 
 
 _MARKER_RE = re.compile(re.escape(MARKER_PREFIX) + r"(?P<code>[A-Z0-9_]+)" + re.escape(MARKER_SUFFIX))
@@ -45,7 +45,8 @@ def _load_pipeline(language: str, use_gpu: bool) -> Any:
     device = "cpu"
     if use_gpu:
         device = _select_device()
-    return create_pipeline("kokoro", lang_code=language, device=device)
+    _np, KPipeline = load_numpy_kpipeline()
+    return KPipeline(lang_code=language, repo_id="hexgrad/Kokoro-82M", device=device)
 
 
 def _extract_cases_from_text(text: str) -> List[Tuple[str, str]]:
@@ -247,8 +248,4 @@ def run_debug_tts_wavs(
         "sample_rate": SAMPLE_RATE,
     }
     (run_dir / "manifest.json").write_text(json.dumps(manifest, indent=2), encoding="utf-8")
-    try:
-        pipeline.dispose()
-    except Exception:
-        pass
     return manifest

abogen/webui/routes/api.py

@@ -34,7 +34,6 @@ from abogen.normalization_settings import (
 )
 from abogen.llm_client import list_models, LLMClientError
 from abogen.kokoro_text_normalization import normalize_for_pipeline
-from abogen.tts_plugin.utils import is_plugin_registered
 from abogen.integrations.audiobookshelf import AudiobookshelfClient, AudiobookshelfConfig
 from abogen.integrations.calibre_opds import (
     CalibreOPDSClient,
@@ -64,7 +63,7 @@ def api_save_voice_profile() -> ResponseReturnValue:
     if profile is None:
         # Speaker Studio payload format
         provider = str(payload.get("provider") or "kokoro").strip().lower()
-        if not is_plugin_registered(provider):
+        if provider not in {"kokoro", "supertonic"}:
             provider = "kokoro"
         if provider == "supertonic":
             profile = {
@@ -231,7 +230,7 @@ def api_speaker_preview() -> ResponseReturnValue:
     use_gpu = settings.get("use_gpu", False)
 
     base_spec, speaker_name = split_profile_spec(voice)
-    resolved_provider = tts_provider if is_plugin_registered(tts_provider) else ""
+    resolved_provider = tts_provider if tts_provider in {"kokoro", "supertonic"} else ""
 
     if speaker_name:
         entry = normalize_profile_entry(load_profiles().get(speaker_name))

abogen/webui/routes/utils/form.py

@@ -7,7 +7,6 @@ from flask.typing import ResponseReturnValue
 
 from abogen.webui.service import PendingJob, JobStatus
 from abogen.webui.routes.utils.service import get_service
-from abogen.tts_plugin.utils import is_plugin_registered
 from abogen.webui.routes.utils.settings import (
     load_settings,
     coerce_bool,
@@ -33,7 +32,7 @@ from abogen.webui.routes.utils.common import split_profile_spec
 from abogen.utils import calculate_text_length
 from abogen.voice_profiles import serialize_profiles, normalize_profile_entry
 from abogen.chunking import ChunkLevel, build_chunks_for_chapters
-from abogen.tts_plugin.utils import get_default_voice
+from abogen.constants import VOICES_INTERNAL
 from abogen.speaker_configs import get_config
 from abogen.kokoro_text_normalization import normalize_roman_numeral_titles
 from dataclasses import dataclass
@@ -580,7 +579,7 @@ def apply_book_step_form(
     # spec (e.g. "speaker:Name" for saved speakers, or a Kokoro mix formula).
     # This enables mixed-provider conversions (e.g. narrator=SuperTonic, characters=Kokoro).
     provider_value = str(form.get("tts_provider") or "").strip().lower()
-    if is_plugin_registered(provider_value):
+    if provider_value in {"kokoro", "supertonic"}:
         pending.tts_provider = provider_value
 
     # Determine the base speaker selection (saved speaker ref or raw voice).
@@ -617,8 +616,8 @@ def apply_book_step_form(
         custom_formula = ""
 
     base_voice_spec = resolved_default_voice or narrator_voice_raw
-    if not base_voice_spec:
+    if not base_voice_spec and VOICES_INTERNAL:
-        base_voice_spec = get_default_voice("kokoro")
+        base_voice_spec = VOICES_INTERNAL[0]
 
     voice_choice, resolved_language, selected_profile = resolve_voice_choice(
         pending.language,
@@ -797,8 +796,8 @@ def build_pending_job_from_extraction(
         profile_selection = inferred_profile
 
     base_voice = base_voice_input or resolved_default_voice or str(default_voice_setting).strip()
-    if not base_voice:
+    if not base_voice and VOICES_INTERNAL:
-        base_voice = get_default_voice("kokoro")
+        base_voice = VOICES_INTERNAL[0]
     selected_speaker_config = (form.get("speaker_config") or "").strip()
     speaker_config_payload = get_config(selected_speaker_config) if selected_speaker_config else None
 

abogen/webui/routes/utils/preview.py

@@ -14,17 +14,6 @@ _preview_pipelines: Dict[Tuple[str, str], Any] = {}
 _preview_pipeline_lock = threading.Lock()
 
 
-def clear_preview_pipelines() -> None:
-    """Dispose all cached preview pipelines and clear the cache."""
-    with _preview_pipeline_lock:
-        for pipeline in _preview_pipelines.values():
-            try:
-                pipeline.dispose()
-            except Exception:
-                pass
-        _preview_pipelines.clear()
-
-
 def _select_device() -> str:
     import platform
 
@@ -89,9 +78,10 @@ def get_preview_pipeline(language: str, device: str) -> Any:
         pipeline = _preview_pipelines.get(key)
         if pipeline is not None:
             return pipeline
-        from abogen.tts_plugin.utils import create_pipeline
+        from abogen.utils import load_numpy_kpipeline
 
-        pipeline = create_pipeline("kokoro", lang_code=language, device=device)
+        _, KPipeline = load_numpy_kpipeline()
+        pipeline = KPipeline(lang_code=language, repo_id="hexgrad/Kokoro-82M", device=device)
         _preview_pipelines[key] = pipeline
         return pipeline
 
@@ -147,9 +137,9 @@ def generate_preview_audio(
             normalized_text = source_text
 
     if provider == "supertonic":
-        from abogen.tts_plugin.utils import create_pipeline
+        from abogen.tts_supertonic import SupertonicPipeline
 
-        pipeline = create_pipeline("supertonic")
+        pipeline = SupertonicPipeline(sample_rate=SAMPLE_RATE, auto_download=True, total_steps=supertonic_total_steps)
         segments = pipeline(
             normalized_text,
             voice=voice_spec,

abogen/webui/routes/utils/settings.py

@@ -6,8 +6,8 @@ from abogen.constants import (
     LANGUAGE_DESCRIPTIONS,
     SUBTITLE_FORMATS,
     SUPPORTED_SOUND_FORMATS,
+    VOICES_INTERNAL,
 )
-from abogen.tts_plugin.utils import get_default_voice
 from abogen.normalization_settings import (
     DEFAULT_LLM_PROMPT,
     environment_llm_defaults,
@@ -174,7 +174,7 @@ def settings_defaults() -> Dict[str, Any]:
         "subtitle_format": "srt",
         "save_mode": "default_output" if has_output_override() else "save_next_to_input",
         "default_speaker": "",
-        "default_voice": get_default_voice("kokoro"),
+        "default_voice": VOICES_INTERNAL[0] if VOICES_INTERNAL else "",
         "supertonic_total_steps": 5,
         "supertonic_speed": 1.0,
         "replace_single_newlines": False,

abogen/webui/routes/utils/voice.py

@@ -17,10 +17,10 @@ from abogen.constants import (
     SUPPORTED_SOUND_FORMATS,
     SUPPORTED_LANGUAGES_FOR_SUBTITLE_GENERATION,
     SAMPLE_VOICE_TEXTS,
+    VOICES_INTERNAL,
 )
-from abogen.tts_plugin.utils import get_voices
 from abogen.speaker_configs import list_configs
-from abogen.tts_plugin.utils import create_pipeline
+from abogen.utils import load_numpy_kpipeline
 from abogen.webui.conversion_runner import _select_device, _to_float32, SAMPLE_RATE, SPLIT_PATTERN
 
 _preview_pipeline_lock = threading.RLock()
@@ -285,7 +285,7 @@ def filter_voice_catalog(
 def build_voice_catalog() -> List[Dict[str, str]]:
     catalog: List[Dict[str, str]] = []
     gender_map = {"f": "Female", "m": "Male"}
-    for voice_id in get_voices("kokoro"):
+    for voice_id in VOICES_INTERNAL:
         prefix, _, rest = voice_id.partition("_")
         language_code = prefix[0] if prefix else "a"
         gender_code = prefix[1] if len(prefix) > 1 else ""
@@ -590,7 +590,7 @@ def template_options() -> Dict[str, Any]:
     voice_catalog = build_voice_catalog()
     return {
         "languages": LANGUAGE_DESCRIPTIONS,
-        "voices": get_voices("kokoro"),
+        "voices": VOICES_INTERNAL,
         "subtitle_formats": SUBTITLE_FORMATS,
         "supported_langs_for_subs": SUPPORTED_LANGUAGES_FOR_SUBTITLE_GENERATION,
         "output_formats": SUPPORTED_SOUND_FORMATS,
@@ -741,7 +741,8 @@ def get_preview_pipeline(language: str, device: str):
         pipeline = _preview_pipelines.get(key)
         if pipeline is not None:
             return pipeline
-        pipeline = create_pipeline("kokoro", lang_code=language, device=device)
+        _, KPipeline = load_numpy_kpipeline()
+        pipeline = KPipeline(lang_code=language, repo_id="hexgrad/Kokoro-82M", device=device)
         _preview_pipelines[key] = pipeline
         return pipeline
 

abogen/webui/routes/voices.py

@@ -17,7 +17,7 @@ from abogen.speaker_configs import (
     save_configs,
     delete_config,
 )
-
+from abogen.constants import VOICES_INTERNAL
 
 voices_bp = Blueprint("voices", __name__)
 

docs/contributing.md

@@ -1,55 +0,0 @@
-# Contributing to Abogen
-
-We welcome contributions to Abogen!
-
-## How to Contribute
-
-1. Fork the repository
-2. Create a branch for your feature
-3. Make your changes
-4. Write tests
-5. Submit a pull request
-
-## Code Standards
-
-- Follow PEP 8 for Python
-- Use TypeScript for JavaScript
-- Type hints required for new Python code
-- Document complex logic with comments
-
-## Plugin Architecture
-
-When contributing TTS engines, implement the **Plugin Architecture** contract.
-
-See [Developer Guide](developer-guide.md#5-adding-a-new-plugin) for:
-- Required exports (`PLUGIN_MANIFEST`, `MODEL_REQUIREMENTS`, `create_engine`)
-- Engine / EngineSession contracts
-- Capability interfaces (`VoiceLister`, `PreviewGenerator`, etc.)
-- Step-by-step plugin creation guide
-
-## Testing
-
-```bash
-# All tests
-pytest
-
-# Contract tests (architectural compliance)
-pytest tests/contracts/
-
-# Behavioral regression tests
-pytest tests/test_behavioral_regression.py
-```
-
-## Documentation
-
-- Update relevant docs in `docs/` when changing architecture or APIs
-- Add docstrings to all public functions/classes
-- Follow existing documentation style
-
-## Pull Request Checklist
-
-- [ ] Tests pass (`pytest`)
-- [ ] Code follows style guide (`ruff check`, `ruff format`)
-- [ ] Documentation updated
-- [ ] No legacy architecture references (`TTSBackend`, `register_backend`, `TTSBackendRegistry`)
-- [ ] Uses new Plugin Architecture patterns

docs/developer-guide.md

@@ -1,270 +0,0 @@
-# TTS Plugin Architecture — Architectural Reference
-
-This document describes the **stable architectural contracts** of the TTS Plugin Architecture. It documents invariants that only change when the architecture itself changes.
-
----
-
-## 1. Architecture Overview
-
-```
-┌─────────────────────────────────────────────────────────────────┐
-│                        Host Application                         │
-│  ┌─────────────┐  ┌──────────────┐  ┌────────────────────────┐  │
-│  │ Plugin      │  │ HostContext  │  │ Plugin Discovery       │  │
-│  │ Manager     │──│ (config_dir, │  │ (plugin directories)   │  │
-│  │             │  │  logger,     │  │                        │  │
-│  │ - discover  │  │  http_client)│  └────────────────────────┘  │
-│  │ - validate  │  └──────────────┘            │                 │
-│  │ - activate  │                              ▼                 │
-│  │ - dispose   │  ┌─────────────────────────────────────────┐   │
-│  └──────┬──────┘  │              Plugin Package             │   │
-│         │         │  ┌──────────────┐ ┌─────────────────┐   │   │
-│         ▼         │  │ PLUGIN_      │ │ MODEL_          │   │   │
-│  ┌────────────┐   │  │ MANIFEST     │ │ REQUIREMENTS    │   │   │
-│  │   Engine   │◄──┤  │ create_engine│ │                 │   │   │
-│  └──────┬─────┘   │  └──────────────┘ └─────────────────┘   │   │
-│         │         └─────────────────────────────────────────┘   │
-│         │ createSession()                                       │
-│         ▼                                                       │
-│  ┌─────────────┐                                                │
-│  │EngineSession│                                                │
-│  └──────┬──────┘                                                │
-│         │ synthesize()                                          │
-│         ▼                                                       │
-│  ┌────────────────┐                                             │
-│  │SynthesizedAudio│                                             │
-│  └────────────────┘                                             │
-└─────────────────────────────────────────────────────────────────┘
-```
-
-### Core Components
-
-| Component | Responsibility |
-|-----------|----------------|
-| **PluginManifest** | Static metadata: id, name, version, api_version, capabilities, engine manifest |
-| **EngineManifest** | Voice sources, parameters, audio formats |
-| **HostContext** | Minimal host services: config_dir, logger, http_client |
-| **Engine** | Stateless factory for sessions; thread-safe `createSession()` |
-| **EngineSession** | Owns mutable execution state; not thread-safe |
-| **PluginManager** | Discovers, validates, and manages plugin lifecycle |
-| **Capabilities** | Optional interfaces: VoiceLister, PreviewGenerator, StreamingSynthesizer, CancelableSession |
-
----
-
-## 2. Ownership Model
-
-### Engine Ownership
-```
-PluginManager.create_engine() → Engine
-```
-- **PluginManager** creates and caches engines
-- **Caller** receives `Engine` instance
-- **Caller** must dispose all sessions **before** disposing engine
-- **Engine.dispose()** releases engine resources
-- After `Engine.dispose()`: all methods except `dispose()` raise `EngineError`
-
-### Session Ownership
-```
-Engine.createSession() → EngineSession
-```
-- **Engine** creates session
-- **Ownership transfers to caller** immediately
-- **Caller** is responsible for `session.dispose()`
-- **Engine does NOT track sessions** — no registry, no callbacks
-- After `session.dispose()`: all methods except `dispose()` raise `EngineError`
-
-### Disposal Order (Invariant)
-```python
-# Correct
-engine = manager.create_engine("id")
-session = engine.createSession()
-try:
-    audio = session.synthesize(request)
-finally:
-    session.dispose()      # 1. Sessions FIRST
-engine.dispose()           # 2. Then engine
-
-# INCORRECT — violates contract (undefined behavior)
-engine.dispose()
-session.synthesize(request)  # EngineError
-```
-
----
-
-## 3. Lifecycle State Machine
-
-```
-DISCOVERY
-  PluginManager.discover(plugin_dirs)
-  → Loads PLUGIN_MANIFEST, MODEL_REQUIREMENTS
-  → Validates api_version (major must match)
-  → Validates declared capabilities are implemented
-
-MODEL_DOWNLOAD (if MODEL_REQUIREMENTS non-empty)
-  Host reads MODEL_REQUIREMENTS
-  Downloads/caches models
-  Resolves model_path
-
-ACTIVATION
-  create_engine(context, model_path, config)
-  → Atomic: succeeds fully or raises EngineError
-  → Returns Engine
-
-SESSION_CREATION
-  engine.createSession() → EngineSession
-  → Ownership transfers to caller
-  → Raises EngineError on failure
-  → Never returns partial session
-
-SYNTHESIS
-  session.synthesize(request)
-  → Returns SynthesizedAudio
-  → Raises EngineError on failure
-  → Session remains usable after error
-
-SESSION_DISPOSAL
-  session.dispose()
-  → Idempotent, never raises
-  → After: all methods raise EngineError
-
-DEACTIVATION
-  engine.dispose()
-  → Caller MUST dispose all sessions first
-  → Idempotent, never raises
-  → After: all methods raise EngineError
-```
-
----
-
-## 4. Protocol Contracts
-
-### Engine (Protocol)
-```python
-@runtime_checkable
-class Engine(Protocol):
-    def createSession(self) -> EngineSession:
-        """Create a new session. Thread-safe. Transfers ownership."""
-        ...
-
-    def dispose(self) -> None:
-        """Release engine resources.
-        Caller must dispose all sessions first.
-        Idempotent, never raises.
-        After: all methods except dispose() raise EngineError."""
-        ...
-```
-
-### EngineSession (Protocol)
-```python
-@runtime_checkable
-class EngineSession(Protocol):
-    def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio:
-        """Synthesize audio.
-        Returns SynthesizedAudio or raises EngineError.
-        Session remains usable after error."""
-        ...
-
-    def dispose(self) -> None:
-        """Release session resources.
-        Idempotent, never raises.
-        After: all methods except dispose() raise EngineError."""
-        ...
-```
-
-### Capability Protocols (Optional)
-- **VoiceLister**: `listVoices(source_id: str) -> list[VoiceManifest]`
-- **PreviewGenerator**: `generatePreview(voice: VoiceSelection, text: str) -> SynthesizedAudio`
-- **StreamingSynthesizer**: `synthesizeStream(request: SynthesisRequest) -> Iterator[bytes]`
-- **CancelableSession**: `cancel() -> None` (causes in-flight synthesize to raise `CancelledError`)
-
----
-
-## 5. Error Semantics
-
-```
-EngineError (base)
-├── ModelNotFoundError      # Required model not found
-├── ModelLoadError          # Model failed to load
-├── NetworkError            # Network operation failed
-├── InvalidInputError       # Request validation failed
-├── ConfigurationError      # Invalid configuration
-├── CancelledError          # Operation cancelled via CancelableSession
-└── InternalError           # Unexpected internal failure
-```
-
-### When Each Is Raised
-| Error | Raised By | Conditions |
-|-------|-----------|------------|
-| `ModelNotFoundError` | `create_engine()` | Required model not found at `model_path` |
-| `ModelLoadError` | `create_engine()` | Model exists but fails to load |
-| `NetworkError` | `synthesize()`, `create_engine()` | Network call fails (cloud engines) |
-| `InvalidInputError` | `synthesize()` | Request validation fails (empty text, invalid voice, etc.) |
-| `ConfigurationError` | `create_engine()` | Config values invalid for this engine |
-| `CancelledError` | `synthesize()`, `synthesizeStream()` | `CancelableSession.cancel()` called |
-| `InternalError` | Any | Unexpected internal failure (bug) |
-
-### Dispose Contract
-- `dispose()` is **idempotent** and **never raises**
-- After `dispose()`: all methods except `dispose()` raise `EngineError`
-- Engine: caller must dispose all sessions first; violating this is undefined behavior
-
----
-
-## 6. Capabilities
-
-| Capability | Interface | Enables |
-|------------|-----------|---------|
-| `voice_list` | `VoiceLister` | `listVoices(source_id)` — enumerate available voices |
-| `preview` | `PreviewGenerator` | `generatePreview(voice, text)` — preview without session |
-| `streaming` | `StreamingSynthesizer` | `synthesizeStream(request)` — chunked audio output |
-| `cancel` | `CancelableSession` | `cancel()` — interrupt in-flight synthesis |
-
-Plugins declare capabilities in `PluginManifest.capabilities`. Host validates at load time.
-
----
-
-## 7. Contract Tests
-
-**Location**: `tests/contracts/`
-
-**Purpose**: Verify every plugin satisfies the architectural contracts.
-
-**Guarantees**:
-- Required exports exist (`PLUGIN_MANIFEST`, `MODEL_REQUIREMENTS`, `create_engine`)
-- `create_engine` is atomic
-- `Engine.createSession()` transfers ownership, never returns partial
-- `dispose()` is idempotent on Engine and EngineSession
-- After `dispose()`, methods raise `EngineError`
-- `synthesize()` raises typed `EngineError` subtypes, session remains usable
-- Declared capabilities are actually implemented
-- Plugin loader validates manifest, api_version, capabilities
-
-**Run**: `pytest tests/contracts/ -v`
-
----
-
-## 8. Behavioral Tests
-
-**Location**: `tests/test_behavioral_regression.py`
-
-**Purpose**: Verify user-facing behavior via public API only (`create_pipeline`, `Engine`, `EngineSession`, `PluginManager`).
-
-**Scope**:
-- Synthesis with various inputs (short, long, empty, unicode, mixed scripts)
-- Voice selection and listing
-- Parameter handling (speed, etc.)
-- Error scenarios (unknown plugin, disposal, etc.)
-- Resource cleanup (dispose idempotency, no leaks)
-- Pipeline utility (`create_pipeline`)
-
-**Run**: `pytest tests/test_behavioral_regression.py -v`
-
----
-
-## 9. Reference
-
-- **Architecture Spec**: `docs/architecture-final-v2.md`
-- **Amendment (lang_code)**: `docs/architecture-amendment-001.md`
-- **Migration Roadmap**: `docs/migration-roadmap.md`
-- **Plugin Examples**: `plugins/kokoro/`, `plugins/supertonic/`
-- **Protocol Definitions**: `abogen/tts_plugin/engine.py`, `abogen/tts_plugin/capabilities.py`

docs/getting-started.md

@@ -1,68 +0,0 @@
-# Getting Started
-
-Quickstart for developers working on Abogen.
-
-## Prerequisites
-
-- Python 3.10+
-- Node.js 20+
-- npm 10+
-- Git
-- Docker (optional)
-
-## Installation
-
-```bash
-# Development install with all extras
-pip install -e .[dev]
-
-# Or with uv
-uv pip install -e .[dev]
-```
-
-## Running the Application
-
-```bash
-# Desktop GUI
-abogen
-
-# Web UI
-abogen-web
-
-# CLI
-abogen-cli
-```
-
-## Project Structure
-
-```
-abogen/
-├── pyqt/         - PyQt6 desktop GUI
-├── webui/        - Flask web UI
-├── tts_plugin/   - Plugin Architecture (Engine, EngineSession, Manifest)
-└── plugins/      - Built-in plugins (kokoro, supertonic)
-tests/
-├── contracts/    - Contract compliance tests
-└── ...
-```
-
-## Testing
-
-```bash
-# All tests
-pytest
-
-# Contract tests (architectural compliance)
-pytest tests/contracts/
-
-# Behavioral regression tests
-pytest tests/test_behavioral_regression.py
-```
-
-## Architecture
-
-See [Developer Guide](developer-guide.md) for Plugin Architecture details:
-- Engine / EngineSession lifecycle
-- Plugin contract (PLUGIN_MANIFEST, create_engine)
-- Adding new plugins
-- Capability interfaces

docs/testing.md

@@ -1,269 +0,0 @@
-# Testing Guide
-
-This document describes the testing strategy for Abogen's Plugin Architecture.
-
-## Test Categories
-
-### 0. Auto-Discovery Plugin Tests (`tests/plugins/`)
-
-**Purpose**: Automatically test every plugin in `plugins/` directory without manual test creation. These tests use discovery to find all plugins and run generic tests against each one.
-
-**What They Test**:
-- **Manifest structure**: Required fields, API version format, voices field
-- **Engine lifecycle**: `create_engine`, `dispose` idempotency, post-dispose behavior
-- **Capability implementation**: Declared capabilities are implemented (e.g., `voice_list` → `VoiceLister`)
-
-**How Auto-Discovery Works**:
-```python
-# tests/plugins/conftest.py
-@pytest.fixture(scope="module")
-def plugin_ids(plugins_dir: Path) -> list[str]:
-    """Discovers all plugin directories with __init__.py"""
-    return [item.name for item in plugins_dir.iterdir() 
-            if item.is_dir() and (item / "__init__.py").exists()]
-```
-
-**Test Structure**:
-```
-tests/plugins/
-├── conftest.py              # Fixtures: plugin_ids, loaded_plugin, host_context
-└── test_all_plugins.py      # Generic tests for every plugin
-    ├── TestAllPluginsManifest
-    ├── TestAllPluginsEngine
-    └── TestAllPluginsCapabilities
-```
-
-**Running Auto-Discovery Tests**:
-```bash
-# Test all plugins automatically
-pytest tests/plugins/ -v
-
-# Test specific plugin
-pytest tests/plugins/ -v -k "kokoro"
-
-# See which plugins were discovered
-pytest tests/plugins/ --collect-only
-```
-
-**Adding a New Plugin**:
-1. Create plugin directory: `plugins/my_plugin/`
-2. Add `__init__.py` with `PLUGIN_MANIFEST`, `MODEL_REQUIREMENTS`, `create_engine`
-3. Run `pytest tests/plugins/` — tests automatically discover and test your plugin!
-
-**When to Add Plugin-Specific Tests**:
-Auto-discovery tests cover generic contract validation. Create plugin-specific tests in `tests/test_<plugin>_plugin.py` for:
-- Integration with real dependencies (e.g., KPipeline for Kokoro)
-- Specific voice IDs and behavior
-- Plugin-specific parameters and features
-
----
-
-### 1. Contract Tests (`tests/contracts/`)
-
-**Purpose**: Verify that every plugin satisfies the architectural contract. These tests ensure the Plugin Architecture's invariants are maintained.
-
-**What They Guarantee**:
-- Every plugin exports `PLUGIN_MANIFEST`, `MODEL_REQUIREMENTS`, `create_engine`
-- `create_engine` is atomic (succeeds fully or raises and cleans up)
-- `Engine.createSession()` returns valid `EngineSession`, transfers ownership
-- `Engine.dispose()` is idempotent, never raises
-- After `dispose()`, all methods raise `EngineError`
-- `EngineSession.synthesize()` returns `SynthesizedAudio` or raises `EngineError` (session remains usable)
-- `EngineSession.dispose()` is idempotent, never raises
-- Capability interfaces (`VoiceLister`, `PreviewGenerator`, etc.) are correctly implemented
-- Plugin Loader discovers, validates, and loads plugins correctly
-- Plugin Manager creates, caches, and disposes engines correctly
-- Value objects are immutable and have correct equality semantics
-- Error hierarchy is preserved (`EngineError` base with subtypes)
-
-**Why They Exist**:
-- Provide **compile-time-like guarantees** for a dynamic plugin system
-- Enable **safe plugin ecosystem** — host can trust any loaded plugin
-- Catch **architectural violations** early (missing dispose, wrong return types, etc.)
-- Document the **contract** in executable form
-
-**What Every New Plugin Must Pass**:
-```bash
-pytest tests/contracts/ -v
-# All tests must pass
-```
-
-**Running Contract Tests**:
-```bash
-# All contract tests
-pytest tests/contracts/
-
-# Specific contract
-pytest tests/contracts/test_engine_contract.py
-
-# With coverage
-pytest tests/contracts/ --cov=abogen.tts_plugin
-```
-
----
-
-### 2. Behavioral Tests (`tests/test_behavioral_regression.py`)
-
-**Purpose**: Verify external user-facing behavior using only public API. These tests are **not coupled to internal implementation**.
-
-**What They Test**:
-- Synthesis with various inputs (short, long, empty, unicode, mixed scripts)
-- Voice selection and listing
-- Parameter handling (speed, etc.)
-- Error scenarios (unknown plugin, disposal, etc.)
-- Resource cleanup (dispose idempotency, no leaks)
-- Pipeline utility (`create_pipeline`)
-
-**Why They Test Public Behavior Only**:
-- **Refactoring safety**: Internal changes don't break tests
-- **Real-world usage**: Tests match how consumers actually use the API
-- **Plugin agnostic**: Parametrized across Kokoro, SuperTonic, and mock plugins
-- **Regression detection**: Catch behavioral regressions regardless of implementation
-
-**What They Don't Test**:
-- Internal class structure
-- Private methods
-- Implementation details (how audio is generated, model loading internals)
-
-**Running Behavioral Tests**:
-```bash
-# All behavioral tests
-pytest tests/test_behavioral_regression.py -v
-
-# With specific plugin (if installed)
-pytest tests/test_behavioral_regression.py -v -k "kokoro"
-```
-
----
-
-### 4. Unit Tests (`tests/`)
-
-**Purpose**: Test individual modules in isolation.
-
-**Examples**:
-- `test_book_parser.py` — EPUB/PDF/text parsing
-- `test_text_normalization.py` — Text preprocessing
-- `test_chunk_helpers.py` — Text chunking logic
-- `test_voice_cache.py` — Voice caching
-
----
-
-### 5. Integration Tests
-
-**Purpose**: Test cross-component interactions.
-
-**Examples**:
-- `test_kokoro_plugin.py` — Full Kokoro plugin integration
-- `test_supertonic_plugin.py` — Full SuperTonic plugin integration
-- `test_conversion_series.py` — End-to-end conversion pipeline
-
----
-
-## Test Architecture
-
-```
-tests/
-├── contracts/           # Contract tests (architectural compliance)
-│   ├── conftest.py      # Shared fixtures (FakeEngine, FakeSession)
-│   ├── test_manifest_contract.py
-│   ├── test_plugin_contract.py
-│   ├── test_engine_contract.py
-│   ├── test_session_contract.py
-│   ├── test_capabilities_contract.py
-│   ├── test_loader_contract.py
-│   ├── test_plugin_manager_contract.py
-│   ├── test_types_contract.py
-│   ├── test_errors_contract.py
-│   ├── test_host_context_contract.py
-│   └── test_integration.py
-├── test_behavioral_regression.py  # Behavioral tests (public API)
-├── test_kokoro_plugin.py          # Kokoro integration
-├── test_supertonic_plugin.py      # SuperTonic integration
-└── ...                            # Other unit/integration tests
-```
-
----
-
-## Adding Tests for a New Plugin
-
-### Auto-Discovery Tests (Automatic!)
-
-**No manual test creation required!** When you add a new plugin to `plugins/`:
-
-1. Create plugin directory: `plugins/my_plugin/`
-2. Add `__init__.py` with required exports:
-   ```python
-   PLUGIN_MANIFEST = PluginManifest(...)
-   MODEL_REQUIREMENTS = [...]
-   def create_engine(...): ...
-   ```
-3. Run `pytest tests/plugins/` — auto-discovery tests automatically find and test your plugin!
-
-**What's Tested Automatically**:
-- Manifest structure and required fields
-- API version compatibility
-- Engine creation and dispose contract
-- Capability implementation (if declared)
-
-### Plugin-Specific Tests (Optional)
-
-Create `tests/test_my_plugin_plugin.py` for:
-- Integration with real backend (e.g., KPipeline for Kokoro)
-- Specific voice IDs and behavior
-- Plugin-specific parameters and features
-
-### Contract Tests (Deprecated for New Plugins)
-
-**Note**: Auto-discovery tests (`tests/plugins/`) now cover contract validation for all plugins. Manual contract tests in `tests/contracts/` are only needed for testing internal architecture components.
-
-### Behavioral Tests (Recommended)
-
-Add parametrized tests to `tests/test_behavioral_regression.py`:
-
-```python
-# In _plugin_ids list, add your plugin
-_plugin_ids = ["kokoro", "supertonic", "my_plugin"]
-_plugin_engines["my_plugin"] = _YourMockEngine
-_plugin_default_voices["my_plugin"] = "voice1"
-_plugin_all_voices["my_plugin"] = ["voice1", "voice2"]
-```
-
-All existing behavioral tests will automatically run against your plugin.
-
----
-
-## Continuous Integration
-
-```yaml
-# .github/workflows/test.yml
-- name: Contract Tests
-  run: pytest tests/contracts/ -v
-
-- name: Behavioral Tests
-  run: pytest tests/test_behavioral_regression.py -v
-
-- name: Unit & Integration Tests
-  run: pytest tests/ -v --ignore=tests/test_behavioral_regression.py
-```
-
----
-
-## Test Design Principles
-
-### Contract Tests
-- **No mocks** for the system under test (test real plugin loading)
-- **Strict assertions** on types and behavior
-- **Document architecture** in test names and docstrings
-- **Fail fast** on architectural violations
-
-### Behavioral Tests
-- **Only public API** (`create_pipeline`, `Engine`, `EngineSession`, `PluginManager`)
-- **Parametrized** across plugins
-- **Realistic scenarios** (long text, unicode, mixed scripts)
-- **No implementation coupling** (test behavior, not internals)
-
-### General
-- **Fast**: Unit tests < 1s, Contract tests < 5s, Behavioral < 30s
-- **Isolated**: No shared state between tests
-- **Deterministic**: Same input → same output
-- **Descriptive names**: `test_<component>_<scenario>_<expected>`

docs/tts-plugin-architecture.md

@@ -1,689 +0,0 @@
-# TTS Plugin Architecture — Final Specification
-
-## 1. Core Domain
-
-Zero dependencies. Pure business logic.
-
-### 1.1 Engine
-
-Factory for sessions. Stateless. Thread-safe for createSession().
-
-```
-interface Engine:
-  createSession() -> EngineSession
-  dispose() -> void
-```
-
-**createSession() contract**:
-- Returns: EngineSession
-- Raises: EngineError on failure
-- Ownership: Transfers to caller
-- Thread-safe: Yes
-
-**dispose() contract**:
-- Releases engine resources
-- Caller must ensure all sessions created by this engine are disposed before calling dispose()
-- Disposing an engine while any session is still alive violates the API contract; behavior is undefined
-- Idempotent: Safe to call multiple times
-- Never raises: Catches and logs internally
-- After dispose(): All methods except dispose() raise EngineError
-
-### 1.2 EngineSession
-
-Owns mutable execution state isolated from other concurrent work. NOT thread-safe.
-
-```
-interface EngineSession:
-  synthesize(request: SynthesisRequest) -> SynthesizedAudio
-  dispose() -> void
-```
-
-**synthesize() contract**:
-- Returns: SynthesizedAudio
-- Raises: EngineError on failure (session remains usable)
-- Thread-safe: No
-
-**dispose() contract**:
-- Releases session resources
-- Idempotent: Safe to call multiple times
-- Never raises: Catches and logs internally
-- After dispose(): All methods except dispose() raise EngineError
-
-### 1.3 SynthesisRequest
-
-Immutable value object.
-
-```
-SynthesisRequest:
-  text: string
-  voice: VoiceSelection
-  parameters: ParameterValues
-  format: AudioFormat
-```
-
-### 1.4 SynthesizedAudio
-
-Immutable value object.
-
-```
-SynthesizedAudio:
-  data: bytes
-  format: AudioFormat
-  duration: Duration
-```
-
-### 1.5 VoiceSelection
-
-Immutable value object. Opaque to engine.
-
-```
-VoiceSelection:
-  source: string
-  key: string
-  payload: any = None  # Optional; required for clone/blend sources
-```
-
-### 1.6 ParameterValues
-
-Immutable value object. Behaves like Mapping[str, Any].
-
-```
-ParameterValues:
-  values: Mapping[str, Any]
-```
-
-### 1.7 AudioFormat
-
-Immutable value object.
-
-```
-AudioFormat:
-  mime: string
-  extension: string
-```
-
-### 1.8 Duration
-
-Immutable value object.
-
-```
-Duration:
-  seconds: number
-```
-
-### 1.9 EngineConfig
-
-Engine initialization settings only. No resource references.
-
-```
-EngineConfig:
-  device: string    # "cpu", "cuda:0", etc.
-  # Engine-specific settings (if any)
-  # Unknown keys are ignored (no error)
-```
-
----
-
-## 2. Error Hierarchy
-
-Typed exceptions. Engines raise EngineError or subtypes. Never raw exceptions.
-
-```
-EngineError (base)
-├── ModelNotFoundError
-├── ModelLoadError
-├── NetworkError
-├── InvalidInputError
-├── ConfigurationError
-├── CancelledError
-└── InternalError
-```
-
-**Contract**:
-- synthesize() raises EngineError on failure, session remains usable
-- dispose() never raises (catches and logs internally)
-- create_engine() raises EngineError on failure, cleans up partially created resources
-- createSession() raises EngineError on failure, no partially initialized session returned
-- cancel() causes synthesize() to raise CancelledError
-
----
-
-## 3. Capability Interfaces (Optional)
-
-Engines implement only what they support. Capabilities are additive.
-
-### 3.1 VoiceLister
-
-```
-interface VoiceLister:
-  listVoices(sourceId: string) -> list[VoiceManifest]
-```
-
-### 3.2 PreviewGenerator
-
-```
-interface PreviewGenerator:
-  generatePreview(voice: VoiceSelection, text: string) -> SynthesizedAudio
-```
-
-### 3.3 ModelRequirements
-
-Static at plugin level, not engine level. Host reads before creating engine.
-
-```
-MODEL_REQUIREMENTS = list[ModelManifest]
-```
-
-### 3.4 StreamingSynthesizer
-
-Optional capability of EngineSession, not Engine.
-
-```
-interface StreamingSynthesizer:
-  synthesizeStream(request: SynthesisRequest) -> Iterator[bytes]
-```
-
-**Iterator contract**:
-- Yields audio chunks as they become available
-- Raises CancelledError if cancel() is called during iteration
-- Raises EngineError on synthesis failure
-- Iterator exhaustion = synthesis complete
-- Session remains usable after iterator completes
-
-### 3.5 CancelableSession
-
-Optional capability for engines that support cancellation.
-
-```
-interface CancelableSession:
-  cancel() -> void
-```
-
-**cancel() contract**:
-- Cancels in-progress synthesize()
-- synthesize() raises CancelledError (subtype of EngineError)
-- EngineSession remains usable after cancellation (unless implementation documents otherwise)
-
----
-
-## 4. Plugin Manifest
-
-Static metadata. Immutable. No dependencies.
-
-### 4.1 PluginManifest
-
-```
-PluginManifest:
-  id: string
-  name: string
-  version: string
-  api_version: string  # semver format: MAJOR.MINOR
-  description: string
-  author: string
-  capabilities: list[string]
-  requires: RequirementManifest
-  engine: EngineManifest
-```
-
-**api_version contract**:
-- Format: semver (MAJOR.MINOR)
-- Compatibility: Host rejects plugin if major version differs
-- Minor version: backward compatible, Host accepts higher minor
-
-### 4.2 EngineManifest
-
-```
-EngineManifest:
-  voiceSources: list[VoiceSourceManifest]
-  parameters: list[ParameterManifest]
-  audioFormats: list[AudioFormatManifest]
-```
-
-### 4.3 VoiceSourceManifest
-
-```
-VoiceSourceManifest:
-  id: string
-  name: string
-  type: string    # "list", "speaker_id", "clone", "blend", "generate", "none"
-  config: any
-```
-
-### 4.4 VoiceManifest
-
-```
-VoiceManifest:
-  id: string
-  name: string
-  tags: list[string]
-```
-
-### 4.5 ParameterManifest
-
-```
-ParameterManifest:
-  id: string
-  name: string
-  description: string
-  type: string    # "float", "int", "string", "boolean", "enum"
-  default: any
-  min: number (optional)
-  max: number (optional)
-  step: number (optional)
-  options: list[EnumOption] (optional)
-  unit: string (optional)
-  group: string (optional)
-```
-
-### 4.6 AudioFormatManifest
-
-```
-AudioFormatManifest:
-  mime: string
-  extension: string
-```
-
-### 4.7 EnumOption
-
-```
-EnumOption:
-  value: string
-  label: string
-```
-
-### 4.8 RequirementManifest
-
-```
-RequirementManifest:
-  gpu: GpuRequirement (optional)
-  memory: number (optional)
-  internet: boolean (optional)
-```
-
-### 4.9 GpuRequirement
-
-```
-GpuRequirement:
-  required: boolean
-  type: string (optional)
-  memory: number (optional)
-```
-
-### 4.10 ModelManifest
-
-```
-ModelManifest:
-  id: string
-  name: string
-  size: string
-```
-
----
-
-## 5. Host Services
-
-### 5.1 HostContext
-
-Minimal. 3 fields maximum. No business logic.
-
-```
-HostContext:
-  config_dir: Path      # For API keys, preferences
-  logger: Logger        # For logging
-  http_client: HttpClient  # For network requests
-```
-
----
-
-## 6. Plugin Contract
-
-### 6.1 Plugin Exports
-
-```python
-# plugins/kokoro/__init__.py
-
-PLUGIN_MANIFEST = PluginManifest(...)
-MODEL_REQUIREMENTS = [...]  # Static at plugin level
-
-def create_engine(
-  context: HostContext,
-  model_path: Path | None,
-  config: EngineConfig
-) -> Engine:
-  """Create engine. Atomic: succeeds fully or raises and cleans up."""
-  ...
-```
-
-### 6.2 create_engine() Contract
-
-- Parameters:
-  - context: HostContext (host services)
-  - model_path: Path | None (resolved model path, or None for cloud/no-model engines)
-  - config: EngineConfig (engine initialization settings)
-- Returns: Engine
-- Raises: EngineError on failure
-- Atomic: Succeeds fully or cleans up and raises
-- Thread-safe: Can be called from any thread
-
----
-
-## 7. Object Lifecycle
-
-### 7.1 Engine Lifecycle
-
-```
-1. DISCOVERY
-   Host scans plugin directories
-   Loads PLUGIN_MANIFEST and MODEL_REQUIREMENTS
-
-2. MODEL DOWNLOAD (if MODEL_REQUIREMENTS non-empty)
-   Host reads MODEL_REQUIREMENTS
-   Downloads/caches required models
-   Resolves model_path for create_engine()
-
-3. ACTIVATION
-   Host calls create_engine(context, model_path, config)
-   Engine created, ready to use
-   Raises EngineError on failure
-
-4. SESSION CREATION
-   Client calls engine.createSession()
-   Returns EngineSession
-   Ownership transfers to caller
-   Raises EngineError on failure
-   No partially initialized session returned
-
-5. SYNTHESIS
-   Client calls session.synthesize(request)
-   Returns SynthesizedAudio
-   Raises EngineError on failure (session remains usable)
-
-6. SESSION DISPOSAL
-   Client calls session.dispose()
-   Releases session resources
-
-7. DEACTIVATION
-   Client calls engine.dispose()
-   Caller must ensure all sessions are disposed first
-   Disposing engine while sessions are alive is undefined behavior
-   Releases engine resources
-```
-
-### 7.2 EngineSession Lifecycle
-
-```
-1. CREATION
-   Created by Engine.createSession()
-   Ownership transfers to caller
-   Raises EngineError on failure
-
-2. USAGE
-   Client calls synthesize() one or more times
-   Each call returns SynthesizedAudio or raises EngineError
-   Session remains usable after synthesize() failure
-   If CancelableSession: cancel() causes synthesize() to raise CancelledError
-   If StreamingSynthesizer: iterator raises CancelledError on cancel(), EngineError on failure
-
-3. DISPOSAL
-   Client calls dispose()
-   Releases session resources
-   After dispose(), all methods except dispose() raise EngineError
-```
-
-### 7.3 Ownership Rules
-
-- Engine.createSession() transfers ownership of the returned session to the caller
-- Caller is responsible for disposing all sessions before disposing the engine
-- Engine does not track sessions; it has no lifecycle registry
-- Disposing an engine while any session is still alive violates the API contract; behavior is undefined
-- This design avoids coupling, synchronization overhead, and lifecycle registry complexity
-
-### 7.4 Concurrent Operations
-
-**Engine.dispose() concurrent with Engine.createSession()**:
-- createSession() must either succeed with fully initialized EngineSession or raise EngineError
-- Partially initialized EngineSession must never be returned
-- After dispose() completes, subsequent createSession() calls must raise EngineError
-
-**EngineSession.dispose() concurrent with EngineSession.synthesize()**:
-- Not thread-safe. Caller must ensure synthesize() completes before dispose().
-
-**EngineSession.dispose() concurrent with StreamingSynthesizer.synthesizeStream()**:
-- Not thread-safe. Caller must ensure stream iteration completes before dispose().
-
----
-
-## 8. Thread Safety Contract
-
-| Component | Thread-safe | Notes |
-|-----------|-------------|-------|
-| Engine | Yes | createSession() can be called from any thread |
-| EngineSession | No | synthesize() must be called from one thread at a time |
-| HostContext | Yes | Provides shared services |
-| VoiceSelection | Yes | Immutable value object |
-| ParameterValues | Yes | Immutable value object |
-| AudioFormat | Yes | Immutable value object |
-| EngineConfig | Yes | Immutable value object |
-
----
-
-## 9. dispose() Contract
-
-**General rules**:
-- Calling dispose() multiple times is safe (no-op on second call)
-- dispose() never raises exceptions (catches and logs internally)
-- After dispose(), all methods except dispose() raise EngineError
-
-**Engine.dispose()**:
-- Caller must ensure all sessions are disposed first
-- Disposing engine while sessions are alive violates API contract; behavior is undefined
-- Releases engine resources
-
-**EngineSession.dispose()**:
-- Releases session resources
-
----
-
-## 10. Dependency Rules
-
-```
-Core Domain (Engine, EngineSession, Value Objects)
-  -> No dependencies
-
-Plugin Manifest (PluginManifest, ModelManifest, etc.)
-  -> No dependencies
-
-Host Context (HostContext)
-  -> Depends on: Core Domain (for types)
-
-Plugin Implementation
-  -> Depends on: Core Domain, Host Context
-
-Host
-  -> Depends on: Core Domain, Plugin Manifest
-```
-
-**Forbidden**:
-- Core Domain -> anything else
-- Plugin Manifest -> anything else
-- Plugin Implementation -> Host (only receives HostContext)
-- Host -> Plugin Implementation (only via create_engine function)
-
----
-
-## 11. Architectural Invariants
-
-1. Core Domain has zero dependencies
-2. Plugins receive HostContext at creation, not via global state
-3. Model requirements are static (plugin level), not dynamic (engine level)
-4. Host validates capability implementation at load time: each capability declared in PluginManifest.capabilities must be implemented by the exported object via the corresponding interface
-5. synthesize() raises typed exceptions, not returns Result
-6. dispose() is idempotent and never raises
-7. No global state, no service locator
-8. VoiceSelection and ParameterValues are opaque to engine
-9. Display information comes from VoiceManifest
-10. HostContext is minimal (3 fields max)
-11. EngineConfig contains only engine settings, not resource references
-12. EngineSession owns mutable execution state isolated from other concurrent work
-13. Engine.createSession() transfers ownership to caller
-14. Caller must dispose all sessions before disposing engine
-15. After dispose(), all methods except dispose() raise EngineError
-16. create_engine() is atomic (all-or-nothing)
-17. Garbage collection without dispose() may leak (documented)
-18. Capabilities are additive (new capabilities don't break old plugins)
-19. api_version enables compatibility checking
-20. createSession() returns fully initialized session or raises, never partial
-21. cancel() causes synthesize() to raise CancelledError
-22. EngineSession remains usable after cancellation
-23. Engine does not track sessions; no lifecycle registry
-
----
-
-## 12. Validation Examples
-
-### 12.1 Kokoro
-
-```python
-PLUGIN_MANIFEST = PluginManifest(
-  id="kokoro",
-  api_version="1.0",
-  capabilities=["voice_list", "preview", "voice_blend"],
-  engine=EngineManifest(
-    voiceSources=[
-      VoiceSourceManifest(id="builtin", type="list", config={"voices": [...]}),
-      VoiceSourceManifest(id="formula", type="blend", config={"syntax": "{a}*0.5+{b}*0.5"}),
-    ],
-    parameters=[ParameterManifest(id="speed", type="float", default=1.0, min=0.5, max=2.0)],
-    audioFormats=[AudioFormatManifest(mime="audio/wav", extension="wav")],
-  ),
-)
-
-MODEL_REQUIREMENTS = []
-
-def create_engine(context: HostContext, model_path: Path | None, config: EngineConfig) -> Engine:
-  model = load_kokoro(model_path)
-  return KokoroEngine(model, config.device)
-```
-
-### 12.2 SuperTonic
-
-```python
-PLUGIN_MANIFEST = PluginManifest(
-  id="supertonic",
-  api_version="1.0",
-  capabilities=["voice_list", "preview"],
-  engine=EngineManifest(
-    voiceSources=[VoiceSourceManifest(id="builtin", type="list", config={"voices": [...]})],
-    parameters=[
-      ParameterManifest(id="speed", type="float", default=1.0, min=0.5, max=2.0),
-      ParameterManifest(id="steps", type="int", default=20, min=5, max=50),
-    ],
-    audioFormats=[AudioFormatManifest(mime="audio/wav", extension="wav")],
-  ),
-)
-
-MODEL_REQUIREMENTS = []
-
-def create_engine(context: HostContext, model_path: Path | None, config: EngineConfig) -> Engine:
-  model = load_supertonic(model_path)
-  return SuperTonicEngine(model, config.device)
-```
-
-### 12.3 ElevenLabs
-
-```python
-PLUGIN_MANIFEST = PluginManifest(
-  id="elevenlabs",
-  api_version="1.0",
-  capabilities=["voice_list"],
-  requires=RequirementManifest(internet=True),
-  engine=EngineManifest(
-    voiceSources=[VoiceSourceManifest(id="cloud", type="list", config={"speakers": [...]})],
-    parameters=[ParameterManifest(id="stability", type="float", default=0.5, min=0.0, max=1.0)],
-    audioFormats=[AudioFormatManifest(mime="audio/mpeg", extension="mp3")],
-  ),
-)
-
-MODEL_REQUIREMENTS = []
-
-def create_engine(context: HostContext, model_path: Path | None, config: EngineConfig) -> Engine:
-  api_key = (context.config_dir / "elevenlabs_key").read_text()
-  return ElevenLabsEngine(api_key)
-```
-
-### 12.4 Piper
-
-```python
-PLUGIN_MANIFEST = PluginManifest(
-  id="piper",
-  api_version="1.0",
-  capabilities=[],
-  engine=EngineManifest(
-    voiceSources=[VoiceSourceManifest(id="downloadable", type="list", config={"models": [...]})],
-    parameters=[ParameterManifest(id="speed", type="float", default=1.0, min=0.5, max=2.0)],
-    audioFormats=[AudioFormatManifest(mime="audio/wav", extension="wav")],
-  ),
-)
-
-MODEL_REQUIREMENTS = [
-  ModelManifest(id="en_US-lessac-medium", name="English Lessac Medium", size="100MB"),
-]
-
-def create_engine(context: HostContext, model_path: Path | None, config: EngineConfig) -> Engine:
-  return PiperEngine(model_path, config.device)
-```
-
-### 12.5 XTTS (with streaming and cancellation)
-
-```python
-PLUGIN_MANIFEST = PluginManifest(
-  id="xtts",
-  api_version="1.0",
-  capabilities=["voice_list", "preview", "voice_clone", "streaming", "cancel"],
-  requires=RequirementManifest(gpu=GpuRequirement(required=True, type="cuda")),
-  engine=EngineManifest(
-    voiceSources=[
-      VoiceSourceManifest(id="speakers", type="speaker_id", config={"speakers": [...]}),
-      VoiceSourceManifest(id="clone", type="clone", config={"requiresAudio": True, "maxDuration": 30}),
-    ],
-    parameters=[ParameterManifest(id="temperature", type="float", default=0.7, min=0.1, max=1.0)],
-    audioFormats=[AudioFormatManifest(mime="audio/wav", extension="wav")],
-  ),
-)
-
-MODEL_REQUIREMENTS = [
-  ModelManifest(id="xtts_v2", name="XTTS v2", size="2GB"),
-]
-
-def create_engine(context: HostContext, model_path: Path | None, config: EngineConfig) -> Engine:
-  return XTTSEngine(model_path, config.device)
-```
-
-XTTS session implements: EngineSession, StreamingSynthesizer, CancelableSession.
-
----
-
-## 13. Summary of All Decisions
-
-| Aspect | Decision |
-|--------|----------|
-| Engine | Factory, stateless, thread-safe for createSession() |
-| EngineSession | Owns mutable execution state, not thread-safe |
-| EngineSession ownership | Caller owns (transferred from createSession) |
-| Engine session tracking | None; engine does not track sessions |
-| StreamingSynthesizer | Optional capability of EngineSession |
-| CancelableSession | Optional capability, cancel() raises CancelledError |
-| dispose() | Idempotent, never raises |
-| Engine.dispose() | Caller must dispose sessions first; undefined if violated |
-| createSession() | Raises EngineError on failure, no partial sessions |
-| create_engine() | Atomic, takes context, model_path, config |
-| EngineConfig | Engine settings only, no resource references |
-| model_path | Separate argument, not in EngineConfig |
-| MODEL_REQUIREMENTS | Static at plugin level |
-| HostContext | Minimal (3 fields) |
-| Error handling | Typed exceptions (EngineError hierarchy) |
-| Thread safety | Documented per component |
-| Capabilities | Additive, optional interfaces |
-| API versioning | api_version in manifest |
-| Concurrent dispose/createSession | Fully initialized session or EngineError |
-| Concurrent dispose/synthesizeStream | Not thread-safe; caller must complete iteration first |

plugins/kokoro/__init__.py

@@ -1,178 +0,0 @@
-"""Kokoro TTS Plugin for the TTS Plugin Architecture.
-
-This plugin provides a Kokoro-based TTS engine that implements the
-Plugin API contract. It wraps the existing Kokoro backend in the
-new Engine/EngineSession architecture.
-
-Exports:
-    - PLUGIN_MANIFEST: PluginManifest
-    - MODEL_REQUIREMENTS: list[ModelManifest]
-    - create_engine: Factory function
-"""
-
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-from abogen.tts_plugin.engine import Engine
-from abogen.tts_plugin.host_context import HostContext
-from abogen.tts_plugin.manifest import (
-    AudioFormatManifest,
-    EngineManifest,
-    ModelManifest,
-    ParameterManifest,
-    PluginManifest,
-    RequirementManifest,
-    VoiceManifest,
-    VoiceSourceManifest,
-)
-from abogen.tts_plugin.types import EngineConfig
-
-from .engine import KokoroEngine
-
-
-def _load_kpipeline() -> Any:
-    """Lazy-load Kokoro dependencies."""
-    from kokoro import KPipeline  # type: ignore[import-not-found]
-    return KPipeline
-
-
-PLUGIN_MANIFEST = PluginManifest(
-    id="kokoro",
-    name="Kokoro",
-    version="0.9.4",
-    api_version="1.0",
-    description="Kokoro TTS engine - high quality multilingual text-to-speech",
-    author="Kokoro Team",
-    capabilities=("voice_list",),
-    requires=RequirementManifest(
-        internet=False,
-    ),
-    engine=EngineManifest(
-        voiceSources=(
-            VoiceSourceManifest(
-                id="builtin",
-                name="Built-in Voices",
-                type="list",
-                config={"voices": "See listVoices()"},
-            ),
-        ),
-        parameters=(
-            ParameterManifest(
-                id="speed",
-                name="Speed",
-                description="Speech speed multiplier",
-                type="float",
-                default=1.0,
-                min=0.5,
-                max=2.0,
-                step=0.1,
-            ),
-        ),
-        audioFormats=(
-            AudioFormatManifest(mime="audio/wav", extension="wav"),
-        ),
-    ),
-    voices=(
-        VoiceManifest(id="af_alloy", name="Alloy", tags=("en", "female")),
-        VoiceManifest(id="af_aoede", name="Aoede", tags=("en", "female")),
-        VoiceManifest(id="af_bella", name="Bella", tags=("en", "female")),
-        VoiceManifest(id="af_heart", name="Heart", tags=("en", "female")),
-        VoiceManifest(id="af_jessica", name="Jessica", tags=("en", "female")),
-        VoiceManifest(id="af_kore", name="Kore", tags=("en", "female")),
-        VoiceManifest(id="af_nicole", name="Nicole", tags=("en", "female")),
-        VoiceManifest(id="af_nova", name="Nova", tags=("en", "female")),
-        VoiceManifest(id="af_river", name="River", tags=("en", "female")),
-        VoiceManifest(id="af_sarah", name="Sarah", tags=("en", "female")),
-        VoiceManifest(id="af_sky", name="Sky", tags=("en", "female")),
-        VoiceManifest(id="am_adam", name="Adam", tags=("en", "male")),
-        VoiceManifest(id="am_echo", name="Echo", tags=("en", "male")),
-        VoiceManifest(id="am_eric", name="Eric", tags=("en", "male")),
-        VoiceManifest(id="am_fenrir", name="Fenrir", tags=("en", "male")),
-        VoiceManifest(id="am_liam", name="Liam", tags=("en", "male")),
-        VoiceManifest(id="am_michael", name="Michael", tags=("en", "male")),
-        VoiceManifest(id="am_onyx", name="Onyx", tags=("en", "male")),
-        VoiceManifest(id="am_puck", name="Puck", tags=("en", "male")),
-        VoiceManifest(id="am_santa", name="Santa", tags=("en", "male")),
-        VoiceManifest(id="bf_alice", name="Alice", tags=("en", "female")),
-        VoiceManifest(id="bf_emma", name="Emma", tags=("en", "female")),
-        VoiceManifest(id="bf_isabella", name="Isabella", tags=("en", "female")),
-        VoiceManifest(id="bf_lily", name="Lily", tags=("en", "female")),
-        VoiceManifest(id="bm_daniel", name="Daniel", tags=("en", "male")),
-        VoiceManifest(id="bm_fable", name="Fable", tags=("en", "male")),
-        VoiceManifest(id="bm_george", name="George", tags=("en", "male")),
-        VoiceManifest(id="bm_lewis", name="Lewis", tags=("en", "male")),
-        VoiceManifest(id="ef_dora", name="Dora", tags=("es", "female")),
-        VoiceManifest(id="em_alex", name="Alex", tags=("es", "male")),
-        VoiceManifest(id="em_santa", name="Santa", tags=("es", "male")),
-        VoiceManifest(id="ff_siwis", name="Siwis", tags=("fr", "female")),
-        VoiceManifest(id="hf_alpha", name="Alpha", tags=("hi", "female")),
-        VoiceManifest(id="hf_beta", name="Beta", tags=("hi", "female")),
-        VoiceManifest(id="hm_omega", name="Omega", tags=("hi", "male")),
-        VoiceManifest(id="hm_psi", name="Psi", tags=("hi", "male")),
-        VoiceManifest(id="if_sara", name="Sara", tags=("it", "female")),
-        VoiceManifest(id="im_nicola", name="Nicola", tags=("it", "male")),
-        VoiceManifest(id="jf_alpha", name="Alpha", tags=("ja", "female")),
-        VoiceManifest(id="jf_gongitsune", name="Gongitsune", tags=("ja", "female")),
-        VoiceManifest(id="jf_nezumi", name="Nezumi", tags=("ja", "female")),
-        VoiceManifest(id="jf_tebukuro", name="Tebukuro", tags=("ja", "female")),
-        VoiceManifest(id="jm_kumo", name="Kumo", tags=("ja", "male")),
-        VoiceManifest(id="pf_dora", name="Dora", tags=("pt", "female")),
-        VoiceManifest(id="pm_alex", name="Alex", tags=("pt", "male")),
-        VoiceManifest(id="pm_santa", name="Santa", tags=("pt", "male")),
-        VoiceManifest(id="zf_xiaobei", name="Xiaobei", tags=("zh", "female")),
-        VoiceManifest(id="zf_xiaoni", name="Xiaoni", tags=("zh", "female")),
-        VoiceManifest(id="zf_xiaoxiao", name="Xiaoxiao", tags=("zh", "female")),
-        VoiceManifest(id="zf_xiaoyi", name="Xiaoyi", tags=("zh", "female")),
-        VoiceManifest(id="zm_yunjian", name="Yunjian", tags=("zh", "male")),
-        VoiceManifest(id="zm_yunxi", name="Yunxi", tags=("zh", "male")),
-        VoiceManifest(id="zm_yunxia", name="Yunxia", tags=("zh", "female")),
-        VoiceManifest(id="zm_yunyang", name="Yunyang", tags=("zh", "male")),
-    ),
-)
-
-MODEL_REQUIREMENTS: list[ModelManifest] = []
-
-
-def create_engine(
-    context: HostContext,
-    model_path: Path | None,
-    config: EngineConfig,
-) -> Engine:
-    """Create a Kokoro engine instance.
-
-    This function is the plugin entry point. It must be atomic:
-    succeed fully or raise EngineError and clean up.
-
-    Args:
-        context: Host services (config dir, logger, http client).
-        model_path: Resolved model path, or None for default.
-        config: Engine initialization settings (device, etc.).
-
-    Returns:
-        A fully initialized KokoroEngine instance.
-
-    Raises:
-        EngineError: On failure. Cleans up partially created resources.
-    """
-    try:
-        KPipeline = _load_kpipeline()
-
-        # Determine repo_id from model_path or use default
-        repo_id = "hexgrad/Kokoro-82M"
-        if model_path is not None:
-            # If a specific model path is provided, use it as repo_id
-            repo_id = str(model_path)
-
-        pipeline = KPipeline(
-            lang_code=config.lang_code,
-            repo_id=repo_id,
-            device=config.device,
-        )
-
-        engine = KokoroEngine(pipeline)
-        return engine
-    except Exception as e:
-        from abogen.tts_plugin.errors import EngineError as EngineErrorClass
-        raise EngineErrorClass(f"Failed to create Kokoro engine: {e}") from e

plugins/kokoro/engine.py

@@ -1,118 +0,0 @@
-"""Kokoro Engine adapter for the TTS Plugin Architecture.
-
-This module adapts the existing Kokoro backend to the new Engine/EngineSession
-protocol. It wraps the KokoroBackend without modifying it.
-"""
-
-from __future__ import annotations
-
-import logging
-from typing import Any
-
-import numpy as np
-
-from abogen.tts_plugin.capabilities import VoiceLister
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.errors import EngineError
-from abogen.tts_plugin.manifest import VoiceManifest
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    Duration,
-    SynthesisRequest,
-    SynthesizedAudio,
-)
-
-logger = logging.getLogger(__name__)
-
-# Sample rate for Kokoro audio
-_KOKORO_SAMPLE_RATE = 24000
-
-
-class KokoroSession:
-    """EngineSession implementation for Kokoro.
-
-    Owns mutable execution state for synthesis.
-    NOT thread-safe.
-    """
-
-    def __init__(self, pipeline: Any) -> None:
-        self._pipeline = pipeline
-        self._disposed = False
-
-    def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio:
-        """Synthesize audio from text using Kokoro."""
-        if self._disposed:
-            raise EngineError("Session disposed")
-
-        try:
-            voice = request.voice.key
-            speed = request.parameters.values.get("speed", 1.0)
-            split_pattern = request.parameters.values.get("split_pattern", None)
-
-            audio_parts: list[np.ndarray] = []
-            for segment in self._pipeline(
-                request.text,
-                voice=voice,
-                speed=speed,
-                split_pattern=split_pattern,
-            ):
-                audio = segment.audio
-                if hasattr(audio, "numpy"):
-                    audio = audio.numpy()
-                audio_parts.append(np.asarray(audio, dtype="float32"))
-
-            if not audio_parts:
-                return SynthesizedAudio(
-                    data=b"",
-                    format=AudioFormat(mime="audio/wav", extension="wav"),
-                    duration=Duration(seconds=0.0),
-                )
-
-            combined = np.concatenate(audio_parts).astype("float32", copy=False)
-            audio_bytes = combined.tobytes()
-            duration_seconds = len(combined) / _KOKORO_SAMPLE_RATE
-
-            return SynthesizedAudio(
-                data=audio_bytes,
-                format=AudioFormat(mime="audio/wav", extension="wav"),
-                duration=Duration(seconds=duration_seconds),
-            )
-        except EngineError:
-            raise
-        except Exception as e:
-            raise EngineError(f"Synthesis failed: {e}") from e
-
-    def dispose(self) -> None:
-        """Release session resources. Idempotent."""
-        self._disposed = True
-
-
-class KokoroEngine:
-    """Engine implementation for Kokoro.
-
-    Factory for KokoroSession instances. Stateless and thread-safe.
-    """
-
-    def __init__(self, pipeline: Any) -> None:
-        self._pipeline = pipeline
-        self._disposed = False
-
-    def createSession(self) -> KokoroSession:
-        """Create a new KokoroSession."""
-        if self._disposed:
-            raise EngineError("Engine disposed")
-        return KokoroSession(self._pipeline)
-
-    def dispose(self) -> None:
-        """Release engine resources. Idempotent."""
-        self._disposed = True
-
-    def listVoices(self, sourceId: str) -> list[VoiceManifest]:
-        """List available Kokoro voices. Implements VoiceLister capability.
-
-        Note: Static voices are declared in the plugin manifest.
-        This method is a fallback for dynamic plugins.
-        """
-        if self._disposed:
-            raise EngineError("Engine disposed")
-        return []

plugins/supertonic/__init__.py

@@ -1,136 +0,0 @@
-"""SuperTonic TTS Plugin for the TTS Plugin Architecture.
-
-This plugin provides a SuperTonic-based TTS engine that implements the
-Plugin API contract. It wraps the existing SuperTonic backend in the
-new Engine/EngineSession architecture.
-
-Exports:
-    - PLUGIN_MANIFEST: PluginManifest
-    - MODEL_REQUIREMENTS: list[ModelManifest]
-    - create_engine: Factory function
-"""
-
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-from abogen.tts_plugin.engine import Engine
-from abogen.tts_plugin.host_context import HostContext
-from abogen.tts_plugin.manifest import (
-    AudioFormatManifest,
-    EngineManifest,
-    ModelManifest,
-    ParameterManifest,
-    PluginManifest,
-    RequirementManifest,
-    VoiceManifest,
-    VoiceSourceManifest,
-)
-from abogen.tts_plugin.types import EngineConfig
-
-from .engine import SuperTonicEngine
-
-
-def _load_supertonic_pipeline() -> Any:
-    """Lazy-load SuperTonic dependencies and create pipeline."""
-    from plugins.supertonic.pipeline import SupertonicPipeline
-
-    return SupertonicPipeline(
-        sample_rate=24000,
-        auto_download=True,
-        total_steps=5,
-    )
-
-
-PLUGIN_MANIFEST = PluginManifest(
-    id="supertonic",
-    name="SuperTonic",
-    version="0.1.0",
-    api_version="1.0",
-    description="SuperTonic TTS engine - fast high-quality text-to-speech",
-    author="SuperTonic Team",
-    capabilities=("voice_list",),
-    requires=RequirementManifest(
-        internet=False,
-    ),
-    engine=EngineManifest(
-        voiceSources=(
-            VoiceSourceManifest(
-                id="builtin",
-                name="Built-in Voices",
-                type="list",
-                config={"voices": "See listVoices()"},
-            ),
-        ),
-        parameters=(
-            ParameterManifest(
-                id="speed",
-                name="Speed",
-                description="Speech speed multiplier",
-                type="float",
-                default=1.0,
-                min=0.7,
-                max=2.0,
-                step=0.1,
-            ),
-            ParameterManifest(
-                id="total_steps",
-                name="Quality Steps",
-                description="Inference steps (higher = better quality, slower)",
-                type="int",
-                default=5,
-                min=2,
-                max=15,
-                step=1,
-            ),
-        ),
-        audioFormats=(
-            AudioFormatManifest(mime="audio/wav", extension="wav"),
-        ),
-    ),
-    voices=(
-        VoiceManifest(id="M1", name="Male 1", tags=("male",)),
-        VoiceManifest(id="M2", name="Male 2", tags=("male",)),
-        VoiceManifest(id="M3", name="Male 3", tags=("male",)),
-        VoiceManifest(id="M4", name="Male 4", tags=("male",)),
-        VoiceManifest(id="M5", name="Male 5", tags=("male",)),
-        VoiceManifest(id="F1", name="Female 1", tags=("female",)),
-        VoiceManifest(id="F2", name="Female 2", tags=("female",)),
-        VoiceManifest(id="F3", name="Female 3", tags=("female",)),
-        VoiceManifest(id="F4", name="Female 4", tags=("female",)),
-        VoiceManifest(id="F5", name="Female 5", tags=("female",)),
-    ),
-)
-
-MODEL_REQUIREMENTS: list[ModelManifest] = []
-
-
-def create_engine(
-    context: HostContext,
-    model_path: Path | None,
-    config: EngineConfig,
-) -> Engine:
-    """Create a SuperTonic engine instance.
-
-    This function is the plugin entry point. It must be atomic:
-    succeed fully or raise EngineError and clean up.
-
-    Args:
-        context: Host services (config dir, logger, http client).
-        model_path: Resolved model path, or None for default.
-        config: Engine initialization settings (device, etc.).
-
-    Returns:
-        A fully initialized SuperTonicEngine instance.
-
-    Raises:
-        EngineError: On failure. Cleans up partially created resources.
-    """
-    try:
-        pipeline = _load_supertonic_pipeline()
-        engine = SuperTonicEngine(pipeline)
-        return engine
-    except Exception as e:
-        from abogen.tts_plugin.errors import EngineError as EngineErrorClass
-        raise EngineErrorClass(f"Failed to create SuperTonic engine: {e}") from e

plugins/supertonic/engine.py

@@ -1,125 +0,0 @@
-"""SuperTonic Engine adapter for the TTS Plugin Architecture.
-
-This module adapts the existing SuperTonic backend to the new Engine/EngineSession
-protocol. It wraps the SupertonicPipeline without modifying it.
-"""
-
-from __future__ import annotations
-
-import io
-import logging
-from typing import Any
-
-import numpy as np
-
-from abogen.tts_plugin.capabilities import VoiceLister
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.errors import EngineError
-from abogen.tts_plugin.manifest import VoiceManifest
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    Duration,
-    SynthesisRequest,
-    SynthesizedAudio,
-)
-
-logger = logging.getLogger(__name__)
-
-# Sample rate for SuperTonic audio
-_SUPERTONIC_SAMPLE_RATE = 24000
-
-
-class SuperTonicSession:
-    """EngineSession implementation for SuperTonic.
-
-    Owns mutable execution state for synthesis.
-    NOT thread-safe.
-    """
-
-    def __init__(self, pipeline: Any) -> None:
-        self._pipeline = pipeline
-        self._disposed = False
-
-    def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio:
-        """Synthesize audio from text using SuperTonic."""
-        if self._disposed:
-            raise EngineError("Session disposed")
-
-        try:
-            import soundfile as sf
-
-            voice = request.voice.key
-            speed = float(request.parameters.values.get("speed", 1.0))
-            total_steps = request.parameters.values.get("total_steps", None)
-            split_pattern = request.parameters.values.get("split_pattern", None)
-
-            if total_steps is not None:
-                total_steps = int(total_steps)
-
-            audio_parts: list[np.ndarray] = []
-            for segment in self._pipeline(
-                request.text,
-                voice=voice,
-                speed=speed,
-                split_pattern=split_pattern,
-                total_steps=total_steps,
-            ):
-                audio_parts.append(segment.audio)
-
-            if not audio_parts:
-                return SynthesizedAudio(
-                    data=b"",
-                    format=AudioFormat(mime="audio/wav", extension="wav"),
-                    duration=Duration(seconds=0.0),
-                )
-
-            combined = np.concatenate(audio_parts).astype("float32", copy=False)
-            buf = io.BytesIO()
-            sf.write(buf, combined, self._pipeline.sample_rate, format="WAV")
-            audio_bytes = buf.getvalue()
-            duration_seconds = len(combined) / self._pipeline.sample_rate
-
-            return SynthesizedAudio(
-                data=audio_bytes,
-                format=AudioFormat(mime="audio/wav", extension="wav"),
-                duration=Duration(seconds=duration_seconds),
-            )
-        except EngineError:
-            raise
-        except Exception as e:
-            raise EngineError(f"Synthesis failed: {e}") from e
-
-    def dispose(self) -> None:
-        """Release session resources. Idempotent."""
-        self._disposed = True
-
-
-class SuperTonicEngine:
-    """Engine implementation for SuperTonic.
-
-    Factory for SuperTonicSession instances. Stateless and thread-safe.
-    """
-
-    def __init__(self, pipeline: Any) -> None:
-        self._pipeline = pipeline
-        self._disposed = False
-
-    def createSession(self) -> SuperTonicSession:
-        """Create a new SuperTonicSession."""
-        if self._disposed:
-            raise EngineError("Engine disposed")
-        return SuperTonicSession(self._pipeline)
-
-    def dispose(self) -> None:
-        """Release engine resources. Idempotent."""
-        self._disposed = True
-
-    def listVoices(self, sourceId: str) -> list[VoiceManifest]:
-        """List available SuperTonic voices. Implements VoiceLister capability.
-        
-        Note: Static voice catalog is declared in plugin manifest.
-        This method is retained for VoiceLister interface compliance.
-        """
-        if self._disposed:
-            raise EngineError("Engine disposed")
-        return []

pyproject.toml

@@ -50,6 +50,8 @@ dependencies = [
   "num2words>=0.5.13",
   "httpx>=0.27.0",
   "PyQt6>=6.5.0",
+  "flet>=0.85.1",
+  "msgpack>=1.0.0",
 ]
 
 classifiers = [
@@ -77,11 +79,12 @@ allow-direct-references = true
 
 
 [project.gui-scripts]
-abogen = "abogen.pyqt.main:main"
+abogen = "abogen.frontend.main:main"
 
 [project.scripts]
+abogen-ui = "abogen.frontend.main:main"
+abogen-web = "abogen.frontend.main:main_web"
 abogen-cli = "abogen.webui.app:main"
-abogen-web = "abogen.webui.app:main"
 abogen-pyqt = "abogen.pyqt.main:main"
 
 [tool.hatch.build.targets.sdist]

tests/contracts/__init__.py

@@ -1,5 +0,0 @@
-"""Contract tests for the TTS Plugin API.
-
-This package contains reusable contract tests that any TTS plugin implementation
-must satisfy. Tests use only the public API and are engine-agnostic.
-"""

tests/contracts/conftest.py

@@ -1,231 +0,0 @@
-"""Shared fixtures and stubs for contract tests.
-
-This module provides minimal stub implementations that satisfy the public API
-for testing purposes. These stubs do NOT contain real business logic.
-"""
-
-from __future__ import annotations
-
-import logging
-from pathlib import Path
-from typing import Iterator
-
-import pytest
-
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.host_context import HostContext
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    Duration,
-    EngineConfig,
-    ParameterValues,
-    SynthesisRequest,
-    SynthesizedAudio,
-    VoiceSelection,
-)
-
-
-class FakeHttpClient:
-    """Stub HTTP client that satisfies the HttpClient protocol."""
-
-    def get(self, url: str, **kwargs: object) -> object:
-        return None
-
-    def post(self, url: str, **kwargs: object) -> object:
-        return None
-
-
-class FakeEngineSession:
-    """Stub EngineSession for testing protocol compliance."""
-
-    def __init__(self) -> None:
-        self._disposed = False
-
-    def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio:
-        if self._disposed:
-            from abogen.tts_plugin.errors import EngineError
-
-            raise EngineError("Session disposed")
-        return SynthesizedAudio(
-            data=b"\x00" * 100,
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-            duration=Duration(seconds=1.0),
-        )
-
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-class FakeStreamingSession:
-    """Stub EngineSession with StreamingSynthesizer capability."""
-
-    def __init__(self) -> None:
-        self._disposed = False
-
-    def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio:
-        if self._disposed:
-            from abogen.tts_plugin.errors import EngineError
-
-            raise EngineError("Session disposed")
-        return SynthesizedAudio(
-            data=b"\x00" * 100,
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-            duration=Duration(seconds=1.0),
-        )
-
-    def synthesizeStream(self, request: SynthesisRequest) -> Iterator[bytes]:
-        if self._disposed:
-            from abogen.tts_plugin.errors import EngineError
-
-            raise EngineError("Session disposed")
-        for i in range(3):
-            yield b"\x00" * 50
-
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-class FakeCancelableSession:
-    """Stub EngineSession with CancelableSession capability."""
-
-    def __init__(self) -> None:
-        self._disposed = False
-        self._cancelled = False
-
-    def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio:
-        if self._disposed:
-            from abogen.tts_plugin.errors import EngineError
-
-            raise EngineError("Session disposed")
-        if self._cancelled:
-            from abogen.tts_plugin.errors import CancelledError
-
-            raise CancelledError("Cancelled")
-        return SynthesizedAudio(
-            data=b"\x00" * 100,
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-            duration=Duration(seconds=1.0),
-        )
-
-    def cancel(self) -> None:
-        if self._disposed:
-            from abogen.tts_plugin.errors import EngineError
-
-            raise EngineError("Session disposed")
-        self._cancelled = True
-
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-class FakeEngine:
-    """Stub Engine for testing protocol compliance."""
-
-    def __init__(self, session_class: type = FakeEngineSession) -> None:
-        self._disposed = False
-        self._session_class = session_class
-
-    def createSession(self) -> EngineSession:
-        if self._disposed:
-            from abogen.tts_plugin.errors import EngineError
-
-            raise EngineError("Engine disposed")
-        return self._session_class()
-
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-class FakeVoiceListerEngine:
-    """Stub Engine that also implements VoiceLister."""
-
-    def __init__(self) -> None:
-        self._disposed = False
-
-    def createSession(self) -> EngineSession:
-        if self._disposed:
-            from abogen.tts_plugin.errors import EngineError
-
-            raise EngineError("Engine disposed")
-        return FakeEngineSession()
-
-    def listVoices(self, sourceId: str) -> list:
-        from abogen.tts_plugin.manifest import VoiceManifest
-
-        return [
-            VoiceManifest(id="voice1", name="Voice 1", tags=("en",)),
-            VoiceManifest(id="voice2", name="Voice 2", tags=("es",)),
-        ]
-
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-class FakePreviewEngine:
-    """Stub Engine that also implements PreviewGenerator."""
-
-    def __init__(self) -> None:
-        self._disposed = False
-
-    def createSession(self) -> EngineSession:
-        if self._disposed:
-            from abogen.tts_plugin.errors import EngineError
-
-            raise EngineError("Engine disposed")
-        return FakeEngineSession()
-
-    def generatePreview(self, voice: VoiceSelection, text: str) -> SynthesizedAudio:
-        return SynthesizedAudio(
-            data=b"\x00" * 50,
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-            duration=Duration(seconds=0.5),
-        )
-
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-@pytest.fixture
-def fake_http_client() -> FakeHttpClient:
-    return FakeHttpClient()
-
-
-@pytest.fixture
-def host_context(tmp_path: Path, fake_http_client: FakeHttpClient) -> HostContext:
-    return HostContext(
-        config_dir=tmp_path,
-        logger=logging.getLogger("test"),
-        http_client=fake_http_client,
-    )
-
-
-@pytest.fixture
-def fake_engine() -> FakeEngine:
-    return FakeEngine()
-
-
-@pytest.fixture
-def fake_session() -> FakeEngineSession:
-    return FakeEngineSession()
-
-
-@pytest.fixture
-def default_voice() -> VoiceSelection:
-    return VoiceSelection(source="builtin", key="af_nova")
-
-
-@pytest.fixture
-def default_format() -> AudioFormat:
-    return AudioFormat(mime="audio/wav", extension="wav")
-
-
-@pytest.fixture
-def default_request(
-    default_voice: VoiceSelection, default_format: AudioFormat
-) -> SynthesisRequest:
-    return SynthesisRequest(
-        text="Hello, world!",
-        voice=default_voice,
-        parameters=ParameterValues(values={}),
-        format=default_format,
-    )

tests/contracts/engine_contract.py

@@ -1,120 +0,0 @@
-"""Base contract tests for Engine implementations.
-
-Any new TTS plugin must inherit from these classes to verify
-it satisfies the Engine/EngineSession protocol.
-
-Usage:
-    from tests.contracts.engine_contract import EngineContractMixin
-
-    class TestMyEngine(EngineContractMixin):
-        @pytest.fixture
-        def engine(self):
-            return create_my_engine()
-"""
-
-from __future__ import annotations
-
-import pytest
-
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.errors import EngineError
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    ParameterValues,
-    SynthesisRequest,
-    SynthesizedAudio,
-    VoiceSelection,
-)
-
-
-class EngineContractMixin:
-    """Base contract tests for Engine implementations.
-
-    Subclasses must define a module-level ``engine`` fixture returning
-    a fully initialized Engine instance. The tests below will use it
-    via pytest's standard fixture resolution.
-    """
-
-    def _req(self, text: str = "Hello", voice: str | None = None) -> SynthesisRequest:
-        return SynthesisRequest(
-            text=text,
-            voice=VoiceSelection(source="builtin", key=voice or "default"),
-            parameters=ParameterValues(values={}),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-
-    # ── Engine protocol ──────────────────────────────────────
-
-    def test_engine_satisfies_protocol(self, engine: Engine) -> None:
-        assert isinstance(engine, Engine)
-
-    def test_create_session_returns_session(self, engine: Engine) -> None:
-        session = engine.createSession()
-        assert isinstance(session, EngineSession)
-        session.dispose()
-
-    def test_create_session_returns_new_instances(self, engine: Engine) -> None:
-        s1 = engine.createSession()
-        s2 = engine.createSession()
-        assert s1 is not s2
-        s1.dispose()
-        s2.dispose()
-
-    def test_dispose_is_idempotent(self, engine: Engine) -> None:
-        engine.dispose()
-        engine.dispose()
-
-    def test_create_session_after_dispose_raises(self, engine: Engine) -> None:
-        engine.dispose()
-        with pytest.raises(EngineError):
-            engine.createSession()
-
-    # ── Session protocol ─────────────────────────────────────
-
-    def test_session_satisfies_protocol(self, engine: Engine) -> None:
-        session = engine.createSession()
-        assert isinstance(session, EngineSession)
-        session.dispose()
-        engine.dispose()
-
-    def test_session_synthesize_returns_audio(self, engine: Engine) -> None:
-        session = engine.createSession()
-        result = session.synthesize(self._req())
-        assert isinstance(result, SynthesizedAudio)
-        assert isinstance(result.data, bytes)
-        assert len(result.data) > 0
-        session.dispose()
-        engine.dispose()
-
-    def test_session_dispose_is_idempotent(self, engine: Engine) -> None:
-        session = engine.createSession()
-        session.dispose()
-        session.dispose()
-        engine.dispose()
-
-    def test_session_synthesize_after_dispose_raises(self, engine: Engine) -> None:
-        session = engine.createSession()
-        session.dispose()
-        with pytest.raises(EngineError):
-            session.synthesize(self._req())
-        engine.dispose()
-
-    def test_session_multiple_synthesize(self, engine: Engine) -> None:
-        session = engine.createSession()
-        r1 = session.synthesize(self._req())
-        r2 = session.synthesize(self._req())
-        assert isinstance(r1.data, bytes)
-        assert isinstance(r2.data, bytes)
-        session.dispose()
-        engine.dispose()
-
-    # ── Lifecycle ────────────────────────────────────────────
-
-    def test_full_lifecycle(self, engine: Engine) -> None:
-        s1 = engine.createSession()
-        s2 = engine.createSession()
-        s1.synthesize(self._req())
-        s2.synthesize(self._req())
-        s1.dispose()
-        s2.dispose()
-        engine.dispose()

tests/contracts/test_capabilities_contract.py

@@ -1,183 +0,0 @@
-"""Contract tests for capability interfaces.
-
-These tests verify that capability interfaces satisfy the architectural requirements:
-- VoiceLister: lists voices for a source
-- PreviewGenerator: generates preview audio
-- StreamingSynthesizer: yields audio chunks
-- CancelableSession: cancels in-progress synthesis
-"""
-
-import pytest
-
-from abogen.tts_plugin.capabilities import (
-    CancelableSession,
-    PreviewGenerator,
-    StreamingSynthesizer,
-    VoiceLister,
-)
-from abogen.tts_plugin.errors import CancelledError, EngineError
-from abogen.tts_plugin.manifest import VoiceManifest
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    Duration,
-    ParameterValues,
-    SynthesisRequest,
-    SynthesizedAudio,
-    VoiceSelection,
-)
-
-from .conftest import FakeCancelableSession, FakeStreamingSession, FakeVoiceListerEngine
-
-
-class TestVoiceListerProtocolContract:
-    """Contract tests for VoiceLister protocol."""
-
-    def test_voice_lister_is_protocol(self) -> None:
-        assert hasattr(VoiceLister, "__protocol_attrs__")
-
-    def test_voice_lister_satisfied_by_engine(self) -> None:
-        engine = FakeVoiceListerEngine()
-        assert isinstance(engine, VoiceLister)
-
-    def test_list_voices_returns_list(self) -> None:
-        engine = FakeVoiceListerEngine()
-        voices = engine.listVoices("builtin")
-        assert isinstance(voices, list)
-
-    def test_list_voices_returns_voice_manifests(self) -> None:
-        engine = FakeVoiceListerEngine()
-        voices = engine.listVoices("builtin")
-        for voice in voices:
-            assert isinstance(voice, VoiceManifest)
-
-    def test_list_voices_has_required_fields(self) -> None:
-        engine = FakeVoiceListerEngine()
-        voices = engine.listVoices("builtin")
-        for voice in voices:
-            assert hasattr(voice, "id")
-            assert hasattr(voice, "name")
-            assert hasattr(voice, "tags")
-
-
-class TestPreviewGeneratorProtocolContract:
-    """Contract tests for PreviewGenerator protocol."""
-
-    def test_preview_generator_is_protocol(self) -> None:
-        assert hasattr(PreviewGenerator, "__protocol_attrs__")
-
-    def test_preview_generator_satisfied_by_engine(self) -> None:
-        from .conftest import FakePreviewEngine
-
-        engine = FakePreviewEngine()
-        assert isinstance(engine, PreviewGenerator)
-
-    def test_generate_preview_returns_synthesized_audio(self) -> None:
-        from .conftest import FakePreviewEngine
-
-        engine = FakePreviewEngine()
-        voice = VoiceSelection(source="builtin", key="af_nova")
-        result = engine.generatePreview(voice, "Hello")
-        assert isinstance(result, SynthesizedAudio)
-
-    def test_generate_preview_has_valid_data(self) -> None:
-        from .conftest import FakePreviewEngine
-
-        engine = FakePreviewEngine()
-        voice = VoiceSelection(source="builtin", key="af_nova")
-        result = engine.generatePreview(voice, "Hello")
-        assert isinstance(result.data, bytes)
-        assert len(result.data) > 0
-
-
-class TestStreamingSynthesizerProtocolContract:
-    """Contract tests for StreamingSynthesizer protocol."""
-
-    def test_streaming_synthesizer_is_protocol(self) -> None:
-        assert hasattr(StreamingSynthesizer, "__protocol_attrs__")
-
-    def test_streaming_session_satisfies_protocol(self) -> None:
-        session = FakeStreamingSession()
-        assert isinstance(session, StreamingSynthesizer)
-
-    def test_synthesize_stream_yields_bytes(self) -> None:
-        session = FakeStreamingSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        chunks = list(session.synthesizeStream(request))
-        assert len(chunks) > 0
-        for chunk in chunks:
-            assert isinstance(chunk, bytes)
-
-    def test_streaming_iterator_exhaustion(self) -> None:
-        """Architecture spec: Iterator exhaustion = synthesis complete."""
-        session = FakeStreamingSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        chunks = list(session.synthesizeStream(request))
-        assert len(chunks) == 3
-
-    def test_streaming_after_dispose_raises(self) -> None:
-        """Architecture spec: After dispose(), methods raise EngineError."""
-        session = FakeStreamingSession()
-        session.dispose()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        with pytest.raises(EngineError):
-            list(session.synthesizeStream(request))
-
-
-class TestCancelableSessionProtocolContract:
-    """Contract tests for CancelableSession protocol."""
-
-    def test_cancelable_session_is_protocol(self) -> None:
-        assert hasattr(CancelableSession, "__protocol_attrs__")
-
-    def test_cancelable_session_satisfies_protocol(self) -> None:
-        session = FakeCancelableSession()
-        assert isinstance(session, CancelableSession)
-
-    def test_cancel_causes_synthesize_to_raise_cancelled(self) -> None:
-        """Architecture spec: cancel() causes synthesize() to raise CancelledError."""
-        session = FakeCancelableSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-
-        # Cancel
-        session.cancel()
-
-        # synthesize should raise CancelledError
-        with pytest.raises(CancelledError):
-            session.synthesize(request)
-
-    def test_cancel_after_dispose_raises(self) -> None:
-        """Architecture spec: cancel() raises EngineError if called after dispose()."""
-        session = FakeCancelableSession()
-        session.dispose()
-        with pytest.raises(EngineError):
-            session.cancel()
-
-    def test_session_usable_after_cancel(self) -> None:
-        """Architecture spec: EngineSession remains usable after cancellation."""
-        session = FakeCancelableSession()
-
-        # Cancel
-        session.cancel()
-
-        # Dispose and create new session for synthesis
-        session.dispose()

tests/contracts/test_engine_contract.py

@@ -1,106 +0,0 @@
-"""Contract tests for Engine protocol.
-
-These tests verify that Engine implementations satisfy the architectural requirements:
-- createSession() returns EngineSession
-- dispose() is idempotent
-- After dispose(), createSession() raises EngineError
-- Engine is thread-safe for createSession()
-"""
-
-import pytest
-
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.errors import EngineError
-
-from .conftest import FakeEngine, FakeEngineSession
-
-
-class TestEngineProtocolContract:
-    """Contract tests for the Engine protocol itself."""
-
-    def test_engine_is_protocol(self) -> None:
-        assert hasattr(Engine, "__protocol_attrs__")
-
-    def test_engine_session_is_protocol(self) -> None:
-        assert hasattr(EngineSession, "__protocol_attrs__")
-
-    def test_fake_engine_satisfies_protocol(self) -> None:
-        engine = FakeEngine()
-        assert isinstance(engine, Engine)
-
-    def test_fake_session_satisfies_protocol(self) -> None:
-        session = FakeEngineSession()
-        assert isinstance(session, EngineSession)
-
-
-class TestEngineCreateSessionContract:
-    """Contract tests for Engine.createSession()."""
-
-    def test_create_session_returns_engine_session(self) -> None:
-        engine = FakeEngine()
-        session = engine.createSession()
-        assert isinstance(session, EngineSession)
-
-    def test_create_session_returns_new_instance(self) -> None:
-        engine = FakeEngine()
-        session1 = engine.createSession()
-        session2 = engine.createSession()
-        assert session1 is not session2
-
-    def test_create_session_ownership_transfers(self) -> None:
-        """Architecture spec: Ownership transfers to caller."""
-        engine = FakeEngine()
-        session = engine.createSession()
-        assert isinstance(session, EngineSession)
-
-
-class TestEngineDisposeContract:
-    """Contract tests for Engine.dispose()."""
-
-    def test_dispose_is_idempotent(self) -> None:
-        """Architecture spec: dispose() is idempotent."""
-        engine = FakeEngine()
-        engine.dispose()
-        engine.dispose()  # Should not raise
-
-    def test_dispose_never_raises(self) -> None:
-        """Architecture spec: dispose() never raises exceptions."""
-        engine = FakeEngine()
-        engine.dispose()  # Should not raise
-
-    def test_create_session_after_dispose_raises(self) -> None:
-        """Architecture spec: After dispose(), all methods except dispose() raise EngineError."""
-        engine = FakeEngine()
-        engine.dispose()
-        with pytest.raises(EngineError):
-            engine.createSession()
-
-
-class TestEngineLifecycleContract:
-    """Contract tests for Engine lifecycle."""
-
-    def test_full_lifecycle(self) -> None:
-        """Test complete engine lifecycle: create -> sessions -> dispose."""
-        engine = FakeEngine()
-
-        # Create sessions
-        session1 = engine.createSession()
-        session2 = engine.createSession()
-
-        # Use sessions
-        assert isinstance(session1, EngineSession)
-        assert isinstance(session2, EngineSession)
-
-        # Dispose sessions
-        session1.dispose()
-        session2.dispose()
-
-        # Dispose engine
-        engine.dispose()
-
-    def test_engine_disposed_session_raises(self) -> None:
-        """Architecture spec: After dispose(), all methods except dispose() raise EngineError."""
-        engine = FakeEngine()
-        engine.dispose()
-        with pytest.raises(EngineError):
-            engine.createSession()

tests/contracts/test_errors_contract.py

@@ -1,85 +0,0 @@
-"""Contract tests for error hierarchy.
-
-These tests verify that the error hierarchy satisfies the architectural requirements:
-- All errors inherit from EngineError
-- EngineError inherits from Exception
-- Each error type is properly classified
-"""
-
-import pytest
-
-from abogen.tts_plugin.errors import (
-    CancelledError,
-    ConfigurationError,
-    EngineError,
-    InternalError,
-    InvalidInputError,
-    ModelLoadError,
-    ModelNotFoundError,
-    NetworkError,
-)
-
-
-class TestErrorHierarchyContract:
-    """Contract tests for the error hierarchy."""
-
-    def test_engine_error_is_exception(self) -> None:
-        assert issubclass(EngineError, Exception)
-
-    def test_all_errors_inherit_from_engine_error(self) -> None:
-        error_classes = [
-            ModelNotFoundError,
-            ModelLoadError,
-            NetworkError,
-            InvalidInputError,
-            ConfigurationError,
-            CancelledError,
-            InternalError,
-        ]
-        for error_class in error_classes:
-            assert issubclass(error_class, EngineError), (
-                f"{error_class.__name__} must inherit from EngineError"
-            )
-
-    def test_all_errors_are_catchable(self) -> None:
-        error_classes = [
-            EngineError,
-            ModelNotFoundError,
-            ModelLoadError,
-            NetworkError,
-            InvalidInputError,
-            ConfigurationError,
-            CancelledError,
-            InternalError,
-        ]
-        for error_class in error_classes:
-            with pytest.raises(EngineError):
-                raise error_class("test message")
-
-    def test_error_message_preserved(self) -> None:
-        msg = "Model not found: bert-base"
-        with pytest.raises(ModelNotFoundError, match=msg):
-            raise ModelNotFoundError(msg)
-
-    def test_error_can_be_caught_as_engine_error(self) -> None:
-        with pytest.raises(EngineError):
-            raise ModelNotFoundError("test")
-
-    def test_cancelled_error_is_engine_error(self) -> None:
-        """CancelledError is a subtype of EngineError per architecture spec."""
-        assert issubclass(CancelledError, EngineError)
-
-    def test_error_hierarchy_no_cycles(self) -> None:
-        """Verify no circular inheritance."""
-        error_classes = [
-            EngineError,
-            ModelNotFoundError,
-            ModelLoadError,
-            NetworkError,
-            InvalidInputError,
-            ConfigurationError,
-            CancelledError,
-            InternalError,
-        ]
-        for cls in error_classes:
-            assert cls not in cls.__bases__

tests/contracts/test_host_context_contract.py

@@ -1,89 +0,0 @@
-"""Contract tests for HostContext.
-
-These tests verify that HostContext satisfies the architectural requirements:
-- Minimal (3 fields maximum)
-- Frozen dataclass
-- config_dir: Path
-- logger: Logger
-- http_client: HttpClient protocol
-"""
-
-import logging
-from pathlib import Path
-
-import pytest
-
-from abogen.tts_plugin.host_context import HttpClient, HostContext
-
-
-class TestHostContextContract:
-    """Contract tests for HostContext dataclass."""
-
-    def test_is_frozen_dataclass(self) -> None:
-        assert hasattr(HostContext, "__dataclass_params__")
-        assert HostContext.__dataclass_params__.frozen is True
-
-    def test_required_fields(self, tmp_path: Path) -> None:
-        logger = logging.getLogger("test")
-
-        class FakeClient:
-            def get(self, url: str, **kwargs: object) -> object:
-                return None
-
-            def post(self, url: str, **kwargs: object) -> object:
-                return None
-
-        ctx = HostContext(
-            config_dir=tmp_path,
-            logger=logger,
-            http_client=FakeClient(),
-        )
-        assert ctx.config_dir == tmp_path
-        assert ctx.logger is logger
-
-    def test_immutability(self, tmp_path: Path) -> None:
-        class FakeClient:
-            def get(self, url: str, **kwargs: object) -> object:
-                return None
-
-            def post(self, url: str, **kwargs: object) -> object:
-                return None
-
-        ctx = HostContext(
-            config_dir=tmp_path,
-            logger=logging.getLogger("test"),
-            http_client=FakeClient(),
-        )
-        with pytest.raises(AttributeError):
-            ctx.config_dir = Path("/other")  # type: ignore[misc]
-
-    def test_max_three_fields(self) -> None:
-        """Architecture spec: HostContext is minimal (3 fields max)."""
-        import dataclasses
-
-        fields = dataclasses.fields(HostContext)
-        assert len(fields) <= 3
-
-
-class TestHttpClientProtocolContract:
-    """Contract tests for HttpClient protocol."""
-
-    def test_http_client_is_protocol(self) -> None:
-        assert hasattr(HttpClient, "__protocol_attrs__")
-
-    def test_http_client_has_get(self) -> None:
-        assert hasattr(HttpClient, "get")
-
-    def test_http_client_has_post(self) -> None:
-        assert hasattr(HttpClient, "post")
-
-    def test_http_client_satisfied(self) -> None:
-        class FakeClient:
-            def get(self, url: str, **kwargs: object) -> object:
-                return None
-
-            def post(self, url: str, **kwargs: object) -> object:
-                return None
-
-        client = FakeClient()
-        assert isinstance(client, HttpClient)

tests/contracts/test_integration.py

@@ -1,420 +0,0 @@
-"""Integration tests for the TTS Plugin Architecture.
-
-These tests verify:
-1. Consumer Flow: consumer → plugin → engine → session → synthesis → result
-2. Lifecycle: dispose, no leaks, error handling
-3. Regression: old path vs new path equivalence
-
-Tests use mock plugins to avoid requiring real TTS dependencies.
-"""
-
-import pytest
-from typing import Any, Iterator
-from unittest.mock import MagicMock, patch
-
-import numpy as np
-
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.errors import EngineError
-from abogen.tts_plugin.plugin_manager import PluginManager, get_plugin_manager, reset_plugin_manager
-from abogen.tts_plugin.utils import Pipeline, create_pipeline
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    Duration,
-    ParameterValues,
-    SynthesisRequest,
-    SynthesizedAudio,
-    VoiceSelection,
-)
-
-
-class MockEngineSession:
-    """Mock EngineSession that records calls for verification."""
-    
-    def __init__(self):
-        self._disposed = False
-        self.synthesize_calls = []
-    
-    def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio:
-        if self._disposed:
-            raise EngineError("Session disposed")
-        
-        self.synthesize_calls.append(request)
-        
-        # Return fake audio
-        audio = np.ones(1000, dtype=np.float32) * 0.5
-        return SynthesizedAudio(
-            data=audio.tobytes(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-            duration=Duration(seconds=1000 / 24000),
-        )
-    
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-class MockEngine:
-    """Mock Engine that creates MockEngineSessions."""
-    
-    def __init__(self, **kwargs):
-        self.kwargs = kwargs
-        self._disposed = False
-        self.sessions_created = []
-    
-    def createSession(self) -> MockEngineSession:
-        if self._disposed:
-            raise EngineError("Engine disposed")
-        session = MockEngineSession()
-        self.sessions_created.append(session)
-        return session
-    
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-def create_mock_plugin(create_engine_func=None):
-    """Helper to create a mock plugin module."""
-    if create_engine_func is None:
-        create_engine_func = lambda **kwargs: MockEngine(**kwargs)
-    
-    from abogen.tts_plugin.manifest import PluginManifest, EngineManifest
-    
-    manifest = PluginManifest(
-        id="mock_tts",
-        name="Mock TTS",
-        version="1.0.0",
-        api_version="1.0",
-        description="Mock TTS for testing",
-        author="Test",
-        capabilities=(),
-        requires=None,
-        engine=EngineManifest(
-            voiceSources=(),
-            parameters=(),
-            audioFormats=(),
-        ),
-    )
-    
-    return {
-        "PLUGIN_MANIFEST": manifest,
-        "MODEL_REQUIREMENTS": [],
-        "create_engine": create_mock_plugin_engine if create_engine_func is None else create_engine_func,
-    }
-
-
-def create_mock_plugin_engine(**kwargs):
-    """Default mock plugin engine factory."""
-    return MockEngine(**kwargs)
-
-
-class TestConsumerFlow:
-    """Consumer Flow Test: consumer → plugin → engine → session → synthesis → result"""
-    
-    def test_full_consumer_flow(self):
-        """Verify complete flow from consumer to audio output."""
-        manager = PluginManager()
-        
-        # Register mock plugin
-        mock_plugin = create_mock_plugin()
-        manager._plugins["mock_tts"] = mock_plugin
-        manager._loaded = True
-        
-        # Step 1: Consumer gets plugin
-        assert manager.has_plugin("mock_tts") is True
-        
-        # Step 2: Plugin creates engine
-        engine = manager.create_engine("mock_tts")
-        assert engine is not None
-        assert isinstance(engine, MockEngine)
-        
-        # Step 3: Engine creates session
-        session = engine.createSession()
-        assert session is not None
-        assert isinstance(session, MockEngineSession)
-        
-        # Step 4: Session synthesizes
-        request = SynthesisRequest(
-            text="Hello world",
-            voice=VoiceSelection(source="builtin", key="default"),
-            parameters=ParameterValues(values={"speed": 1.0}),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        result = session.synthesize(request)
-        
-        # Step 5: Result returned
-        assert result is not None
-        assert isinstance(result, SynthesizedAudio)
-        assert len(result.data) > 0
-        assert result.format.mime == "audio/wav"
-        assert result.duration.seconds > 0
-    
-    def test_consumer_flow_via_pipeline(self):
-        """Verify flow through Pipeline utility matches direct flow."""
-        manager = PluginManager()
-        
-        # Register mock plugin
-        mock_plugin = create_mock_plugin()
-        manager._plugins["mock_tts"] = mock_plugin
-        manager._loaded = True
-        
-        # Use Pipeline utility
-        with patch("abogen.tts_plugin.utils.get_plugin_manager", return_value=manager):
-            backend = create_pipeline("mock_tts")
-            
-            # Call like old TTSBackend
-            segments = list(backend("Hello world", voice="default", speed=1.0))
-            
-            # Verify result
-            assert len(segments) >= 1
-            segment = segments[0]
-            assert hasattr(segment, "graphemes")
-            assert hasattr(segment, "audio")
-            assert segment.graphemes == "Hello world"
-
-
-class TestLifecycle:
-    """Lifecycle Test: dispose, no leaks, error handling"""
-    
-    def test_session_dispose_is_idempotent(self):
-        """dispose() can be called multiple times safely."""
-        session = MockEngineSession()
-        
-        session.dispose()
-        session.dispose()  # Should not raise
-        assert session._disposed is True
-    
-    def test_session_synthesize_after_dispose_raises(self):
-        """synthesize() after dispose() raises EngineError."""
-        session = MockEngineSession()
-        session.dispose()
-        
-        request = SynthesisRequest(
-            text="test",
-            voice=VoiceSelection(source="builtin", key="default"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        
-        with pytest.raises(EngineError):
-            session.synthesize(request)
-    
-    def test_engine_dispose_is_idempotent(self):
-        """Engine dispose() can be called multiple times safely."""
-        engine = MockEngine()
-        
-        engine.dispose()
-        engine.dispose()  # Should not raise
-        assert engine._disposed is True
-    
-    def test_engine_create_session_after_dispose_raises(self):
-        """createSession() after dispose() raises EngineError."""
-        engine = MockEngine()
-        engine.dispose()
-        
-        with pytest.raises(EngineError):
-            engine.createSession()
-    
-    def test_full_lifecycle(self):
-        """Test complete lifecycle: create → use → dispose."""
-        engine = MockEngine()
-        
-        # Create and use session
-        session = engine.createSession()
-        request = SynthesisRequest(
-            text="test",
-            voice=VoiceSelection(source="builtin", key="default"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        result = session.synthesize(request)
-        assert len(result.data) > 0
-        
-        # Dispose session
-        session.dispose()
-        assert session._disposed is True
-        
-        # Dispose engine
-        engine.dispose()
-        assert engine._disposed is True
-    
-    def test_no_session_leak_on_engine_dispose(self):
-        """Engine can be disposed even if sessions were created."""
-        engine = MockEngine()
-        
-        # Create multiple sessions
-        session1 = engine.createSession()
-        session2 = engine.createSession()
-        
-        # Use sessions
-        request = SynthesisRequest(
-            text="test",
-            voice=VoiceSelection(source="builtin", key="default"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        session1.synthesize(request)
-        session2.synthesize(request)
-        
-        # Dispose engine (sessions still exist but engine is disposed)
-        engine.dispose()
-        assert engine._disposed is True
-        
-        # Sessions can still be used (they hold reference to pipeline)
-        result = session1.synthesize(request)
-        assert len(result.data) > 0
-    
-    def test_error_handling_in_synthesis(self):
-        """Error during synthesis is handled correctly."""
-        class FailingSession:
-            def synthesize(self, request):
-                raise EngineError("Synthesis failed")
-            
-            def dispose(self):
-                pass
-        
-        session = FailingSession()
-        request = SynthesisRequest(
-            text="test",
-            voice=VoiceSelection(source="builtin", key="default"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        
-        with pytest.raises(EngineError, match="Synthesis failed"):
-            session.synthesize(request)
-
-
-class TestRegression:
-    """Regression Test: old path vs new path equivalence"""
-    
-    def test_old_path_vs_new_path_same_result(self):
-        """Both paths should produce equivalent results."""
-        # Setup mock plugin
-        manager = PluginManager()
-        mock_plugin = create_mock_plugin()
-        manager._plugins["mock_tts"] = mock_plugin
-        manager._loaded = True
-        
-        # New path: Plugin Manager → Engine → Session → Synthesis
-        with patch("abogen.tts_plugin.utils.get_plugin_manager", return_value=manager):
-            new_backend = create_pipeline("mock_tts")
-            new_segments = list(new_backend("Hello world", voice="default", speed=1.0))
-        
-        # Old path: Direct MockEngine (simulating old registry)
-        old_engine = MockEngine()
-        old_session = old_engine.createSession()
-        request = SynthesisRequest(
-            text="Hello world",
-            voice=VoiceSelection(source="builtin", key="default"),
-            parameters=ParameterValues(values={"speed": 1.0}),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        old_result = old_session.synthesize(request)
-        
-        # Compare results
-        # New path returns segments, old path returns SynthesizedAudio
-        # But both should have valid audio data
-        assert len(new_segments) >= 1
-        assert len(old_result.data) > 0
-        
-        # Both should have same format
-        assert new_segments[0].audio.dtype == np.float32
-    
-    def test_pipeline_matches_old_interface(self):
-        """Pipeline utility should match old TTSBackend interface."""
-        manager = PluginManager()
-        mock_plugin = create_mock_plugin()
-        manager._plugins["mock_tts"] = mock_plugin
-        manager._loaded = True
-        
-        with patch("abogen.tts_plugin.utils.get_plugin_manager", return_value=manager):
-            backend = create_pipeline("mock_tts", lang_code="a", device="cpu")
-            
-            # Old interface: pipeline(text, voice=..., speed=..., split_pattern=...)
-            segments = list(backend(
-                "Hello world",
-                voice="af_heart",
-                speed=1.0,
-                split_pattern=r"\n+"
-            ))
-            
-            # Should return segments with graphemes and audio
-            assert len(segments) >= 1
-            segment = segments[0]
-            assert segment.graphemes == "Hello world"
-            assert isinstance(segment.audio, np.ndarray)
-            assert segment.audio.dtype == np.float32
-            assert len(segment.audio) > 0
-
-
-class TestPluginManagerIntegration:
-    """Integration tests for PluginManager."""
-    
-    def test_plugin_manager_singleton_pattern(self):
-        """Global plugin manager follows singleton pattern."""
-        reset_plugin_manager()
-        
-        manager1 = get_plugin_manager()
-        manager2 = get_plugin_manager()
-        
-        assert manager1 is manager2
-        
-        reset_plugin_manager()
-        
-        manager3 = get_plugin_manager()
-        assert manager1 is not manager3
-    
-    def test_plugin_manager_discover_plugins(self):
-        """Plugin manager can discover plugins from directory."""
-        manager = PluginManager()
-        
-        # Discover from test plugins directory
-        manager.discover("tests/plugins")
-        
-        # Should find valid_plugin
-        # (This depends on test plugins existing)
-        plugins = manager.list_plugins()
-        assert isinstance(plugins, list)
-    
-    def test_plugin_manager_dispose_all(self):
-        """Plugin manager can dispose all cached engines."""
-        manager = PluginManager()
-        
-        # Register mock plugin
-        mock_plugin = create_mock_plugin()
-        manager._plugins["mock_tts"] = mock_plugin
-        manager._loaded = True
-        
-        # Create engines
-        engine1 = manager.get_or_create_engine("mock_tts")
-        engine2 = manager.get_or_create_engine("mock_tts")
-        
-        # Dispose all
-        manager.dispose_all()
-        
-        # Engines should be disposed
-        assert engine1._disposed is True
-        assert engine2._disposed is True
-        
-        # Cache should be empty
-        assert len(manager._engines) == 0
-
-
-class TestNoCompatLayer:
-    """Regression: confirm the compatibility layer has been removed."""
-
-    def test_compat_module_does_not_exist(self):
-        """abogen.tts_plugin.compat must not be importable."""
-        import importlib
-        with pytest.raises((ImportError, ModuleNotFoundError)):
-            importlib.import_module("abogen.tts_plugin.compat")
-
-    def test_consumers_use_plugin_architecture_directly(self):
-        """Key consumers import from abogen.tts_plugin.utils, not compat."""
-        import inspect, abogen.voice_profiles, abogen.voice_formulas, abogen.voice_cache
-
-        for mod in (abogen.voice_profiles, abogen.voice_formulas, abogen.voice_cache):
-            source = inspect.getsource(mod)
-            assert "tts_plugin.compat" not in source, (
-                f"{mod.__name__} still references tts_plugin.compat"
-            )

tests/contracts/test_loader_contract.py

@@ -1,436 +0,0 @@
-"""Comprehensive tests for the plugin loader infrastructure.
-
-These tests verify that the loader correctly:
-- Discovers plugins in directories
-- Imports plugin modules
-- Validates PLUGIN_MANIFEST, MODEL_REQUIREMENTS, create_engine
-- Validates api_version compatibility
-- Validates capabilities
-- Provides diagnostic messages for errors
-- Rejects invalid plugins
-"""
-
-from __future__ import annotations
-
-import sys
-from pathlib import Path
-
-import pytest
-
-from abogen.tts_plugin.loader import (
-    HOST_API_VERSION,
-    PluginLoadError,
-    PluginLoadResult,
-    _check_api_version_compatibility,
-    _parse_api_version,
-    _validate_api_version,
-    _validate_capabilities,
-    _validate_manifest,
-    discover_plugins,
-    load_plugin,
-    load_plugin_from_dir,
-)
-from abogen.tts_plugin.manifest import (
-    EngineManifest,
-    ModelManifest,
-    PluginManifest,
-)
-
-
-# ──────────────────────────────────────────────────────────────
-# Path fixtures
-# ──────────────────────────────────────────────────────────────
-
-@pytest.fixture
-def plugins_dir() -> Path:
-    return Path(__file__).parent.parent / "plugins"
-
-
-@pytest.fixture
-def fake_plugin_dir(plugins_dir: Path) -> Path:
-    return plugins_dir / "fake_plugin"
-
-
-@pytest.fixture
-def missing_manifest_dir(plugins_dir: Path) -> Path:
-    return plugins_dir / "missing_manifest"
-
-
-@pytest.fixture
-def invalid_api_version_dir(plugins_dir: Path) -> Path:
-    return plugins_dir / "invalid_api_version"
-
-
-@pytest.fixture
-def invalid_capabilities_dir(plugins_dir: Path) -> Path:
-    return plugins_dir / "invalid_capabilities"
-
-
-@pytest.fixture
-def missing_create_engine_dir(plugins_dir: Path) -> Path:
-    return plugins_dir / "missing_create_engine"
-
-
-@pytest.fixture
-def import_error_dir(plugins_dir: Path) -> Path:
-    return plugins_dir / "import_error"
-
-
-@pytest.fixture
-def missing_model_requirements_dir(plugins_dir: Path) -> Path:
-    return plugins_dir / "missing_model_requirements"
-
-
-# ──────────────────────────────────────────────────────────────
-# Unit tests: _parse_api_version
-# ──────────────────────────────────────────────────────────────
-
-class TestParseApiVersion:
-    def test_valid_version(self) -> None:
-        assert _parse_api_version("1.0") == (1, 0)
-        assert _parse_api_version("2.5") == (2, 5)
-        assert _parse_api_version("10.20") == (10, 20)
-
-    def test_invalid_format(self) -> None:
-        assert _parse_api_version("1") is None
-        assert _parse_api_version("1.0.0") is None
-        assert _parse_api_version("abc") is None
-        assert _parse_api_version("") is None
-        assert _parse_api_version("1.x") is None
-
-
-# ──────────────────────────────────────────────────────────────
-# Unit tests: _check_api_version_compatibility
-# ──────────────────────────────────────────────────────────────
-
-class TestCheckApiVersionCompatibility:
-    def test_compatible_version(self) -> None:
-        assert _check_api_version_compatibility("1.0") is None
-        assert _check_api_version_compatibility("1.5") is None
-
-    def test_major_mismatch(self) -> None:
-        error = _check_api_version_compatibility("2.0")
-        assert error is not None
-        assert "major mismatch" in error
-
-    def test_invalid_format(self) -> None:
-        error = _check_api_version_compatibility("invalid")
-        assert error is not None
-        assert "Invalid api_version format" in error
-
-
-# ──────────────────────────────────────────────────────────────
-# Unit tests: _validate_manifest
-# ──────────────────────────────────────────────────────────────
-
-class TestValidateManifest:
-    def test_valid_manifest(self) -> None:
-        class FakeModule:
-            PLUGIN_MANIFEST = PluginManifest(
-                id="test", name="Test", version="1.0.0",
-                api_version="1.0", description="Test", author="Test",
-            )
-            MODEL_REQUIREMENTS: list = []
-            create_engine = lambda *a, **kw: None
-
-        errors = _validate_manifest(FakeModule(), Path("/tmp"))
-        assert errors == []
-
-    def test_missing_manifest(self) -> None:
-        class FakeModule:
-            MODEL_REQUIREMENTS: list = []
-            create_engine = lambda *a, **kw: None
-
-        errors = _validate_manifest(FakeModule(), Path("/tmp"))
-        assert any("Missing PLUGIN_MANIFEST" in e for e in errors)
-
-    def test_wrong_manifest_type(self) -> None:
-        class FakeModule:
-            PLUGIN_MANIFEST = "not a manifest"
-            MODEL_REQUIREMENTS: list = []
-            create_engine = lambda *a, **kw: None
-
-        errors = _validate_manifest(FakeModule(), Path("/tmp"))
-        assert any("PluginManifest instance" in e for e in errors)
-
-    def test_missing_model_requirements(self) -> None:
-        class FakeModule:
-            PLUGIN_MANIFEST = PluginManifest(
-                id="test", name="Test", version="1.0.0",
-                api_version="1.0", description="Test", author="Test",
-            )
-            create_engine = lambda *a, **kw: None
-
-        errors = _validate_manifest(FakeModule(), Path("/tmp"))
-        assert any("Missing MODEL_REQUIREMENTS" in e for e in errors)
-
-    def test_wrong_model_requirements_type(self) -> None:
-        class FakeModule:
-            PLUGIN_MANIFEST = PluginManifest(
-                id="test", name="Test", version="1.0.0",
-                api_version="1.0", description="Test", author="Test",
-            )
-            MODEL_REQUIREMENTS = "not a list"
-            create_engine = lambda *a, **kw: None
-
-        errors = _validate_manifest(FakeModule(), Path("/tmp"))
-        assert any("must be a list" in e for e in errors)
-
-    def test_invalid_model_requirements_item(self) -> None:
-        class FakeModule:
-            PLUGIN_MANIFEST = PluginManifest(
-                id="test", name="Test", version="1.0.0",
-                api_version="1.0", description="Test", author="Test",
-            )
-            MODEL_REQUIREMENTS = ["not a model manifest"]
-            create_engine = lambda *a, **kw: None
-
-        errors = _validate_manifest(FakeModule(), Path("/tmp"))
-        assert any("ModelManifest instance" in e for e in errors)
-
-    def test_missing_create_engine(self) -> None:
-        class FakeModule:
-            PLUGIN_MANIFEST = PluginManifest(
-                id="test", name="Test", version="1.0.0",
-                api_version="1.0", description="Test", author="Test",
-            )
-            MODEL_REQUIREMENTS: list = []
-
-        errors = _validate_manifest(FakeModule(), Path("/tmp"))
-        assert any("Missing create_engine" in e for e in errors)
-
-    def test_create_engine_not_callable(self) -> None:
-        class FakeModule:
-            PLUGIN_MANIFEST = PluginManifest(
-                id="test", name="Test", version="1.0.0",
-                api_version="1.0", description="Test", author="Test",
-            )
-            MODEL_REQUIREMENTS: list = []
-            create_engine = "not callable"
-
-        errors = _validate_manifest(FakeModule(), Path("/tmp"))
-        assert any("must be callable" in e for e in errors)
-
-
-# ──────────────────────────────────────────────────────────────
-# Unit tests: _validate_capabilities
-# ──────────────────────────────────────────────────────────────
-
-class TestValidateCapabilities:
-    def test_valid_capabilities(self) -> None:
-        manifest = PluginManifest(
-            id="test", name="Test", version="1.0.0",
-            api_version="1.0", description="Test", author="Test",
-            capabilities=("voice_list", "preview"),
-        )
-        errors = _validate_capabilities(manifest)
-        assert errors == []
-
-    def test_unknown_capability(self) -> None:
-        manifest = PluginManifest(
-            id="test", name="Test", version="1.0.0",
-            api_version="1.0", description="Test", author="Test",
-            capabilities=("voice_list", "unknown_cap"),
-        )
-        errors = _validate_capabilities(manifest)
-        assert any("unknown_cap" in e for e in errors)
-
-    def test_empty_capabilities(self) -> None:
-        manifest = PluginManifest(
-            id="test", name="Test", version="1.0.0",
-            api_version="1.0", description="Test", author="Test",
-            capabilities=(),
-        )
-        errors = _validate_capabilities(manifest)
-        assert errors == []
-
-
-# ──────────────────────────────────────────────────────────────
-# Unit tests: _validate_api_version
-# ──────────────────────────────────────────────────────────────
-
-class TestValidateApiVersion:
-    def test_compatible(self) -> None:
-        manifest = PluginManifest(
-            id="test", name="Test", version="1.0.0",
-            api_version="1.0", description="Test", author="Test",
-        )
-        errors = _validate_api_version(manifest)
-        assert errors == []
-
-    def test_incompatible(self) -> None:
-        manifest = PluginManifest(
-            id="test", name="Test", version="1.0.0",
-            api_version="2.0", description="Test", author="Test",
-        )
-        errors = _validate_api_version(manifest)
-        assert len(errors) > 0
-
-
-# ──────────────────────────────────────────────────────────────
-# Integration tests: load_plugin_from_dir
-# ──────────────────────────────────────────────────────────────
-
-class TestLoadPluginFromDir:
-    def test_load_valid_plugin(self, fake_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(fake_plugin_dir)
-        assert result.success is True
-        assert result.manifest is not None
-        assert result.manifest.id == "fake_plugin"
-        assert result.model_requirements is not None
-        assert result.create_engine is not None
-        assert result.module is not None
-        assert result.error is None
-
-    def test_plugin_satisfies_protocol(self, fake_plugin_dir: Path) -> None:
-        from abogen.tts_plugin.engine import Engine
-        from abogen.tts_plugin.host_context import HostContext
-        import logging
-
-        result = load_plugin_from_dir(fake_plugin_dir)
-        assert result.success is True
-
-        # Create engine using the loaded create_engine function
-        ctx = HostContext(
-            config_dir=Path("/tmp/test"),
-            logger=logging.getLogger("test"),
-            http_client=type("FakeClient", (), {"get": lambda s, **kw: None, "post": lambda s, **kw: None})(),
-        )
-        engine = result.create_engine(ctx, None, __import__("abogen.tts_plugin.types", fromlist=["EngineConfig"]).EngineConfig())
-        assert isinstance(engine, Engine)
-        engine.dispose()
-
-    def test_nonexistent_directory(self, tmp_path: Path) -> None:
-        result = load_plugin_from_dir(tmp_path / "nonexistent")
-        assert result.success is False
-        assert result.error is not None
-        assert "does not exist" in result.error.errors[0]
-
-    def test_missing_init_file(self, tmp_path: Path) -> None:
-        plugin_dir = tmp_path / "no_init"
-        plugin_dir.mkdir()
-        result = load_plugin_from_dir(plugin_dir)
-        assert result.success is False
-        assert result.error is not None
-        assert "__init__.py" in result.error.errors[0]
-
-    def test_import_error(self, import_error_dir: Path) -> None:
-        result = load_plugin_from_dir(import_error_dir)
-        assert result.success is False
-        assert result.error is not None
-        assert "Failed to import" in result.error.errors[0]
-
-
-# ──────────────────────────────────────────────────────────────
-# Integration tests: invalid plugins
-# ──────────────────────────────────────────────────────────────
-
-class TestInvalidPlugins:
-    def test_missing_manifest(self, missing_manifest_dir: Path) -> None:
-        result = load_plugin_from_dir(missing_manifest_dir)
-        assert result.success is False
-        assert result.error is not None
-        assert any("Missing PLUGIN_MANIFEST" in e for e in result.error.errors)
-
-    def test_invalid_api_version(self, invalid_api_version_dir: Path) -> None:
-        result = load_plugin_from_dir(invalid_api_version_dir)
-        assert result.success is False
-        assert result.error is not None
-        assert any("major mismatch" in e for e in result.error.errors)
-
-    def test_invalid_capabilities(self, invalid_capabilities_dir: Path) -> None:
-        result = load_plugin_from_dir(invalid_capabilities_dir)
-        assert result.success is False
-        assert result.error is not None
-        assert any("Unknown capability" in e for e in result.error.errors)
-
-    def test_missing_create_engine(self, missing_create_engine_dir: Path) -> None:
-        result = load_plugin_from_dir(missing_create_engine_dir)
-        assert result.success is False
-        assert result.error is not None
-        assert any("Missing create_engine" in e for e in result.error.errors)
-
-    def test_missing_model_requirements(self, missing_model_requirements_dir: Path) -> None:
-        result = load_plugin_from_dir(missing_model_requirements_dir)
-        assert result.success is False
-        assert result.error is not None
-        assert any("Missing MODEL_REQUIREMENTS" in e for e in result.error.errors)
-
-
-# ──────────────────────────────────────────────────────────────
-# Integration tests: discover_plugins
-# ──────────────────────────────────────────────────────────────
-
-class TestDiscoverPlugins:
-    def test_discover_from_valid_dir(self, plugins_dir: Path) -> None:
-        results = discover_plugins([plugins_dir])
-        # Should find multiple plugins (valid and invalid)
-        assert len(results) > 0
-
-    def test_discover_includes_valid_plugin(self, plugins_dir: Path) -> None:
-        results = discover_plugins([plugins_dir])
-        valid = [r for r in results if r.success]
-        assert len(valid) >= 1
-        assert any(r.manifest and r.manifest.id == "fake_plugin" for r in valid)
-
-    def test_discover_includes_invalid_plugins(self, plugins_dir: Path) -> None:
-        results = discover_plugins([plugins_dir])
-        invalid = [r for r in results if not r.success]
-        assert len(invalid) >= 1
-
-    def test_discover_nonexistent_dir(self, tmp_path: Path) -> None:
-        results = discover_plugins([tmp_path / "nonexistent"])
-        assert results == []
-
-    def test_discover_multiple_dirs(self, plugins_dir: Path, tmp_path: Path) -> None:
-        results = discover_plugins([plugins_dir, tmp_path / "nonexistent"])
-        assert len(results) > 0
-
-
-# ──────────────────────────────────────────────────────────────
-# Diagnostic messages tests
-# ──────────────────────────────────────────────────────────────
-
-class TestDiagnosticMessages:
-    def test_error_contains_plugin_id(self, missing_manifest_dir: Path) -> None:
-        result = load_plugin_from_dir(missing_manifest_dir)
-        assert result.error is not None
-        assert result.error.plugin_id == "missing_manifest"
-
-    def test_error_contains_path(self, missing_manifest_dir: Path) -> None:
-        result = load_plugin_from_dir(missing_manifest_dir)
-        assert result.error is not None
-        assert result.error.path == missing_manifest_dir
-
-    def test_error_contains_messages(self, missing_manifest_dir: Path) -> None:
-        result = load_plugin_from_dir(missing_manifest_dir)
-        assert result.error is not None
-        assert len(result.error.errors) > 0
-
-    def test_multiple_errors(self, invalid_api_version_dir: Path) -> None:
-        # This plugin has multiple issues
-        result = load_plugin_from_dir(invalid_api_version_dir)
-        assert result.error is not None
-        # Should have at least the api_version error
-        assert len(result.error.errors) >= 1
-
-
-# ──────────────────────────────────────────────────────────────
-# No partial registration tests
-# ──────────────────────────────────────────────────────────────
-
-class TestNoPartialRegistration:
-    def test_invalid_plugin_no_manifest_attr(self, missing_manifest_dir: Path) -> None:
-        """After failed load, module should not remain in sys.modules."""
-        result = load_plugin_from_dir(missing_manifest_dir)
-        assert result.success is False
-        # Module should not be registered
-        module_name = f"abogen.tts_plugin._loaded.missing_manifest"
-        assert module_name not in sys.modules
-
-    def test_import_error_no_registration(self, import_error_dir: Path) -> None:
-        """After import error, module should not remain in sys.modules."""
-        result = load_plugin_from_dir(import_error_dir)
-        assert result.success is False
-        module_name = f"abogen.tts_plugin._loaded.import_error"
-        assert module_name not in sys.modules

tests/contracts/test_manifest_contract.py

@@ -1,290 +0,0 @@
-"""Contract tests for plugin manifest types.
-
-These tests verify that manifest types satisfy the architectural requirements:
-- All required fields are present
-- api_version follows semver format
-- capabilities are properly defined
-- engine manifest describes the engine correctly
-"""
-
-import re
-
-import pytest
-
-from abogen.tts_plugin.manifest import (
-    AudioFormatManifest,
-    EngineManifest,
-    EnumOption,
-    GpuRequirement,
-    ModelManifest,
-    ParameterManifest,
-    PluginManifest,
-    RequirementManifest,
-    VoiceManifest,
-    VoiceSourceManifest,
-)
-
-
-class TestPluginManifestContract:
-    """Contract tests for PluginManifest."""
-
-    def test_required_fields(self) -> None:
-        manifest = PluginManifest(
-            id="test-plugin",
-            name="Test Plugin",
-            version="1.0.0",
-            api_version="1.0",
-            description="A test plugin",
-            author="Test Author",
-        )
-        assert manifest.id == "test-plugin"
-        assert manifest.name == "Test Plugin"
-        assert manifest.version == "1.0.0"
-        assert manifest.api_version == "1.0"
-        assert manifest.description == "A test plugin"
-        assert manifest.author == "Test Author"
-
-    def test_api_version_semver_format(self) -> None:
-        """Architecture spec: api_version format is semver (MAJOR.MINOR)."""
-        valid_versions = ["1.0", "2.1", "10.5"]
-        for version in valid_versions:
-            manifest = PluginManifest(
-                id="test",
-                name="Test",
-                version="1.0.0",
-                api_version=version,
-                description="Test",
-                author="Test",
-            )
-            assert re.match(r"^\d+\.\d+$", manifest.api_version)
-
-    def test_capabilities_default_empty(self) -> None:
-        manifest = PluginManifest(
-            id="test",
-            name="Test",
-            version="1.0.0",
-            api_version="1.0",
-            description="Test",
-            author="Test",
-        )
-        assert manifest.capabilities == ()
-
-    def test_capabilities_tuple(self) -> None:
-        manifest = PluginManifest(
-            id="test",
-            name="Test",
-            version="1.0.0",
-            api_version="1.0",
-            description="Test",
-            author="Test",
-            capabilities=("voice_list", "preview"),
-        )
-        assert "voice_list" in manifest.capabilities
-        assert "preview" in manifest.capabilities
-
-    def test_requires_default(self) -> None:
-        manifest = PluginManifest(
-            id="test",
-            name="Test",
-            version="1.0.0",
-            api_version="1.0",
-            description="Test",
-            author="Test",
-        )
-        assert isinstance(manifest.requires, RequirementManifest)
-
-    def test_engine_default(self) -> None:
-        manifest = PluginManifest(
-            id="test",
-            name="Test",
-            version="1.0.0",
-            api_version="1.0",
-            description="Test",
-            author="Test",
-        )
-        assert isinstance(manifest.engine, EngineManifest)
-
-
-class TestEngineManifestContract:
-    """Contract tests for EngineManifest."""
-
-    def test_required_fields(self) -> None:
-        manifest = EngineManifest(
-            voiceSources=(
-                VoiceSourceManifest(id="builtin", name="Builtin", type="list"),
-            ),
-            parameters=(
-                ParameterManifest(
-                    id="speed", name="Speed", description="Speed", type="float", default=1.0
-                ),
-            ),
-            audioFormats=(AudioFormatManifest(mime="audio/wav", extension="wav"),),
-        )
-        assert len(manifest.voiceSources) == 1
-        assert len(manifest.parameters) == 1
-        assert len(manifest.audioFormats) == 1
-
-    def test_defaults_empty(self) -> None:
-        manifest = EngineManifest()
-        assert manifest.voiceSources == ()
-        assert manifest.parameters == ()
-        assert manifest.audioFormats == ()
-
-
-class TestVoiceSourceManifestContract:
-    """Contract tests for VoiceSourceManifest."""
-
-    def test_required_fields(self) -> None:
-        vs = VoiceSourceManifest(id="builtin", name="Builtin", type="list")
-        assert vs.id == "builtin"
-        assert vs.name == "Builtin"
-        assert vs.type == "list"
-
-    def test_valid_types(self) -> None:
-        valid_types = ["list", "speaker_id", "clone", "blend", "generate", "none"]
-        for vtype in valid_types:
-            vs = VoiceSourceManifest(id="test", name="Test", type=vtype)
-            assert vs.type == vtype
-
-    def test_config_optional(self) -> None:
-        vs = VoiceSourceManifest(id="test", name="Test", type="list")
-        assert vs.config is None
-
-    def test_config_any(self) -> None:
-        config = {"voices": ["af_nova", "af_sky"]}
-        vs = VoiceSourceManifest(id="test", name="Test", type="list", config=config)
-        assert vs.config == config
-
-
-class TestVoiceManifestContract:
-    """Contract tests for VoiceManifest."""
-
-    def test_required_fields(self) -> None:
-        v = VoiceManifest(id="af_nova", name="Nova")
-        assert v.id == "af_nova"
-        assert v.name == "Nova"
-
-    def test_tags_default_empty(self) -> None:
-        v = VoiceManifest(id="af_nova", name="Nova")
-        assert v.tags == ()
-
-    def test_tags_tuple(self) -> None:
-        v = VoiceManifest(id="af_nova", name="Nova", tags=("en", "female"))
-        assert "en" in v.tags
-        assert "female" in v.tags
-
-
-class TestParameterManifestContract:
-    """Contract tests for ParameterManifest."""
-
-    def test_required_fields(self) -> None:
-        p = ParameterManifest(
-            id="speed", name="Speed", description="Speech speed", type="float", default=1.0
-        )
-        assert p.id == "speed"
-        assert p.name == "Speed"
-        assert p.description == "Speech speed"
-        assert p.type == "float"
-        assert p.default == 1.0
-
-    def test_valid_types(self) -> None:
-        valid_types = ["float", "int", "string", "boolean", "enum"]
-        for ptype in valid_types:
-            p = ParameterManifest(
-                id="test", name="Test", description="Test", type=ptype, default=None
-            )
-            assert p.type == ptype
-
-    def test_optional_numeric_bounds(self) -> None:
-        p = ParameterManifest(
-            id="speed",
-            name="Speed",
-            description="Speed",
-            type="float",
-            default=1.0,
-            min=0.5,
-            max=2.0,
-            step=0.1,
-        )
-        assert p.min == 0.5
-        assert p.max == 2.0
-        assert p.step == 0.1
-
-    def test_enum_options(self) -> None:
-        options = (
-            EnumOption(value="low", label="Low"),
-            EnumOption(value="high", label="High"),
-        )
-        p = ParameterManifest(
-            id="quality",
-            name="Quality",
-            description="Quality",
-            type="enum",
-            default="low",
-            options=options,
-        )
-        assert len(p.options) == 2
-        assert p.options[0].value == "low"
-
-
-class TestAudioFormatManifestContract:
-    """Contract tests for AudioFormatManifest."""
-
-    def test_required_fields(self) -> None:
-        af = AudioFormatManifest(mime="audio/wav", extension="wav")
-        assert af.mime == "audio/wav"
-        assert af.extension == "wav"
-
-
-class TestEnumOptionContract:
-    """Contract tests for EnumOption."""
-
-    def test_required_fields(self) -> None:
-        opt = EnumOption(value="low", label="Low Quality")
-        assert opt.value == "low"
-        assert opt.label == "Low Quality"
-
-
-class TestRequirementManifestContract:
-    """Contract tests for RequirementManifest."""
-
-    def test_defaults(self) -> None:
-        req = RequirementManifest()
-        assert req.gpu is None
-        assert req.memory is None
-        assert req.internet is None
-
-    def test_with_gpu(self) -> None:
-        gpu = GpuRequirement(required=True, type="cuda", memory=8.0)
-        req = RequirementManifest(gpu=gpu)
-        assert req.gpu.required is True
-        assert req.gpu.type == "cuda"
-        assert req.gpu.memory == 8.0
-
-    def test_with_internet(self) -> None:
-        req = RequirementManifest(internet=True)
-        assert req.internet is True
-
-
-class TestGpuRequirementContract:
-    """Contract tests for GpuRequirement."""
-
-    def test_defaults(self) -> None:
-        gpu = GpuRequirement()
-        assert gpu.required is False
-        assert gpu.type is None
-        assert gpu.memory is None
-
-    def test_required_gpu(self) -> None:
-        gpu = GpuRequirement(required=True, type="cuda", memory=8.0)
-        assert gpu.required is True
-
-
-class TestModelManifestContract:
-    """Contract tests for ModelManifest."""
-
-    def test_required_fields(self) -> None:
-        m = ModelManifest(id="xtts_v2", name="XTTS v2", size="2GB")
-        assert m.id == "xtts_v2"
-        assert m.name == "XTTS v2"
-        assert m.size == "2GB"

tests/contracts/test_plugin_contract.py

@@ -1,146 +0,0 @@
-"""Contract tests for plugin contract.
-
-These tests verify that plugin modules satisfy the architectural requirements:
-- Must export PLUGIN_MANIFEST: PluginManifest
-- Must export MODEL_REQUIREMENTS: list[ModelManifest]
-- Must export create_engine: Callable[[HostContext, Path | None, EngineConfig], Engine]
-- create_engine() must be atomic
-"""
-
-import logging
-from pathlib import Path
-from typing import Any
-
-import pytest
-
-from abogen.tts_plugin.engine import Engine
-from abogen.tts_plugin.host_context import HostContext
-from abogen.tts_plugin.manifest import EngineManifest, ModelManifest, PluginManifest
-from abogen.tts_plugin.plugin import Plugin
-from abogen.tts_plugin.types import EngineConfig
-
-from .conftest import FakeEngine
-
-
-class FakePluginModule:
-    """Stub plugin module that satisfies the plugin contract."""
-
-    PLUGIN_MANIFEST = PluginManifest(
-        id="fake-plugin",
-        name="Fake Plugin",
-        version="1.0.0",
-        api_version="1.0",
-        description="A fake plugin for testing",
-        author="Test Author",
-        capabilities=(),
-        engine=EngineManifest(),
-    )
-
-    MODEL_REQUIREMENTS: list[ModelManifest] = []
-
-    @staticmethod
-    def create_engine(
-        context: HostContext,
-        model_path: Path | None,
-        config: EngineConfig,
-    ) -> Engine:
-        return FakeEngine()
-
-
-class TestPluginProtocolContract:
-    """Contract tests for the Plugin protocol."""
-
-    def test_plugin_is_protocol(self) -> None:
-        assert hasattr(Plugin, "__protocol_attrs__")
-
-
-class TestPluginExportsContract:
-    """Contract tests for required plugin exports."""
-
-    def test_plugin_has_plugin_manifest(self) -> None:
-        """Architecture spec: Plugin must export PLUGIN_MANIFEST."""
-        assert hasattr(FakePluginModule, "PLUGIN_MANIFEST")
-        assert isinstance(FakePluginModule.PLUGIN_MANIFEST, PluginManifest)
-
-    def test_plugin_has_model_requirements(self) -> None:
-        """Architecture spec: Plugin must export MODEL_REQUIREMENTS."""
-        assert hasattr(FakePluginModule, "MODEL_REQUIREMENTS")
-        assert isinstance(FakePluginModule.MODEL_REQUIREMENTS, list)
-
-    def test_plugin_has_create_engine(self) -> None:
-        """Architecture spec: Plugin must export create_engine."""
-        assert hasattr(FakePluginModule, "create_engine")
-        assert callable(FakePluginModule.create_engine)
-
-    def test_plugin_manifest_required_fields(self) -> None:
-        """Architecture spec: PluginManifest has required fields."""
-        manifest = FakePluginModule.PLUGIN_MANIFEST
-        assert manifest.id
-        assert manifest.name
-        assert manifest.version
-        assert manifest.api_version
-        assert manifest.description
-        assert manifest.author
-
-    def test_plugin_manifest_capabilities_is_tuple(self) -> None:
-        manifest = FakePluginModule.PLUGIN_MANIFEST
-        assert isinstance(manifest.capabilities, tuple)
-
-
-class TestCreateEngineContract:
-    """Contract tests for create_engine() function."""
-
-    def test_create_engine_returns_engine(self) -> None:
-        """Architecture spec: create_engine() returns Engine."""
-        ctx = HostContext(
-            config_dir=Path("/tmp/test"),
-            logger=logging.getLogger("test"),
-            http_client=type("FakeClient", (), {"get": lambda self, **kw: None, "post": lambda self, **kw: None})(),
-        )
-        engine = FakePluginModule.create_engine(ctx, None, EngineConfig())
-        assert isinstance(engine, Engine)
-
-    def test_create_engine_atomic(self) -> None:
-        """Architecture spec: create_engine() is atomic (all-or-nothing)."""
-        ctx = HostContext(
-            config_dir=Path("/tmp/test"),
-            logger=logging.getLogger("test"),
-            http_client=type("FakeClient", (), {"get": lambda self, **kw: None, "post": lambda self, **kw: None})(),
-        )
-        engine = FakePluginModule.create_engine(ctx, None, EngineConfig())
-        assert isinstance(engine, Engine)
-        engine.dispose()
-
-    def test_create_engine_with_none_model_path(self) -> None:
-        """Architecture spec: model_path can be None for cloud/no-model engines."""
-        ctx = HostContext(
-            config_dir=Path("/tmp/test"),
-            logger=logging.getLogger("test"),
-            http_client=type("FakeClient", (), {"get": lambda self, **kw: None, "post": lambda self, **kw: None})(),
-        )
-        engine = FakePluginModule.create_engine(ctx, None, EngineConfig())
-        assert isinstance(engine, Engine)
-        engine.dispose()
-
-    def test_create_engine_with_model_path(self) -> None:
-        """Architecture spec: model_path is Path | None."""
-        ctx = HostContext(
-            config_dir=Path("/tmp/test"),
-            logger=logging.getLogger("test"),
-            http_client=type("FakeClient", (), {"get": lambda self, **kw: None, "post": lambda self, **kw: None})(),
-        )
-        engine = FakePluginModule.create_engine(ctx, Path("/models/test"), EngineConfig())
-        assert isinstance(engine, Engine)
-        engine.dispose()
-
-
-class TestModelRequirementsContract:
-    """Contract tests for MODEL_REQUIREMENTS."""
-
-    def test_model_requirements_is_list(self) -> None:
-        assert isinstance(FakePluginModule.MODEL_REQUIREMENTS, list)
-
-    def test_model_requirements_contains_model_manifests(self) -> None:
-        """If non-empty, each item must be a ModelManifest."""
-        for req in FakePluginModule.MODEL_REQUIREMENTS:
-            assert isinstance(req, ModelManifest)

tests/contracts/test_plugin_manager_contract.py

@@ -1,274 +0,0 @@
-"""Integration tests for Plugin Manager and direct utility functions."""
-
-import pytest
-from unittest.mock import MagicMock, patch
-
-from abogen.tts_plugin.plugin_manager import PluginManager, get_plugin_manager, reset_plugin_manager
-from abogen.tts_plugin.utils import Pipeline, create_pipeline
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.types import SynthesisRequest, SynthesizedAudio, AudioFormat
-
-
-class FakeEngine:
-    """Fake Engine for testing."""
-    
-    def __init__(self, **kwargs):
-        self.kwargs = kwargs
-        self._disposed = False
-    
-    def createSession(self):
-        return FakeEngineSession()
-    
-    def dispose(self):
-        self._disposed = True
-    
-    @property
-    def manifest(self):
-        return MagicMock()
-
-
-class FakeEngineSession:
-    """Fake EngineSession for testing."""
-    
-    def __init__(self):
-        self._disposed = False
-    
-    def synthesize(self, request):
-        # Return fake audio
-        import numpy as np
-        from abogen.tts_plugin.types import AudioFormat, Duration, SynthesizedAudio
-        
-        audio = np.zeros(1000, dtype=np.float32)
-        return SynthesizedAudio(
-            data=audio.tobytes(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-            duration=Duration(seconds=0.04167),  # 1000 samples / 24000 Hz
-        )
-    
-    def dispose(self):
-        self._disposed = True
-
-
-class TestPluginManager:
-    """Test PluginManager functionality."""
-    
-    def test_plugin_manager_creation(self):
-        """PluginManager can be created."""
-        manager = PluginManager()
-        assert manager is not None
-    
-    def test_plugin_manager_list_discovers_plugins(self):
-        """PluginManager discovers plugins from plugins directory."""
-        manager = PluginManager()
-        manager.discover("plugins")
-        plugins = manager.list_plugins()
-        # Should discover kokoro plugin if it exists
-        assert isinstance(plugins, list)
-    
-    def test_plugin_manager_has_plugin_after_discover(self):
-        """PluginManager reports plugins after discovery."""
-        manager = PluginManager()
-        manager.discover("plugins")
-        # kokoro plugin should be discovered if plugins/kokoro exists
-        # This is expected behavior
-        assert isinstance(manager._plugins, dict)
-    
-    def test_plugin_manager_get_plugin_after_discover(self):
-        """PluginManager returns plugin info after discovery."""
-        manager = PluginManager()
-        manager.discover("plugins")
-        # kokoro plugin should be discovered if plugins/kokoro exists
-        assert isinstance(manager._plugins, dict)
-    
-    def test_plugin_manager_create_engine_not_found(self):
-        """PluginManager raises KeyError for unknown plugins."""
-        manager = PluginManager()
-        with pytest.raises(KeyError, match="Plugin not found"):
-            manager.create_engine("nonexistent")
-    
-    def test_plugin_manager_discover_with_empty_dir(self):
-        """PluginManager handles missing plugins directory."""
-        manager = PluginManager()
-        manager.discover("/nonexistent/path")
-        plugins = manager.list_plugins()
-        assert plugins == []
-    
-    def test_global_plugin_manager_singleton(self):
-        """Global PluginManager is a singleton."""
-        reset_plugin_manager()
-        manager1 = get_plugin_manager()
-        manager2 = get_plugin_manager()
-        assert manager1 is manager2
-        reset_plugin_manager()
-    
-    def test_reset_plugin_manager(self):
-        """reset_plugin_manager clears the singleton."""
-        manager1 = get_plugin_manager()
-        reset_plugin_manager()
-        manager2 = get_plugin_manager()
-        assert manager1 is not manager2
-        reset_plugin_manager()
-
-
-class TestPipeline:
-    """Test Pipeline functionality."""
-    
-    def test_pipeline_creation(self):
-        """Pipeline can be created."""
-        engine = FakeEngine()
-        backend = Pipeline(engine)
-        assert backend is not None
-    
-    def test_pipeline_callable(self):
-        """Pipeline is callable like old TTSBackend."""
-        engine = FakeEngine()
-        backend = Pipeline(engine)
-        
-        # Should be callable
-        assert callable(backend)
-    
-    def test_pipeline_synthesize(self):
-        """Pipeline can synthesize text."""
-        engine = FakeEngine()
-        backend = Pipeline(engine)
-        
-        # Call the backend
-        segments = list(backend("Hello world", voice="default", speed=1.0))
-        
-        # Should return at least one segment
-        assert len(segments) >= 1
-        
-        # Segment should have graphemes and audio
-        segment = segments[0]
-        assert hasattr(segment, "graphemes")
-        assert hasattr(segment, "audio")
-        assert segment.graphemes == "Hello world"
-    
-    def test_pipeline_dispose(self):
-        """Pipeline can be disposed."""
-        engine = FakeEngine()
-        backend = Pipeline(engine)
-        
-        # Create a session by calling
-        list(backend("test"))
-        
-        # Dispose should not raise
-        backend.dispose()
-        
-        # Double dispose should be safe
-        backend.dispose()
-
-
-class TestCreatePipelineCompat:
-    """Test create_pipeline utility function."""
-    
-    def test_create_pipeline_returns_callable(self):
-        """create_pipeline returns a callable backend."""
-        from abogen.tts_plugin.host_context import HostContext
-        from abogen.tts_plugin.types import EngineConfig
-
-        # Mock the plugin manager
-        with patch("abogen.tts_plugin.utils.get_plugin_manager") as mock_get_manager:
-            mock_manager = MagicMock()
-            mock_get_manager.return_value = mock_manager
-            
-            mock_engine = FakeEngine()
-            mock_manager.create_engine.return_value = mock_engine
-            
-            backend = create_pipeline("kokoro", lang_code="a", device="cpu")
-            
-            assert callable(backend)
-            mock_manager.create_engine.assert_called_once()
-            call_args = mock_manager.create_engine.call_args
-            assert call_args.args[0] == "kokoro"
-            assert isinstance(call_args.kwargs["context"], HostContext)
-            assert call_args.kwargs["model_path"] is None
-            assert isinstance(call_args.kwargs["config"], EngineConfig)
-            assert call_args.kwargs["config"].device == "cpu"
-            assert call_args.kwargs["config"].lang_code == "a"
-    
-    def test_create_pipeline_raises_for_unknown_plugin(self):
-        """create_pipeline raises KeyError for unknown plugins."""
-        with patch("abogen.tts_plugin.utils.get_plugin_manager") as mock_get_manager:
-            mock_manager = MagicMock()
-            mock_get_manager.return_value = mock_manager
-            mock_manager.create_engine.side_effect = KeyError("Plugin not found")
-            
-            with pytest.raises(KeyError):
-                create_pipeline("nonexistent")
-
-
-class TestPluginManagerWithFakePlugins:
-    """Test PluginManager with fake plugin loading."""
-    
-    def test_plugin_manager_create_engine_from_plugin(self):
-        """PluginManager creates engine from loaded plugin."""
-        manager = PluginManager()
-        
-        # Manually add a fake plugin
-        def fake_create_engine(**kwargs):
-            return FakeEngine(**kwargs)
-        
-        manager._plugins["fake"] = {
-            "manifest": MagicMock(),
-            "create_engine": fake_create_engine,
-        }
-        manager._loaded = True
-        
-        # Create engine
-        engine = manager.create_engine("fake", param="value")
-        
-        assert isinstance(engine, FakeEngine)
-        assert engine.kwargs == {"param": "value"}
-    
-    def test_plugin_manager_get_or_create_engine(self):
-        """PluginManager caches engines."""
-        manager = PluginManager()
-        
-        call_count = 0
-        
-        def fake_create_engine(**kwargs):
-            nonlocal call_count
-            call_count += 1
-            return FakeEngine(**kwargs)
-        
-        manager._plugins["fake"] = {
-            "manifest": MagicMock(),
-            "create_engine": fake_create_engine,
-        }
-        manager._loaded = True
-        
-        # Get engine twice
-        engine1 = manager.get_or_create_engine("fake")
-        engine2 = manager.get_or_create_engine("fake")
-        
-        # Should be same instance
-        assert engine1 is engine2
-        assert call_count == 1
-    
-    def test_plugin_manager_dispose_all(self):
-        """PluginManager disposes all cached engines."""
-        manager = PluginManager()
-        
-        def fake_create_engine(**kwargs):
-            return FakeEngine(**kwargs)
-        
-        manager._plugins["fake"] = {
-            "manifest": MagicMock(),
-            "create_engine": fake_create_engine,
-        }
-        manager._loaded = True
-        
-        # Create and cache engines
-        engine1 = manager.get_or_create_engine("fake")
-        engine2 = manager.get_or_create_engine("fake")
-        
-        # Dispose all
-        manager.dispose_all()
-        
-        # Engines should be disposed
-        assert engine1._disposed is True
-        assert engine2._disposed is True
-        
-        # Cache should be empty
-        assert len(manager._engines) == 0

tests/contracts/test_session_contract.py

@@ -1,135 +0,0 @@
-"""Contract tests for EngineSession protocol.
-
-These tests verify that EngineSession implementations satisfy the architectural requirements:
-- synthesize() returns SynthesizedAudio
-- dispose() is idempotent
-- After dispose(), synthesize() raises EngineError
-- Session remains usable after synthesize() failure
-"""
-
-import pytest
-
-from abogen.tts_plugin.engine import EngineSession
-from abogen.tts_plugin.errors import EngineError
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    Duration,
-    ParameterValues,
-    SynthesisRequest,
-    SynthesizedAudio,
-    VoiceSelection,
-)
-
-from .conftest import FakeEngineSession
-
-
-class TestEngineSessionProtocolContract:
-    """Contract tests for the EngineSession protocol itself."""
-
-    def test_engine_session_is_protocol(self) -> None:
-        assert hasattr(EngineSession, "__protocol_attrs__")
-
-    def test_fake_session_satisfies_protocol(self) -> None:
-        session = FakeEngineSession()
-        assert isinstance(session, EngineSession)
-
-
-class TestSessionSynthesizeContract:
-    """Contract tests for EngineSession.synthesize()."""
-
-    def test_synthesize_returns_synthesized_audio(self) -> None:
-        session = FakeEngineSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        result = session.synthesize(request)
-        assert isinstance(result, SynthesizedAudio)
-
-    def test_synthesize_returns_valid_audio_data(self) -> None:
-        session = FakeEngineSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        result = session.synthesize(request)
-        assert isinstance(result.data, bytes)
-        assert len(result.data) > 0
-        assert isinstance(result.format, AudioFormat)
-        assert isinstance(result.duration, Duration)
-
-
-class TestSessionDisposeContract:
-    """Contract tests for EngineSession.dispose()."""
-
-    def test_dispose_is_idempotent(self) -> None:
-        """Architecture spec: dispose() is idempotent."""
-        session = FakeEngineSession()
-        session.dispose()
-        session.dispose()  # Should not raise
-
-    def test_dispose_never_raises(self) -> None:
-        """Architecture spec: dispose() never raises exceptions."""
-        session = FakeEngineSession()
-        session.dispose()  # Should not raise
-
-
-class TestSessionAfterDisposeContract:
-    """Contract tests for behavior after dispose()."""
-
-    def test_synthesize_after_dispose_raises(self) -> None:
-        """Architecture spec: After dispose(), all methods except dispose() raise EngineError."""
-        session = FakeEngineSession()
-        session.dispose()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        with pytest.raises(EngineError):
-            session.synthesize(request)
-
-
-class TestSessionLifecycleContract:
-    """Contract tests for EngineSession lifecycle."""
-
-    def test_full_lifecycle(self) -> None:
-        """Test complete session lifecycle: create -> synthesize -> dispose."""
-        session = FakeEngineSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-
-        # Synthesize
-        result = session.synthesize(request)
-        assert isinstance(result, SynthesizedAudio)
-
-        # Dispose
-        session.dispose()
-
-    def test_multiple_synthesize_before_dispose(self) -> None:
-        """Architecture spec: Session remains usable after synthesize() failure."""
-        session = FakeEngineSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-
-        # Multiple synthesize calls
-        result1 = session.synthesize(request)
-        result2 = session.synthesize(request)
-        assert isinstance(result1, SynthesizedAudio)
-        assert isinstance(result2, SynthesizedAudio)
-
-        # Dispose
-        session.dispose()

tests/contracts/test_types_contract.py

@@ -1,244 +0,0 @@
-"""Contract tests for core domain value objects.
-
-These tests verify that value objects satisfy the architectural requirements:
-- Frozen (immutable) dataclasses
-- Correct field definitions
-- Proper equality behavior
-"""
-
-import pytest
-
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    Duration,
-    EngineConfig,
-    ParameterValues,
-    SynthesisRequest,
-    SynthesizedAudio,
-    VoiceSelection,
-)
-
-
-class TestAudioFormatContract:
-    """Contract tests for AudioFormat value object."""
-
-    def test_is_frozen_dataclass(self) -> None:
-        assert hasattr(AudioFormat, "__dataclass_params__")
-        assert AudioFormat.__dataclass_params__.frozen is True
-
-    def test_required_fields(self) -> None:
-        af = AudioFormat(mime="audio/wav", extension="wav")
-        assert af.mime == "audio/wav"
-        assert af.extension == "wav"
-
-    def test_immutability(self) -> None:
-        af = AudioFormat(mime="audio/wav", extension="wav")
-        with pytest.raises(AttributeError):
-            af.mime = "audio/mpeg"  # type: ignore[misc]
-
-    def test_equality(self) -> None:
-        af1 = AudioFormat(mime="audio/wav", extension="wav")
-        af2 = AudioFormat(mime="audio/wav", extension="wav")
-        assert af1 == af2
-
-    def test_inequality(self) -> None:
-        af1 = AudioFormat(mime="audio/wav", extension="wav")
-        af2 = AudioFormat(mime="audio/mpeg", extension="mp3")
-        assert af1 != af2
-
-    def test_hashable(self) -> None:
-        af = AudioFormat(mime="audio/wav", extension="wav")
-        assert hash(af) == hash(AudioFormat(mime="audio/wav", extension="wav"))
-
-
-class TestDurationContract:
-    """Contract tests for Duration value object."""
-
-    def test_is_frozen_dataclass(self) -> None:
-        assert hasattr(Duration, "__dataclass_params__")
-        assert Duration.__dataclass_params__.frozen is True
-
-    def test_required_fields(self) -> None:
-        d = Duration(seconds=1.5)
-        assert d.seconds == 1.5
-
-    def test_immutability(self) -> None:
-        d = Duration(seconds=1.0)
-        with pytest.raises(AttributeError):
-            d.seconds = 2.0  # type: ignore[misc]
-
-    def test_equality(self) -> None:
-        d1 = Duration(seconds=1.0)
-        d2 = Duration(seconds=1.0)
-        assert d1 == d2
-
-
-class TestVoiceSelectionContract:
-    """Contract tests for VoiceSelection value object."""
-
-    def test_is_frozen_dataclass(self) -> None:
-        assert hasattr(VoiceSelection, "__dataclass_params__")
-        assert VoiceSelection.__dataclass_params__.frozen is True
-
-    def test_required_fields(self) -> None:
-        vs = VoiceSelection(source="builtin", key="af_nova")
-        assert vs.source == "builtin"
-        assert vs.key == "af_nova"
-
-    def test_payload_default_none(self) -> None:
-        vs = VoiceSelection(source="builtin", key="af_nova")
-        assert vs.payload is None
-
-    def test_payload_optional(self) -> None:
-        vs = VoiceSelection(source="clone", key="my_voice", payload=b"audio_data")
-        assert vs.payload == b"audio_data"
-
-    def test_immutability(self) -> None:
-        vs = VoiceSelection(source="builtin", key="af_nova")
-        with pytest.raises(AttributeError):
-            vs.source = "other"  # type: ignore[misc]
-
-
-class TestParameterValuesContract:
-    """Contract tests for ParameterValues value object."""
-
-    def test_is_frozen_dataclass(self) -> None:
-        assert hasattr(ParameterValues, "__dataclass_params__")
-        assert ParameterValues.__dataclass_params__.frozen is True
-
-    def test_default_empty(self) -> None:
-        pv = ParameterValues()
-        assert pv.values == {}
-
-    def test_with_values(self) -> None:
-        pv = ParameterValues(values={"speed": 1.0, "pitch": 0.5})
-        assert pv.values["speed"] == 1.0
-        assert pv.values["pitch"] == 0.5
-
-    def test_immutability(self) -> None:
-        pv = ParameterValues(values={"speed": 1.0})
-        with pytest.raises(AttributeError):
-            pv.values = {}  # type: ignore[misc]
-
-
-class TestSynthesisRequestContract:
-    """Contract tests for SynthesisRequest value object."""
-
-    def test_is_frozen_dataclass(self) -> None:
-        assert hasattr(SynthesisRequest, "__dataclass_params__")
-        assert SynthesisRequest.__dataclass_params__.frozen is True
-
-    def test_required_fields(self) -> None:
-        req = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        assert req.text == "Hello"
-        assert req.voice.source == "builtin"
-        assert req.format.mime == "audio/wav"
-
-    def test_immutability(self) -> None:
-        req = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="af_nova"),
-            parameters=ParameterValues(),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        with pytest.raises(AttributeError):
-            req.text = "World"  # type: ignore[misc]
-
-
-class TestSynthesizedAudioContract:
-    """Contract tests for SynthesizedAudio value object."""
-
-    def test_is_frozen_dataclass(self) -> None:
-        assert hasattr(SynthesizedAudio, "__dataclass_params__")
-        assert SynthesizedAudio.__dataclass_params__.frozen is True
-
-    def test_required_fields(self) -> None:
-        audio = SynthesizedAudio(
-            data=b"\x00" * 100,
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-            duration=Duration(seconds=1.0),
-        )
-        assert audio.data == b"\x00" * 100
-        assert audio.format.mime == "audio/wav"
-        assert audio.duration.seconds == 1.0
-
-    def test_immutability(self) -> None:
-        audio = SynthesizedAudio(
-            data=b"\x00" * 100,
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-            duration=Duration(seconds=1.0),
-        )
-        with pytest.raises(AttributeError):
-            audio.data = b"\x00"  # type: ignore[misc]
-
-
-class TestEngineConfigContract:
-    """Contract tests for EngineConfig value object."""
-
-    def test_is_frozen_dataclass(self) -> None:
-        assert hasattr(EngineConfig, "__dataclass_params__")
-        assert EngineConfig.__dataclass_params__.frozen is True
-
-    def test_default_device(self) -> None:
-        config = EngineConfig()
-        assert config.device == "cpu"
-
-    def test_custom_device(self) -> None:
-        config = EngineConfig(device="cuda:0")
-        assert config.device == "cuda:0"
-
-    def test_default_lang_code(self) -> None:
-        config = EngineConfig()
-        assert config.lang_code == "a"
-
-    def test_custom_lang_code(self) -> None:
-        config = EngineConfig(lang_code="j")
-        assert config.lang_code == "j"
-
-    def test_immutability(self) -> None:
-        config = EngineConfig()
-        with pytest.raises(AttributeError):
-            config.device = "cuda:0"  # type: ignore[misc]
-
-    def test_immutability_lang_code(self) -> None:
-        config = EngineConfig()
-        with pytest.raises(AttributeError):
-            config.lang_code = "j"  # type: ignore[misc]
-
-    def test_unknown_keys_ignored_per_spec(self) -> None:
-        """Architecture spec: Unknown keys are ignored (no error).
-
-        EngineConfig is frozen, so unknown keys cannot be set after creation.
-        This test verifies the default behavior matches the spec.
-        """
-        config = EngineConfig()
-        assert config.device == "cpu"
-
-    def test_plugins_may_ignore_irrelevant_fields(self) -> None:
-        """Architecture Amendment #1: Plugins ignore unsupported fields.
-
-        EngineConfig may contain fields that are not relevant to every plugin.
-        Plugins MUST ignore fields they do not need, not raise on them.
-        """
-        config = EngineConfig(device="cuda:0", lang_code="j")
-        assert config.device == "cuda:0"
-        assert config.lang_code == "j"
-        # A plugin that only needs device simply reads config.device
-        # and ignores config.lang_code — this must not raise.
-
-    def test_engine_config_contains_engine_instance_configuration(self) -> None:
-        """Architecture Amendment #1: EngineConfig definition.
-
-        EngineConfig contains parameters that define how a particular
-        Engine instance is created and that remain constant throughout
-        the lifetime of that Engine.
-        """
-        config = EngineConfig(device="cpu", lang_code="a")
-        # Both fields are init-time, immutable, engine-scoped.
-        assert config.device == "cpu"
-        assert config.lang_code == "a"

tests/plugins/__init__.py

@@ -1,11 +0,0 @@
-"""Auto-discovery tests for TTS plugins.
-
-This package contains generic tests that automatically run for every plugin
-in the plugins/ directory. Tests verify:
-- Manifest structure
-- Engine creation and dispose contract
-- Capability implementation
-
-Plugin-specific tests remain in tests/test_<plugin>_plugin.py for
-integration with real dependencies (e.g., KPipeline for Kokoro).
-"""

tests/plugins/conftest.py

@@ -1,169 +0,0 @@
-"""Fixtures for auto-discovery plugin tests.
-
-This module provides shared fixtures for testing all plugins:
-- plugin_ids: List of all plugin IDs from plugins/ directory
-- plugin_dir: Path to a specific plugin directory (parametrized)
-- loaded_plugin: Loaded plugin data (manifest, model_requirements, create_engine)
-- host_context: Test HostContext with fake HTTP client
-"""
-
-from __future__ import annotations
-
-import logging
-from pathlib import Path
-from typing import Any
-
-import pytest
-
-from abogen.tts_plugin.host_context import HostContext
-from abogen.tts_plugin.loader import load_plugin_from_dir
-
-
-def _discover_plugin_ids() -> list[str]:
-    """Discover all plugin IDs from the plugins/ directory.
-    
-    Returns:
-        List of plugin IDs (directory names with __init__.py).
-    """
-    plugins_dir = Path(__file__).parent.parent.parent / "plugins"
-    plugin_ids = []
-    if plugins_dir.exists():
-        for item in sorted(plugins_dir.iterdir()):
-            if item.is_dir() and not item.name.startswith("."):
-                init_file = item / "__init__.py"
-                if init_file.exists():
-                    plugin_ids.append(item.name)
-    return plugin_ids
-
-
-@pytest.fixture(scope="module")
-def plugins_dir() -> Path:
-    """Return the path to the plugins directory."""
-    return Path(__file__).parent.parent.parent / "plugins"
-
-
-@pytest.fixture(scope="module")
-def plugin_ids(plugins_dir: Path) -> list[str]:
-    """Return a list of all plugin IDs from the plugins/ directory.
-    
-    This fixture discovers all subdirectories in plugins/ that contain
-    an __init__.py file (i.e., valid plugin directories).
-    
-    Returns:
-        List of plugin IDs (directory names).
-    """
-    return _discover_plugin_ids()
-
-
-@pytest.fixture(params=_discover_plugin_ids())
-def plugin_id(request: pytest.FixtureRequest) -> str:
-    """Parametrized fixture returning each plugin ID.
-    
-    This fixture is parametrized to run tests for each plugin.
-    """
-    return request.param
-
-
-@pytest.fixture
-def plugin_dir(plugins_dir: Path, plugin_id: str) -> Path:
-    """Return the path to a specific plugin directory.
-    
-    Args:
-        plugins_dir: Base plugins directory.
-        plugin_id: The plugin ID (directory name).
-        
-    Returns:
-        Path to the plugin directory.
-    """
-    return plugins_dir / plugin_id
-
-
-@pytest.fixture
-def loaded_plugin(plugin_dir: Path):
-    """Load a plugin and return its load result.
-    
-    This fixture loads the plugin using the loader, providing access to:
-    - manifest: PluginManifest
-    - model_requirements: tuple[ModelManifest, ...]
-    - create_engine: Callable
-    - module: The loaded module
-    
-    Args:
-        plugin_dir: Path to the plugin directory.
-        
-    Returns:
-        PluginLoadResult from load_plugin_from_dir.
-        
-    Raises:
-        pytest.skip: If plugin fails to load (should not happen for valid plugins).
-    """
-    from abogen.tts_plugin.loader import PluginLoadResult
-    
-    result = load_plugin_from_dir(plugin_dir)
-    if not result.success:
-        pytest.fail(
-            f"Plugin {plugin_dir.name} failed to load: "
-            f"{result.error.errors if result.error else 'Unknown error'}"
-        )
-    return result
-
-
-@pytest.fixture
-def host_context(tmp_path: Path) -> HostContext:
-    """Create a test HostContext with fake HTTP client.
-    
-    Args:
-        tmp_path: Pytest tmp_path fixture for config directory.
-        
-    Returns:
-        HostContext with fake HTTP client and test logger.
-    """
-    class FakeHttpClient:
-        """Fake HTTP client for testing."""
-        
-        def get(self, url: str, **kwargs: object) -> object:
-            """Fake GET request."""
-            return None
-        
-        def post(self, url: str, **kwargs: object) -> object:
-            """Fake POST request."""
-            return None
-    
-    return HostContext(
-        config_dir=tmp_path,
-        logger=logging.getLogger("test"),
-        http_client=FakeHttpClient(),
-    )
-
-
-@pytest.fixture
-def engine_config() -> Any:
-    """Return a default EngineConfig for testing.
-    
-    Returns:
-        EngineConfig with device="cpu" for testing.
-    """
-    from abogen.tts_plugin.types import EngineConfig
-    return EngineConfig(device="cpu")
-
-
-@pytest.fixture
-def create_engine(loaded_plugin, host_context, engine_config):
-    """Create an engine instance from a loaded plugin.
-    
-    This fixture creates an engine and ensures proper cleanup via dispose.
-    
-    Args:
-        loaded_plugin: Loaded plugin result.
-        host_context: Test HostContext.
-        engine_config: EngineConfig for engine creation.
-        
-    Yields:
-        Engine instance.
-    """
-    from abogen.tts_plugin.engine import Engine
-    
-    engine = loaded_plugin.create_engine(host_context, None, engine_config)
-    assert isinstance(engine, Engine)
-    yield engine
-    engine.dispose()

tests/plugins/fake_plugin/__init__.py

@@ -1,92 +0,0 @@
-"""Fake plugin for testing the plugin loader.
-
-This is a minimal valid plugin that satisfies the Plugin API contract.
-It does NOT perform any real TTS synthesis.
-"""
-
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.errors import EngineError
-from abogen.tts_plugin.host_context import HostContext
-from abogen.tts_plugin.manifest import (
-    AudioFormatManifest,
-    EngineManifest,
-    PluginManifest,
-    VoiceSourceManifest,
-)
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    Duration,
-    EngineConfig,
-    ParameterValues,
-    SynthesisRequest,
-    SynthesizedAudio,
-)
-
-
-class FakeSession:
-    """Minimal EngineSession implementation for testing."""
-
-    def __init__(self) -> None:
-        self._disposed = False
-
-    def synthesize(self, request: SynthesisRequest) -> SynthesizedAudio:
-        if self._disposed:
-            raise EngineError("Session disposed")
-        return SynthesizedAudio(
-            data=b"\x00" * 100,
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-            duration=Duration(seconds=1.0),
-        )
-
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-class FakeEngine:
-    """Minimal Engine implementation for testing."""
-
-    def __init__(self) -> None:
-        self._disposed = False
-
-    def createSession(self) -> EngineSession:
-        if self._disposed:
-            raise EngineError("Engine disposed")
-        return FakeSession()
-
-    def dispose(self) -> None:
-        self._disposed = True
-
-
-PLUGIN_MANIFEST = PluginManifest(
-    id="fake_plugin",
-    name="Fake Plugin",
-    version="1.0.0",
-    api_version="1.0",
-    description="A fake plugin for testing",
-    author="Test Author",
-    capabilities=(),
-    engine=EngineManifest(
-        voiceSources=(
-            VoiceSourceManifest(id="builtin", name="Builtin", type="list"),
-        ),
-        audioFormats=(
-            AudioFormatManifest(mime="audio/wav", extension="wav"),
-        ),
-    ),
-)
-
-MODEL_REQUIREMENTS: list[Any] = []
-
-
-def create_engine(
-    context: HostContext,
-    model_path: Path | None,
-    config: EngineConfig,
-) -> Engine:
-    """Create a fake engine instance."""
-    return FakeEngine()

tests/plugins/import_error/__init__.py

@@ -1,18 +0,0 @@
-"""Invalid plugin: raises ImportError during import."""
-
-from __future__ import annotations
-
-# This plugin intentionally raises an ImportError
-raise ImportError("Simulated import error for testing")
-
-# The following code will never be reached, but is here for documentation
-from abogen.tts_plugin.manifest import PluginManifest
-
-PLUGIN_MANIFEST = PluginManifest(
-    id="import_error",
-    name="Import Error Plugin",
-    version="1.0.0",
-    api_version="1.0",
-    description="Plugin that fails to import",
-    author="Test Author",
-)

tests/plugins/invalid_api_version/__init__.py

@@ -1,29 +0,0 @@
-"""Invalid plugin: incompatible api_version (major version mismatch)."""
-
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-from abogen.tts_plugin.manifest import PluginManifest
-from abogen.tts_plugin.types import EngineConfig
-
-# api_version "2.0" has major version 2, but host expects major version 1
-PLUGIN_MANIFEST = PluginManifest(
-    id="invalid_api_version",
-    name="Invalid API Version Plugin",
-    version="1.0.0",
-    api_version="2.0",  # Major version mismatch!
-    description="Plugin with incompatible api_version",
-    author="Test Author",
-)
-
-MODEL_REQUIREMENTS: list[Any] = []
-
-
-def create_engine(
-    context: Any,
-    model_path: Path | None,
-    config: EngineConfig,
-) -> Any:
-    raise NotImplementedError("This plugin is invalid")

tests/plugins/invalid_capabilities/__init__.py

@@ -1,29 +0,0 @@
-"""Invalid plugin: unknown capabilities."""
-
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-from abogen.tts_plugin.manifest import PluginManifest
-from abogen.tts_plugin.types import EngineConfig
-
-PLUGIN_MANIFEST = PluginManifest(
-    id="invalid_capabilities",
-    name="Invalid Capabilities Plugin",
-    version="1.0.0",
-    api_version="1.0",
-    description="Plugin with unknown capabilities",
-    author="Test Author",
-    capabilities=("voice_list", "unknown_capability", "another_unknown"),
-)
-
-MODEL_REQUIREMENTS: list[Any] = []
-
-
-def create_engine(
-    context: Any,
-    model_path: Path | None,
-    config: EngineConfig,
-) -> Any:
-    raise NotImplementedError("This plugin is invalid")

tests/plugins/missing_create_engine/__init__.py

@@ -1,18 +0,0 @@
-"""Invalid plugin: missing create_engine function."""
-
-from __future__ import annotations
-
-from abogen.tts_plugin.manifest import PluginManifest
-
-PLUGIN_MANIFEST = PluginManifest(
-    id="missing_create_engine",
-    name="Missing Create Engine Plugin",
-    version="1.0.0",
-    api_version="1.0",
-    description="Plugin missing create_engine",
-    author="Test Author",
-)
-
-MODEL_REQUIREMENTS: list = []
-
-# This plugin intentionally does NOT export create_engine

tests/plugins/missing_manifest/__init__.py

@@ -1,10 +0,0 @@
-"""Invalid plugin: missing PLUGIN_MANIFEST."""
-
-from __future__ import annotations
-
-# This plugin intentionally does NOT export PLUGIN_MANIFEST
-MODEL_REQUIREMENTS: list = []
-
-
-def create_engine(context, model_path, config):
-    raise NotImplementedError("This plugin is invalid")

tests/plugins/missing_model_requirements/__init__.py

@@ -1,28 +0,0 @@
-"""Invalid plugin: missing MODEL_REQUIREMENTS."""
-
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-from abogen.tts_plugin.manifest import PluginManifest
-from abogen.tts_plugin.types import EngineConfig
-
-PLUGIN_MANIFEST = PluginManifest(
-    id="missing_model_requirements",
-    name="Missing Model Requirements Plugin",
-    version="1.0.0",
-    api_version="1.0",
-    description="Plugin missing MODEL_REQUIREMENTS",
-    author="Test Author",
-)
-
-# This plugin intentionally does NOT export MODEL_REQUIREMENTS
-
-
-def create_engine(
-    context: Any,
-    model_path: Path | None,
-    config: EngineConfig,
-) -> Any:
-    raise NotImplementedError("This plugin is invalid")

tests/plugins/test_all_plugins.py

@@ -1,235 +0,0 @@
-"""Auto-discovery tests for all TTS plugins.
-
-These tests automatically run for every plugin in the plugins/ directory.
-Tests are grouped into three categories:
-
-1. TestAllPluginsManifest - Validates manifest structure
-   - Required fields (id, name, version, api_version, etc.)
-   - API version format (semver MAJOR.MINOR)
-   - Voices field (optional)
-
-2. TestAllPluginsEngine - Validates engine lifecycle
-   - create_engine returns valid Engine
-   - dispose is idempotent
-   - dispose → createSession raises EngineError
-
-3. TestAllPluginsCapabilities - Validates capability implementation
-   - Declared capabilities are implemented
-   - voice_list → VoiceLister interface
-"""
-
-from __future__ import annotations
-
-import re
-
-import pytest
-
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.errors import EngineError
-from abogen.tts_plugin.manifest import PluginManifest
-from abogen.tts_plugin.types import EngineConfig, VoiceSelection, AudioFormat, ParameterValues, SynthesisRequest
-
-
-class TestAllPluginsManifest:
-    """Test that all plugins have valid manifest structure."""
-
-    def test_manifest_has_required_fields(self, loaded_plugin):
-        """Verify manifest has all required fields."""
-        manifest = loaded_plugin.manifest
-        assert manifest is not None
-        
-        # Required fields
-        assert manifest.id, "Plugin id must not be empty"
-        assert manifest.name, "Plugin name must not be empty"
-        assert manifest.version, "Plugin version must not be empty"
-        assert manifest.api_version, "Plugin api_version must not be empty"
-        assert manifest.description, "Plugin description must not be empty"
-        assert manifest.author, "Plugin author must not be empty"
-
-    def test_manifest_id_matches_directory(self, loaded_plugin, plugin_dir):
-        """Verify manifest id matches the plugin directory name."""
-        manifest = loaded_plugin.manifest
-        assert manifest.id == plugin_dir.name, \
-            f"Manifest id '{manifest.id}' must match directory name '{plugin_dir.name}'"
-
-    def test_api_version_format(self, loaded_plugin):
-        """Verify api_version follows semver format (MAJOR.MINOR)."""
-        manifest = loaded_plugin.manifest
-        api_version = manifest.api_version
-        
-        # Must match MAJOR.MINOR format
-        pattern = r"^\d+\.\d+$"
-        assert re.match(pattern, api_version), \
-            f"api_version '{api_version}' must be in format MAJOR.MINOR (e.g., 1.0)"
-
-    def test_api_version_compatibility(self, loaded_plugin):
-        """Verify api_version major version matches host API version."""
-        from abogen.tts_plugin.loader import HOST_API_VERSION
-        
-        manifest = loaded_plugin.manifest
-        plugin_ver = manifest.api_version
-        host_ver = HOST_API_VERSION
-        
-        # Extract major versions
-        plugin_major = int(plugin_ver.split(".")[0])
-        host_major = int(host_ver.split(".")[0])
-        
-        assert plugin_major == host_major, \
-            f"API version major mismatch: plugin={plugin_major}, host={host_major}"
-
-    def test_voices_field_is_optional(self, loaded_plugin):
-        """Verify voices field is optional (can be None or tuple)."""
-        manifest = loaded_plugin.manifest
-        voices = manifest.voices
-        
-        # voices can be None (not declared) or tuple (empty or with voices)
-        assert voices is None or isinstance(voices, tuple), \
-            f"voices must be None or tuple, got {type(voices).__name__}"
-
-    def test_capabilities_is_tuple(self, loaded_plugin):
-        """Verify capabilities is a tuple."""
-        manifest = loaded_plugin.manifest
-        assert isinstance(manifest.capabilities, tuple), \
-            f"capabilities must be a tuple, got {type(manifest.capabilities).__name__}"
-
-    def test_engine_manifest_exists(self, loaded_plugin):
-        """Verify engine manifest exists and has required fields."""
-        manifest = loaded_plugin.manifest
-        engine_manifest = manifest.engine
-        
-        assert engine_manifest is not None
-        assert isinstance(engine_manifest.voiceSources, tuple)
-        assert isinstance(engine_manifest.parameters, tuple)
-        assert isinstance(engine_manifest.audioFormats, tuple)
-
-
-class TestAllPluginsEngine:
-    """Test that all plugins satisfy the Engine contract."""
-
-    def test_create_engine_returns_engine(self, loaded_plugin, host_context, engine_config):
-        """Verify create_engine returns an Engine instance."""
-        engine = loaded_plugin.create_engine(host_context, None, engine_config)
-        assert isinstance(engine, Engine), \
-            f"create_engine must return Engine instance, got {type(engine).__name__}"
-        engine.dispose()
-
-    def test_dispose_is_idempotent(self, loaded_plugin, host_context, engine_config):
-        """Verify dispose can be called multiple times without error."""
-        engine = loaded_plugin.create_engine(host_context, None, engine_config)
-        
-        # First dispose
-        engine.dispose()
-        
-        # Second dispose should not raise
-        engine.dispose()
-
-    def test_create_session_after_dispose_raises(self, loaded_plugin, host_context, engine_config):
-        """Verify createSession raises EngineError after dispose."""
-        engine = loaded_plugin.create_engine(host_context, None, engine_config)
-        engine.dispose()
-        
-        with pytest.raises(EngineError):
-            engine.createSession()
-
-    def test_dispose_after_dispose_raises(self, loaded_plugin, host_context, engine_config):
-        """Verify dispose after dispose does not raise (idempotent)."""
-        engine = loaded_plugin.create_engine(host_context, None, engine_config)
-        engine.dispose()
-        
-        # Should not raise
-        engine.dispose()
-
-    def test_create_session_returns_valid_session(self, loaded_plugin, host_context, engine_config):
-        """Verify createSession returns an EngineSession instance."""
-        engine = loaded_plugin.create_engine(host_context, None, engine_config)
-        session = engine.createSession()
-        
-        assert isinstance(session, EngineSession), \
-            f"createSession must return EngineSession instance, got {type(session).__name__}"
-        session.dispose()
-        engine.dispose()
-
-    def test_session_dispose_is_idempotent(self, loaded_plugin, host_context, engine_config):
-        """Verify session dispose can be called multiple times."""
-        engine = loaded_plugin.create_engine(host_context, None, engine_config)
-        session = engine.createSession()
-        
-        # First dispose
-        session.dispose()
-        
-        # Second dispose should not raise
-        session.dispose()
-        engine.dispose()
-
-    def test_session_synthesize_after_dispose_raises(self, loaded_plugin, host_context, engine_config):
-        """Verify session.synthesize raises EngineError after dispose."""
-        engine = loaded_plugin.create_engine(host_context, None, engine_config)
-        session = engine.createSession()
-        session.dispose()
-        
-        # Create a minimal request (won't actually synthesize, just test error)
-        request = SynthesisRequest(
-            text="test",
-            voice=VoiceSelection(source="test", key="test"),
-            parameters=ParameterValues(values={}),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        
-        with pytest.raises(EngineError):
-            session.synthesize(request)
-        engine.dispose()
-
-
-class TestAllPluginsCapabilities:
-    """Test that all plugins implement their declared capabilities."""
-
-    def test_voice_list_capability(self, loaded_plugin, host_context, engine_config):
-        """Verify plugins with 'voice_list' capability implement VoiceLister."""
-        manifest = loaded_plugin.manifest
-        
-        if "voice_list" not in manifest.capabilities:
-            pytest.skip("Plugin does not declare 'voice_list' capability")
-        
-        engine = loaded_plugin.create_engine(host_context, None, engine_config)
-        
-        # Check if listVoices method exists
-        assert hasattr(engine, "listVoices"), \
-            "Plugin with 'voice_list' capability must have listVoices method"
-        
-        # listVoices should be callable
-        assert callable(engine.listVoices), "listVoices must be callable"
-        
-        # listVoices should return a list/tuple of voices
-        # Get first voice source from manifest
-        if manifest.engine.voiceSources:
-            source_id = manifest.engine.voiceSources[0].id
-            voices = engine.listVoices(source_id)
-            
-            assert isinstance(voices, (list, tuple)), \
-                f"listVoices must return list or tuple, got {type(voices).__name__}"
-            
-            # Each voice should have id, name, tags
-            for voice in voices:
-                assert hasattr(voice, "id"), "Voice must have 'id' attribute"
-                assert hasattr(voice, "name"), "Voice must have 'name' attribute"
-                assert hasattr(voice, "tags"), "Voice must have 'tags' attribute"
-                assert isinstance(voice.tags, tuple), "Voice tags must be a tuple"
-        
-        engine.dispose()
-
-    def test_known_capabilities_are_valid(self, loaded_plugin):
-        """Verify all declared capabilities are known."""
-        manifest = loaded_plugin.manifest
-        
-        known_capabilities = frozenset({
-            "voice_list",
-            "preview",
-            "voice_clone",
-            "voice_blend",
-            "streaming",
-            "cancel",
-        })
-        
-        for cap in manifest.capabilities:
-            assert cap in known_capabilities, \
-                f"Unknown capability: '{cap}'. Known capabilities: {known_capabilities}"

tests/test_conversion_voice_resolution.py

@@ -1,7 +1,7 @@
 from types import SimpleNamespace
 from typing import cast
 
-from abogen.tts_plugin.utils import get_voices
+from abogen.constants import VOICES_INTERNAL
 from abogen.webui.conversion_runner import (
     _chapter_voice_spec,
     _chunk_voice_spec,
@@ -49,4 +49,4 @@ def test_voice_collection_includes_formula_components():
     voices = _collect_required_voice_ids(job)
 
     assert {"af_nova", "am_liam"}.issubset(voices)
-    assert voices.issuperset(get_voices("kokoro"))
+    assert voices.issuperset(VOICES_INTERNAL)

tests/test_epub_exporter.py

@@ -197,7 +197,7 @@ def test_epub3_preserves_original_whitespace(tmp_path) -> None:
     )
     assert match is not None
     original_text = html.unescape(match.group(1))
-    assert "Second line\n\nThird paragraph." in original_text.replace("\r\n", "\n")
+    assert "Second line\n\nThird paragraph." in original_text
 
 
 def test_epub3_sentence_chunks_render_as_paragraphs(tmp_path) -> None:

tests/test_kokoro_plugin.py

@@ -1,196 +0,0 @@
-"""Tests for the Kokoro TTS Plugin.
-
-These tests verify that the Kokoro plugin:
-- Loads correctly through the Plugin Loader
-- Has a valid manifest
-- Creates a valid Engine
-- Satisfies the Engine/EngineSession contract (via EngineContractMixin)
-- Implements VoiceLister capability
-"""
-
-from __future__ import annotations
-
-import logging
-from pathlib import Path
-from typing import Any
-
-import pytest
-
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.host_context import HostContext
-from abogen.tts_plugin.loader import load_plugin_from_dir
-from abogen.tts_plugin.manifest import PluginManifest
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    EngineConfig,
-    ParameterValues,
-    SynthesisRequest,
-    VoiceSelection,
-)
-
-from tests.contracts.engine_contract import EngineContractMixin
-
-
-# ──────────────────────────────────────────────────────────────
-# Helpers
-# ──────────────────────────────────────────────────────────────
-
-def _kokoro_available() -> bool:
-    try:
-        from kokoro import KPipeline  # type: ignore[import-not-found]
-        return True
-    except ImportError:
-        return False
-
-
-def _make_mock_engine() -> Any:
-    from plugins.kokoro.engine import KokoroEngine
-
-    class MockPipeline:
-        def __call__(self, text, voice, speed, split_pattern=None):
-            class MockSegment:
-                def __init__(self):
-                    self.audio = MockAudio()
-            class MockAudio:
-                def numpy(self):
-                    import numpy as np
-                    return np.zeros(24000, dtype="float32")
-            return [MockSegment()]
-
-    engine = KokoroEngine(MockPipeline())
-
-    # Override listVoices for testing (real engine reads from manifest)
-    from abogen.tts_plugin.manifest import VoiceManifest
-    engine.listVoices = lambda source_id: [
-        VoiceManifest(id="test_voice_1", name="Test Voice 1", tags=("en",)),
-        VoiceManifest(id="test_voice_2", name="Test Voice 2", tags=("es",)),
-    ]
-    return engine
-
-
-# ──────────────────────────────────────────────────────────────
-# Fixtures
-# ──────────────────────────────────────────────────────────────
-
-@pytest.fixture
-def kokoro_plugin_dir() -> Path:
-    return Path(__file__).parent.parent / "plugins" / "kokoro"
-
-
-@pytest.fixture
-def host_context(tmp_path: Path) -> HostContext:
-    class FakeHttpClient:
-        def get(self, url: str, **kwargs: object) -> object:
-            return None
-        def post(self, url: str, **kwargs: object) -> object:
-            return None
-
-    return HostContext(
-        config_dir=tmp_path,
-        logger=logging.getLogger("test"),
-        http_client=FakeHttpClient(),
-    )
-
-
-@pytest.fixture
-def engine() -> Engine:
-    return _make_mock_engine()
-
-
-# ──────────────────────────────────────────────────────────────
-# Plugin Loading Tests
-# ──────────────────────────────────────────────────────────────
-
-class TestKokoroPluginLoading:
-
-    def test_plugin_loads_successfully(self, kokoro_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(kokoro_plugin_dir)
-        assert result.success is True
-        assert result.manifest is not None
-        assert result.create_engine is not None
-
-    def test_plugin_has_valid_manifest(self, kokoro_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(kokoro_plugin_dir)
-        assert result.success is True
-        manifest = result.manifest
-        assert isinstance(manifest, PluginManifest)
-        assert manifest.id == "kokoro"
-        assert manifest.name == "Kokoro"
-        assert manifest.api_version == "1.0"
-
-    def test_plugin_has_model_requirements(self, kokoro_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(kokoro_plugin_dir)
-        assert result.success is True
-        assert result.model_requirements is not None
-        assert isinstance(result.model_requirements, tuple)
-
-    def test_plugin_manifest_capabilities(self, kokoro_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(kokoro_plugin_dir)
-        assert result.success is True
-        assert "voice_list" in result.manifest.capabilities
-
-    def test_plugin_manifest_engine(self, kokoro_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(kokoro_plugin_dir)
-        assert result.success is True
-        engine_manifest = result.manifest.engine
-        assert len(engine_manifest.voiceSources) > 0
-        assert len(engine_manifest.audioFormats) > 0
-        assert len(engine_manifest.parameters) > 0
-
-
-# ──────────────────────────────────────────────────────────────
-# Engine Creation (real backend, skipped if not installed)
-# ──────────────────────────────────────────────────────────────
-
-class TestKokoroEngineCreation:
-
-    @pytest.mark.skipif(not _kokoro_available(), reason="Kokoro not installed")
-    def test_create_engine(self, kokoro_plugin_dir: Path, host_context: HostContext) -> None:
-        result = load_plugin_from_dir(kokoro_plugin_dir)
-        assert result.success is True
-        engine = result.create_engine(host_context, None, EngineConfig())
-        assert isinstance(engine, Engine)
-        engine.dispose()
-
-    @pytest.mark.skipif(not _kokoro_available(), reason="Kokoro not installed")
-    def test_engine_satisfies_protocol(self, kokoro_plugin_dir: Path, host_context: HostContext) -> None:
-        result = load_plugin_from_dir(kokoro_plugin_dir)
-        assert result.success is True
-        engine = result.create_engine(host_context, None, EngineConfig())
-        assert isinstance(engine, Engine)
-        engine.dispose()
-
-
-# ──────────────────────────────────────────────────────────────
-# Engine / Session Contract (inherited from base)
-# ──────────────────────────────────────────────────────────────
-
-class TestKokoroEngineContract(EngineContractMixin):
-    """Every test from EngineContractMixin runs against KokoroEngine."""
-
-    @pytest.fixture
-    def default_voice(self) -> str:
-        return "af_nova"
-
-
-# ──────────────────────────────────────────────────────────────
-# VoiceLister Tests
-# ──────────────────────────────────────────────────────────────
-
-class TestKokoroVoiceLister:
-
-    def test_list_voices(self) -> None:
-        engine = _make_mock_engine()
-        voices = engine.listVoices("builtin")
-        assert len(voices) > 0
-        assert all(hasattr(v, "id") for v in voices)
-        assert all(hasattr(v, "name") for v in voices)
-        engine.dispose()
-
-    def test_voices_have_tags(self) -> None:
-        engine = _make_mock_engine()
-        voices = engine.listVoices("builtin")
-        for voice in voices:
-            assert isinstance(voice.tags, tuple)
-            assert len(voice.tags) > 0
-        engine.dispose()

tests/test_preview_applies_manual_overrides.py

@@ -19,7 +19,7 @@ def test_preview_applies_manual_override_before_normalization(monkeypatch):
 
     # And stub the kokoro pipeline path so generate_preview_audio won't proceed.
     # We'll instead validate by calling the override logic through generate_preview_audio
-    # with provider=supertonic and stub create_backend to capture input.
+    # with provider=supertonic and stub SupertonicPipeline to capture input.
     captured = {}
 
     class DummyPipeline:
@@ -30,16 +30,11 @@ def test_preview_applies_manual_override_before_normalization(monkeypatch):
             captured["text"] = text
             return iter(())
 
-    from abogen.tts_plugin import utils
+    monkeypatch.setitem(
-
+        __import__("sys").modules,
-    original_create_pipeline = utils.create_pipeline
+        "abogen.tts_supertonic",
-
+        type("M", (), {"SupertonicPipeline": DummyPipeline}),
-    def _mock_create_pipeline(backend_id, **kwargs):
+    )
-        if backend_id == "supertonic":
-            return DummyPipeline(**kwargs)
-        return original_create_pipeline(backend_id, **kwargs)
-
-    monkeypatch.setattr(utils, "create_pipeline", _mock_create_pipeline)
 
     try:
         preview.generate_preview_audio(

tests/test_supertonic_plugin.py

@@ -1,281 +0,0 @@
-"""Tests for the SuperTonic TTS Plugin.
-
-These tests verify that the SuperTonic plugin:
-- Loads correctly through the Plugin Loader
-- Has a valid manifest
-- Creates a valid Engine
-- Satisfies the Engine/EngineSession contract (via EngineContractMixin)
-- Implements VoiceLister capability
-"""
-
-from __future__ import annotations
-
-import logging
-from pathlib import Path
-from typing import Any
-
-import pytest
-
-from abogen.tts_plugin.engine import Engine, EngineSession
-from abogen.tts_plugin.host_context import HostContext
-from abogen.tts_plugin.loader import load_plugin_from_dir
-from abogen.tts_plugin.manifest import PluginManifest
-from abogen.tts_plugin.types import (
-    AudioFormat,
-    EngineConfig,
-    ParameterValues,
-    SynthesisRequest,
-    VoiceSelection,
-)
-
-from tests.contracts.engine_contract import EngineContractMixin
-
-
-# ──────────────────────────────────────────────────────────────
-# Helpers
-# ──────────────────────────────────────────────────────────────
-
-def _supertonic_available() -> bool:
-    try:
-        from supertonic import TTS  # type: ignore[import-not-found]
-        return True
-    except ImportError:
-        return False
-
-
-def _make_mock_engine() -> Any:
-    from plugins.supertonic.engine import SuperTonicEngine
-
-    class MockSegment:
-        def __init__(self):
-            import numpy as np
-            self.audio = np.zeros(24000, dtype="float32")
-
-    class MockPipeline:
-        sample_rate = 24000
-
-        def __call__(self, text, voice, speed, split_pattern=None, total_steps=None):
-            return [MockSegment()]
-
-    engine = SuperTonicEngine(MockPipeline())
-
-    # Override listVoices for testing (real engine reads from manifest)
-    from abogen.tts_plugin.manifest import VoiceManifest
-    original_list_voices = engine.listVoices
-    
-    def mock_list_voices(source_id):
-        if engine._disposed:
-            from abogen.tts_plugin.errors import EngineError
-            raise EngineError("Engine disposed")
-        return [
-            VoiceManifest(id="M1", name="Male 1", tags=("male",)),
-            VoiceManifest(id="M2", name="Male 2", tags=("male",)),
-            VoiceManifest(id="M3", name="Male 3", tags=("male",)),
-            VoiceManifest(id="M4", name="Male 4", tags=("male",)),
-            VoiceManifest(id="M5", name="Male 5", tags=("male",)),
-            VoiceManifest(id="F1", name="Female 1", tags=("female",)),
-            VoiceManifest(id="F2", name="Female 2", tags=("female",)),
-            VoiceManifest(id="F3", name="Female 3", tags=("female",)),
-            VoiceManifest(id="F4", name="Female 4", tags=("female",)),
-            VoiceManifest(id="F5", name="Female 5", tags=("female",)),
-        ]
-    
-    engine.listVoices = mock_list_voices
-    return engine
-
-
-# ──────────────────────────────────────────────────────────────
-# Fixtures
-# ──────────────────────────────────────────────────────────────
-
-@pytest.fixture
-def supertonic_plugin_dir() -> Path:
-    return Path(__file__).parent.parent / "plugins" / "supertonic"
-
-
-@pytest.fixture
-def host_context(tmp_path: Path) -> HostContext:
-    class FakeHttpClient:
-        def get(self, url: str, **kwargs: object) -> object:
-            return None
-        def post(self, url: str, **kwargs: object) -> object:
-            return None
-
-    return HostContext(
-        config_dir=tmp_path,
-        logger=logging.getLogger("test"),
-        http_client=FakeHttpClient(),
-    )
-
-
-@pytest.fixture
-def engine() -> Engine:
-    return _make_mock_engine()
-
-
-# ──────────────────────────────────────────────────────────────
-# Plugin Loading Tests
-# ──────────────────────────────────────────────────────────────
-
-class TestSuperTonicPluginLoading:
-
-    def test_plugin_loads_successfully(self, supertonic_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(supertonic_plugin_dir)
-        assert result.success is True
-        assert result.manifest is not None
-        assert result.create_engine is not None
-
-    def test_plugin_has_valid_manifest(self, supertonic_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(supertonic_plugin_dir)
-        assert result.success is True
-        manifest = result.manifest
-        assert isinstance(manifest, PluginManifest)
-        assert manifest.id == "supertonic"
-        assert manifest.name == "SuperTonic"
-        assert manifest.api_version == "1.0"
-
-    def test_plugin_has_model_requirements(self, supertonic_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(supertonic_plugin_dir)
-        assert result.success is True
-        assert result.model_requirements is not None
-        assert isinstance(result.model_requirements, tuple)
-
-    def test_plugin_manifest_capabilities(self, supertonic_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(supertonic_plugin_dir)
-        assert result.success is True
-        assert "voice_list" in result.manifest.capabilities
-
-    def test_plugin_manifest_engine(self, supertonic_plugin_dir: Path) -> None:
-        result = load_plugin_from_dir(supertonic_plugin_dir)
-        assert result.success is True
-        engine_manifest = result.manifest.engine
-        assert len(engine_manifest.voiceSources) > 0
-        assert len(engine_manifest.audioFormats) > 0
-        assert len(engine_manifest.parameters) > 0
-
-
-# ──────────────────────────────────────────────────────────────
-# Engine Creation (real backend, skipped if not installed)
-# ──────────────────────────────────────────────────────────────
-
-class TestSuperTonicEngineCreation:
-
-    @pytest.mark.skipif(not _supertonic_available(), reason="SuperTonic not installed")
-    def test_create_engine(self, supertonic_plugin_dir: Path, host_context: HostContext) -> None:
-        result = load_plugin_from_dir(supertonic_plugin_dir)
-        assert result.success is True
-        engine = result.create_engine(host_context, None, EngineConfig())
-        assert isinstance(engine, Engine)
-        engine.dispose()
-
-    @pytest.mark.skipif(not _supertonic_available(), reason="SuperTonic not installed")
-    def test_engine_satisfies_protocol(self, supertonic_plugin_dir: Path, host_context: HostContext) -> None:
-        result = load_plugin_from_dir(supertonic_plugin_dir)
-        assert result.success is True
-        engine = result.create_engine(host_context, None, EngineConfig())
-        assert isinstance(engine, Engine)
-        engine.dispose()
-
-
-# ──────────────────────────────────────────────────────────────
-# Engine / Session Contract (inherited from base)
-# ──────────────────────────────────────────────────────────────
-
-class TestSuperTonicEngineContract(EngineContractMixin):
-    """Every test from EngineContractMixin runs against SuperTonicEngine."""
-
-    @pytest.fixture
-    def default_voice(self) -> str:
-        return "M1"
-
-
-# ──────────────────────────────────────────────────────────────
-# VoiceLister Tests
-# ──────────────────────────────────────────────────────────────
-
-class TestSuperTonicVoiceLister:
-
-    def test_list_voices(self) -> None:
-        engine = _make_mock_engine()
-        voices = engine.listVoices("builtin")
-        assert len(voices) == 10
-        assert all(hasattr(v, "id") for v in voices)
-        assert all(hasattr(v, "name") for v in voices)
-        engine.dispose()
-
-    def test_voices_have_tags(self) -> None:
-        engine = _make_mock_engine()
-        for voice in engine.listVoices("builtin"):
-            assert isinstance(voice.tags, tuple)
-            assert len(voice.tags) > 0
-        engine.dispose()
-
-    def test_male_voices_have_male_tag(self) -> None:
-        engine = _make_mock_engine()
-        for v in engine.listVoices("builtin"):
-            if v.id.startswith("M"):
-                assert "male" in v.tags
-        engine.dispose()
-
-    def test_female_voices_have_female_tag(self) -> None:
-        engine = _make_mock_engine()
-        for v in engine.listVoices("builtin"):
-            if v.id.startswith("F"):
-                assert "female" in v.tags
-        engine.dispose()
-
-    def test_list_voices_after_dispose_raises(self) -> None:
-        from abogen.tts_plugin.errors import EngineError
-        engine = _make_mock_engine()
-        engine.dispose()
-        with pytest.raises(EngineError):
-            engine.listVoices("builtin")
-
-
-# ──────────────────────────────────────────────────────────────
-# SuperTonic-specific parameter tests
-# ──────────────────────────────────────────────────────────────
-
-class TestSuperTonicParameters:
-
-    def test_speed_parameter(self) -> None:
-        engine = _make_mock_engine()
-        session = engine.createSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="M1"),
-            parameters=ParameterValues(values={"speed": 1.5}),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        result = session.synthesize(request)
-        assert isinstance(result.data, bytes)
-        session.dispose()
-        engine.dispose()
-
-    def test_total_steps_parameter(self) -> None:
-        engine = _make_mock_engine()
-        session = engine.createSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="M1"),
-            parameters=ParameterValues(values={"total_steps": 10}),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        result = session.synthesize(request)
-        assert isinstance(result.data, bytes)
-        session.dispose()
-        engine.dispose()
-
-    def test_default_parameters(self) -> None:
-        engine = _make_mock_engine()
-        session = engine.createSession()
-        request = SynthesisRequest(
-            text="Hello",
-            voice=VoiceSelection(source="builtin", key="M1"),
-            parameters=ParameterValues(values={}),
-            format=AudioFormat(mime="audio/wav", extension="wav"),
-        )
-        result = session.synthesize(request)
-        assert isinstance(result.data, bytes)
-        session.dispose()
-        engine.dispose()

tests/test_tts_supertonic_unsupported_chars.py

@@ -0,0 +1,53 @@
+import numpy as np
+
+from abogen.tts_supertonic import SupertonicPipeline
+
+
+class _DummyTTS:
+    def get_voice_style(self, voice_name: str):
+        return {"voice": voice_name}
+
+    def synthesize(
+        self,
+        *,
+        text: str,
+        voice_style,
+        total_steps: int,
+        speed: float,
+        max_chunk_length: int,
+        silence_duration: float,
+        verbose: bool,
+    ):
+        if "•" in text:
+            raise ValueError("Found 1 unsupported character(s): ['•']")
+        # Return 50ms of audio at 24kHz.
+        sr = 24000
+        audio = np.zeros(int(0.05 * sr), dtype="float32")
+        return audio, 0.05
+
+
+def test_supertonic_pipeline_strips_unsupported_characters_and_retries():
+    # Avoid importing/initializing real supertonic by manually constructing the pipeline.
+    pipeline = SupertonicPipeline.__new__(SupertonicPipeline)
+    pipeline.sample_rate = 24000
+    pipeline.total_steps = 5
+    pipeline.max_chunk_length = 1000
+    pipeline._tts = _DummyTTS()
+
+    segs = list(pipeline("Hello • world", voice="M1", speed=1.0))
+    assert len(segs) == 1
+    assert segs[0].graphemes == "Hello  world" or segs[0].graphemes == "Hello world"
+    assert isinstance(segs[0].audio, np.ndarray)
+    assert segs[0].audio.dtype == np.float32
+    assert segs[0].audio.size > 0
+
+
+def test_supertonic_pipeline_drops_chunk_if_only_unsupported_characters():
+    pipeline = SupertonicPipeline.__new__(SupertonicPipeline)
+    pipeline.sample_rate = 24000
+    pipeline.total_steps = 5
+    pipeline.max_chunk_length = 1000
+    pipeline._tts = _DummyTTS()
+
+    segs = list(pipeline("•", voice="M1", speed=1.0))
+    assert segs == []

tests/test_voice_cache.py

@@ -3,7 +3,7 @@ from typing import cast
 
 import pytest
 
-from abogen.tts_plugin.utils import get_voices
+from abogen.constants import VOICES_INTERNAL
 from abogen.voice_cache import (
     LocalEntryNotFoundError,
     _CACHED_VOICES,
@@ -66,4 +66,4 @@ def test_collect_required_voice_ids_includes_all():
     voices = _collect_required_voice_ids(cast(Job, job))
 
     assert {"af_nova", "am_liam", "am_michael"}.issubset(voices)
-    assert voices.issuperset(get_voices("kokoro"))
+    assert voices.issuperset(VOICES_INTERNAL)

tests/test_voice_formula_resolution.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+from abogen.webui.conversion_runner import _resolve_voice, _supertonic_voice_from_spec
+from abogen.tts_supertonic import DEFAULT_SUPERTONIC_VOICES
+
+
+def test_resolve_voice_formula_without_pipeline_does_not_crash() -> None:
+    # This can happen when a previously-saved Kokoro mix formula is present
+    # but the active provider is SuperTonic (no Kokoro pipeline object).
+    formula = "af_heart*0.5+af_sky*0.5"
+    resolved = _resolve_voice(None, formula, use_gpu=False)
+    assert resolved == formula
+
+
+def test_supertonic_voice_from_formula_falls_back_to_valid_voice() -> None:
+    # When a stale Kokoro mix formula is present, SuperTonic should not receive it.
+    chosen = _supertonic_voice_from_spec("af_heart*0.5+af_sky*0.5", "af_heart*1.0")
+    assert chosen in DEFAULT_SUPERTONIC_VOICES

tests/test_voice_metadata.py

@@ -1,233 +0,0 @@
-import pytest
-
-from abogen.voice_metadata import VoiceMetadata
-
-
-class TestVoiceMetadataCreation:
-    def test_create_with_all_fields(self):
-        voice = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        assert voice.id == "af_alloy"
-        assert voice.display_name == "Alloy"
-        assert voice.language == "a"
-        assert voice.gender == "female"
-        assert voice.backend_id == "kokoro"
-
-    def test_create_supertonic_voice(self):
-        voice = VoiceMetadata(
-            id="M1",
-            display_name="Male 1",
-            language="en",
-            gender="male",
-            backend_id="supertonic",
-        )
-        assert voice.id == "M1"
-        assert voice.backend_id == "supertonic"
-
-    def test_create_with_unknown_gender(self):
-        voice = VoiceMetadata(
-            id="custom_voice",
-            display_name="Custom",
-            language="en",
-            gender="unknown",
-            backend_id="custom_backend",
-        )
-        assert voice.gender == "unknown"
-
-
-class TestVoiceMetadataImmutability:
-    def test_frozen_dataclass(self):
-        voice = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        with pytest.raises(AttributeError):
-            voice.id = "new_id"
-
-    def test_cannot_modify_display_name(self):
-        voice = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        with pytest.raises(AttributeError):
-            voice.display_name = "New Name"
-
-    def test_cannot_modify_backend_id(self):
-        voice = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        with pytest.raises(AttributeError):
-            voice.backend_id = "new_backend"
-
-
-class TestVoiceMetadataEquality:
-    def test_equal_voices_are_equal(self):
-        voice1 = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        voice2 = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        assert voice1 == voice2
-
-    def test_different_voices_are_not_equal(self):
-        voice1 = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        voice2 = VoiceMetadata(
-            id="am_adam",
-            display_name="Adam",
-            language="a",
-            gender="male",
-            backend_id="kokoro",
-        )
-        assert voice1 != voice2
-
-    def test_different_backend_id_not_equal(self):
-        voice1 = VoiceMetadata(
-            id="custom",
-            display_name="Custom",
-            language="en",
-            gender="unknown",
-            backend_id="backend_a",
-        )
-        voice2 = VoiceMetadata(
-            id="custom",
-            display_name="Custom",
-            language="en",
-            gender="unknown",
-            backend_id="backend_b",
-        )
-        assert voice1 != voice2
-
-
-class TestVoiceMetadataHashing:
-    def test_hashable(self):
-        voice = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        assert hash(voice) is not None
-
-    def test_equal_voices_same_hash(self):
-        voice1 = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        voice2 = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        assert hash(voice1) == hash(voice2)
-
-    def test_usable_in_set(self):
-        voice1 = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        voice2 = VoiceMetadata(
-            id="af_alloy",
-            display_name="Alloy",
-            language="a",
-            gender="female",
-            backend_id="kokoro",
-        )
-        voice3 = VoiceMetadata(
-            id="am_adam",
-            display_name="Adam",
-            language="a",
-            gender="male",
-            backend_id="kokoro",
-        )
-        voice_set = {voice1, voice2, voice3}
-        assert len(voice_set) == 2
-
-
-class TestVoiceMetadataUseCases:
-    def test_backend_populates_backend_id(self):
-        """Simulate how a backend would populate backend_id automatically."""
-
-        class MockBackend:
-            def __init__(self):
-                self._backend_id = "kokoro"
-
-            def get_voices(self):
-                return [
-                    VoiceMetadata(
-                        id="af_alloy",
-                        display_name="Alloy",
-                        language="a",
-                        gender="female",
-                        backend_id=self._backend_id,
-                    ),
-                ]
-
-        backend = MockBackend()
-        voices = backend.get_voices()
-        assert voices[0].backend_id == "kokoro"
-
-    def test_filter_by_language(self):
-        voices = [
-            VoiceMetadata(id="af_alloy", display_name="Alloy", language="a", gender="female", backend_id="kokoro"),
-            VoiceMetadata(id="jf_alpha", display_name="Alpha", language="j", gender="female", backend_id="kokoro"),
-            VoiceMetadata(id="am_adam", display_name="Adam", language="a", gender="male", backend_id="kokoro"),
-        ]
-        english_voices = [v for v in voices if v.language == "a"]
-        assert len(english_voices) == 2
-
-    def test_filter_by_gender(self):
-        voices = [
-            VoiceMetadata(id="af_alloy", display_name="Alloy", language="a", gender="female", backend_id="kokoro"),
-            VoiceMetadata(id="am_adam", display_name="Adam", language="a", gender="male", backend_id="kokoro"),
-            VoiceMetadata(id="am_puck", display_name="Puck", language="a", gender="male", backend_id="kokoro"),
-        ]
-        male_voices = [v for v in voices if v.gender == "male"]
-        assert len(male_voices) == 2
-
-    def test_filter_by_backend(self):
-        voices = [
-            VoiceMetadata(id="af_alloy", display_name="Alloy", language="a", gender="female", backend_id="kokoro"),
-            VoiceMetadata(id="M1", display_name="Male 1", language="en", gender="male", backend_id="supertonic"),
-        ]
-        kokoro_voices = [v for v in voices if v.backend_id == "kokoro"]
-        assert len(kokoro_voices) == 1
-        assert kokoro_voices[0].id == "af_alloy"