"""Tests for domain/conversion_pipeline.py — emit_text_segments."""

from dataclasses import dataclass, field
from typing import Any, List, Optional
from unittest.mock import MagicMock

import numpy as np
import pytest

from abogen.domain.conversion_pipeline import emit_text_segments, SegmentResult


@dataclass
class FakeSegment:
    graphemes: str
    audio: Any
    tokens: list = field(default_factory=list)


@dataclass
class FakeTokenObj:
    text: str
    start_ts: float
    end_ts: float
    whitespace: str = ""


def make_backend(segments):
    """Create a mock TTS backend that yields FakeSegments."""
    def backend(text, voice=None, speed=1.0, split_pattern=None):
        for seg in segments:
            yield seg
    return backend


class TestEmitTextSegments:
    def test_yields_segments(self):
        audio = np.ones(24000, dtype="float32")
        segments = [FakeSegment("Hello", audio)]
        results = list(emit_text_segments(
            "Hello world",
            backend=make_backend(segments),
            voice="A",
            speed=1.0,
            split_pattern=r"\s+",
        ))
        assert len(results) == 1
        assert results[0].graphemes == "Hello"
        assert results[0].duration == 1.0

    def test_skips_empty_audio(self):
        segments = [
            FakeSegment("Hello", np.ones(24000, dtype="float32")),
            FakeSegment("", np.array([], dtype="float32")),
            FakeSegment("World", np.ones(12000, dtype="float32")),
        ]
        results = list(emit_text_segments(
            "test",
            backend=make_backend(segments),
            voice="A",
            speed=1.0,
            split_pattern=r"\s+",
        ))
        assert len(results) == 2
        assert results[0].graphemes == "Hello"
        assert results[1].graphemes == "World"

    def test_chunk_start_increments(self):
        audio = np.ones(24000, dtype="float32")
        segments = [FakeSegment("A", audio), FakeSegment("B", audio)]
        results = list(emit_text_segments(
            "test",
            backend=make_backend(segments),
            voice="A",
            speed=1.0,
            split_pattern=r"\s+",
            current_time=5.0,
        ))
        assert results[0].chunk_start == 5.0
        assert results[1].chunk_start == 6.0

    def test_tokens_extracted(self):
        token = FakeTokenObj("Hello", 0.0, 0.5, " ")
        audio = np.ones(24000, dtype="float32")
        segments = [FakeSegment("Hello", audio, [token])]
        results = list(emit_text_segments(
            "test",
            backend=make_backend(segments),
            voice="A",
            speed=1.0,
            split_pattern=r"\s+",
            current_time=2.0,
        ))
        assert len(results[0].tokens) == 1
        assert results[0].tokens[0]["start"] == 2.0
        assert results[0].tokens[0]["end"] == 2.5
        assert results[0].tokens[0]["text"] == "Hello"

    def test_fake_token_fallback(self):
        """When no tokens provided, creates a single FakeToken for the segment."""
        audio = np.ones(24000, dtype="float32")
        segments = [FakeSegment("Hello", audio)]  # No tokens
        results = list(emit_text_segments(
            "test",
            backend=make_backend(segments),
            voice="A",
            speed=1.0,
            split_pattern=r"\s+",
        ))
        assert len(results[0].tokens) == 1
        assert results[0].tokens[0]["text"] == "Hello"

    def test_empty_text(self):
        results = list(emit_text_segments(
            "",
            backend=make_backend([]),
            voice="A",
            speed=1.0,
            split_pattern=r"\s+",
        ))
        assert len(results) == 0

    def test_segment_result_fields(self):
        audio = np.ones(48000, dtype="float32")
        segments = [FakeSegment("Test", audio)]
        results = list(emit_text_segments(
            "test",
            backend=make_backend(segments),
            voice="A",
            speed=1.0,
            split_pattern=r"\s+",
        ))
        seg = results[0]
        assert isinstance(seg, SegmentResult)
        assert seg.graphemes == "Test"
        assert seg.duration == 2.0
        assert len(seg.audio) == 48000