from __future__ import annotations

import atexit
import logging
import os
from pathlib import Path
from typing import Any, Optional

from flask import Flask

from abogen.utils import get_user_cache_path, get_user_output_path, get_user_settings_dir

from .conversion_runner import run_conversion_job
from .service import build_service


class _SuppressSuccessfulAccessFilter(logging.Filter):
    """Filter out successful (HTTP 200) werkzeug access logs."""

    def filter(self, record: logging.LogRecord) -> bool:  # pragma: no cover - small utility
        try:
            message = record.getMessage()
        except Exception:  # pragma: no cover - defensive
            return True
        # Werkzeug access logs include the status code near the end, e.g.
        # "GET /path HTTP/1.1" 200 -
        # Treat any 2xx response as success to suppress.
        return " 200 " not in message and " 201 " not in message and " 204 " not in message


_access_log_filter_attached = False


def _default_dirs() -> tuple[Path, Path]:
    uploads_override = os.environ.get("ABOGEN_UPLOAD_ROOT")
    outputs_override = os.environ.get("ABOGEN_OUTPUT_ROOT")

    if uploads_override:
        uploads = Path(os.path.expanduser(uploads_override)).resolve()
    else:
        uploads = Path(get_user_cache_path("web/uploads"))

    if outputs_override:
        outputs = Path(os.path.expanduser(outputs_override)).resolve()
    else:
        outputs = Path(get_user_output_path("web"))

    uploads.mkdir(parents=True, exist_ok=True)
    outputs.mkdir(parents=True, exist_ok=True)
    return uploads, outputs


def _get_secret_key() -> str:
    env_key = os.environ.get("ABOGEN_SECRET_KEY")
    if env_key:
        return env_key

    try:
        settings_dir = Path(get_user_settings_dir())
        settings_dir.mkdir(parents=True, exist_ok=True)
        secret_file = settings_dir / ".secret_key"
        if secret_file.exists():
            return secret_file.read_text(encoding="utf-8").strip()

        key = os.urandom(24).hex()
        secret_file.write_text(key, encoding="utf-8")
        return key
    except Exception:
        # Fallback if we can't write to settings dir
        return os.urandom(24).hex()


def create_app(config: Optional[dict[str, Any]] = None) -> Flask:
    uploads_dir, outputs_dir = _default_dirs()

    app = Flask(
        __name__,
        static_folder="static",
        template_folder="templates",
    )
    base_config = {
        "SECRET_KEY": _get_secret_key(),
        "UPLOAD_FOLDER": str(uploads_dir),
        "OUTPUT_FOLDER": str(outputs_dir),
        "MAX_CONTENT_LENGTH": 1024 * 1024 * 400,  # 400 MB uploads
    }
    if config:
        base_config.update(config)
    app.config.update(base_config)

    service = build_service(
        runner=run_conversion_job,
        output_root=Path(app.config["OUTPUT_FOLDER"]),
        uploads_root=Path(app.config["UPLOAD_FOLDER"]),
    )
    app.extensions["conversion_service"] = service

    from abogen.web.routes import (
        main_bp,
        jobs_bp,
        settings_bp,
        voices_bp,
        entities_bp,
        books_bp,
        api_bp,
    )

    app.register_blueprint(main_bp)
    app.register_blueprint(jobs_bp, url_prefix="/jobs")
    app.register_blueprint(settings_bp, url_prefix="/settings")
    app.register_blueprint(voices_bp, url_prefix="/voices")
    app.register_blueprint(entities_bp, url_prefix="/overrides")
    app.register_blueprint(books_bp, url_prefix="/find-books")
    app.register_blueprint(api_bp, url_prefix="/api")

    atexit.register(service.shutdown)

    global _access_log_filter_attached
    if not _access_log_filter_attached:
        logging.getLogger("werkzeug").addFilter(_SuppressSuccessfulAccessFilter())
        _access_log_filter_attached = True

    return app


def main() -> None:
    app = create_app()
    host = os.environ.get("ABOGEN_HOST", "0.0.0.0")
    port = int(os.environ.get("ABOGEN_PORT", "8808"))
    debug = os.environ.get("ABOGEN_DEBUG", "false").lower() == "true"
    app.run(host=host, port=port, debug=debug)


if __name__ == "__main__":  # pragma: no cover
    main()