"""Konfiguration aus TOML-Datei mit sinnvollen Defaults."""

import os
import sys
from dataclasses import dataclass
from pathlib import Path
import tomllib


def _default_config_path() -> Path:
    if sys.platform == "win32":
        return Path(os.environ.get("APPDATA", "")) / "whisper-local" / "config.toml"
    return Path.home() / ".config" / "whisper-local" / "config.toml"


DEFAULT_CONFIG_PATH = _default_config_path()


@dataclass
class Config:
    hotkey: str = "KEY_F12"
    whisper_model: str = "small"
    language: str = "de"
    compute_type: str = "int8"
    sample_rate: int = 16000
    channels: int = 1
    min_duration: float = 0.5
    microphone: str = ""
    pause_media_during_recording: bool = True


def load_config(path: Path = DEFAULT_CONFIG_PATH) -> Config:
    """Lädt Config aus TOML-Datei. Gibt Defaults zurück wenn Datei fehlt."""
    config = Config()

    if not path.exists():
        return config

    with open(path, "rb") as f:
        data = tomllib.load(f)

    hotkey_section = data.get("hotkey", {})
    if "key" in hotkey_section:
        config.hotkey = hotkey_section["key"]

    whisper_section = data.get("whisper", {})
    if "model" in whisper_section:
        config.whisper_model = whisper_section["model"]
    if "language" in whisper_section:
        config.language = whisper_section["language"]
    if "compute_type" in whisper_section:
        config.compute_type = whisper_section["compute_type"]

    audio_section = data.get("audio", {})
    if "sample_rate" in audio_section:
        config.sample_rate = audio_section["sample_rate"]
    if "channels" in audio_section:
        config.channels = audio_section["channels"]
    if "min_duration" in audio_section:
        config.min_duration = audio_section["min_duration"]
    if "device" in audio_section:
        config.microphone = audio_section["device"]

    media_section = data.get("media", {})
    if "pause_during_recording" in media_section:
        config.pause_media_during_recording = bool(
            media_section["pause_during_recording"]
        )

    return config


def _toml_str(value: str) -> str:
    """Escaped einen String-Wert für TOML (verhindert ungültiges TOML bei Sonderzeichen)."""
    return value.replace("\\", "\\\\").replace('"', '\\"')


def save_config(config: Config, path: Path = DEFAULT_CONFIG_PATH) -> None:
    """Schreibt Config als TOML-Datei. Erstellt Verzeichnisse bei Bedarf."""
    path.parent.mkdir(parents=True, exist_ok=True)
    pause_media_str = "true" if config.pause_media_during_recording else "false"
    content = (
        f'[hotkey]\nkey = "{_toml_str(config.hotkey)}"\n\n'
        f'[whisper]\nmodel = "{_toml_str(config.whisper_model)}"\n'
        f'language = "{_toml_str(config.language)}"\n'
        f'compute_type = "{_toml_str(config.compute_type)}"\n\n'
        f'[audio]\nsample_rate = {config.sample_rate}\n'
        f'channels = {config.channels}\n'
        f'min_duration = {config.min_duration}\n'
        f'device = "{_toml_str(config.microphone)}"\n\n'
        f'[media]\npause_during_recording = {pause_media_str}\n'
    )
    path.write_text(content, encoding="utf-8")