"""
fcco-Converter V2 – Konfigurationsmodul

Lädt und speichert Anwendungseinstellungen plattformübergreifend.
Verwendet pathlib für alle Pfadoperationen.
"""

import json
import platform
import sys
from pathlib import Path

# ---- Globale App-Informationen (aus config.json) ----
APP_INFO = {
    "app_name": "fcco Converter",
    "app_version": "2.0.0",
    "repo_owner": "public",
    "repo_name": "fcco-Converter",
    "gitea_api_base": "https://git.joelunger.de/api/v1"
}

def _load_app_info():
    try:
        # Finde config.json relativ zum Skript oder im PyInstaller Bundle
        if getattr(sys, "frozen", False):
            if platform.system() == "Darwin":
                # Path(sys.executable) ist fcco-Converter.app/Contents/MacOS/executable
                base_dir = Path(sys.executable).parent.parent.parent.parent
            else:
                base_dir = Path(sys.executable).parent
        else:
            base_dir = Path(__file__).parent.parent
            
        config_path = base_dir / "config.json"
        if config_path.exists():
            with open(config_path, "r", encoding="utf-8") as f:
                data = json.load(f)
                APP_INFO.update(data)
    except Exception:
        pass

_load_app_info()

# =========================================================================
#  Farbschema
# =========================================================================

T = {
    "bg":           "#000000",
    "surface":      "#111111",
    "elevated":     "#1a1a1a",
    "card":         "#222222",
    "input":        "#000000",
    "accent":       "#ffffff",
    "accent_h":     "#e6e6e6",
    "success":      "#ffffff",
    "success_h":    "#e6e6e6",
    "warn":         "#ffffff",
    "error":        "#ffffff",
    "text":         "#ffffff",
    "text2":        "#b3b3b3",
    "muted":        "#808080",
    "border":       "#333333",
    "btn2":         "#1a1a1a",
    "btn2_h":       "#333333",
}

# Standardmäßige Export-Kategorien
DEFAULT_EXPORT_PATHS = {
    "Gottesdienst": "gottesdienste",
    "Hochzeit": "hochzeiten",
    "Weissagung": "weissagungen",
    "Jugend": "jugend",
}

# Kurze deutsche Wochentagsnamen für Ordnerbenennung
WEEKDAY_SHORT_DE = ["Mo", "Di", "Mi", "Do", "Fr", "Sa", "So"]

# ---- Audio-Einstellungen: Gültige Werte ----

BITRATE_OPTIONS = ["64", "96", "128", "160", "192", "224", "256", "320"]
SAMPLERATE_OPTIONS = ["Original", "22050", "44100", "48000"]
CHANNEL_OPTIONS = ["Original", "Mono", "Stereo"]
ENCODING_MODE_OPTIONS = ["CBR", "VBR"]
VBR_QUALITY_OPTIONS = [str(i) for i in range(10)]  # 0 (beste) bis 9 (schlechteste)
OUTPUT_FORMAT_OPTIONS = ["mp3", "flac", "ogg", "wav"]


def _get_config_dir() -> Path:
    """Gibt das plattformabhängige Konfigurationsverzeichnis zurück."""
    system = platform.system()
    if system == "Windows":
        base = Path.home() / "AppData" / "Roaming"
    elif system == "Darwin":
        base = Path.home() / "Library" / "Application Support"
    else:  # Linux / andere
        base = Path.home() / ".config"
    config_dir = base / "fcco-Converter"
    config_dir.mkdir(parents=True, exist_ok=True)
    return config_dir


CONFIG_DIR = _get_config_dir()
SETTINGS_FILE = CONFIG_DIR / "settings.json"
HISTORY_FILE = CONFIG_DIR / "history.json"


# ---- Standard-Einstellungen ----

DEFAULT_SETTINGS = {
    # Allgemein
    "threads": 0,  # 0 = auto (alle verfügbaren Kerne)
    "appearance_mode": "Dark",  # Dark / Light / System
    "check_updates_on_start": True,

    # Audio & Konvertierung
    "audio": {
        "output_format": "mp3",
        "bitrate": "192",           # kbit/s (nur CBR)
        "encoding_mode": "CBR",     # CBR oder VBR
        "vbr_quality": "2",         # 0 (beste) bis 9 (schlechteste)
        "sample_rate": "Original",  # Original, 22050, 44100, 48000
        "channels": "Original",     # Original, Mono, Stereo
        "overwrite_existing": True,
    },

    # Metadaten
    "metadata": {
        "artist": "",
        "cover": "",
        "auto_track_number": True,
        "auto_album_from_folder": True,
    },

    # Export-Pfade
    "export_paths": DEFAULT_EXPORT_PATHS.copy(),
}


def _deep_merge(base: dict, override: dict) -> dict:
    """Merged override-Werte in base, ohne fehlende Schlüssel zu verlieren."""
    result = base.copy()
    for key, value in override.items():
        if key in result and isinstance(result[key], dict) and isinstance(value, dict):
            result[key] = _deep_merge(result[key], value)
        else:
            result[key] = value
    return result


def load_settings() -> dict:
    """Lädt die Einstellungen aus der JSON-Datei.
    Fehlende Schlüssel werden mit Standardwerten aufgefüllt.
    """
    settings = DEFAULT_SETTINGS.copy()
    # Deep-copy verschachtelter Dicts
    settings["audio"] = DEFAULT_SETTINGS["audio"].copy()
    settings["metadata"] = DEFAULT_SETTINGS["metadata"].copy()
    settings["export_paths"] = DEFAULT_SETTINGS["export_paths"].copy()

    if SETTINGS_FILE.exists():
        try:
            with open(SETTINGS_FILE, "r", encoding="utf-8") as f:
                loaded = json.load(f)
            settings = _deep_merge(settings, loaded)
        except (json.JSONDecodeError, OSError):
            pass  # Bei fehlerhafter Datei: Standardwerte nutzen

    return settings


def save_settings(settings: dict) -> None:
    """Speichert die Einstellungen in die JSON-Datei."""
    with open(SETTINGS_FILE, "w", encoding="utf-8") as f:
        json.dump(settings, f, indent=2, ensure_ascii=False)


def save_export_history(entry: dict) -> None:
    """Fügt einen Export-Eintrag zur Historie hinzu."""
    history = []
    if HISTORY_FILE.exists():
        try:
            with open(HISTORY_FILE, "r", encoding="utf-8") as f:
                history = json.load(f)
        except (json.JSONDecodeError, OSError):
            history = []
    history.append(entry)
    with open(HISTORY_FILE, "w", encoding="utf-8") as f:
        json.dump(history, f, indent=2, ensure_ascii=False)