# app/utils/helpers.py
import os
import json
import logging

try:
    # Flask ist optional – bei Aufruf außerhalb des App-Contexts fallbacken wir
    from flask import current_app
except Exception:  # pragma: no cover - nur wenn Flask nicht verfügbar ist
    current_app = None

logger = logging.getLogger(__name__)

def _resolve_config_dir(config_dir=None):
    """
    Ermittelt den zu nutzenden Config-Pfad:
    1) Expliziter Parameter
    2) Flask current_app.config['CONFIG_DIR']
    3) Fallback: lokaler 'configs' Ordner
    """
    if config_dir:
        return config_dir
    if current_app:
        try:
            return current_app.config.get('CONFIG_DIR', 'configs')
        except Exception:
            pass
    return 'configs'


def load_configs(config_dir=None):
    """
    Lädt alle .json-Konfigurationsdateien aus dem configs-Ordner,
    außer default_sounds.json (die wird separat geladen).
    """
    config_dir = _resolve_config_dir(config_dir)
    configs = []
    if not os.path.exists(config_dir):
        logger.warning(f"Config-Verzeichnis nicht gefunden: {config_dir}")
        return configs

    for filename in os.listdir(config_dir):
        if not filename.lower().endswith('.json'):
            continue
        if filename == 'default_sounds.json':
            continue  # globale Sounds separat laden

        path = os.path.join(config_dir, filename)
        try:
            with open(path, 'r', encoding='utf-8') as f:
                data = json.load(f)
                data['filename'] = filename
                data.setdefault('name', filename.replace('.json', '').replace('_', ' ').title())
                configs.append(data)
        except json.JSONDecodeError as e:
            logger.error(f"Ungültiges JSON in {filename}: {e}")
        except FileNotFoundError:
            logger.error(f"Datei nicht gefunden (trotz listdir): {path}")
        except Exception as e:
            logger.error(f"Fehler beim Laden von {filename}: {e}")

    return sorted(configs, key=lambda x: x.get('name', ''))


def load_default_sounds(config_dir=None):
    """
    Lädt die globalen Standard-Sounds aus configs/default_sounds.json
    Wird immer geladen, unabhängig von der aktuellen Lok-Konfiguration
    """
    config_dir = _resolve_config_dir(config_dir)
    path = os.path.join(config_dir, 'default_sounds.json')

    if not os.path.exists(path):
        logger.info("Keine default_sounds.json gefunden → keine globalen Sounds")
        return []

    try:
        with open(path, 'r', encoding='utf-8') as f:
            data = json.load(f)
            # Flexibel: entweder 'global_sounds' oder direkt 'sounds'
            sounds = data.get('global_sounds', data.get('sounds', []))
            logger.info(f"Globale Default-Sounds geladen: {len(sounds)} Einträge")
            return sounds
    except json.JSONDecodeError as e:
        logger.error(f"Ungültiges JSON in default_sounds.json: {e}")
        return []
    except Exception as e:
        logger.error(f"Fehler beim Laden default_sounds.json: {e}")
        return []


# ---------- Soundboard-Themen ----------

def load_soundboard_configs(config_dir=None):
    """
    Lädt alle Soundboard-Themen aus einem separaten Ordner (z. B. soundboards/).
    Unterstützt Unterordner. Jede *.json gilt als Thema (z. B. soundboards/station/theme.json).
    Erwartet Schema mit keys wie backgrounds / random_pool / sounds.
    """
    config_dir = config_dir or _resolve_config_dir(None)
    configs = []
    if not os.path.exists(config_dir):
        logger.warning(f"Soundboard-Verzeichnis nicht gefunden: {config_dir}")
        return configs

    for root, _, files in os.walk(config_dir):
        for filename in files:
            if not filename.lower().endswith('.json'):
                continue
            rel_path = os.path.relpath(os.path.join(root, filename), config_dir)
            try:
                with open(os.path.join(config_dir, rel_path), 'r', encoding='utf-8') as f:
                    data = json.load(f)
                    data['filename'] = rel_path  # relativer Pfad ab soundboards/
                    data.setdefault('name', filename.replace('.json', '').replace('_', ' ').title())
                    configs.append(data)
            except Exception as e:
                logger.error(f"Fehler beim Laden Soundboard {rel_path}: {e}")
    return sorted(configs, key=lambda x: x.get('name', ''))


def load_soundboard_config(filename, config_dir, sounds_dir=None):
    """
    Lädt ein Soundboard-Theme. Falls die Theme-Datei in Unterordnern liegt,
    wird ein basis Sound-Pfad auf denselben relativen Unterordner unterhalb von sounds/ gesetzt.
    Alle Einträge (backgrounds/sounds/random_pool) erhalten ein 'base_path'.
    """
    sounds_dir = sounds_dir or 'sounds'
    path = os.path.normpath(os.path.join(config_dir, filename))
    if not path.startswith(os.path.abspath(config_dir)):
        raise ValueError("Ungültiger Pfad")

    rel_dir = os.path.dirname(filename)  # z.B. "station" oder "urban/night"
    base_sound_dir = os.path.normpath(os.path.join(sounds_dir, rel_dir)) if rel_dir else sounds_dir

    with open(path, 'r', encoding='utf-8') as f:
        data = json.load(f)
        data['filename'] = filename  # relative Angabe beibehalten
        data.setdefault('name', filename.replace('.json', '').replace('_', ' ').title())
        data['base_sound_dir'] = base_sound_dir

        for key in ('backgrounds', 'sounds', 'random_pool'):
            if key in data and isinstance(data[key], list):
                for item in data[key]:
                    item.setdefault('base_path', base_sound_dir)
        return data