import 'package:shared_preferences/shared_preferences.dart';

import '../library/song_sort.dart';

/// Sortier-Wahl einer Liederliste: Kriterium + Richtung.
class SortSetting {
  const SortSetting(this.mode, {required this.ascending});
  final SortMode mode;
  final bool ascending;
}

/// Merkt sich die Sortier-Wahl pro Liste ([key] z. B. 'meine_musik'),
/// damit sie einen App-Neustart überlebt.
class SortStore {
  static const meineMusik = 'meine_musik';
  static const favoriten = 'favoriten';

  static const _standard = SortSetting(SortMode.dateAdded, ascending: false);

  static Future<SortSetting> load(String key) async {
    final prefs = await SharedPreferences.getInstance();
    final index = prefs.getInt('sort_${key}_mode');
    if (index == null || index < 0 || index >= SortMode.values.length) {
      return _standard;
    }
    final mode = SortMode.values[index];
    return SortSetting(
      mode,
      ascending: prefs.getBool('sort_${key}_asc') ?? defaultAscending(mode),
    );
  }

  static Future<void> save(String key, SortSetting setting) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setInt('sort_${key}_mode', setting.mode.index);
    await prefs.setBool('sort_${key}_asc', setting.ascending);
  }
}