import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:worldhopper/repositories/series_two_page_mode_repository.dart';

part 'two_page_mode_provider.g.dart';

/// Two-page spread display mode
enum TwoPageMode {
  off,
  auto,
}

/// Key for storing two-page mode preference in SharedPreferences
const String _twoPageModeKey = 'image_reader_two_page_mode';

/// Provider for two-page spread mode state management
@riverpod
class TwoPageModeNotifier extends _$TwoPageModeNotifier {
  @override
  TwoPageMode build() {
    _loadTwoPageMode();
    return TwoPageMode.auto; // Default value until loaded
  }

  /// Load two-page mode from SharedPreferences
  Future<void> _loadTwoPageMode() async {
    final prefs = await SharedPreferences.getInstance();
    final modeString = prefs.getString(_twoPageModeKey);

    if (modeString != null) {
      final mode = TwoPageMode.values.firstWhere(
        (m) => m.name == modeString,
        orElse: () => TwoPageMode.auto,
      );
      state = mode;
    }
  }

  /// Set two-page mode and persist to SharedPreferences
  Future<void> setTwoPageMode(TwoPageMode mode) async {
    state = mode;
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString(_twoPageModeKey, mode.name);
  }
}

/// Provider for per-series two-page mode overrides.
/// Parameterized by seriesFeedUrl. Returns null when no override is set.
@riverpod
class SeriesToPageModeNotifier extends _$SeriesToPageModeNotifier {
  @override
  TwoPageMode? build(String seriesFeedUrl) {
    _load(seriesFeedUrl);
    return null;
  }

  Future<void> _load(String seriesFeedUrl) async {
    final repo = SeriesToPageModeRepository();
    final mode = await repo.getTwoPageMode(seriesFeedUrl);
    state = mode;
  }

  Future<void> setTwoPageMode(TwoPageMode mode) async {
    state = mode;
    final repo = SeriesToPageModeRepository();
    await repo.setTwoPageMode(seriesFeedUrl, mode);
  }
}