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

part 'reading_mode_provider.g.dart';

/// Reading direction modes for the image reader
enum ReadingMode {
  ltr,
  rtl,
  verticalContinuous,
}

/// Key for storing reading mode preference in SharedPreferences
const String _readingModeKey = 'image_reader_reading_mode';

/// Provider for image reader reading mode state management
@riverpod
class ReadingModeNotifier extends _$ReadingModeNotifier {
  @override
  ReadingMode build() {
    _loadReadingMode();
    return ReadingMode.ltr; // Default value until loaded
  }

  /// Load reading mode from SharedPreferences
  Future<void> _loadReadingMode() async {
    final prefs = await SharedPreferences.getInstance();
    final readingModeString = prefs.getString(_readingModeKey);

    if (readingModeString != null) {
      final readingMode = ReadingMode.values.firstWhere(
        (m) => m.name == readingModeString,
        orElse: () => ReadingMode.ltr,
      );
      state = readingMode;
    }
  }

  /// Set reading mode and persist to SharedPreferences
  Future<void> setReadingMode(ReadingMode mode) async {
    state = mode;
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString(_readingModeKey, mode.name);
  }
}

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

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

  Future<void> setReadingMode(ReadingMode mode) async {
    state = mode;
    final repo = SeriesReadingModeRepository();
    await repo.setReadingMode(seriesFeedUrl, mode);
  }
}