init method

Implementation

Future<void> init() async {
  if (_isInitialized) return;

  // Add observer for system brightness changes
  WidgetsBinding.instance.addObserver(this);

  // Load saved preferences concurrently (each is a platform-channel call)
  final (
    String? savedThemeId,
    bool? savedFollowSystem,
    String? savedPreferredLight,
    String? savedPreferredDark,
  ) = await (
    _storage.readThemeId(),
    _storage.readFollowSystem(),
    _storage.readPreferredLightThemeId(),
    _storage.readPreferredDarkThemeId(),
  ).wait;

  // Load preferred themes
  _preferredLightThemeId = savedPreferredLight;
  _preferredDarkThemeId = savedPreferredDark;

  // Determine if this is first launch (no saved preferences)
  final bool isFirstLaunch =
      savedThemeId == null && savedFollowSystem == null;

  if (savedFollowSystem != null) {
    _followSystemTheme = savedFollowSystem;
  }

  if (savedThemeId != null && savedThemeId.isNotEmpty) {
    // Use saved theme if it exists in registered themes
    final bool themeExists = _themes.any((t) => t.id == savedThemeId);
    if (themeExists) {
      _setThemeInternal(savedThemeId, notify: true, persist: false);
    }
  } else if (isFirstLaunch && _initialThemeId != null) {
    // First launch: use initialThemeId if provided
    final bool themeExists = _themes.any((t) => t.id == _initialThemeId);
    if (themeExists) {
      _setThemeInternal(_initialThemeId!, notify: true, persist: true);
    }
  } else if (_followSystemTheme) {
    // Auto-detect from system brightness
    _applySystemTheme(notify: true, persist: true);
  }

  _isInitialized = true;
}