dispose method

Implementation

Future<NotificationFailure?> dispose() async {
  try {
    if (!_isInitialized) return null;

    // Cancel Firebase foreground subscription
    await _firebaseForegroundSubscription?.cancel();
    _firebaseForegroundSubscription = null;

    // Dispose foreground notification manager
    final ForegroundNotificationManager? foregroundManager =
        _foregroundManager;
    if (foregroundManager != null) {
      final NotificationFailure? foregroundError = foregroundManager
          .dispose();
      if (foregroundError != null) {
        safeDebugLog(
          'Foreground manager disposal failed: ${foregroundError.message}',
        );
      }
    }

    // Dispose both repositories
    final NotificationFailure? firebaseError = await _firebaseRepository
        .dispose();
    final NotificationFailure? localError = await _localRepository.dispose();

    _isInitialized = false;
    _userPreferences = null;

    safeDebugLog('Comprehensive notification manager disposed');

    // Return the first error if any
    return firebaseError ?? localError;
  } catch (e, stackTrace) {
    safeDebugLog('Failed to dispose notification manager: $e');
    return NotificationFailure.unknown(
      details: e.toString(),
      stackTrace: stackTrace,
    );
  }
}