signOut method

@override Future<Either<AuthServiceSignOutFailure, Unit>> signOut({ bool useFbAuthAlso = true, })

Implementation

@override
Future<Either<AuthServiceSignOutFailure, Unit>> signOut({bool useFbAuthAlso = true}) async {
  // Clear cached auth state immediately
  _updateCachedState(false);

  // Cancel any pending completers
  if (_loginCheckCompleter != null && !_loginCheckCompleter!.isCompleted) {
    _safeCompleteLoginCheckWithError('User signed out');
  }

  // ...existing signOut code...
  try {
    // Call all onAboutToLogOut callbacks while still authenticated (before Firebase signOut)
    // This allows cleanup tasks like FCM token unregistration that require auth
    if (useFbAuthAlso && _onAboutToLogOutByPriority.isNotEmpty) {
      final timeout = Duration(milliseconds: AppConfigBase.timeoutForAboutToLogOutCallbackMill);
      await _executeVoidCallbacksByPriority(
        _onAboutToLogOutByPriority,
        timeout,
        'onAboutToLogOut',
      );
    }

    if (useFbAuthAlso) {
      await _fbAuth.signOut();
    }

    // Call all onLoggedOut callbacks (after sign out is complete)
    // Using a generous timeout for post-logout callbacks
    await _executeVoidCallbacksByPriority(
      _onLoggedOutByPriority,
      const Duration(seconds: 30),
      'onLoggedOut',
    );

    // Clear the cookie on the server if using federated auth
    if (AppConfigBase.useCookieFederatedAuth) {
      final http.Client client = http.Client();
      try {
        final response = await client
            .get(Uri.parse(RepoHelpers.getFunctionUrl(_fbAuth.app, 'authfunctions-signout')));

        if (response.statusCode == 204) {
          logd('Cleared cookie successfully');
        } else {
          logd('Failed to clear cookie!!');
          // Don't return error for cookie clear failure
        }
      } finally {
        client.close();
      }
    }

    // Note: FCM token cleanup has been moved to NotificationService.clearFcmToken()
    // Apps should call NotificationService.clearFcmToken() before signing out.

    _accessCodeCached = null;
  } on fb_auth.FirebaseAuthException catch (e) {
    loge(e);
    return left(AuthServiceSignOutFailure.unexpected);
  } catch (e) {
    loge(e);
    return left(AuthServiceSignOutFailure.unexpected);
  }

  return right(unit);
}