This class is the Auth controller that extends

StateNotifier

from riverpod and sets state according to each method called:

dart
class AuthController extends StateNotifier<AuthState> {
  final AuthService _authService;
  AuthController(AuthService authService)
      : _authService = authService,
        super(const AuthState.loading()) {
    checkUserAuth();
  }

  void checkUserAuth() {
    if (_authService.currentUser == null) {
      state = const AuthState.unauthenticated();
    } else {
      state = const AuthState.authenticated();
    }
  }

  Future<void> loginUser(String username, String password) async {
    state = const AuthState.loading();

    Result result =
        await _authService.loginWithEmail(email: username, password: password);

    if (!result.isError) {
      state = const AuthState.authenticated();
    } else {
      state = const AuthState.unauthenticated();
    }
  }

  Future<Result> logoutUser() async {
    await _authService.logOut().onError(
          (error, stackTrace) => Result.error(message: 'ERROR: $error'),
        );

    state = const AuthState.unauthenticated();
    return Result.success(message: 'SUCCESS: You logged out!');
  }
}