Can't emit state conditionally on stream values (Flutter-Bloc) - flutter

Question

In constructor of the following bloc, I subscribe to a stream of firebase auth changes. go_router handles redirection.
When a user signs in/out _onAppUserChanged is called. If successfully signed in, I await for user's firestore data to be fetched. If there is, among the data, a location entry, I need to emit AppState with status==AppStatus.hasLocation if and only if my CatalogBlog has emitted state with status==CatalogStatus.loaded. Neither await for (var catalogState in _catalogBloc.stream) nor adding a listener will work. AppState with status: AppStatus.hasLocation won't be emmited although CatalogBloc will definatelly emit with status==CatalogStatus.loaded at some point.
class AppBloc extends Bloc<AppEvent, AppState> {
final UserRepository _userRepository;
final AuthRepository _authRepository;
final CatalogBloc _catalogBloc;
AppBloc(
UserRepository userRepository,
AuthRepository authRepository,
PrefsRepository prefsRepository,
CatalogBloc catalogBloc,
) : _userRepository = userRepository,
_authRepository = authRepository,
_catalogBloc = catalogBloc,
super(const AppState()) {
on<AppUserChanged>(_onAppUserChanged);
on<AppSignOutRequested>(_onAppSignOutRequested);
on<AppSelectedLocationSet>(_onAppSelectedLocationSet);
_authRepository.getAuthStateChanges().listen((String uid) {
add(AppUserChanged(uid));
});
}
void _onAppUserChanged(AppUserChanged event, Emitter<AppState> emit) async {
if (event.uid.isEmpty) {
emit(const AppState(status: AppStatus.noUser));
} else {
await for (var user in _userRepository.getUserData(event.uid)) {
if (_catalogBloc.state.status == CatalogStatus.initial) {
_catalogBloc.add(CatalogStarted());
}
if (user.locations.isEmpty) {
// Go to '/location_search'
emit(AppState(status: AppStatus.noLocation, user: user));
} else {
// Wait for catalog data to be fetched, then go to '/catalog'
await for (var catalogState in _catalogBloc.stream) {
if (catalogState.status == CatalogStatus.loaded) {
emit(AppState(
status: AppStatus.hasLocation,
user: user,
selectedLocation: user.prefLocation,
));
}
}
}
}
}
}
}
App State:
enum AppStatus { initial, hasLocation, noLocation, noUser, error }
class AppState extends Equatable {
final AppStatus status;
final User user;
final Location? selectedLocation;
const AppState({
this.status = AppStatus.initial,
this.user = const User(),
this.selectedLocation = const Location(),
});
#override
List<Object?> get props => [status, user, selectedLocation];
AppState copyWith({
AppStatus? status,
User? user,
Location? selectedLocation,
}) {
return AppState(
status: status ?? this.status,
user: user ?? this.user,
selectedLocation: selectedLocation ?? this.selectedLocation);
}
}
AppEvents:
abstract class AppEvent extends Equatable {
const AppEvent();
#override
List<Object> get props => [];
}
class AppUserChanged extends AppEvent {
final String uid;
const AppUserChanged(this.uid);
#override
List<Object> get props => [uid];
}
User repo:
class UserRepository {
final FirebaseFirestore _db = FirebaseFirestore.instance;
late User? user;
Stream<User> getUserData(String uid) {
var documentStream = _db.collection('users').doc(uid).snapshots();
return documentStream.map((snapshot) {
var data = snapshot.data();
if (data != null) {
user = User.fromJson(data);
return user!;
}
throw Exception("Firestore entry was not created for the signed in user");
});
}
...
}