nc-photos/app/lib/widget/double_tap_exit_container/bloc.dart

part of 'double_tap_exit_container.dart';

@npLog
class _Bloc extends Bloc<_Event, _State> with BlocLogger {
  _Bloc({
    required this.prefController,
  }) : super(_State.init(
          isDoubleTapExit: prefController.isDoubleTapExitValue,
        )) {
    on<_SetDoubleTapExit>(_onSetDoubleTapExit);
    on<_SetCanPop>(_onSetCanPop);
    on<_OnPopInvoked>(_onOnPopInvoked);

    _subscriptions.add(prefController.isDoubleTapExitChange.listen((ev) {
      add(_SetDoubleTapExit(ev));
    }));
  }

  @override
  Future<void> close() {
    for (final s in _subscriptions) {
      s.cancel();
    }
    _timer?.cancel();
    return super.close();
  }

  @override
  String get tag => _log.fullName;

  void _onSetDoubleTapExit(_SetDoubleTapExit ev, _Emitter emit) {
    _log.info(ev);
    emit(state.copyWith(isDoubleTapExit: ev.value));
  }

  void _onSetCanPop(_SetCanPop ev, _Emitter emit) {
    _log.info(ev);
    emit(state.copyWith(canPop: ev.value));
  }

  void _onOnPopInvoked(_OnPopInvoked ev, _Emitter emit) {
    _log.info(ev);
    if (state.isDoubleTapExit && !state.canPop) {
      emit(state.copyWith(canPop: true));
      _timer?.cancel();
      _timer = Timer(
        const Duration(seconds: 5),
        () {
          add(const _SetCanPop(false));
        },
      );
      SnackBarManager().showSnackBar(SnackBar(
        content: Text(L10n.global().doubleTapExitNotification),
        duration: k.snackBarDurationShort,
      ));
    }
  }

  final PrefController prefController;

  final _subscriptions = <StreamSubscription>[];
  Timer? _timer;
}