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

part of '../places_browser.dart';

@npLog
class _Bloc extends Bloc<_Event, _State> with BlocLogger {
  _Bloc({
    required this.account,
    required this.placesController,
  }) : super(_State.init()) {
    on<_LoadPlaces>(_onLoad);
    on<_Reload>(_onReload);
    on<_TransformItems>(_onTransformItems);
  }

  @override
  String get tag => _log.fullName;

  Future<void> _onLoad(_LoadPlaces ev, Emitter<_State> emit) {
    _log.info(ev);
    return emit.forEach<PlaceStreamEvent>(
      placesController.stream,
      onData: (data) => state.copyWith(
        places: data.data,
        isLoading: data.hasNext,
      ),
      onError: (e, stackTrace) {
        _log.severe("[_onLoad] Uncaught exception", e, stackTrace);
        return state.copyWith(
          isLoading: false,
          error: ExceptionEvent(e, stackTrace),
        );
      },
    );
  }

  void _onReload(_Reload ev, Emitter<_State> emit) {
    _log.info(ev);
    unawaited(placesController.reload());
  }

  Future<void> _onTransformItems(
      _TransformItems ev, Emitter<_State> emit) async {
    _log.info(ev);
    final transformedPlaces = ev.places.name
        .sorted(_sorter)
        .map((e) => _Item(account: account, place: e))
        .toList();
    final transformedCountries = ev.places.countryCode
        .sorted(_sorter)
        .map((e) => _Item(account: account, place: e))
        .toList();
    emit(state.copyWith(
      transformedPlaceItems: transformedPlaces,
      transformedCountryItems: transformedCountries,
    ));
  }

  final Account account;
  final PlacesController placesController;
}

int _sorter(LocationGroup a, LocationGroup b) {
  final compare = b.count.compareTo(a.count);
  if (compare == 0) {
    return a.place.compareTo(b.place);
  } else {
    return compare;
  }
}