import 'dart:async';

import 'package:mnemo_cards_common/mnemo_cards_common.dart';
import 'package:rxdart/rxdart.dart';

class LoadingPacksHolder {
  final StreamController<LoadingPacksState?> _streamController =
      StreamController.broadcast();
  LoadingPacksState? _state;

  LoadingPacksHolder();

  void addLoadingPack(
    CardPackLoadingDto dto,
  ) {
    _state = LoadingPacksState({
      ...?_state?.packs.where((p) => p.id != dto.id),
      dto,
    });
    _streamController.add(_state);
  }

  void removeLoadingPack(
    String id,
  ) {
    _state = LoadingPacksState(
      {...?_state?.packs.where((p) => p.id != id)},
    );
    _streamController.add(_state);
  }

  void clear() {
    _state = null;
    _streamController.add(_state);
  }

  LoadingPacksState? get state => _state;

  Stream<LoadingPacksState?> get asStream =>
      _streamController.stream.startWith(_state);
}

class LoadingPacksState {
  final Set<CardPackLoadingDto> packs;

  LoadingPacksState(
    this.packs,
  );
}