import 'package:flutter_bloc/flutter_bloc.dart%20%20';
import 'package:pmu_labs/presentation/like_bloc/like_event.dart';
import 'package:pmu_labs/presentation/like_bloc/like_state.dart';
import 'package:shared_preferences/shared_preferences.dart';

const String _likedPrefsKey = 'liked';

class LikeBloc extends Bloc<LikeEvent, LikeState>{
  LikeBloc() : super(const LikeState(likedIds: [])){
    on<ChangeLikeEvent>(_onChangeLike);
    on<LoadLikesEvent>(_onLoadLikes);
  }

  Future<void> _onLoadLikes(LoadLikesEvent event, Emitter<LikeState> emit) async{
    final prefs = await SharedPreferences.getInstance();
    final data = prefs.getStringList(_likedPrefsKey);

    emit(state.copyWith(likedIds: data));
  }

  Future<void> _onChangeLike(ChangeLikeEvent event, Emitter<LikeState> emit) async{
    final updatedList = List<String>.from(state.likedIds ?? []);

    if(updatedList.contains(event.id)){
      updatedList.remove(event.id);
    } else{
      updatedList.add(event.id);
    }

    final prefs = await SharedPreferences.getInstance();
    prefs.setStringList(_likedPrefsKey, updatedList);
    emit(state.copyWith(likedIds: updatedList));
  }
}