import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'reaction_event.dart';
import 'reaction_state.dart';

const String _likedPrefsKey = 'liked';
const String _dislikedPrefsKey = 'disliked';

class ReactionBloc extends Bloc<ReactionEvent, ReactionState> {
  ReactionBloc() : super(const ReactionState(likedIds: [], dislikedIds: [])) {
    on<ChangeLikeEvent>(_onChangeLike);
    on<ChangeDislikeEvent>(_onChangeDislike);
    on<LoadReactionsEvent>(_onLoadReactions);
  }

  Future<void> _onLoadReactions(LoadReactionsEvent event, Emitter<ReactionState> emit) async {
    final prefs = await SharedPreferences.getInstance();
    final likedData = prefs.getStringList(_likedPrefsKey);
    final dislikedData = prefs.getStringList(_dislikedPrefsKey);

    emit(state.copyWith(
      likedIds: likedData ?? [],
      dislikedIds: dislikedData ?? [],
    ));
  }

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

    if (updatedLikedList.contains(event.id)) {
      updatedLikedList.remove(event.id);
    } else {
      updatedLikedList.add(event.id);
      updatedDislikedList.remove(event.id); // Убираем дизлайк, если он был
    }

    final prefs = await SharedPreferences.getInstance();
    prefs.setStringList(_likedPrefsKey, updatedLikedList);
    prefs.setStringList(_dislikedPrefsKey, updatedDislikedList);

    emit(state.copyWith(
      likedIds: updatedLikedList,
      dislikedIds: updatedDislikedList,
    ));
  }

  Future<void> _onChangeDislike(ChangeDislikeEvent event, Emitter<ReactionState> emit) async {
    final updatedLikedList = List<String>.from(state.likedIds ?? []);
    final updatedDislikedList = List<String>.from(state.dislikedIds ?? []);

    if (updatedDislikedList.contains(event.id)) {
      updatedDislikedList.remove(event.id);
    } else {
      updatedDislikedList.add(event.id);
      updatedLikedList.remove(event.id); // Убираем лайк, если он был
    }

    final prefs = await SharedPreferences.getInstance();
    prefs.setStringList(_likedPrefsKey, updatedLikedList);
    prefs.setStringList(_dislikedPrefsKey, updatedDislikedList);

    emit(state.copyWith(
      likedIds: updatedLikedList,
      dislikedIds: updatedDislikedList,
    ));
  }
}