State Manager and Business Logic: Like Bloc

lib/presentation/bloc/like_bloc/like_bloc.dart

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+import 'package:candystore/presentation/bloc/like_bloc/like_event.dart';
+import 'package:candystore/presentation/bloc/like_bloc/like_state.dart';
+import 'package:flutter_bloc/flutter_bloc.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);
+
+    // Преобразуем список строк в список целых чисел
+    final likedIds = data?.map(int.parse).toList() ?? [];
+
+    emit(state.copyWith(likedIds: likedIds));
+  }
+
+  Future<void> _onChangeLike(ChangeLikeEvent event, Emitter<LikeState> emit) async {
+    final updatedList = List<int>.from(state.likedIds ?? []);
+
+    if (updatedList.contains(event.id)) {
+      updatedList.remove(event.id);
+    } else {
+      updatedList.add(event.id);
+    }
+
+    final prefs = await SharedPreferences.getInstance();
+
+    // Преобразуем список целых чисел обратно в строки перед сохранением
+    prefs.setStringList(_likedPrefsKey, updatedList.map((id) => id.toString()).toList());
+
+    emit(state.copyWith(likedIds: updatedList));
+  }
+}

lib/presentation/bloc/like_bloc/like_event.dart

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+abstract class LikeEvent {
+  const LikeEvent();
+}
+
+class LoadLikesEvent extends LikeEvent {
+  const LoadLikesEvent();
+}
+
+class ChangeLikeEvent extends LikeEvent {
+  final int id;
+
+  const ChangeLikeEvent(this.id);
+}

lib/presentation/bloc/like_bloc/like_state.dart

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+import 'package:equatable/equatable.dart';
+
+class LikeState extends Equatable {
+  final List<int>? likedIds;
+
+  const LikeState({required this.likedIds});
+
+  LikeState copyWith({List<int>? likedIds}) => LikeState(likedIds: likedIds ?? this.likedIds);
+
+  @override
+  List<Object?> get props => [likedIds];
+}