Initial Flutter booru app

lib/features/favorites/presentation/favorites_controller.dart

@@ -0,0 +1,27 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../../backend/backend.dart';
+import '../../../core/utils/result.dart';
+import 'favorites_state.dart';
+
+final favoritesControllerProvider =
+    AsyncNotifierProvider<FavoritesController, FavoritesState>(
+  FavoritesController.new,
+);
+
+class FavoritesController extends AsyncNotifier<FavoritesState> {
+  @override
+  Future<FavoritesState> build() async => FavoritesState(posts: await _load());
+
+  Future<void> remove(Post post) async {
+    await ref
+        .read(favoriteServiceProvider)
+        .removeFavorite(post.id, post.providerId);
+    state = AsyncData(FavoritesState(posts: await _load()));
+  }
+
+  Future<List<Post>> _load() async {
+    final result = await ref.read(favoriteServiceProvider).getFavoritePosts();
+    return result is Success<List<Post>> ? result.data : const [];
+  }
+}