feat(mobile): lazy loading of assets (#2413)

mobile/lib/modules/favorite/providers/favorite_provider.dart

@@ -1,68 +1,25 @@
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/modules/home/ui/asset_grid/asset_grid_data_structure.dart';
+import 'package:immich_mobile/modules/settings/providers/app_settings.provider.dart';
+import 'package:immich_mobile/modules/settings/services/app_settings.service.dart';
 import 'package:immich_mobile/shared/models/asset.dart';
-import 'package:immich_mobile/shared/providers/asset.provider.dart';
+import 'package:immich_mobile/shared/models/store.dart';
+import 'package:immich_mobile/shared/providers/db.provider.dart';
+import 'package:isar/isar.dart';
 
-class FavoriteSelectionNotifier extends StateNotifier<Set<int>> {
-  FavoriteSelectionNotifier(this.assetsState, this.assetNotifier) : super({}) {
-    state = assetsState.allAssets
-        .where((asset) => asset.isFavorite)
-        .map((asset) => asset.id)
-        .toSet();
+final favoriteAssetsProvider = StreamProvider<RenderList>((ref) async* {
+  final query = ref
+      .watch(dbProvider)
+      .assets
+      .filter()
+      .ownerIdEqualTo(Store.get(StoreKey.currentUser).isarId)
+      .isFavoriteEqualTo(true)
+      .sortByFileCreatedAt();
+  final settings = ref.watch(appSettingsServiceProvider);
+  final groupBy =
+      GroupAssetsBy.values[settings.getSetting(AppSettingsEnum.groupAssetsBy)];
+  yield await RenderList.fromQuery(query, groupBy);
+  await for (final _ in query.watchLazy()) {
+    yield await RenderList.fromQuery(query, groupBy);
   }
-
-  final AssetsState assetsState;
-  final AssetNotifier assetNotifier;
-
-  void _setFavoriteForAssetId(int id, bool favorite) {
-    if (!favorite) {
-      state = state.difference({id});
-    } else {
-      state = state.union({id});
-    }
-  }
-
-  bool _isFavorite(int id) {
-    return state.contains(id);
-  }
-
-  Future<void> toggleFavorite(Asset asset) async {
-    // TODO support local favorite assets
-    if (asset.storage == AssetState.local) return;
-    _setFavoriteForAssetId(asset.id, !_isFavorite(asset.id));
-
-    await assetNotifier.toggleFavorite(
-      asset,
-      state.contains(asset.id),
-    );
-  }
-
-  Future<void> addToFavorites(Iterable<Asset> assets) {
-    state = state.union(assets.map((a) => a.id).toSet());
-    final futures = assets.map(
-      (a) => assetNotifier.toggleFavorite(
-        a,
-        true,
-      ),
-    );
-
-    return Future.wait(futures);
-  }
-}
-
-final favoriteProvider =
-    StateNotifierProvider<FavoriteSelectionNotifier, Set<int>>((ref) {
-  return FavoriteSelectionNotifier(
-    ref.watch(assetProvider),
-    ref.watch(assetProvider.notifier),
-  );
-});
-
-final favoriteAssetProvider = StateProvider((ref) {
-  final favorites = ref.watch(favoriteProvider);
-
-  return ref
-      .watch(assetProvider)
-      .allAssets
-      .where((element) => favorites.contains(element.id))
-      .toList();
 });