#268 groups: listening to source/dynamics to remove groups with obsolete content

CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to this project will be documented in this file.
 ### Fixed
 
 - opening home when launching app as media picker
+- removing groups with obsolete albums
 
 ## <a id="v1.13.1"></a>[v1.13.1] - 2025-05-14
 

lib/model/covers.dart

@@ -40,6 +40,8 @@ class Covers {
 
   Set<CoverRow> _rows = {};
 
+  // do not subscribe to events from other modules in constructor
+  // so that modules can subscribe to each other
   Covers._private();
 
   Future<void> init() async {

lib/model/dynamic_albums.dart

@@ -21,13 +21,15 @@ class DynamicAlbums with ChangeNotifier {
 
   final EventBus eventBus = EventBus();
 
+  // do not subscribe to events from other modules in constructor
+  // so that modules can subscribe to each other
   DynamicAlbums._private() {
     if (kFlutterMemoryAllocationsEnabled) ChangeNotifier.maybeDispatchObjectCreation(this);
-    _subscriptions.add(albumGrouping.eventBus.on<GroupUriChangedEvent>().listen((e) => _onGroupUriChanged(e.oldGroupUri, e.newGroupUri)));
   }
 
   Future<void> init() async {
     _rows = (await localMediaDb.loadAllDynamicAlbums()).map((v) => DynamicAlbumFilter(v.name, v.filter)).toSet();
+    _subscriptions.add(albumGrouping.eventBus.on<GroupUriChangedEvent>().listen((e) => _onGroupUriChanged(e.oldGroupUri, e.newGroupUri)));
   }
 
   int get count => _rows.length;
@@ -57,6 +59,7 @@ class DynamicAlbums with ChangeNotifier {
     await _lock.synchronized(() async {
       await _doRemove(filters.map((filter) => filter.name).toSet());
       notifyListeners();
+      eventBus.fire(DynamicAlbumChangedEvent(Map.fromEntries(filters.map((v) => MapEntry(v, null)))));
     });
   }
 
@@ -81,13 +84,7 @@ class DynamicAlbums with ChangeNotifier {
     });
   }
 
-  Future<void> clear() async {
-    await _lock.synchronized(() async {
-      await localMediaDb.clearDynamicAlbums();
-      _rows.clear();
-      notifyListeners();
-    });
-  }
+  Future<void> clear() => remove(all);
 
   DynamicAlbumFilter? get(String name) => _rows.firstWhereOrNull((row) => row.name == name);
 

lib/model/grouping/common.dart

@@ -1,10 +1,17 @@
+import 'dart:async';
 import 'dart:convert';
 
+import 'package:aves/model/dynamic_albums.dart';
 import 'package:aves/model/filters/container/album_group.dart';
+import 'package:aves/model/filters/container/dynamic_album.dart';
 import 'package:aves/model/filters/container/group_base.dart';
 import 'package:aves/model/filters/container/set_or.dart';
+import 'package:aves/model/filters/covered/stored_album.dart';
 import 'package:aves/model/filters/filters.dart';
 import 'package:aves/model/grouping/convert.dart';
+import 'package:aves/model/source/album.dart';
+import 'package:aves/model/source/collection_source.dart';
+import 'package:aves/model/source/events.dart';
 import 'package:aves/services/common/services.dart';
 import 'package:aves/utils/collection_utils.dart';
 import 'package:collection/collection.dart';
@@ -28,18 +35,53 @@ class FilterGrouping<T extends GroupBaseFilter> with ChangeNotifier {
   final String _host;
   final T Function(Uri uri, SetOrFilter filter) _createGroupFilter;
   final Map<Uri, Set<Uri>> _groups = {};
+  final Set<StreamSubscription> _subscriptions = {};
+  final Map<CollectionSource, Set<StreamSubscription>> _sourceSubscriptions = {};
+  CollectionSource? _source;
 
   Map<Uri, Set<Uri>> get allGroups => Map.unmodifiable(_groups);
 
+  // do not subscribe to events from other modules in constructor
+  // so that modules can subscribe to each other
   FilterGrouping._private(this._host, this._createGroupFilter) {
     if (kFlutterMemoryAllocationsEnabled) ChangeNotifier.maybeDispatchObjectCreation(this);
   }
 
-  void init(Map<Uri, Set<Uri>> groups) {
+  void init() {
+    _subscriptions.add(dynamicAlbums.eventBus.on<DynamicAlbumChangedEvent>().listen((e) => _clearObsoleteFilters()));
+  }
+
+  void setGroups(Map<Uri, Set<Uri>> groups) {
     _groups.clear();
     _groups.addAll(groups);
   }
 
+  @override
+  void dispose() {
+    _subscriptions
+      ..forEach((sub) => sub.cancel())
+      ..clear();
+    _sourceSubscriptions.keys.toSet().forEach(unregisterSource);
+    super.dispose();
+  }
+
+  void registerSource(CollectionSource source) {
+    unregisterSource(_source);
+    final sourceEvents = source.eventBus;
+    _sourceSubscriptions[source] = {
+      sourceEvents.on<EntryMovedEvent>().listen((e) => _clearObsoleteFilters()),
+      sourceEvents.on<EntryRemovedEvent>().listen((e) => _clearObsoleteFilters()),
+      sourceEvents.on<AlbumsChangedEvent>().listen((e) => _clearObsoleteFilters()),
+    };
+    _source = source;
+  }
+
+  void unregisterSource(CollectionSource? source) {
+    _sourceSubscriptions.remove(source)
+      ?..forEach((sub) => sub.cancel())
+      ..clear();
+  }
+
   void addToGroup(Set<Uri> childrenUris, Uri? destinationGroup) {
     _removeFromGroups(childrenUris);
     if (destinationGroup != null) {
@@ -73,9 +115,9 @@ class FilterGrouping<T extends GroupBaseFilter> with ChangeNotifier {
   int countLeaves(Uri? groupUri) {
     int count = 0;
     if (groupUri != null) {
-      final childrenUri = _groups[groupUri];
-      if (childrenUri != null) {
-        childrenUri.map(uriToFilter).nonNulls.forEach((filter) {
+      final childrenUris = _groups[groupUri];
+      if (childrenUris != null) {
+        childrenUris.map(uriToFilter).nonNulls.forEach((filter) {
           if (filter is GroupBaseFilter) {
             count += countLeaves(filter.uri);
           } else {
@@ -93,15 +135,15 @@ class FilterGrouping<T extends GroupBaseFilter> with ChangeNotifier {
     if (currentGroupUri == null) {
       return _groups.entries.where((kv) => getParentGroup(kv.key) == currentGroupUri).map((kv) {
         final groupUri = kv.key;
-        final childrenUri = kv.value;
-        final childrenFilters = childrenUri.map(uriToFilter).nonNulls.toSet();
+        final childrenUris = kv.value;
+        final childrenFilters = childrenUris.map(uriToFilter).nonNulls.toSet();
         return _createGroupFilter(groupUri, SetOrFilter(childrenFilters));
       }).toSet();
     }
 
-    final childrenUri = _groups.entries.firstWhereOrNull((kv) => kv.key == currentGroupUri)?.value;
-    if (childrenUri != null) {
-      return childrenUri.map(uriToFilter).nonNulls.toSet();
+    final childrenUris = _groups.entries.firstWhereOrNull((kv) => kv.key == currentGroupUri)?.value;
+    if (childrenUris != null) {
+      return childrenUris.map(uriToFilter).nonNulls.toSet();
     }
 
     return {};
@@ -172,6 +214,46 @@ class FilterGrouping<T extends GroupBaseFilter> with ChangeNotifier {
     }
   }
 
+  void _clearObsoleteFilters() {
+    final source = _source;
+    if (source == null || source.targetScope != CollectionSource.fullScope || !source.isReady) return;
+
+    _groups.entries.forEach((kv) {
+      final groupUri = kv.key;
+      final childrenUris = kv.value;
+
+      final rawAlbums = source.rawAlbums;
+      final allEntries = source.allEntries;
+
+      childrenUris.toSet().forEach((childUri) {
+        final filter = uriToFilter(childUri);
+        var valid = false;
+        if (filter != null) {
+          switch (filter) {
+            case GroupBaseFilter _:
+              valid = true;
+            case StoredAlbumFilter _:
+              // check album itself
+              final isVisibleAlbum = rawAlbums.contains(filter.album);
+              if (isVisibleAlbum) {
+                valid = true;
+              } else {
+                // check non-visible content (hidden, trash, etc.)
+                valid = allEntries.any(filter.test);
+              }
+            case DynamicAlbumFilter _:
+              valid = dynamicAlbums.contains(filter.name);
+          }
+        }
+        if (!valid) {
+          childrenUris.remove(childUri);
+          debugPrint('Removed obsolete childUri=$childUri from group=$groupUri');
+        }
+      });
+    });
+    _cleanEmptyGroups();
+  }
+
   // group uri / filter conversion
 
   static String? getGroupPath(Uri? uri) => uri?.queryParameters[_groupPathParamKey];

lib/model/source/media_store_source.dart

@@ -60,7 +60,9 @@ class MediaStoreSource extends CollectionSource {
     await localMediaDb.init();
     await vaults.init();
     await favourites.init();
-    albumGrouping.init(settings.albumGroups);
+    albumGrouping.init();
+    albumGrouping.setGroups(settings.albumGroups);
+    albumGrouping.registerSource(this);
     await covers.init();
     await dynamicAlbums.init();
 

lib/widgets/settings/app_export/items.dart

@@ -39,7 +39,7 @@ extension ExtraAppExportItem on AppExportItem {
         favourites.import(jsonMap, source);
       case AppExportItem.settings:
         await settings.import(jsonMap);
-        albumGrouping.init(settings.albumGroups);
+        albumGrouping.setGroups(settings.albumGroups);
     }
   }
 }

test/fake/db.dart

@@ -125,6 +125,9 @@ class FakeAvesDb extends Fake implements LocalMediaDb {
   @override
   Future<void> addDynamicAlbums(Set<DynamicAlbumRow> rows) => SynchronousFuture(null);
 
+  @override
+  Future<void> removeDynamicAlbums(Set<String> names) => SynchronousFuture(null);
+
   // video playback
 
   @override

test/model/collection_source_test.dart

@@ -8,6 +8,8 @@ import 'package:aves/model/entry/extensions/favourites.dart';
 import 'package:aves/model/favourites.dart';
 import 'package:aves/model/filters/covered/stored_album.dart';
 import 'package:aves/model/filters/covered/tag.dart';
+import 'package:aves/model/grouping/common.dart';
+import 'package:aves/model/grouping/convert.dart';
 import 'package:aves/model/metadata/address.dart';
 import 'package:aves/model/metadata/catalog.dart';
 import 'package:aves/model/settings/settings.dart';
@@ -32,10 +34,10 @@ import 'package:shared_preferences_platform_interface/shared_preferences_platfor
 
 import '../fake/android_app_service.dart';
 import '../fake/availability.dart';
+import '../fake/db.dart';
 import '../fake/device_service.dart';
 import '../fake/media_fetch_service.dart';
 import '../fake/media_store_service.dart';
-import '../fake/db.dart';
 import '../fake/metadata_fetch_service.dart';
 import '../fake/report_service.dart';
 import '../fake/storage_service.dart';
@@ -73,12 +75,17 @@ void main() {
     await settings.init(monitorPlatformSettings: false);
     settings.canUseAnalysisService = false;
     await androidFileUtils.init();
+    albumGrouping.init();
   });
 
   setUp(() async {
     (getIt<MediaStoreService>() as FakeMediaStoreService).reset();
   });
 
+  tearDown(() async {
+    albumGrouping.setGroups({});
+  });
+
   tearDownAll(() async {
     await getIt.reset();
   });
@@ -397,4 +404,28 @@ void main() {
       ),
     );
   });
+
+  test('groups are cleared when removing entries', () async {
+    final image1 = FakeMediaStoreService.newImage(testAlbum, 'image1');
+    (mediaStoreService as FakeMediaStoreService).entries = {
+      image1,
+    };
+
+    final albumFilter = StoredAlbumFilter(image1.directory!, 'whatever');
+
+    final source = await _initSource();
+    final groupUri = albumGrouping.buildGroupUri(null, 'some group name');
+    final childUri = GroupingConversion.filterToUri(albumFilter);
+    albumGrouping.addToGroup({childUri}.nonNulls.toSet(), groupUri);
+    expect(source.rawAlbums.length, 1);
+    expect(albumGrouping.exists(groupUri), true);
+
+    await source.removeEntries({image1.uri}, includeTrash: true);
+
+    // waiting for microtask to make sure event bus listeners executed
+    await Future.microtask(() {});
+
+    expect(source.rawAlbums.length, 0);
+    expect(albumGrouping.exists(groupUri), false);
+  });
 }

test/model/filters_test.dart

@@ -29,13 +29,17 @@ import '../fake/media_store_service.dart';
 import '../fake/storage_service.dart';
 
 void main() {
+  setUpAll(() async {
+    albumGrouping.init();
+  });
+
   setUp(() async {
     // specify Posix style path context for consistent behaviour when running tests on Windows
     getIt.registerLazySingleton<p.Context>(() => p.Context(style: p.Style.posix));
   });
 
   tearDown(() async {
-    albumGrouping.init({});
+    albumGrouping.setGroups({});
     await getIt.reset();
   });
 

test/model/grouping/common_test.dart

@@ -16,6 +16,10 @@ void main() {
   const groupName = 'some group name';
   const storedAlbumPath = '/path/to/album';
 
+  setUpAll(() async {
+    albumGrouping.init();
+  });
+
   setUp(() async {
     // specify Posix style path context for consistent behaviour when running tests on Windows
     getIt.registerLazySingleton<p.Context>(() => p.Context(style: p.Style.posix));
@@ -23,7 +27,7 @@ void main() {
   });
 
   tearDown(() async {
-    albumGrouping.init({});
+    albumGrouping.setGroups({});
     await dynamicAlbums.clear();
     await getIt.reset();
   });