topics intermediate

app/lib/features/topics/domain/repositories/topic.dart

@@ -0,0 +1,52 @@
+import 'dart:ui';
+
+import 'package:lensai/features/topics/data/database/database.dart';
+import 'package:lensai/features/topics/data/providers.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'topic.g.dart';
+
+@Riverpod(keepAlive: true)
+class TopicRepository extends _$TopicRepository {
+  late TabDatabase _db;
+
+  @override
+  void build() {
+    _db = ref.watch(tabDatabaseProvider);
+  }
+
+  Future<void> addTopic({required String? name, required Color color}) {
+    return _db.topicDao.addTopic(name: name, color: color);
+  }
+
+  Future<void> replaceTopic({
+    required String id,
+    required String? name,
+    required Color color,
+  }) {
+    return _db.topicDao.replaceTopic(id, name: name, color: color);
+  }
+
+  Future<void> deleteTopic(String id) {
+    return _db.topicDao.deleteTopic(id);
+  }
+
+  Stream<List<TopicData>> watchTopics() {
+    return _db.topics().watch();
+  }
+
+  Stream<TopicData?> watchTopic(String? id) {
+    if (id != null) {
+      return _db.topicDao.getTopicData(id).watchSingleOrNull();
+    } else {
+      return Stream.value(null);
+    }
+  }
+
+  Future<Set<Color>> getDistinctColors() {
+    return _db.topicDao
+        .getDistinctColors()
+        .get()
+        .then((colors) => colors.toSet());
+  }
+}