topics intermediate

app/lib/features/topics/data/database/daos/topic.dart

@@ -0,0 +1,53 @@
+import 'dart:ui';
+
+import 'package:drift/drift.dart';
+import 'package:lensai/core/uuid.dart';
+import 'package:lensai/features/topics/data/database/database.dart';
+
+part 'topic.g.dart';
+
+@DriftAccessor()
+class TopicDao extends DatabaseAccessor<TabDatabase> with _$TopicDaoMixin {
+  TopicDao(super.db);
+
+  Future<void> addTopic({String? name, required Color color}) {
+    return db.topic.insertOne(
+      TopicCompanion.insert(
+        id: uuid.v7(),
+        name: Value(name),
+        color: color,
+      ),
+    );
+  }
+
+  Future<void> replaceTopic(
+    String id, {
+    required String? name,
+    required Color color,
+  }) {
+    return db.topic.replaceOne(
+      TopicCompanion(
+        id: Value(id),
+        name: Value(name),
+        color: Value(color),
+      ),
+    );
+  }
+
+  Future<void> deleteTopic(String id) {
+    return db.topic.deleteOne(TopicCompanion.custom(id: Variable(id)));
+  }
+
+  SingleOrNullSelectable<TopicData> getTopicData(String id) {
+    return select(db.topic)..where((t) => t.id.equals(id));
+  }
+
+  Selectable<Color> getDistinctColors() {
+    final query = db.selectOnly(db.topic, distinct: true)
+      ..addColumns([db.topic.color])
+      ..where(db.topic.color.isNotNull());
+
+    return query
+        .map((row) => row.readWithConverter<Color?, int>(db.topic.color)!);
+  }
+}