refactor to per row store

mobile/test/medium/repositories/metadata_repository_test.dart

@@ -0,0 +1,153 @@
+import 'package:drift/drift.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/domain/models/log.model.dart';
+import 'package:immich_mobile/domain/models/metadata_key.dart';
+import 'package:immich_mobile/infrastructure/entities/metadata.entity.drift.dart';
+import 'package:immich_mobile/infrastructure/repositories/metadata.repository.dart';
+
+import '../repository_context.dart';
+
+void main() {
+  late MediumRepositoryContext ctx;
+  late MetadataRepository sut;
+
+  setUpAll(() async {
+    ctx = MediumRepositoryContext();
+    sut = await MetadataRepository.ensureInitialized(ctx.db);
+  });
+
+  tearDownAll(() async {
+    await ctx.dispose();
+  });
+
+  setUp(() async {
+    await ctx.db.delete(ctx.db.metadataEntity).go();
+    await MetadataRepository.refresh();
+  });
+
+  group('defaults', () {
+    test('appConfig returns key defaults when DB is empty', () {
+      expect(sut.appConfig.theme.mode, ThemeMode.system);
+    });
+
+    test('systemConfig returns key defaults when DB is empty', () {
+      expect(sut.systemConfig.log.level, LogLevel.info);
+    });
+  });
+
+  group('write', () {
+    test('persists a value and reflects it in the composed view', () async {
+      await sut.write(.themeMode, ThemeMode.dark);
+      expect(sut.appConfig.theme.mode, ThemeMode.dark);
+    });
+
+    test('persists across domains independently', () async {
+      await sut.write(.themeMode, ThemeMode.light);
+      await sut.write(.logLevel, LogLevel.severe);
+      expect(sut.appConfig.theme.mode, ThemeMode.light);
+      expect(sut.systemConfig.log.level, LogLevel.severe);
+    });
+  });
+
+  group('delete', () {
+    test('removes the row and reverts to default', () async {
+      await sut.write(.themeMode, ThemeMode.dark);
+      expect(sut.appConfig.theme.mode, ThemeMode.dark);
+
+      await sut.delete(.themeMode);
+      expect(sut.appConfig.theme.mode, ThemeMode.system);
+
+      final rows = await ctx.db.select(ctx.db.metadataEntity).get();
+      expect(rows, isEmpty);
+    });
+  });
+
+  group('clearDomain', () {
+    test('clears every key in the domain and leaves other domains alone', () async {
+      await sut.write(.themeMode, ThemeMode.dark);
+      await sut.write(.logLevel, LogLevel.severe);
+
+      await sut.clearDomain(.appConfig);
+
+      expect(sut.appConfig.theme.mode, ThemeMode.system);
+      expect(sut.systemConfig.log.level, LogLevel.severe);
+
+      final remainingKeys = (await ctx.db.select(ctx.db.metadataEntity).get()).map((r) => r.key);
+      expect(remainingKeys, [MetadataKey.logLevel.key]);
+    });
+  });
+
+  group('refresh', () {
+    test('picks up rows that were inserted directly into the DB', () async {
+      await ctx.db
+          .into(ctx.db.metadataEntity)
+          .insert(
+            MetadataEntityCompanion.insert(
+              key: MetadataKey.themeMode.key,
+              value: ThemeMode.dark.name,
+              updatedAt: Value(DateTime.now()),
+            ),
+          );
+
+      // Cache hasn't seen this row yet — view still returns the default.
+      expect(sut.appConfig.theme.mode, ThemeMode.system);
+
+      await MetadataRepository.refresh();
+
+      expect(sut.appConfig.theme.mode, ThemeMode.dark);
+    });
+
+    test('drops cached values for rows that were deleted out from under the repo', () async {
+      await sut.write(.themeMode, ThemeMode.dark);
+      // Wipe the row directly. Cache still holds the old value.
+      await ctx.db.delete(ctx.db.metadataEntity).go();
+      expect(sut.appConfig.theme.mode, ThemeMode.dark);
+
+      await MetadataRepository.refresh();
+
+      expect(sut.appConfig.theme.mode, ThemeMode.system);
+    });
+
+    test('skips rows whose key is unknown to MetadataKey', () async {
+      await ctx.db
+          .into(ctx.db.metadataEntity)
+          .insert(
+            MetadataEntityCompanion.insert(
+              key: 'app-config.unknown.future-key',
+              value: 'whatever',
+              updatedAt: Value(DateTime.now()),
+            ),
+          );
+
+      await MetadataRepository.refresh();
+      expect(sut.appConfig.theme.mode, ThemeMode.system);
+    });
+  });
+
+  group('watch', () {
+    test('watchAppConfig emits the new value after a write', () async {
+      final expectation = expectLater(sut.watchAppConfig().map((c) => c.theme.mode), emitsThrough(ThemeMode.dark));
+      await sut.write(MetadataKey.themeMode, ThemeMode.dark);
+      await expectation;
+    });
+
+    test('watchAppConfig does not emit when only system-config rows change', () async {
+      final emissions = <ThemeMode>[];
+      // skip(1) drops the on-subscribe replay so we only capture emissions caused by the write below.
+      final sub = sut.watchAppConfig().skip(1).listen((c) => emissions.add(c.theme.mode));
+
+      await sut.write(MetadataKey.logLevel, LogLevel.severe);
+      await pumpEventQueue();
+      await sub.cancel();
+
+      expect(emissions, isEmpty);
+    });
+
+    test('watchSystemConfig emits the new value after a write', () async {
+      final expectation = expectLater(sut.watchSystemConfig().map((c) => c.log.level), emitsThrough(LogLevel.warning));
+      await sut.write(MetadataKey.logLevel, LogLevel.warning);
+      await expectation;
+    });
+  });
+}