Port starting exif service

app/lib/widget/home_photos/bloc.dart

@@ -9,6 +9,7 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
     required this.prefController,
     required this.accountPrefController,
     required this.collectionsController,
+    required this.sessionController,
   }) : super(_State.init(
           zoom: prefController.homePhotosZoomLevel.value,
           isEnableMemoryCollection:
@@ -38,6 +39,7 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
     on<_SetEnableMemoryCollection>(_onSetEnableMemoryCollection);
     on<_SetSortByName>(_onSetSortByName);
     on<_SetMemoriesRange>(_onSetMemoriesRange);
+    on<_SetEnableExif>(_onSetEnableExif);
     on<_UpdateDateTimeGroup>(_onUpdateDateTimeGroup);
 
     on<_SetError>(_onSetError);
@@ -52,6 +54,9 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
     _subscriptions.add(prefController.memoriesRange.listen((event) {
       add(_SetMemoriesRange(event));
     }));
+    _subscriptions.add(prefController.isEnableExif.listen((event) {
+      add(_SetEnableExif(event));
+    }));
   }
 
   @override
@@ -130,6 +135,7 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
       memoryCollections: ev.memoryCollections,
       isLoading: _itemTransformerQueue.isProcessing,
     ));
+    _tryStartMetadataTask();
   }
 
   void _onSetSelectedItems(_SetSelectedItems ev, Emitter<_State> emit) {
@@ -277,6 +283,15 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
     _transformItems(state.files);
   }
 
+  void _onSetEnableExif(_SetEnableExif ev, Emitter<_State> emit) {
+    _log.info(ev);
+    if (ev.value) {
+      _tryStartMetadataTask(ignoreFired: true);
+    } else {
+      _stopMetadataTask();
+    }
+  }
+
   void _onUpdateDateTimeGroup(_UpdateDateTimeGroup ev, Emitter<_State> emit) {
     _log.info(ev);
     _transformItems(state.files);
@@ -331,12 +346,43 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
     emit(state.copyWith(selectedItems: const {}));
   }
 
+  Future<void> _tryStartMetadataTask({
+    bool ignoreFired = false,
+  }) async {
+    if (state.files.isNotEmpty &&
+        prefController.isEnableExif.value &&
+        (ignoreFired || !sessionController.hasFiredMetadataTask.value)) {
+      sessionController.setFiredMetadataTask(true);
+      try {
+        final missingMetadataCount =
+            await _c.npDb.countFilesByFileIdsMissingMetadata(
+          account: account.toDb(),
+          fileIds: state.files.map((e) => e.fdId).toList(),
+          mimes: file_util.supportedImageFormatMimes,
+        );
+        _log.info(
+            "[_tryStartMetadataTask] Missing count: $missingMetadataCount");
+        if (missingMetadataCount > 0) {
+          unawaited(service.startService());
+        }
+      } catch (e, stackTrace) {
+        _log.shout("[_tryStartMetadataTask] Failed starting metadata task", e,
+            stackTrace);
+      }
+    }
+  }
+
+  void _stopMetadataTask() {
+    service.stopService();
+  }
+
   final DiContainer _c;
   final Account account;
   final FilesController controller;
   final PrefController prefController;
   final AccountPrefController accountPrefController;
   final CollectionsController collectionsController;
+  final SessionController sessionController;
 
   final _itemTransformerQueue =
       ComputeQueue<_ItemTransformerArgument, _ItemTransformerResult>();

app/lib/widget/home_photos/state_event.dart

@@ -238,6 +238,16 @@ class _SetMemoriesRange implements _Event {
   final int value;
 }
 
+@toString
+class _SetEnableExif implements _Event {
+  const _SetEnableExif(this.value);
+
+  @override
+  String toString() => _$toString();
+
+  final bool value;
+}
+
 @toString
 class _UpdateDateTimeGroup implements _Event {
   const _UpdateDateTimeGroup();

app/lib/widget/home_photos2.dart

@@ -19,6 +19,8 @@ import 'package:nc_photos/controller/account_pref_controller.dart';
 import 'package:nc_photos/controller/collections_controller.dart';
 import 'package:nc_photos/controller/files_controller.dart';
 import 'package:nc_photos/controller/pref_controller.dart';
+import 'package:nc_photos/controller/session_controller.dart';
+import 'package:nc_photos/db/entity_converter.dart';
 import 'package:nc_photos/di_container.dart';
 import 'package:nc_photos/download_handler.dart';
 import 'package:nc_photos/entity/collection.dart';
@@ -31,6 +33,7 @@ import 'package:nc_photos/flutter_util.dart' as flutter_util;
 import 'package:nc_photos/k.dart' as k;
 import 'package:nc_photos/language_util.dart' as language_util;
 import 'package:nc_photos/progress_util.dart';
+import 'package:nc_photos/service.dart' as service;
 import 'package:nc_photos/snack_bar_manager.dart';
 import 'package:nc_photos/theme.dart';
 import 'package:nc_photos/theme/dimension.dart';
@@ -80,6 +83,7 @@ class HomePhotos2 extends StatelessWidget {
         prefController: context.read(),
         accountPrefController: accountController.accountPrefController,
         collectionsController: accountController.collectionsController,
+        sessionController: accountController.sessionController,
       ),
       child: const _WrappedHomePhotos(),
     );

app/lib/widget/home_photos2.g.dart

@@ -273,6 +273,13 @@ extension _$_SetMemoriesRangeToString on _SetMemoriesRange {
   }
 }
 
+extension _$_SetEnableExifToString on _SetEnableExif {
+  String _$toString() {
+    // ignore: unnecessary_string_interpolations
+    return "_SetEnableExif {value: $value}";
+  }
+}
+
 extension _$_UpdateDateTimeGroupToString on _UpdateDateTimeGroup {
   String _$toString() {
     // ignore: unnecessary_string_interpolations