feat: opt-in sync of deletes and restores from web to Android (#16732)

* Features: Local file movement to trash and restoration back to the album added. (Android)

* Comments fixes

* settings button marked as [EXPERIMENTAL]

* _moveToTrashMatchedAssets refactored, moveToTrash renamed.

* fix: bad merge

* Permission check and request for local storage added.

* Permission request added on settings switcher

* Settings button logic changed

* Method channel file_trash moved to BackgroundServicePlugin

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/services/sync.service.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:io';
 
 import 'package:collection/collection.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
@@ -16,6 +17,8 @@ import 'package:immich_mobile/interfaces/album_api.interface.dart';
 import 'package:immich_mobile/interfaces/album_media.interface.dart';
 import 'package:immich_mobile/interfaces/asset.interface.dart';
 import 'package:immich_mobile/interfaces/etag.interface.dart';
+import 'package:immich_mobile/interfaces/local_files_manager.interface.dart';
+import 'package:immich_mobile/providers/app_settings.provider.dart';
 import 'package:immich_mobile/interfaces/partner.interface.dart';
 import 'package:immich_mobile/interfaces/partner_api.interface.dart';
 import 'package:immich_mobile/providers/infrastructure/exif.provider.dart';
@@ -25,6 +28,8 @@ import 'package:immich_mobile/repositories/album_api.repository.dart';
 import 'package:immich_mobile/repositories/album_media.repository.dart';
 import 'package:immich_mobile/repositories/asset.repository.dart';
 import 'package:immich_mobile/repositories/etag.repository.dart';
+import 'package:immich_mobile/repositories/local_files_manager.repository.dart';
+import 'package:immich_mobile/services/app_settings.service.dart';
 import 'package:immich_mobile/repositories/partner.repository.dart';
 import 'package:immich_mobile/repositories/partner_api.repository.dart';
 import 'package:immich_mobile/services/entity.service.dart';
@@ -48,6 +53,8 @@ final syncServiceProvider = Provider(
     ref.watch(userRepositoryProvider),
     ref.watch(userServiceProvider),
     ref.watch(etagRepositoryProvider),
+    ref.watch(appSettingsServiceProvider),
+    ref.watch(localFilesManagerRepositoryProvider),
     ref.watch(partnerApiRepositoryProvider),
     ref.watch(userApiRepositoryProvider),
   ),
@@ -69,6 +76,8 @@ class SyncService {
   final IUserApiRepository _userApiRepository;
   final AsyncMutex _lock = AsyncMutex();
   final Logger _log = Logger('SyncService');
+  final AppSettingsService _appSettingsService;
+  final ILocalFilesManager _localFilesManager;
 
   SyncService(
     this._hashService,
@@ -82,6 +91,8 @@ class SyncService {
     this._userRepository,
     this._userService,
     this._eTagRepository,
+    this._appSettingsService,
+    this._localFilesManager,
     this._partnerApiRepository,
     this._userApiRepository,
   );
@@ -238,8 +249,19 @@ class SyncService {
     return null;
   }
 
+  Future<void> _moveToTrashMatchedAssets(Iterable<String> idsToDelete) async {
+    final List<Asset> localAssets = await _assetRepository.getAllLocal();
+    final List<Asset> matchedAssets = localAssets
+        .where((asset) => idsToDelete.contains(asset.remoteId))
+        .toList();
+
+    for (var asset in matchedAssets) {
+      _localFilesManager.moveToTrash(asset.fileName);
+    }
+  }
+
   /// Deletes remote-only assets, updates merged assets to be local-only
-  Future<void> handleRemoteAssetRemoval(List<String> idsToDelete) {
+  Future<void> handleRemoteAssetRemoval(List<String> idsToDelete) async {
     return _assetRepository.transaction(() async {
       await _assetRepository.deleteAllByRemoteId(
         idsToDelete,
@@ -249,6 +271,12 @@ class SyncService {
         idsToDelete,
         state: AssetState.merged,
       );
+      if (Platform.isAndroid &&
+          _appSettingsService.getSetting<bool>(
+            AppSettingsEnum.manageLocalMediaAndroid,
+          )) {
+        await _moveToTrashMatchedAssets(idsToDelete);
+      }
       if (merged.isEmpty) return;
       for (final Asset asset in merged) {
         asset.remoteId = null;
@@ -790,9 +818,27 @@ class SyncService {
     return (existing, toUpsert);
   }
 
+  Future<void> _toggleTrashStatusForAssets(List<Asset> assetsList) async {
+    for (var asset in assetsList) {
+      if (asset.isTrashed) {
+        _localFilesManager.moveToTrash(asset.fileName);
+      } else {
+        _localFilesManager.restoreFromTrash(asset.fileName);
+      }
+    }
+  }
+
   /// Inserts or updates the assets in the database with their ExifInfo (if any)
   Future<void> upsertAssetsWithExif(List<Asset> assets) async {
     if (assets.isEmpty) return;
+
+    if (Platform.isAndroid &&
+        _appSettingsService.getSetting<bool>(
+          AppSettingsEnum.manageLocalMediaAndroid,
+        )) {
+      _toggleTrashStatusForAssets(assets);
+    }
+
     final exifInfos = assets.map((e) => e.exifInfo).nonNulls.toList();
     try {
       await _assetRepository.transaction(() async {