feat(mobile): hash assets in isolate (#18924)

mobile/analysis_options.yaml

@@ -56,6 +56,7 @@ custom_lint:
       allowed:
         # required / wanted
         - 'lib/infrastructure/repositories/album_media.repository.dart'
+        - 'lib/infrastructure/repositories/storage.repository.dart'
         - 'lib/repositories/{album,asset,file}_media.repository.dart'
         # acceptable exceptions for the time being
         - lib/entities/asset.entity.dart # to provide local AssetEntity for now

mobile/android/app/src/main/kotlin/app/alextran/immich/sync/Messages.g.kt

@@ -247,6 +247,7 @@ interface NativeSyncApi {
   fun getAlbums(): List<PlatformAlbum>
   fun getAssetsCountSince(albumId: String, timestamp: Long): Long
   fun getAssetsForAlbum(albumId: String, updatedTimeCond: Long?): List<PlatformAsset>
+  fun hashPaths(paths: List<String>): List<ByteArray?>
 
   companion object {
     /** The codec used by NativeSyncApi. */
@@ -388,6 +389,23 @@ interface NativeSyncApi {
           channel.setMessageHandler(null)
         }
       }
+      run {
+        val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.immich_mobile.NativeSyncApi.hashPaths$separatedMessageChannelSuffix", codec, taskQueue)
+        if (api != null) {
+          channel.setMessageHandler { message, reply ->
+            val args = message as List<Any?>
+            val pathsArg = args[0] as List<String>
+            val wrapped: List<Any?> = try {
+              listOf(api.hashPaths(pathsArg))
+            } catch (exception: Throwable) {
+              MessagesPigeonUtils.wrapError(exception)
+            }
+            reply.reply(wrapped)
+          }
+        } else {
+          channel.setMessageHandler(null)
+        }
+      }
     }
   }
 }

mobile/android/app/src/main/kotlin/app/alextran/immich/sync/MessagesImplBase.kt

@@ -4,7 +4,10 @@ import android.annotation.SuppressLint
 import android.content.Context
 import android.database.Cursor
 import android.provider.MediaStore
+import android.util.Log
 import java.io.File
+import java.io.FileInputStream
+import java.security.MessageDigest
 
 sealed class AssetResult {
   data class ValidAsset(val asset: PlatformAsset, val albumId: String) : AssetResult()
@@ -16,6 +19,8 @@ open class NativeSyncApiImplBase(context: Context) {
   private val ctx: Context = context.applicationContext
 
   companion object {
+    private const val TAG = "NativeSyncApiImplBase"
+
     const val MEDIA_SELECTION =
       "(${MediaStore.Files.FileColumns.MEDIA_TYPE} = ? OR ${MediaStore.Files.FileColumns.MEDIA_TYPE} = ?)"
     val MEDIA_SELECTION_ARGS = arrayOf(
@@ -34,6 +39,8 @@ open class NativeSyncApiImplBase(context: Context) {
       MediaStore.MediaColumns.BUCKET_ID,
       MediaStore.MediaColumns.DURATION
     )
+
+    const val HASH_BUFFER_SIZE = 2 * 1024 * 1024
   }
 
   protected fun getCursor(
@@ -174,4 +181,24 @@ open class NativeSyncApiImplBase(context: Context) {
       .mapNotNull { result -> (result as? AssetResult.ValidAsset)?.asset }
       .toList()
   }
+
+  fun hashPaths(paths: List<String>): List<ByteArray?> {
+    val buffer = ByteArray(HASH_BUFFER_SIZE)
+    val digest = MessageDigest.getInstance("SHA-1")
+
+    return paths.map { path ->
+      try {
+        FileInputStream(path).use { file ->
+          var bytesRead: Int
+          while (file.read(buffer).also { bytesRead = it } > 0) {
+            digest.update(buffer, 0, bytesRead)
+          }
+        }
+        digest.digest()
+      } catch (e: Exception) {
+        Log.w(TAG, "Failed to hash file $path: $e")
+        null
+      }
+    }
+  }
 }

mobile/ios/Runner/Sync/Messages.g.swift

@@ -307,6 +307,7 @@ protocol NativeSyncApi {
   func getAlbums() throws -> [PlatformAlbum]
   func getAssetsCountSince(albumId: String, timestamp: Int64) throws -> Int64
   func getAssetsForAlbum(albumId: String, updatedTimeCond: Int64?) throws -> [PlatformAsset]
+  func hashPaths(paths: [String]) throws -> [FlutterStandardTypedData?]
 }
 
 /// Generated setup class from Pigeon to handle messages through the `binaryMessenger`.
@@ -442,5 +443,22 @@ class NativeSyncApiSetup {
     } else {
       getAssetsForAlbumChannel.setMessageHandler(nil)
     }
+    let hashPathsChannel = taskQueue == nil
+      ? FlutterBasicMessageChannel(name: "dev.flutter.pigeon.immich_mobile.NativeSyncApi.hashPaths\(channelSuffix)", binaryMessenger: binaryMessenger, codec: codec)
+      : FlutterBasicMessageChannel(name: "dev.flutter.pigeon.immich_mobile.NativeSyncApi.hashPaths\(channelSuffix)", binaryMessenger: binaryMessenger, codec: codec, taskQueue: taskQueue)
+    if let api = api {
+      hashPathsChannel.setMessageHandler { message, reply in
+        let args = message as! [Any?]
+        let pathsArg = args[0] as! [String]
+        do {
+          let result = try api.hashPaths(paths: pathsArg)
+          reply(wrapResult(result))
+        } catch {
+          reply(wrapError(error))
+        }
+      }
+    } else {
+      hashPathsChannel.setMessageHandler(nil)
+    }
   }
 }

mobile/ios/Runner/Sync/MessagesImpl.swift

@@ -1,4 +1,5 @@
 import Photos
+import CryptoKit
 
 struct AssetWrapper: Hashable, Equatable {
   let asset: PlatformAsset
@@ -34,6 +35,8 @@ class NativeSyncApiImpl: NativeSyncApi {
   private let changeTokenKey = "immich:changeToken"
   private let albumTypes: [PHAssetCollectionType] = [.album, .smartAlbum]
   
+  private let hashBufferSize = 2 * 1024 * 1024
+  
   init(with defaults: UserDefaults = .standard) {
     self.defaults = defaults
   }
@@ -243,4 +246,24 @@ class NativeSyncApiImpl: NativeSyncApi {
     }
     return assets
   }
+  
+  func hashPaths(paths: [String]) throws -> [FlutterStandardTypedData?] {
+      return paths.map { path in
+          guard let file = FileHandle(forReadingAtPath: path) else {
+              print("Cannot open file: \(path)")
+              return nil
+          }
+          
+          var hasher = Insecure.SHA1()
+          while autoreleasepool(invoking: {
+              let chunk = file.readData(ofLength: hashBufferSize)
+              guard !chunk.isEmpty else { return false }
+              hasher.update(data: chunk)
+              return true
+          }) { }
+          
+          let digest = hasher.finalize()
+          return FlutterStandardTypedData(bytes: Data(digest))
+      }
+  }
 }

mobile/lib/domain/interfaces/local_album.interface.dart

@@ -29,6 +29,8 @@ abstract interface class ILocalAlbumRepository implements IDatabaseRepository {
     String albumId,
     Iterable<String> assetIdsToKeep,
   );
+
+  Future<List<LocalAsset>> getAssetsToHash(String albumId);
 }
 
 enum SortLocalAlbumsBy { id }

mobile/lib/domain/interfaces/local_asset.interface.dart

@@ -0,0 +1,6 @@
+import 'package:immich_mobile/domain/interfaces/db.interface.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+
+abstract interface class ILocalAssetRepository implements IDatabaseRepository {
+  Future<void> updateHashes(Iterable<LocalAsset> hashes);
+}

mobile/lib/domain/interfaces/storage.interface.dart

@@ -0,0 +1,7 @@
+import 'dart:io';
+
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+
+abstract interface class IStorageRepository {
+  Future<File?> getFileForAsset(LocalAsset asset);
+}

mobile/lib/domain/models/local_album.model.dart

@@ -1,13 +1,19 @@
 enum BackupSelection {
-  none,
+  none._(1),
-  selected,
+  selected._(0),
-  excluded,
+  excluded._(2);
+
+  // Used to sort albums based on the backupSelection
+  // selected -> none -> excluded
+  final int sortOrder;
+  const BackupSelection._(this.sortOrder);
 }
 
 class LocalAlbum {
   final String id;
   final String name;
   final DateTime updatedAt;
+  final bool isIosSharedAlbum;
 
   final int assetCount;
   final BackupSelection backupSelection;
@@ -18,6 +24,7 @@ class LocalAlbum {
     required this.updatedAt,
     this.assetCount = 0,
     this.backupSelection = BackupSelection.none,
+    this.isIosSharedAlbum = false,
   });
 
   LocalAlbum copyWith({
@@ -26,6 +33,7 @@ class LocalAlbum {
     DateTime? updatedAt,
     int? assetCount,
     BackupSelection? backupSelection,
+    bool? isIosSharedAlbum,
   }) {
     return LocalAlbum(
       id: id ?? this.id,
@@ -33,6 +41,7 @@ class LocalAlbum {
       updatedAt: updatedAt ?? this.updatedAt,
       assetCount: assetCount ?? this.assetCount,
       backupSelection: backupSelection ?? this.backupSelection,
+      isIosSharedAlbum: isIosSharedAlbum ?? this.isIosSharedAlbum,
     );
   }
 
@@ -45,7 +54,8 @@ class LocalAlbum {
         other.name == name &&
         other.updatedAt == updatedAt &&
         other.assetCount == assetCount &&
-        other.backupSelection == backupSelection;
+        other.backupSelection == backupSelection &&
+        other.isIosSharedAlbum == isIosSharedAlbum;
   }
 
   @override
@@ -54,7 +64,8 @@ class LocalAlbum {
         name.hashCode ^
         updatedAt.hashCode ^
         assetCount.hashCode ^
-        backupSelection.hashCode;
+        backupSelection.hashCode ^
+        isIosSharedAlbum.hashCode;
   }
 
   @override
@@ -65,6 +76,7 @@ name: $name,
 updatedAt: $updatedAt,
 assetCount: $assetCount,
 backupSelection: $backupSelection,
+isIosSharedAlbum: $isIosSharedAlbum
 }''';
   }
 }

mobile/lib/domain/services/hash.service.dart

@@ -0,0 +1,121 @@
+import 'dart:convert';
+
+import 'package:immich_mobile/constants/constants.dart';
+import 'package:immich_mobile/domain/interfaces/local_album.interface.dart';
+import 'package:immich_mobile/domain/interfaces/local_asset.interface.dart';
+import 'package:immich_mobile/domain/interfaces/storage.interface.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/platform/native_sync_api.g.dart';
+import 'package:immich_mobile/presentation/pages/dev/dev_logger.dart';
+import 'package:logging/logging.dart';
+
+class HashService {
+  final int batchSizeLimit;
+  final int batchFileLimit;
+  final ILocalAlbumRepository _localAlbumRepository;
+  final ILocalAssetRepository _localAssetRepository;
+  final IStorageRepository _storageRepository;
+  final NativeSyncApi _nativeSyncApi;
+  final _log = Logger('HashService');
+
+  HashService({
+    required ILocalAlbumRepository localAlbumRepository,
+    required ILocalAssetRepository localAssetRepository,
+    required IStorageRepository storageRepository,
+    required NativeSyncApi nativeSyncApi,
+    this.batchSizeLimit = kBatchHashSizeLimit,
+    this.batchFileLimit = kBatchHashFileLimit,
+  })  : _localAlbumRepository = localAlbumRepository,
+        _localAssetRepository = localAssetRepository,
+        _storageRepository = storageRepository,
+        _nativeSyncApi = nativeSyncApi;
+
+  Future<void> hashAssets() async {
+    final Stopwatch stopwatch = Stopwatch()..start();
+    // Sorted by backupSelection followed by isCloud
+    final localAlbums = await _localAlbumRepository.getAll();
+    localAlbums.sort((a, b) {
+      final backupComparison =
+          a.backupSelection.sortOrder.compareTo(b.backupSelection.sortOrder);
+
+      if (backupComparison != 0) {
+        return backupComparison;
+      }
+
+      // Local albums come before iCloud albums
+      return (a.isIosSharedAlbum ? 1 : 0).compareTo(b.isIosSharedAlbum ? 1 : 0);
+    });
+
+    for (final album in localAlbums) {
+      final assetsToHash =
+          await _localAlbumRepository.getAssetsToHash(album.id);
+      if (assetsToHash.isNotEmpty) {
+        await _hashAssets(assetsToHash);
+      }
+    }
+
+    stopwatch.stop();
+    _log.info("Hashing took - ${stopwatch.elapsedMilliseconds}ms");
+    DLog.log("Hashing took - ${stopwatch.elapsedMilliseconds}ms");
+  }
+
+  /// Processes a list of [LocalAsset]s, storing their hash and updating the assets in the DB
+  /// with hash for those that were successfully hashed. Hashes are looked up in a table
+  /// [LocalAssetHashEntity] by local id. Only missing entries are newly hashed and added to the DB.
+  Future<void> _hashAssets(List<LocalAsset> assetsToHash) async {
+    int bytesProcessed = 0;
+    final toHash = <_AssetToPath>[];
+
+    for (final asset in assetsToHash) {
+      final file = await _storageRepository.getFileForAsset(asset);
+      if (file == null) {
+        continue;
+      }
+
+      bytesProcessed += await file.length();
+      toHash.add(_AssetToPath(asset: asset, path: file.path));
+
+      if (toHash.length >= batchFileLimit || bytesProcessed >= batchSizeLimit) {
+        await _processBatch(toHash);
+        toHash.clear();
+        bytesProcessed = 0;
+      }
+    }
+
+    await _processBatch(toHash);
+  }
+
+  /// Processes a batch of assets.
+  Future<void> _processBatch(List<_AssetToPath> toHash) async {
+    if (toHash.isEmpty) {
+      return;
+    }
+
+    _log.fine("Hashing ${toHash.length} files");
+
+    final hashed = <LocalAsset>[];
+    final hashes =
+        await _nativeSyncApi.hashPaths(toHash.map((e) => e.path).toList());
+
+    for (final (index, hash) in hashes.indexed) {
+      final asset = toHash[index].asset;
+      if (hash?.length == 20) {
+        hashed.add(asset.copyWith(checksum: base64.encode(hash!)));
+      } else {
+        _log.warning("Failed to hash file ${asset.id}");
+      }
+    }
+
+    _log.fine("Hashed ${hashed.length}/${toHash.length} assets");
+    DLog.log("Hashed ${hashed.length}/${toHash.length} assets");
+
+    await _localAssetRepository.updateHashes(hashed);
+  }
+}
+
+class _AssetToPath {
+  final LocalAsset asset;
+  final String path;
+
+  const _AssetToPath({required this.asset, required this.path});
+}

mobile/lib/domain/services/local_sync.service.dart

@@ -365,6 +365,7 @@ extension on Iterable<PlatformAsset> {
       (e) => LocalAsset(
         id: e.id,
         name: e.name,
+        checksum: null,
         type: AssetType.values.elementAtOrNull(e.type) ?? AssetType.other,
         createdAt: e.createdAt == null
             ? DateTime.now()

mobile/lib/domain/utils/background_sync.dart

@@ -7,6 +7,7 @@ import 'package:worker_manager/worker_manager.dart';
 class BackgroundSyncManager {
   Cancelable<void>? _syncTask;
   Cancelable<void>? _deviceAlbumSyncTask;
+  Cancelable<void>? _hashTask;
 
   BackgroundSyncManager();
 
@@ -45,6 +46,20 @@ class BackgroundSyncManager {
     });
   }
 
+// No need to cancel the task, as it can also be run when the user logs out
+  Future<void> hashAssets() {
+    if (_hashTask != null) {
+      return _hashTask!.future;
+    }
+
+    _hashTask = runInIsolateGentle(
+      computation: (ref) => ref.read(hashServiceProvider).hashAssets(),
+    );
+    return _hashTask!.whenComplete(() {
+      _hashTask = null;
+    });
+  }
+
   Future<void> syncRemote() {
     if (_syncTask != null) {
       return _syncTask!.future;

mobile/lib/infrastructure/entities/local_album.entity.dart

@@ -9,6 +9,8 @@ class LocalAlbumEntity extends Table with DriftDefaultsMixin {
   TextColumn get name => text()();
   DateTimeColumn get updatedAt => dateTime().withDefault(currentDateAndTime)();
   IntColumn get backupSelection => intEnum<BackupSelection>()();
+  BoolColumn get isIosSharedAlbum =>
+      boolean().withDefault(const Constant(false))();
 
   // Used for mark & sweep
   BoolColumn get marker_ => boolean().nullable()();

mobile/lib/infrastructure/entities/local_album.entity.drift.dart

@@ -14,6 +14,7 @@ typedef $$LocalAlbumEntityTableCreateCompanionBuilder
   required String name,
   i0.Value<DateTime> updatedAt,
   required i2.BackupSelection backupSelection,
+  i0.Value<bool> isIosSharedAlbum,
   i0.Value<bool?> marker_,
 });
 typedef $$LocalAlbumEntityTableUpdateCompanionBuilder
@@ -22,6 +23,7 @@ typedef $$LocalAlbumEntityTableUpdateCompanionBuilder
   i0.Value<String> name,
   i0.Value<DateTime> updatedAt,
   i0.Value<i2.BackupSelection> backupSelection,
+  i0.Value<bool> isIosSharedAlbum,
   i0.Value<bool?> marker_,
 });
 
@@ -48,6 +50,10 @@ class $$LocalAlbumEntityTableFilterComposer
           column: $table.backupSelection,
           builder: (column) => i0.ColumnWithTypeConverterFilters(column));
 
+  i0.ColumnFilters<bool> get isIosSharedAlbum => $composableBuilder(
+      column: $table.isIosSharedAlbum,
+      builder: (column) => i0.ColumnFilters(column));
+
   i0.ColumnFilters<bool> get marker_ => $composableBuilder(
       column: $table.marker_, builder: (column) => i0.ColumnFilters(column));
 }
@@ -75,6 +81,10 @@ class $$LocalAlbumEntityTableOrderingComposer
       column: $table.backupSelection,
       builder: (column) => i0.ColumnOrderings(column));
 
+  i0.ColumnOrderings<bool> get isIosSharedAlbum => $composableBuilder(
+      column: $table.isIosSharedAlbum,
+      builder: (column) => i0.ColumnOrderings(column));
+
   i0.ColumnOrderings<bool> get marker_ => $composableBuilder(
       column: $table.marker_, builder: (column) => i0.ColumnOrderings(column));
 }
@@ -101,6 +111,9 @@ class $$LocalAlbumEntityTableAnnotationComposer
       get backupSelection => $composableBuilder(
           column: $table.backupSelection, builder: (column) => column);
 
+  i0.GeneratedColumn<bool> get isIosSharedAlbum => $composableBuilder(
+      column: $table.isIosSharedAlbum, builder: (column) => column);
+
   i0.GeneratedColumn<bool> get marker_ =>
       $composableBuilder(column: $table.marker_, builder: (column) => column);
 }
@@ -139,6 +152,7 @@ class $$LocalAlbumEntityTableTableManager extends i0.RootTableManager<
             i0.Value<DateTime> updatedAt = const i0.Value.absent(),
             i0.Value<i2.BackupSelection> backupSelection =
                 const i0.Value.absent(),
+            i0.Value<bool> isIosSharedAlbum = const i0.Value.absent(),
             i0.Value<bool?> marker_ = const i0.Value.absent(),
           }) =>
               i1.LocalAlbumEntityCompanion(
@@ -146,6 +160,7 @@ class $$LocalAlbumEntityTableTableManager extends i0.RootTableManager<
             name: name,
             updatedAt: updatedAt,
             backupSelection: backupSelection,
+            isIosSharedAlbum: isIosSharedAlbum,
             marker_: marker_,
           ),
           createCompanionCallback: ({
@@ -153,6 +168,7 @@ class $$LocalAlbumEntityTableTableManager extends i0.RootTableManager<
             required String name,
             i0.Value<DateTime> updatedAt = const i0.Value.absent(),
             required i2.BackupSelection backupSelection,
+            i0.Value<bool> isIosSharedAlbum = const i0.Value.absent(),
             i0.Value<bool?> marker_ = const i0.Value.absent(),
           }) =>
               i1.LocalAlbumEntityCompanion.insert(
@@ -160,6 +176,7 @@ class $$LocalAlbumEntityTableTableManager extends i0.RootTableManager<
             name: name,
             updatedAt: updatedAt,
             backupSelection: backupSelection,
+            isIosSharedAlbum: isIosSharedAlbum,
             marker_: marker_,
           ),
           withReferenceMapper: (p0) => p0
@@ -218,6 +235,16 @@ class $LocalAlbumEntityTable extends i3.LocalAlbumEntity
               type: i0.DriftSqlType.int, requiredDuringInsert: true)
           .withConverter<i2.BackupSelection>(
               i1.$LocalAlbumEntityTable.$converterbackupSelection);
+  static const i0.VerificationMeta _isIosSharedAlbumMeta =
+      const i0.VerificationMeta('isIosSharedAlbum');
+  @override
+  late final i0.GeneratedColumn<bool> isIosSharedAlbum =
+      i0.GeneratedColumn<bool>('is_ios_shared_album', aliasedName, false,
+          type: i0.DriftSqlType.bool,
+          requiredDuringInsert: false,
+          defaultConstraints: i0.GeneratedColumn.constraintIsAlways(
+              'CHECK ("is_ios_shared_album" IN (0, 1))'),
+          defaultValue: const i4.Constant(false));
   static const i0.VerificationMeta _marker_Meta =
       const i0.VerificationMeta('marker_');
   @override
@@ -229,7 +256,7 @@ class $LocalAlbumEntityTable extends i3.LocalAlbumEntity
           i0.GeneratedColumn.constraintIsAlways('CHECK ("marker" IN (0, 1))'));
   @override
   List<i0.GeneratedColumn> get $columns =>
-      [id, name, updatedAt, backupSelection, marker_];
+      [id, name, updatedAt, backupSelection, isIosSharedAlbum, marker_];
   @override
   String get aliasedName => _alias ?? actualTableName;
   @override
@@ -256,6 +283,12 @@ class $LocalAlbumEntityTable extends i3.LocalAlbumEntity
       context.handle(_updatedAtMeta,
           updatedAt.isAcceptableOrUnknown(data['updated_at']!, _updatedAtMeta));
     }
+    if (data.containsKey('is_ios_shared_album')) {
+      context.handle(
+          _isIosSharedAlbumMeta,
+          isIosSharedAlbum.isAcceptableOrUnknown(
+              data['is_ios_shared_album']!, _isIosSharedAlbumMeta));
+    }
     if (data.containsKey('marker')) {
       context.handle(_marker_Meta,
           marker_.isAcceptableOrUnknown(data['marker']!, _marker_Meta));
@@ -279,6 +312,8 @@ class $LocalAlbumEntityTable extends i3.LocalAlbumEntity
       backupSelection: i1.$LocalAlbumEntityTable.$converterbackupSelection
           .fromSql(attachedDatabase.typeMapping.read(i0.DriftSqlType.int,
               data['${effectivePrefix}backup_selection'])!),
+      isIosSharedAlbum: attachedDatabase.typeMapping.read(
+          i0.DriftSqlType.bool, data['${effectivePrefix}is_ios_shared_album'])!,
       marker_: attachedDatabase.typeMapping
           .read(i0.DriftSqlType.bool, data['${effectivePrefix}marker']),
     );
@@ -305,12 +340,14 @@ class LocalAlbumEntityData extends i0.DataClass
   final String name;
   final DateTime updatedAt;
   final i2.BackupSelection backupSelection;
+  final bool isIosSharedAlbum;
   final bool? marker_;
   const LocalAlbumEntityData(
       {required this.id,
       required this.name,
       required this.updatedAt,
       required this.backupSelection,
+      required this.isIosSharedAlbum,
       this.marker_});
   @override
   Map<String, i0.Expression> toColumns(bool nullToAbsent) {
@@ -323,6 +360,7 @@ class LocalAlbumEntityData extends i0.DataClass
           .$LocalAlbumEntityTable.$converterbackupSelection
           .toSql(backupSelection));
     }
+    map['is_ios_shared_album'] = i0.Variable<bool>(isIosSharedAlbum);
     if (!nullToAbsent || marker_ != null) {
       map['marker'] = i0.Variable<bool>(marker_);
     }
@@ -338,6 +376,7 @@ class LocalAlbumEntityData extends i0.DataClass
       updatedAt: serializer.fromJson<DateTime>(json['updatedAt']),
       backupSelection: i1.$LocalAlbumEntityTable.$converterbackupSelection
           .fromJson(serializer.fromJson<int>(json['backupSelection'])),
+      isIosSharedAlbum: serializer.fromJson<bool>(json['isIosSharedAlbum']),
       marker_: serializer.fromJson<bool?>(json['marker_']),
     );
   }
@@ -351,6 +390,7 @@ class LocalAlbumEntityData extends i0.DataClass
       'backupSelection': serializer.toJson<int>(i1
           .$LocalAlbumEntityTable.$converterbackupSelection
           .toJson(backupSelection)),
+      'isIosSharedAlbum': serializer.toJson<bool>(isIosSharedAlbum),
       'marker_': serializer.toJson<bool?>(marker_),
     };
   }
@@ -360,12 +400,14 @@ class LocalAlbumEntityData extends i0.DataClass
           String? name,
           DateTime? updatedAt,
           i2.BackupSelection? backupSelection,
+          bool? isIosSharedAlbum,
           i0.Value<bool?> marker_ = const i0.Value.absent()}) =>
       i1.LocalAlbumEntityData(
         id: id ?? this.id,
         name: name ?? this.name,
         updatedAt: updatedAt ?? this.updatedAt,
         backupSelection: backupSelection ?? this.backupSelection,
+        isIosSharedAlbum: isIosSharedAlbum ?? this.isIosSharedAlbum,
         marker_: marker_.present ? marker_.value : this.marker_,
       );
   LocalAlbumEntityData copyWithCompanion(i1.LocalAlbumEntityCompanion data) {
@@ -376,6 +418,9 @@ class LocalAlbumEntityData extends i0.DataClass
       backupSelection: data.backupSelection.present
           ? data.backupSelection.value
           : this.backupSelection,
+      isIosSharedAlbum: data.isIosSharedAlbum.present
+          ? data.isIosSharedAlbum.value
+          : this.isIosSharedAlbum,
       marker_: data.marker_.present ? data.marker_.value : this.marker_,
     );
   }
@@ -387,14 +432,15 @@ class LocalAlbumEntityData extends i0.DataClass
           ..write('name: $name, ')
           ..write('updatedAt: $updatedAt, ')
           ..write('backupSelection: $backupSelection, ')
+          ..write('isIosSharedAlbum: $isIosSharedAlbum, ')
           ..write('marker_: $marker_')
           ..write(')'))
         .toString();
   }
 
   @override
-  int get hashCode =>
+  int get hashCode => Object.hash(
-      Object.hash(id, name, updatedAt, backupSelection, marker_);
+      id, name, updatedAt, backupSelection, isIosSharedAlbum, marker_);
   @override
   bool operator ==(Object other) =>
       identical(this, other) ||
@@ -403,6 +449,7 @@ class LocalAlbumEntityData extends i0.DataClass
           other.name == this.name &&
           other.updatedAt == this.updatedAt &&
           other.backupSelection == this.backupSelection &&
+          other.isIosSharedAlbum == this.isIosSharedAlbum &&
           other.marker_ == this.marker_);
 }
 
@@ -412,12 +459,14 @@ class LocalAlbumEntityCompanion
   final i0.Value<String> name;
   final i0.Value<DateTime> updatedAt;
   final i0.Value<i2.BackupSelection> backupSelection;
+  final i0.Value<bool> isIosSharedAlbum;
   final i0.Value<bool?> marker_;
   const LocalAlbumEntityCompanion({
     this.id = const i0.Value.absent(),
     this.name = const i0.Value.absent(),
     this.updatedAt = const i0.Value.absent(),
     this.backupSelection = const i0.Value.absent(),
+    this.isIosSharedAlbum = const i0.Value.absent(),
     this.marker_ = const i0.Value.absent(),
   });
   LocalAlbumEntityCompanion.insert({
@@ -425,6 +474,7 @@ class LocalAlbumEntityCompanion
     required String name,
     this.updatedAt = const i0.Value.absent(),
     required i2.BackupSelection backupSelection,
+    this.isIosSharedAlbum = const i0.Value.absent(),
     this.marker_ = const i0.Value.absent(),
   })  : id = i0.Value(id),
         name = i0.Value(name),
@@ -434,6 +484,7 @@ class LocalAlbumEntityCompanion
     i0.Expression<String>? name,
     i0.Expression<DateTime>? updatedAt,
     i0.Expression<int>? backupSelection,
+    i0.Expression<bool>? isIosSharedAlbum,
     i0.Expression<bool>? marker_,
   }) {
     return i0.RawValuesInsertable({
@@ -441,6 +492,7 @@ class LocalAlbumEntityCompanion
       if (name != null) 'name': name,
       if (updatedAt != null) 'updated_at': updatedAt,
       if (backupSelection != null) 'backup_selection': backupSelection,
+      if (isIosSharedAlbum != null) 'is_ios_shared_album': isIosSharedAlbum,
       if (marker_ != null) 'marker': marker_,
     });
   }
@@ -450,12 +502,14 @@ class LocalAlbumEntityCompanion
       i0.Value<String>? name,
       i0.Value<DateTime>? updatedAt,
       i0.Value<i2.BackupSelection>? backupSelection,
+      i0.Value<bool>? isIosSharedAlbum,
       i0.Value<bool?>? marker_}) {
     return i1.LocalAlbumEntityCompanion(
       id: id ?? this.id,
       name: name ?? this.name,
       updatedAt: updatedAt ?? this.updatedAt,
       backupSelection: backupSelection ?? this.backupSelection,
+      isIosSharedAlbum: isIosSharedAlbum ?? this.isIosSharedAlbum,
       marker_: marker_ ?? this.marker_,
     );
   }
@@ -477,6 +531,9 @@ class LocalAlbumEntityCompanion
           .$LocalAlbumEntityTable.$converterbackupSelection
           .toSql(backupSelection.value));
     }
+    if (isIosSharedAlbum.present) {
+      map['is_ios_shared_album'] = i0.Variable<bool>(isIosSharedAlbum.value);
+    }
     if (marker_.present) {
       map['marker'] = i0.Variable<bool>(marker_.value);
     }
@@ -490,6 +547,7 @@ class LocalAlbumEntityCompanion
           ..write('name: $name, ')
           ..write('updatedAt: $updatedAt, ')
           ..write('backupSelection: $backupSelection, ')
+          ..write('isIosSharedAlbum: $isIosSharedAlbum, ')
           ..write('marker_: $marker_')
           ..write(')'))
         .toString();

mobile/lib/infrastructure/repositories/local_album.repository.dart

@@ -98,12 +98,24 @@ class DriftLocalAlbumRepository extends DriftDatabaseRepository
       name: localAlbum.name,
       updatedAt: Value(localAlbum.updatedAt),
       backupSelection: localAlbum.backupSelection,
+      isIosSharedAlbum: Value(localAlbum.isIosSharedAlbum),
     );
 
     return _db.transaction(() async {
       await _db.localAlbumEntity
           .insertOne(companion, onConflict: DoUpdate((_) => companion));
-      await _addAssets(localAlbum.id, toUpsert);
+      if (toUpsert.isNotEmpty) {
+        await _upsertAssets(toUpsert);
+        await _db.localAlbumAssetEntity.insertAll(
+          toUpsert.map(
+            (a) => LocalAlbumAssetEntityCompanion.insert(
+              assetId: a.id,
+              albumId: localAlbum.id,
+            ),
+          ),
+          mode: InsertMode.insertOrIgnore,
+        );
+      }
       await _removeAssets(localAlbum.id, toDelete);
     });
   }
@@ -122,6 +134,7 @@ class DriftLocalAlbumRepository extends DriftDatabaseRepository
             name: album.name,
             updatedAt: Value(album.updatedAt),
             backupSelection: album.backupSelection,
+            isIosSharedAlbum: Value(album.isIosSharedAlbum),
             marker_: const Value(null),
           );
 
@@ -226,21 +239,52 @@ class DriftLocalAlbumRepository extends DriftDatabaseRepository
     });
   }
 
-  Future<void> _addAssets(String albumId, Iterable<LocalAsset> assets) {
+  @override
-    if (assets.isEmpty) {
+  Future<List<LocalAsset>> getAssetsToHash(String albumId) {
+    final query = _db.localAlbumAssetEntity.select().join(
+      [
+        innerJoin(
+          _db.localAssetEntity,
+          _db.localAlbumAssetEntity.assetId.equalsExp(_db.localAssetEntity.id),
+        ),
+      ],
+    )
+      ..where(
+        _db.localAlbumAssetEntity.albumId.equals(albumId) &
+            _db.localAssetEntity.checksum.isNull(),
+      )
+      ..orderBy([OrderingTerm.asc(_db.localAssetEntity.id)]);
+
+    return query
+        .map((row) => row.readTable(_db.localAssetEntity).toDto())
+        .get();
+  }
+
+  Future<void> _upsertAssets(Iterable<LocalAsset> localAssets) {
+    if (localAssets.isEmpty) {
       return Future.value();
     }
-    return transaction(() async {
+
-      await _upsertAssets(assets);
+    return _db.batch((batch) async {
-      await _db.localAlbumAssetEntity.insertAll(
+      for (final asset in localAssets) {
-        assets.map(
+        final companion = LocalAssetEntityCompanion.insert(
-          (a) => LocalAlbumAssetEntityCompanion.insert(
+          name: asset.name,
-            assetId: a.id,
+          type: asset.type,
-            albumId: albumId,
+          createdAt: Value(asset.createdAt),
-          ),
+          updatedAt: Value(asset.updatedAt),
-        ),
+          durationInSeconds: Value.absentIfNull(asset.durationInSeconds),
-        mode: InsertMode.insertOrIgnore,
+          id: asset.id,
+          checksum: const Value(null),
         );
+        batch.insert<$LocalAssetEntityTable, LocalAssetEntityData>(
+          _db.localAssetEntity,
+          companion,
+          onConflict: DoUpdate(
+            (_) => companion,
+            where: (old) => old.updatedAt.isNotValue(asset.updatedAt),
+          ),
+        );
+      }
     });
   }
 
@@ -301,40 +345,14 @@ class DriftLocalAlbumRepository extends DriftDatabaseRepository
     return query.map((row) => row.read(assetId)!).get();
   }
 
-  Future<void> _upsertAssets(Iterable<LocalAsset> localAssets) {
-    if (localAssets.isEmpty) {
-      return Future.value();
-    }
-
-    return _db.batch((batch) async {
-      batch.insertAllOnConflictUpdate(
-        _db.localAssetEntity,
-        localAssets.map(
-          (a) => LocalAssetEntityCompanion.insert(
-            name: a.name,
-            type: a.type,
-            createdAt: Value(a.createdAt),
-            updatedAt: Value(a.updatedAt),
-            durationInSeconds: Value.absentIfNull(a.durationInSeconds),
-            id: a.id,
-            checksum: Value.absentIfNull(a.checksum),
-          ),
-        ),
-      );
-    });
-  }
-
   Future<void> _deleteAssets(Iterable<String> ids) {
     if (ids.isEmpty) {
       return Future.value();
     }
 
-    return _db.batch(
+    return _db.batch((batch) {
-      (batch) => batch.deleteWhere(
+      batch.deleteWhere(_db.localAssetEntity, (f) => f.id.isIn(ids));
-        _db.localAssetEntity,
+    });
-        (f) => f.id.isIn(ids),
-      ),
-    );
   }
 }
 

mobile/lib/infrastructure/repositories/local_asset.repository.dart

@@ -0,0 +1,28 @@
+import 'package:drift/drift.dart';
+import 'package:immich_mobile/domain/interfaces/local_asset.interface.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/infrastructure/entities/local_asset.entity.drift.dart';
+import 'package:immich_mobile/infrastructure/repositories/db.repository.dart';
+
+class DriftLocalAssetRepository extends DriftDatabaseRepository
+    implements ILocalAssetRepository {
+  final Drift _db;
+  const DriftLocalAssetRepository(this._db) : super(_db);
+
+  @override
+  Future<void> updateHashes(Iterable<LocalAsset> hashes) {
+    if (hashes.isEmpty) {
+      return Future.value();
+    }
+
+    return _db.batch((batch) async {
+      for (final asset in hashes) {
+        batch.update(
+          _db.localAssetEntity,
+          LocalAssetEntityCompanion(checksum: Value(asset.checksum)),
+          where: (e) => e.id.equals(asset.id),
+        );
+      }
+    });
+  }
+}

mobile/lib/infrastructure/repositories/storage.repository.dart

@@ -0,0 +1,31 @@
+import 'dart:io';
+
+import 'package:immich_mobile/domain/interfaces/storage.interface.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:logging/logging.dart';
+import 'package:photo_manager/photo_manager.dart';
+
+class StorageRepository implements IStorageRepository {
+  final _log = Logger('StorageRepository');
+
+  @override
+  Future<File?> getFileForAsset(LocalAsset asset) async {
+    File? file;
+    try {
+      final entity = await AssetEntity.fromId(asset.id);
+      file = await entity?.originFile;
+      if (file == null) {
+        _log.warning(
+          "Cannot get file for asset ${asset.id}, name: ${asset.name}, created on: ${asset.createdAt}",
+        );
+      }
+    } catch (error, stackTrace) {
+      _log.warning(
+        "Error getting file for asset ${asset.id}, name: ${asset.name}, created on: ${asset.createdAt}",
+        error,
+        stackTrace,
+      );
+    }
+    return file;
+  }
+}

mobile/lib/main.dart

@@ -18,8 +18,8 @@ import 'package:immich_mobile/providers/db.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/db.provider.dart';
 import 'package:immich_mobile/providers/locale_provider.dart';
 import 'package:immich_mobile/providers/theme.provider.dart';
-import 'package:immich_mobile/routing/router.dart';
 import 'package:immich_mobile/routing/app_navigation_observer.dart';
+import 'package:immich_mobile/routing/router.dart';
 import 'package:immich_mobile/services/background.service.dart';
 import 'package:immich_mobile/services/local_notification.service.dart';
 import 'package:immich_mobile/theme/dynamic_theme.dart';

mobile/lib/platform/native_sync_api.g.dart

@@ -498,4 +498,35 @@ class NativeSyncApi {
       return (pigeonVar_replyList[0] as List<Object?>?)!.cast<PlatformAsset>();
     }
   }
+
+  Future<List<Uint8List?>> hashPaths(List<String> paths) async {
+    final String pigeonVar_channelName =
+        'dev.flutter.pigeon.immich_mobile.NativeSyncApi.hashPaths$pigeonVar_messageChannelSuffix';
+    final BasicMessageChannel<Object?> pigeonVar_channel =
+        BasicMessageChannel<Object?>(
+      pigeonVar_channelName,
+      pigeonChannelCodec,
+      binaryMessenger: pigeonVar_binaryMessenger,
+    );
+    final Future<Object?> pigeonVar_sendFuture =
+        pigeonVar_channel.send(<Object?>[paths]);
+    final List<Object?>? pigeonVar_replyList =
+        await pigeonVar_sendFuture as List<Object?>?;
+    if (pigeonVar_replyList == null) {
+      throw _createConnectionError(pigeonVar_channelName);
+    } else if (pigeonVar_replyList.length > 1) {
+      throw PlatformException(
+        code: pigeonVar_replyList[0]! as String,
+        message: pigeonVar_replyList[1] as String?,
+        details: pigeonVar_replyList[2],
+      );
+    } else if (pigeonVar_replyList[0] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (pigeonVar_replyList[0] as List<Object?>?)!.cast<Uint8List?>();
+    }
+  }
 }

mobile/lib/presentation/pages/dev/dev_logger.dart

@@ -1,4 +1,5 @@
 import 'dart:async';
+import 'dart:io';
 
 import 'package:flutter/foundation.dart';
 import 'package:immich_mobile/domain/models/log.model.dart';
@@ -15,7 +16,6 @@ abstract final class DLog {
   static Stream<List<LogMessage>> watchLog() {
     final db = Isar.getInstance();
     if (db == null) {
-      debugPrint('Isar is not initialized');
       return const Stream.empty();
     }
 
@@ -30,7 +30,6 @@ abstract final class DLog {
   static void clearLog() {
     final db = Isar.getInstance();
     if (db == null) {
-      debugPrint('Isar is not initialized');
       return;
     }
 
@@ -40,7 +39,9 @@ abstract final class DLog {
   }
 
   static void log(String message, [Object? error, StackTrace? stackTrace]) {
+    if (!Platform.environment.containsKey('FLUTTER_TEST')) {
       debugPrint('[$kDevLoggerTag] [${DateTime.now()}] $message');
+    }
     if (error != null) {
       debugPrint('Error: $error');
     }
@@ -50,7 +51,6 @@ abstract final class DLog {
 
     final isar = Isar.getInstance();
     if (isar == null) {
-      debugPrint('Isar is not initialized');
       return;
     }
 

mobile/lib/presentation/pages/dev/feat_in_development.page.dart

@@ -26,6 +26,11 @@ final _features = [
     icon: Icons.photo_library_rounded,
     onTap: (_, ref) => ref.read(backgroundSyncProvider).syncLocal(full: true),
   ),
+  _Feature(
+    name: 'Hash Local Assets',
+    icon: Icons.numbers_outlined,
+    onTap: (_, ref) => ref.read(backgroundSyncProvider).hashAssets(),
+  ),
   _Feature(
     name: 'Sync Remote',
     icon: Icons.refresh_rounded,

mobile/lib/presentation/pages/dev/media_stat.page.dart

@@ -4,7 +4,6 @@ import 'package:auto_route/auto_route.dart';
 import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
-import 'package:immich_mobile/domain/models/local_album.model.dart';
 import 'package:immich_mobile/extensions/build_context_extensions.dart';
 import 'package:immich_mobile/infrastructure/repositories/db.repository.dart';
 import 'package:immich_mobile/providers/infrastructure/album.provider.dart';
@@ -94,9 +93,8 @@ class LocalMediaSummaryPage extends StatelessWidget {
               ),
               FutureBuilder(
                 future: albumsFuture,
-                initialData: <LocalAlbum>[],
                 builder: (_, snap) {
-                  final albums = snap.data!;
+                  final albums = snap.data ?? [];
                   if (albums.isEmpty) {
                     return const SliverToBoxAdapter(child: SizedBox.shrink());
                   }

mobile/lib/providers/infrastructure/asset.provider.dart

@@ -0,0 +1,8 @@
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/domain/interfaces/local_asset.interface.dart';
+import 'package:immich_mobile/infrastructure/repositories/local_asset.repository.dart';
+import 'package:immich_mobile/providers/infrastructure/db.provider.dart';
+
+final localAssetRepository = Provider<ILocalAssetRepository>(
+  (ref) => DriftLocalAssetRepository(ref.watch(driftProvider)),
+);

mobile/lib/providers/infrastructure/storage.provider.dart

@@ -0,0 +1,7 @@
+import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/domain/interfaces/storage.interface.dart';
+import 'package:immich_mobile/infrastructure/repositories/storage.repository.dart';
+
+final storageRepositoryProvider = Provider<IStorageRepository>(
+  (ref) => StorageRepository(),
+);

mobile/lib/providers/infrastructure/sync.provider.dart

@@ -1,13 +1,16 @@
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/domain/services/hash.service.dart';
 import 'package:immich_mobile/domain/services/local_sync.service.dart';
 import 'package:immich_mobile/domain/services/sync_stream.service.dart';
 import 'package:immich_mobile/infrastructure/repositories/sync_api.repository.dart';
 import 'package:immich_mobile/infrastructure/repositories/sync_stream.repository.dart';
 import 'package:immich_mobile/providers/api.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/album.provider.dart';
+import 'package:immich_mobile/providers/infrastructure/asset.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/cancel.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/db.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/platform.provider.dart';
+import 'package:immich_mobile/providers/infrastructure/storage.provider.dart';
 import 'package:immich_mobile/providers/infrastructure/store.provider.dart';
 
 final syncStreamServiceProvider = Provider(
@@ -33,3 +36,12 @@ final localSyncServiceProvider = Provider(
     storeService: ref.watch(storeServiceProvider),
   ),
 );
+
+final hashServiceProvider = Provider(
+  (ref) => HashService(
+    localAlbumRepository: ref.watch(localAlbumRepository),
+    localAssetRepository: ref.watch(localAssetRepository),
+    storageRepository: ref.watch(storageRepositoryProvider),
+    nativeSyncApi: ref.watch(nativeSyncApiProvider),
+  ),
+);

mobile/lib/utils/migration.dart

@@ -1,10 +1,13 @@
 // ignore_for_file: avoid-unsafe-collection-methods
 
 import 'dart:async';
+import 'dart:convert';
 import 'dart:io';
 
+import 'package:drift/drift.dart';
 import 'package:flutter/foundation.dart';
 import 'package:immich_mobile/domain/models/store.model.dart';
+import 'package:immich_mobile/domain/utils/background_sync.dart';
 import 'package:immich_mobile/entities/album.entity.dart';
 import 'package:immich_mobile/entities/android_device_asset.entity.dart';
 import 'package:immich_mobile/entities/asset.entity.dart';
@@ -13,14 +16,16 @@ import 'package:immich_mobile/entities/ios_device_asset.entity.dart';
 import 'package:immich_mobile/entities/store.entity.dart';
 import 'package:immich_mobile/infrastructure/entities/device_asset.entity.dart';
 import 'package:immich_mobile/infrastructure/entities/exif.entity.dart';
+import 'package:immich_mobile/infrastructure/entities/local_asset.entity.drift.dart';
 import 'package:immich_mobile/infrastructure/entities/store.entity.dart';
 import 'package:immich_mobile/infrastructure/entities/user.entity.dart';
+import 'package:immich_mobile/infrastructure/repositories/db.repository.dart';
 import 'package:immich_mobile/utils/diff.dart';
 import 'package:isar/isar.dart';
 // ignore: import_rule_photo_manager
 import 'package:photo_manager/photo_manager.dart';
 
-const int targetVersion = 11;
+const int targetVersion = 12;
 
 Future<void> migrateDatabaseIfNeeded(Isar db) async {
   final int version = Store.get(StoreKey.version, targetVersion);
@@ -45,7 +50,15 @@ Future<void> migrateDatabaseIfNeeded(Isar db) async {
     await _migrateDeviceAsset(db);
   }
 
-  final shouldTruncate = version < 8 && version < targetVersion;
+  if (version < 12 && (!kReleaseMode)) {
+    final backgroundSync = BackgroundSyncManager();
+    await backgroundSync.syncLocal();
+    final drift = Drift();
+    await _migrateDeviceAssetToSqlite(db, drift);
+    await drift.close();
+  }
+
+  final shouldTruncate = version < 8 || version < targetVersion;
   if (shouldTruncate) {
     await _migrateTo(db, targetVersion);
   }
@@ -154,6 +167,28 @@ Future<void> _migrateDeviceAsset(Isar db) async {
   });
 }
 
+Future<void> _migrateDeviceAssetToSqlite(Isar db, Drift drift) async {
+  final isarDeviceAssets =
+      await db.deviceAssetEntitys.where().sortByAssetId().findAll();
+  await drift.batch((batch) {
+    for (final deviceAsset in isarDeviceAssets) {
+      final companion = LocalAssetEntityCompanion(
+        updatedAt: Value(deviceAsset.modifiedTime),
+        id: Value(deviceAsset.assetId),
+        checksum: Value(base64.encode(deviceAsset.hash)),
+      );
+      batch.insert<$LocalAssetEntityTable, LocalAssetEntityData>(
+        drift.localAssetEntity,
+        companion,
+        onConflict: DoUpdate(
+          (_) => companion,
+          where: (old) => old.updatedAt.equals(deviceAsset.modifiedTime),
+        ),
+      );
+    }
+  });
+}
+
 class _DeviceAsset {
   final String assetId;
   final List<int>? hash;

mobile/pigeon/native_sync_api.dart

@@ -86,4 +86,7 @@ abstract class NativeSyncApi {
 
   @TaskQueue(type: TaskQueueType.serialBackgroundThread)
   List<PlatformAsset> getAssetsForAlbum(String albumId, {int? updatedTimeCond});
+
+  @TaskQueue(type: TaskQueueType.serialBackgroundThread)
+  List<Uint8List?> hashPaths(List<String> paths);
 }

mobile/test/domain/service.mock.dart

@@ -1,6 +1,7 @@
 import 'package:immich_mobile/domain/services/store.service.dart';
 import 'package:immich_mobile/domain/services/user.service.dart';
 import 'package:immich_mobile/domain/utils/background_sync.dart';
+import 'package:immich_mobile/platform/native_sync_api.g.dart';
 import 'package:mocktail/mocktail.dart';
 
 class MockStoreService extends Mock implements StoreService {}
@@ -8,3 +9,5 @@ class MockStoreService extends Mock implements StoreService {}
 class MockUserService extends Mock implements UserService {}
 
 class MockBackgroundSyncManager extends Mock implements BackgroundSyncManager {}
+
+class MockNativeSyncApi extends Mock implements NativeSyncApi {}

mobile/test/domain/services/hash_service_test.dart

@@ -1,425 +1,292 @@
 import 'dart:convert';
 import 'dart:io';
-import 'dart:math';
+import 'dart:typed_data';
 
-import 'package:collection/collection.dart';
-import 'package:file/memory.dart';
-import 'package:flutter/foundation.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:immich_mobile/domain/interfaces/device_asset.interface.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
-import 'package:immich_mobile/domain/models/device_asset.model.dart';
+import 'package:immich_mobile/domain/models/local_album.model.dart';
-import 'package:immich_mobile/entities/asset.entity.dart';
+import 'package:immich_mobile/domain/services/hash.service.dart';
-import 'package:immich_mobile/services/background.service.dart';
-import 'package:immich_mobile/services/hash.service.dart';
 import 'package:mocktail/mocktail.dart';
-import 'package:photo_manager/photo_manager.dart';
 
+import '../../fixtures/album.stub.dart';
 import '../../fixtures/asset.stub.dart';
 import '../../infrastructure/repository.mock.dart';
-import '../../service.mocks.dart';
+import '../service.mock.dart';
 
-class MockAsset extends Mock implements Asset {}
+class MockFile extends Mock implements File {}
-
-class MockAssetEntity extends Mock implements AssetEntity {}
 
 void main() {
   late HashService sut;
-  late BackgroundService mockBackgroundService;
+  late MockLocalAlbumRepository mockAlbumRepo;
-  late IDeviceAssetRepository mockDeviceAssetRepository;
+  late MockLocalAssetRepository mockAssetRepo;
+  late MockStorageRepository mockStorageRepo;
+  late MockNativeSyncApi mockNativeApi;
 
   setUp(() {
-    mockBackgroundService = MockBackgroundService();
+    mockAlbumRepo = MockLocalAlbumRepository();
-    mockDeviceAssetRepository = MockDeviceAssetRepository();
+    mockAssetRepo = MockLocalAssetRepository();
+    mockStorageRepo = MockStorageRepository();
+    mockNativeApi = MockNativeSyncApi();
 
     sut = HashService(
-      deviceAssetRepository: mockDeviceAssetRepository,
+      localAlbumRepository: mockAlbumRepo,
-      backgroundService: mockBackgroundService,
+      localAssetRepository: mockAssetRepo,
+      storageRepository: mockStorageRepo,
+      nativeSyncApi: mockNativeApi,
     );
 
-    when(() => mockDeviceAssetRepository.transaction<Null>(any()))
+    registerFallbackValue(LocalAlbumStub.recent);
-        .thenAnswer((_) async {
+    registerFallbackValue(LocalAssetStub.image1);
-      final capturedCallback = verify(
+
-        () => mockDeviceAssetRepository.transaction<Null>(captureAny()),
+    when(() => mockAssetRepo.updateHashes(any())).thenAnswer((_) async => {});
-      ).captured;
-      // Invoke the transaction callback
-      await (capturedCallback.firstOrNull as Future<Null> Function()?)?.call();
-    });
-    when(() => mockDeviceAssetRepository.updateAll(any()))
-        .thenAnswer((_) async => true);
-    when(() => mockDeviceAssetRepository.deleteIds(any()))
-        .thenAnswer((_) async => true);
   });
 
-  group("HashService: No DeviceAsset entry", () {
+  group('HashService hashAssets', () {
-    test("hash successfully", () async {
+    test('processes albums in correct order', () async {
-      final (mockAsset, file, deviceAsset, hash) =
+      final album1 = LocalAlbumStub.recent
-          await _createAssetMock(AssetStub.image1);
+          .copyWith(id: "1", backupSelection: BackupSelection.none);
-
+      final album2 = LocalAlbumStub.recent
-      when(() => mockBackgroundService.digestFiles([file.path]))
+          .copyWith(id: "2", backupSelection: BackupSelection.excluded);
-          .thenAnswer((_) async => [hash]);
+      final album3 = LocalAlbumStub.recent
-      // No DB entries for this asset
+          .copyWith(id: "3", backupSelection: BackupSelection.selected);
-      when(
+      final album4 = LocalAlbumStub.recent.copyWith(
-        () => mockDeviceAssetRepository.getByIds([AssetStub.image1.localId!]),
+        id: "4",
-      ).thenAnswer((_) async => []);
+        backupSelection: BackupSelection.selected,
-
+        isIosSharedAlbum: true,
-      final result = await sut.hashAssets([mockAsset]);
-
-      // Verify we stored the new hash in DB
-      when(() => mockDeviceAssetRepository.transaction<Null>(any()))
-          .thenAnswer((_) async {
-        final capturedCallback = verify(
-          () => mockDeviceAssetRepository.transaction<Null>(captureAny()),
-        ).captured;
-        // Invoke the transaction callback
-        await (capturedCallback.firstOrNull as Future<Null> Function()?)
-            ?.call();
-        verify(
-          () => mockDeviceAssetRepository.updateAll([
-            deviceAsset.copyWith(modifiedTime: AssetStub.image1.fileModifiedAt),
-          ]),
-        ).called(1);
-        verify(() => mockDeviceAssetRepository.deleteIds([])).called(1);
-      });
-      expect(
-        result,
-        [AssetStub.image1.copyWith(checksum: base64.encode(hash))],
       );
-    });
-  });
 
-  group("HashService: Has DeviceAsset entry", () {
+      when(() => mockAlbumRepo.getAll())
-    test("when the asset is not modified", () async {
+          .thenAnswer((_) async => [album1, album2, album4, album3]);
-      final hash = utf8.encode("image1-hash");
+      when(() => mockAlbumRepo.getAssetsToHash(any()))
+          .thenAnswer((_) async => []);
 
-      when(
+      await sut.hashAssets();
-        () => mockDeviceAssetRepository.getByIds([AssetStub.image1.localId!]),
-      ).thenAnswer(
-        (_) async => [
-          DeviceAsset(
-            assetId: AssetStub.image1.localId!,
-            hash: hash,
-            modifiedTime: AssetStub.image1.fileModifiedAt,
-          ),
-        ],
-      );
-      final result = await sut.hashAssets([AssetStub.image1]);
 
-      verifyNever(() => mockBackgroundService.digestFiles(any()));
+      verifyInOrder([
-      verifyNever(() => mockBackgroundService.digestFile(any()));
+        () => mockAlbumRepo.getAll(),
-      verifyNever(() => mockDeviceAssetRepository.updateAll(any()));
+        () => mockAlbumRepo.getAssetsToHash(album3.id),
-      verifyNever(() => mockDeviceAssetRepository.deleteIds(any()));
+        () => mockAlbumRepo.getAssetsToHash(album4.id),
-
+        () => mockAlbumRepo.getAssetsToHash(album1.id),
-      expect(result, [
+        () => mockAlbumRepo.getAssetsToHash(album2.id),
-        AssetStub.image1.copyWith(checksum: base64.encode(hash)),
       ]);
     });
 
-    test("hashed successful when asset is modified", () async {
+    test('skips albums with no assets to hash', () async {
-      final (mockAsset, file, deviceAsset, hash) =
+      when(() => mockAlbumRepo.getAll()).thenAnswer(
-          await _createAssetMock(AssetStub.image1);
+        (_) async => [LocalAlbumStub.recent.copyWith(assetCount: 0)],
-
-      when(() => mockBackgroundService.digestFiles([file.path]))
-          .thenAnswer((_) async => [hash]);
-      when(
-        () => mockDeviceAssetRepository.getByIds([AssetStub.image1.localId!]),
-      ).thenAnswer((_) async => [deviceAsset]);
-
-      final result = await sut.hashAssets([mockAsset]);
-
-      when(() => mockDeviceAssetRepository.transaction<Null>(any()))
-          .thenAnswer((_) async {
-        final capturedCallback = verify(
-          () => mockDeviceAssetRepository.transaction<Null>(captureAny()),
-        ).captured;
-        // Invoke the transaction callback
-        await (capturedCallback.firstOrNull as Future<Null> Function()?)
-            ?.call();
-        verify(
-          () => mockDeviceAssetRepository.updateAll([
-            deviceAsset.copyWith(modifiedTime: AssetStub.image1.fileModifiedAt),
-          ]),
-        ).called(1);
-        verify(() => mockDeviceAssetRepository.deleteIds([])).called(1);
-      });
-
-      verify(() => mockBackgroundService.digestFiles([file.path])).called(1);
-
-      expect(result, [
-        AssetStub.image1.copyWith(checksum: base64.encode(hash)),
-      ]);
-    });
-  });
-
-  group("HashService: Cleanup", () {
-    late Asset mockAsset;
-    late Uint8List hash;
-    late DeviceAsset deviceAsset;
-    late File file;
-
-    setUp(() async {
-      (mockAsset, file, deviceAsset, hash) =
-          await _createAssetMock(AssetStub.image1);
-
-      when(() => mockBackgroundService.digestFiles([file.path]))
-          .thenAnswer((_) async => [hash]);
-      when(
-        () => mockDeviceAssetRepository.getByIds([AssetStub.image1.localId!]),
-      ).thenAnswer((_) async => [deviceAsset]);
-    });
-
-    test("cleanups DeviceAsset when local file cannot be obtained", () async {
-      when(() => mockAsset.local).thenThrow(Exception("File not found"));
-      final result = await sut.hashAssets([mockAsset]);
-
-      verifyNever(() => mockBackgroundService.digestFiles(any()));
-      verifyNever(() => mockBackgroundService.digestFile(any()));
-      verifyNever(() => mockDeviceAssetRepository.updateAll(any()));
-      verify(
-        () => mockDeviceAssetRepository.deleteIds([AssetStub.image1.localId!]),
-      ).called(1);
-
-      expect(result, isEmpty);
-    });
-
-    test("cleanups DeviceAsset when hashing failed", () async {
-      when(() => mockDeviceAssetRepository.transaction<Null>(any()))
-          .thenAnswer((_) async {
-        final capturedCallback = verify(
-          () => mockDeviceAssetRepository.transaction<Null>(captureAny()),
-        ).captured;
-        // Invoke the transaction callback
-        await (capturedCallback.firstOrNull as Future<Null> Function()?)
-            ?.call();
-
-        // Verify the callback inside the transaction because, doing it outside results
-        // in a small delay before the callback is invoked, resulting in other LOCs getting executed
-        // resulting in an incorrect state
-        //
-        // i.e, consider the following piece of code
-        //   await _deviceAssetRepository.transaction(() async {
-        //      await _deviceAssetRepository.updateAll(toBeAdded);
-        //      await _deviceAssetRepository.deleteIds(toBeDeleted);
-        //   });
-        //   toBeDeleted.clear();
-        // since the transaction method is mocked, the callback is not invoked until it is captured
-        // and executed manually in the next event loop. However, the toBeDeleted.clear() is executed
-        // immediately once the transaction stub is executed, resulting in the deleteIds method being
-        // called with an empty list.
-        //
-        // To avoid this, we capture the callback and execute it within the transaction stub itself
-        // and verify the results inside the transaction stub
-        verify(() => mockDeviceAssetRepository.updateAll([])).called(1);
-        verify(
-          () =>
-              mockDeviceAssetRepository.deleteIds([AssetStub.image1.localId!]),
-        ).called(1);
-      });
-
-      when(() => mockBackgroundService.digestFiles([file.path])).thenAnswer(
-        // Invalid hash, length != 20
-        (_) async => [Uint8List.fromList(hash.slice(2).toList())],
       );
-
+      when(() => mockAlbumRepo.getAssetsToHash(LocalAlbumStub.recent.id))
-      final result = await sut.hashAssets([mockAsset]);
-
-      verify(() => mockBackgroundService.digestFiles([file.path])).called(1);
-      expect(result, isEmpty);
-    });
-  });
-
-  group("HashService: Batch processing", () {
-    test("processes assets in batches when size limit is reached", () async {
-      // Setup multiple assets with large file sizes
-      final (mock1, mock2, mock3) = await (
-        _createAssetMock(AssetStub.image1),
-        _createAssetMock(AssetStub.image2),
-        _createAssetMock(AssetStub.image3),
-      ).wait;
-
-      final (asset1, file1, deviceAsset1, hash1) = mock1;
-      final (asset2, file2, deviceAsset2, hash2) = mock2;
-      final (asset3, file3, deviceAsset3, hash3) = mock3;
-
-      when(() => mockDeviceAssetRepository.getByIds(any()))
           .thenAnswer((_) async => []);
 
-      // Setup for multiple batch processing calls
+      await sut.hashAssets();
-      when(() => mockBackgroundService.digestFiles([file1.path, file2.path]))
-          .thenAnswer((_) async => [hash1, hash2]);
-      when(() => mockBackgroundService.digestFiles([file3.path]))
-          .thenAnswer((_) async => [hash3]);
 
-      final size = await file1.length() + await file2.length();
+      verifyNever(() => mockStorageRepo.getFileForAsset(any()));
-
+      verifyNever(() => mockNativeApi.hashPaths(any()));
-      sut = HashService(
+    });
-        deviceAssetRepository: mockDeviceAssetRepository,
-        backgroundService: mockBackgroundService,
-        batchSizeLimit: size,
-      );
-      final result = await sut.hashAssets([asset1, asset2, asset3]);
-
-      // Verify multiple batch process calls
-      verify(() => mockBackgroundService.digestFiles([file1.path, file2.path]))
-          .called(1);
-      verify(() => mockBackgroundService.digestFiles([file3.path])).called(1);
-
-      expect(
-        result,
-        [
-          AssetStub.image1.copyWith(checksum: base64.encode(hash1)),
-          AssetStub.image2.copyWith(checksum: base64.encode(hash2)),
-          AssetStub.image3.copyWith(checksum: base64.encode(hash3)),
-        ],
-      );
   });
 
-    test("processes assets in batches when file limit is reached", () async {
+  group('HashService _hashAssets', () {
-      // Setup multiple assets with large file sizes
+    test('skips assets without files', () async {
-      final (mock1, mock2, mock3) = await (
+      final album = LocalAlbumStub.recent;
-        _createAssetMock(AssetStub.image1),
+      final asset = LocalAssetStub.image1;
-        _createAssetMock(AssetStub.image2),
+      when(() => mockAlbumRepo.getAll()).thenAnswer((_) async => [album]);
-        _createAssetMock(AssetStub.image3),
+      when(() => mockAlbumRepo.getAssetsToHash(album.id))
-      ).wait;
+          .thenAnswer((_) async => [asset]);
+      when(() => mockStorageRepo.getFileForAsset(asset))
+          .thenAnswer((_) async => null);
 
-      final (asset1, file1, deviceAsset1, hash1) = mock1;
+      await sut.hashAssets();
-      final (asset2, file2, deviceAsset2, hash2) = mock2;
-      final (asset3, file3, deviceAsset3, hash3) = mock3;
 
-      when(() => mockDeviceAssetRepository.getByIds(any()))
+      verifyNever(() => mockNativeApi.hashPaths(any()));
-          .thenAnswer((_) async => []);
+    });
 
-      when(() => mockBackgroundService.digestFiles([file1.path]))
+    test('processes assets when available', () async {
-          .thenAnswer((_) async => [hash1]);
+      final album = LocalAlbumStub.recent;
-      when(() => mockBackgroundService.digestFiles([file2.path]))
+      final asset = LocalAssetStub.image1;
-          .thenAnswer((_) async => [hash2]);
+      final mockFile = MockFile();
-      when(() => mockBackgroundService.digestFiles([file3.path]))
+      final hash = Uint8List.fromList(List.generate(20, (i) => i));
-          .thenAnswer((_) async => [hash3]);
 
-      sut = HashService(
+      when(() => mockFile.length()).thenAnswer((_) async => 1000);
-        deviceAssetRepository: mockDeviceAssetRepository,
+      when(() => mockFile.path).thenReturn('image-path');
-        backgroundService: mockBackgroundService,
+
+      when(() => mockAlbumRepo.getAll()).thenAnswer((_) async => [album]);
+      when(() => mockAlbumRepo.getAssetsToHash(album.id))
+          .thenAnswer((_) async => [asset]);
+      when(() => mockStorageRepo.getFileForAsset(asset))
+          .thenAnswer((_) async => mockFile);
+      when(() => mockNativeApi.hashPaths(['image-path'])).thenAnswer(
+        (_) async => [hash],
+      );
+
+      await sut.hashAssets();
+
+      verify(() => mockNativeApi.hashPaths(['image-path'])).called(1);
+      final captured = verify(() => mockAssetRepo.updateHashes(captureAny()))
+          .captured
+          .first as List<LocalAsset>;
+      expect(captured.length, 1);
+      expect(captured[0].checksum, base64.encode(hash));
+    });
+
+    test('handles failed hashes', () async {
+      final album = LocalAlbumStub.recent;
+      final asset = LocalAssetStub.image1;
+      final mockFile = MockFile();
+      when(() => mockFile.length()).thenAnswer((_) async => 1000);
+      when(() => mockFile.path).thenReturn('image-path');
+
+      when(() => mockAlbumRepo.getAll()).thenAnswer((_) async => [album]);
+      when(() => mockAlbumRepo.getAssetsToHash(album.id))
+          .thenAnswer((_) async => [asset]);
+      when(() => mockStorageRepo.getFileForAsset(asset))
+          .thenAnswer((_) async => mockFile);
+      when(() => mockNativeApi.hashPaths(['image-path']))
+          .thenAnswer((_) async => [null]);
+      when(() => mockAssetRepo.updateHashes(any())).thenAnswer((_) async => {});
+
+      await sut.hashAssets();
+
+      final captured = verify(() => mockAssetRepo.updateHashes(captureAny()))
+          .captured
+          .first as List<LocalAsset>;
+      expect(captured.length, 0);
+    });
+
+    test('handles invalid hash length', () async {
+      final album = LocalAlbumStub.recent;
+      final asset = LocalAssetStub.image1;
+      final mockFile = MockFile();
+      when(() => mockFile.length()).thenAnswer((_) async => 1000);
+      when(() => mockFile.path).thenReturn('image-path');
+
+      when(() => mockAlbumRepo.getAll()).thenAnswer((_) async => [album]);
+      when(() => mockAlbumRepo.getAssetsToHash(album.id))
+          .thenAnswer((_) async => [asset]);
+      when(() => mockStorageRepo.getFileForAsset(asset))
+          .thenAnswer((_) async => mockFile);
+
+      final invalidHash = Uint8List.fromList([1, 2, 3]);
+      when(() => mockNativeApi.hashPaths(['image-path']))
+          .thenAnswer((_) async => [invalidHash]);
+      when(() => mockAssetRepo.updateHashes(any())).thenAnswer((_) async => {});
+
+      await sut.hashAssets();
+
+      final captured = verify(() => mockAssetRepo.updateHashes(captureAny()))
+          .captured
+          .first as List<LocalAsset>;
+      expect(captured.length, 0);
+    });
+
+    test('batches by file count limit', () async {
+      final sut = HashService(
+        localAlbumRepository: mockAlbumRepo,
+        localAssetRepository: mockAssetRepo,
+        storageRepository: mockStorageRepo,
+        nativeSyncApi: mockNativeApi,
         batchFileLimit: 1,
       );
-      final result = await sut.hashAssets([asset1, asset2, asset3]);
 
-      // Verify multiple batch process calls
+      final album = LocalAlbumStub.recent;
-      verify(() => mockBackgroundService.digestFiles([file1.path])).called(1);
+      final asset1 = LocalAssetStub.image1;
-      verify(() => mockBackgroundService.digestFiles([file2.path])).called(1);
+      final asset2 = LocalAssetStub.image2;
-      verify(() => mockBackgroundService.digestFiles([file3.path])).called(1);
+      final mockFile1 = MockFile();
+      final mockFile2 = MockFile();
+      when(() => mockFile1.length()).thenAnswer((_) async => 100);
+      when(() => mockFile1.path).thenReturn('path-1');
+      when(() => mockFile2.length()).thenAnswer((_) async => 100);
+      when(() => mockFile2.path).thenReturn('path-2');
 
-      expect(
+      when(() => mockAlbumRepo.getAll()).thenAnswer((_) async => [album]);
-        result,
+      when(() => mockAlbumRepo.getAssetsToHash(album.id))
-        [
+          .thenAnswer((_) async => [asset1, asset2]);
-          AssetStub.image1.copyWith(checksum: base64.encode(hash1)),
+      when(() => mockStorageRepo.getFileForAsset(asset1))
-          AssetStub.image2.copyWith(checksum: base64.encode(hash2)),
+          .thenAnswer((_) async => mockFile1);
-          AssetStub.image3.copyWith(checksum: base64.encode(hash3)),
+      when(() => mockStorageRepo.getFileForAsset(asset2))
-        ],
+          .thenAnswer((_) async => mockFile2);
-      );
+
+      final hash = Uint8List.fromList(List.generate(20, (i) => i));
+      when(() => mockNativeApi.hashPaths(any()))
+          .thenAnswer((_) async => [hash]);
+      when(() => mockAssetRepo.updateHashes(any())).thenAnswer((_) async => {});
+
+      await sut.hashAssets();
+
+      verify(() => mockNativeApi.hashPaths(['path-1'])).called(1);
+      verify(() => mockNativeApi.hashPaths(['path-2'])).called(1);
+      verify(() => mockAssetRepo.updateHashes(any())).called(2);
     });
 
-    test("HashService: Sort & Process different states", () async {
+    test('batches by size limit', () async {
-      final (asset1, file1, deviceAsset1, hash1) =
+      final sut = HashService(
-          await _createAssetMock(AssetStub.image1); // Will need rehashing
+        localAlbumRepository: mockAlbumRepo,
-      final (asset2, file2, deviceAsset2, hash2) =
+        localAssetRepository: mockAssetRepo,
-          await _createAssetMock(AssetStub.image2); // Will have matching hash
+        storageRepository: mockStorageRepo,
-      final (asset3, file3, deviceAsset3, hash3) =
+        nativeSyncApi: mockNativeApi,
-          await _createAssetMock(AssetStub.image3); // No DB entry
+        batchSizeLimit: 80,
-      final asset4 =
-          AssetStub.image3.copyWith(localId: "image4"); // Cannot be hashed
-
-      when(() => mockBackgroundService.digestFiles([file1.path, file3.path]))
-          .thenAnswer((_) async => [hash1, hash3]);
-      // DB entries are not sorted and a dummy entry added
-      when(
-        () => mockDeviceAssetRepository.getByIds([
-          AssetStub.image1.localId!,
-          AssetStub.image2.localId!,
-          AssetStub.image3.localId!,
-          asset4.localId!,
-        ]),
-      ).thenAnswer(
-        (_) async => [
-          // Same timestamp to reuse deviceAsset
-          deviceAsset2.copyWith(modifiedTime: asset2.fileModifiedAt),
-          deviceAsset1,
-          deviceAsset3.copyWith(assetId: asset4.localId!),
-        ],
       );
 
-      final result = await sut.hashAssets([asset1, asset2, asset3, asset4]);
+      final album = LocalAlbumStub.recent;
+      final asset1 = LocalAssetStub.image1;
+      final asset2 = LocalAssetStub.image2;
+      final mockFile1 = MockFile();
+      final mockFile2 = MockFile();
+      when(() => mockFile1.length()).thenAnswer((_) async => 100);
+      when(() => mockFile1.path).thenReturn('path-1');
+      when(() => mockFile2.length()).thenAnswer((_) async => 100);
+      when(() => mockFile2.path).thenReturn('path-2');
 
-      // Verify correct processing of all assets
+      when(() => mockAlbumRepo.getAll()).thenAnswer((_) async => [album]);
-      verify(() => mockBackgroundService.digestFiles([file1.path, file3.path]))
+      when(() => mockAlbumRepo.getAssetsToHash(album.id))
-          .called(1);
+          .thenAnswer((_) async => [asset1, asset2]);
-      expect(result.length, 3);
+      when(() => mockStorageRepo.getFileForAsset(asset1))
-      expect(result, [
+          .thenAnswer((_) async => mockFile1);
-        AssetStub.image2.copyWith(checksum: base64.encode(hash2)),
+      when(() => mockStorageRepo.getFileForAsset(asset2))
-        AssetStub.image1.copyWith(checksum: base64.encode(hash1)),
+          .thenAnswer((_) async => mockFile2);
-        AssetStub.image3.copyWith(checksum: base64.encode(hash3)),
+
-      ]);
+      final hash = Uint8List.fromList(List.generate(20, (i) => i));
+      when(() => mockNativeApi.hashPaths(any()))
+          .thenAnswer((_) async => [hash]);
+      when(() => mockAssetRepo.updateHashes(any())).thenAnswer((_) async => {});
+
+      await sut.hashAssets();
+
+      verify(() => mockNativeApi.hashPaths(['path-1'])).called(1);
+      verify(() => mockNativeApi.hashPaths(['path-2'])).called(1);
+      verify(() => mockAssetRepo.updateHashes(any())).called(2);
     });
 
-    group("HashService: Edge cases", () {
+    test('handles mixed success and failure in batch', () async {
-      test("handles empty list of assets", () async {
+      final album = LocalAlbumStub.recent;
-        when(() => mockDeviceAssetRepository.getByIds(any()))
+      final asset1 = LocalAssetStub.image1;
-            .thenAnswer((_) async => []);
+      final asset2 = LocalAssetStub.image2;
+      final mockFile1 = MockFile();
+      final mockFile2 = MockFile();
+      when(() => mockFile1.length()).thenAnswer((_) async => 100);
+      when(() => mockFile1.path).thenReturn('path-1');
+      when(() => mockFile2.length()).thenAnswer((_) async => 100);
+      when(() => mockFile2.path).thenReturn('path-2');
 
-        final result = await sut.hashAssets([]);
+      when(() => mockAlbumRepo.getAll()).thenAnswer((_) async => [album]);
+      when(() => mockAlbumRepo.getAssetsToHash(album.id))
+          .thenAnswer((_) async => [asset1, asset2]);
+      when(() => mockStorageRepo.getFileForAsset(asset1))
+          .thenAnswer((_) async => mockFile1);
+      when(() => mockStorageRepo.getFileForAsset(asset2))
+          .thenAnswer((_) async => mockFile2);
 
-        verifyNever(() => mockBackgroundService.digestFiles(any()));
+      final validHash = Uint8List.fromList(List.generate(20, (i) => i));
-        verifyNever(() => mockDeviceAssetRepository.updateAll(any()));
+      when(() => mockNativeApi.hashPaths(['path-1', 'path-2']))
-        verifyNever(() => mockDeviceAssetRepository.deleteIds(any()));
+          .thenAnswer((_) async => [validHash, null]);
+      when(() => mockAssetRepo.updateHashes(any())).thenAnswer((_) async => {});
 
-        expect(result, isEmpty);
+      await sut.hashAssets();
-      });
 
-      test("handles all file access failures", () async {
+      final captured = verify(() => mockAssetRepo.updateHashes(captureAny()))
-        // No DB entries
+          .captured
-        when(
+          .first as List<LocalAsset>;
-          () => mockDeviceAssetRepository.getByIds(
+      expect(captured.length, 1);
-            [AssetStub.image1.localId!, AssetStub.image2.localId!],
+      expect(captured.first.id, asset1.id);
-          ),
-        ).thenAnswer((_) async => []);
-
-        final result = await sut.hashAssets([
-          AssetStub.image1,
-          AssetStub.image2,
-        ]);
-
-        verifyNever(() => mockBackgroundService.digestFiles(any()));
-        verifyNever(() => mockDeviceAssetRepository.updateAll(any()));
-        expect(result, isEmpty);
-      });
     });
   });
 }
-
-Future<(Asset, File, DeviceAsset, Uint8List)> _createAssetMock(
-  Asset asset,
-) async {
-  final random = Random();
-  final hash =
-      Uint8List.fromList(List.generate(20, (i) => random.nextInt(255)));
-  final mockAsset = MockAsset();
-  final mockAssetEntity = MockAssetEntity();
-  final fs = MemoryFileSystem();
-  final deviceAsset = DeviceAsset(
-    assetId: asset.localId!,
-    hash: Uint8List.fromList(hash),
-    modifiedTime: DateTime.now(),
-  );
-  final tmp = await fs.systemTempDirectory.createTemp();
-  final file = tmp.childFile("${asset.fileName}-path");
-  await file.writeAsString("${asset.fileName}-content");
-
-  when(() => mockAsset.localId).thenReturn(asset.localId);
-  when(() => mockAsset.fileName).thenReturn(asset.fileName);
-  when(() => mockAsset.fileCreatedAt).thenReturn(asset.fileCreatedAt);
-  when(() => mockAsset.fileModifiedAt).thenReturn(asset.fileModifiedAt);
-  when(() => mockAsset.copyWith(checksum: any(named: "checksum")))
-      .thenReturn(asset.copyWith(checksum: base64.encode(hash)));
-  when(() => mockAsset.local).thenAnswer((_) => mockAssetEntity);
-  when(() => mockAssetEntity.originFile).thenAnswer((_) async => file);
-
-  return (mockAsset, file, deviceAsset, hash);
-}

mobile/test/fixtures/album.stub.dart

@@ -1,3 +1,4 @@
+import 'package:immich_mobile/domain/models/local_album.model.dart';
 import 'package:immich_mobile/entities/album.entity.dart';
 import 'package:immich_mobile/infrastructure/entities/user.entity.dart';
 
@@ -101,3 +102,16 @@ final class AlbumStub {
     endDate: DateTime(2026),
   );
 }
+
+abstract final class LocalAlbumStub {
+  const LocalAlbumStub._();
+
+  static final recent = LocalAlbum(
+    id: "recent-local-id",
+    name: "Recent",
+    updatedAt: DateTime(2023),
+    assetCount: 1000,
+    backupSelection: BackupSelection.none,
+    isIosSharedAlbum: false,
+  );
+}

mobile/test/fixtures/asset.stub.dart

@@ -1,10 +1,11 @@
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/domain/models/exif.model.dart';
-import 'package:immich_mobile/entities/asset.entity.dart';
+import 'package:immich_mobile/entities/asset.entity.dart' as old;
 
 final class AssetStub {
   const AssetStub._();
 
-  static final image1 = Asset(
+  static final image1 = old.Asset(
     checksum: "image1-checksum",
     localId: "image1",
     remoteId: 'image1-remote',
@@ -13,7 +14,7 @@ final class AssetStub {
     fileModifiedAt: DateTime(2020),
     updatedAt: DateTime.now(),
     durationInSeconds: 0,
-    type: AssetType.image,
+    type: old.AssetType.image,
     fileName: "image1.jpg",
     isFavorite: true,
     isArchived: false,
@@ -21,7 +22,7 @@ final class AssetStub {
     exifInfo: const ExifInfo(isFlipped: false),
   );
 
-  static final image2 = Asset(
+  static final image2 = old.Asset(
     checksum: "image2-checksum",
     localId: "image2",
     remoteId: 'image2-remote',
@@ -30,7 +31,7 @@ final class AssetStub {
     fileModifiedAt: DateTime(2010),
     updatedAt: DateTime.now(),
     durationInSeconds: 60,
-    type: AssetType.video,
+    type: old.AssetType.video,
     fileName: "image2.jpg",
     isFavorite: false,
     isArchived: false,
@@ -38,7 +39,7 @@ final class AssetStub {
     exifInfo: const ExifInfo(isFlipped: true),
   );
 
-  static final image3 = Asset(
+  static final image3 = old.Asset(
     checksum: "image3-checksum",
     localId: "image3",
     ownerId: 1,
@@ -46,10 +47,30 @@ final class AssetStub {
     fileModifiedAt: DateTime(2025),
     updatedAt: DateTime.now(),
     durationInSeconds: 60,
-    type: AssetType.image,
+    type: old.AssetType.image,
     fileName: "image3.jpg",
     isFavorite: true,
     isArchived: false,
     isTrashed: false,
   );
 }
+
+abstract final class LocalAssetStub {
+  const LocalAssetStub._();
+
+  static final image1 = LocalAsset(
+    id: "image1",
+    name: "image1.jpg",
+    type: AssetType.image,
+    createdAt: DateTime(2025),
+    updatedAt: DateTime(2025, 2),
+  );
+
+  static final image2 = LocalAsset(
+    id: "image2",
+    name: "image2.jpg",
+    type: AssetType.image,
+    createdAt: DateTime(2000),
+    updatedAt: DateTime(20021),
+  );
+}

mobile/test/infrastructure/repository.mock.dart

@@ -1,5 +1,8 @@
 import 'package:immich_mobile/domain/interfaces/device_asset.interface.dart';
+import 'package:immich_mobile/domain/interfaces/local_album.interface.dart';
+import 'package:immich_mobile/domain/interfaces/local_asset.interface.dart';
 import 'package:immich_mobile/domain/interfaces/log.interface.dart';
+import 'package:immich_mobile/domain/interfaces/storage.interface.dart';
 import 'package:immich_mobile/domain/interfaces/store.interface.dart';
 import 'package:immich_mobile/domain/interfaces/sync_api.interface.dart';
 import 'package:immich_mobile/domain/interfaces/sync_stream.interface.dart';
@@ -18,6 +21,12 @@ class MockDeviceAssetRepository extends Mock
 
 class MockSyncStreamRepository extends Mock implements ISyncStreamRepository {}
 
+class MockLocalAlbumRepository extends Mock implements ILocalAlbumRepository {}
+
+class MockLocalAssetRepository extends Mock implements ILocalAssetRepository {}
+
+class MockStorageRepository extends Mock implements IStorageRepository {}
+
 // API Repos
 class MockUserApiRepository extends Mock implements IUserApiRepository {}
 

mobile/test/services/hash_service_test.dart

@@ -0,0 +1,425 @@
+import 'dart:convert';
+import 'dart:io';
+import 'dart:math';
+
+import 'package:collection/collection.dart';
+import 'package:file/memory.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/domain/interfaces/device_asset.interface.dart';
+import 'package:immich_mobile/domain/models/device_asset.model.dart';
+import 'package:immich_mobile/entities/asset.entity.dart';
+import 'package:immich_mobile/services/background.service.dart';
+import 'package:immich_mobile/services/hash.service.dart';
+import 'package:mocktail/mocktail.dart';
+import 'package:photo_manager/photo_manager.dart';
+
+import '../fixtures/asset.stub.dart';
+import '../infrastructure/repository.mock.dart';
+import '../service.mocks.dart';
+
+class MockAsset extends Mock implements Asset {}
+
+class MockAssetEntity extends Mock implements AssetEntity {}
+
+void main() {
+  late HashService sut;
+  late BackgroundService mockBackgroundService;
+  late IDeviceAssetRepository mockDeviceAssetRepository;
+
+  setUp(() {
+    mockBackgroundService = MockBackgroundService();
+    mockDeviceAssetRepository = MockDeviceAssetRepository();
+
+    sut = HashService(
+      deviceAssetRepository: mockDeviceAssetRepository,
+      backgroundService: mockBackgroundService,
+    );
+
+    when(() => mockDeviceAssetRepository.transaction<Null>(any()))
+        .thenAnswer((_) async {
+      final capturedCallback = verify(
+        () => mockDeviceAssetRepository.transaction<Null>(captureAny()),
+      ).captured;
+      // Invoke the transaction callback
+      await (capturedCallback.firstOrNull as Future<Null> Function()?)?.call();
+    });
+    when(() => mockDeviceAssetRepository.updateAll(any()))
+        .thenAnswer((_) async => true);
+    when(() => mockDeviceAssetRepository.deleteIds(any()))
+        .thenAnswer((_) async => true);
+  });
+
+  group("HashService: No DeviceAsset entry", () {
+    test("hash successfully", () async {
+      final (mockAsset, file, deviceAsset, hash) =
+          await _createAssetMock(AssetStub.image1);
+
+      when(() => mockBackgroundService.digestFiles([file.path]))
+          .thenAnswer((_) async => [hash]);
+      // No DB entries for this asset
+      when(
+        () => mockDeviceAssetRepository.getByIds([AssetStub.image1.localId!]),
+      ).thenAnswer((_) async => []);
+
+      final result = await sut.hashAssets([mockAsset]);
+
+      // Verify we stored the new hash in DB
+      when(() => mockDeviceAssetRepository.transaction<Null>(any()))
+          .thenAnswer((_) async {
+        final capturedCallback = verify(
+          () => mockDeviceAssetRepository.transaction<Null>(captureAny()),
+        ).captured;
+        // Invoke the transaction callback
+        await (capturedCallback.firstOrNull as Future<Null> Function()?)
+            ?.call();
+        verify(
+          () => mockDeviceAssetRepository.updateAll([
+            deviceAsset.copyWith(modifiedTime: AssetStub.image1.fileModifiedAt),
+          ]),
+        ).called(1);
+        verify(() => mockDeviceAssetRepository.deleteIds([])).called(1);
+      });
+      expect(
+        result,
+        [AssetStub.image1.copyWith(checksum: base64.encode(hash))],
+      );
+    });
+  });
+
+  group("HashService: Has DeviceAsset entry", () {
+    test("when the asset is not modified", () async {
+      final hash = utf8.encode("image1-hash");
+
+      when(
+        () => mockDeviceAssetRepository.getByIds([AssetStub.image1.localId!]),
+      ).thenAnswer(
+        (_) async => [
+          DeviceAsset(
+            assetId: AssetStub.image1.localId!,
+            hash: hash,
+            modifiedTime: AssetStub.image1.fileModifiedAt,
+          ),
+        ],
+      );
+      final result = await sut.hashAssets([AssetStub.image1]);
+
+      verifyNever(() => mockBackgroundService.digestFiles(any()));
+      verifyNever(() => mockBackgroundService.digestFile(any()));
+      verifyNever(() => mockDeviceAssetRepository.updateAll(any()));
+      verifyNever(() => mockDeviceAssetRepository.deleteIds(any()));
+
+      expect(result, [
+        AssetStub.image1.copyWith(checksum: base64.encode(hash)),
+      ]);
+    });
+
+    test("hashed successful when asset is modified", () async {
+      final (mockAsset, file, deviceAsset, hash) =
+          await _createAssetMock(AssetStub.image1);
+
+      when(() => mockBackgroundService.digestFiles([file.path]))
+          .thenAnswer((_) async => [hash]);
+      when(
+        () => mockDeviceAssetRepository.getByIds([AssetStub.image1.localId!]),
+      ).thenAnswer((_) async => [deviceAsset]);
+
+      final result = await sut.hashAssets([mockAsset]);
+
+      when(() => mockDeviceAssetRepository.transaction<Null>(any()))
+          .thenAnswer((_) async {
+        final capturedCallback = verify(
+          () => mockDeviceAssetRepository.transaction<Null>(captureAny()),
+        ).captured;
+        // Invoke the transaction callback
+        await (capturedCallback.firstOrNull as Future<Null> Function()?)
+            ?.call();
+        verify(
+          () => mockDeviceAssetRepository.updateAll([
+            deviceAsset.copyWith(modifiedTime: AssetStub.image1.fileModifiedAt),
+          ]),
+        ).called(1);
+        verify(() => mockDeviceAssetRepository.deleteIds([])).called(1);
+      });
+
+      verify(() => mockBackgroundService.digestFiles([file.path])).called(1);
+
+      expect(result, [
+        AssetStub.image1.copyWith(checksum: base64.encode(hash)),
+      ]);
+    });
+  });
+
+  group("HashService: Cleanup", () {
+    late Asset mockAsset;
+    late Uint8List hash;
+    late DeviceAsset deviceAsset;
+    late File file;
+
+    setUp(() async {
+      (mockAsset, file, deviceAsset, hash) =
+          await _createAssetMock(AssetStub.image1);
+
+      when(() => mockBackgroundService.digestFiles([file.path]))
+          .thenAnswer((_) async => [hash]);
+      when(
+        () => mockDeviceAssetRepository.getByIds([AssetStub.image1.localId!]),
+      ).thenAnswer((_) async => [deviceAsset]);
+    });
+
+    test("cleanups DeviceAsset when local file cannot be obtained", () async {
+      when(() => mockAsset.local).thenThrow(Exception("File not found"));
+      final result = await sut.hashAssets([mockAsset]);
+
+      verifyNever(() => mockBackgroundService.digestFiles(any()));
+      verifyNever(() => mockBackgroundService.digestFile(any()));
+      verifyNever(() => mockDeviceAssetRepository.updateAll(any()));
+      verify(
+        () => mockDeviceAssetRepository.deleteIds([AssetStub.image1.localId!]),
+      ).called(1);
+
+      expect(result, isEmpty);
+    });
+
+    test("cleanups DeviceAsset when hashing failed", () async {
+      when(() => mockDeviceAssetRepository.transaction<Null>(any()))
+          .thenAnswer((_) async {
+        final capturedCallback = verify(
+          () => mockDeviceAssetRepository.transaction<Null>(captureAny()),
+        ).captured;
+        // Invoke the transaction callback
+        await (capturedCallback.firstOrNull as Future<Null> Function()?)
+            ?.call();
+
+        // Verify the callback inside the transaction because, doing it outside results
+        // in a small delay before the callback is invoked, resulting in other LOCs getting executed
+        // resulting in an incorrect state
+        //
+        // i.e, consider the following piece of code
+        //   await _deviceAssetRepository.transaction(() async {
+        //      await _deviceAssetRepository.updateAll(toBeAdded);
+        //      await _deviceAssetRepository.deleteIds(toBeDeleted);
+        //   });
+        //   toBeDeleted.clear();
+        // since the transaction method is mocked, the callback is not invoked until it is captured
+        // and executed manually in the next event loop. However, the toBeDeleted.clear() is executed
+        // immediately once the transaction stub is executed, resulting in the deleteIds method being
+        // called with an empty list.
+        //
+        // To avoid this, we capture the callback and execute it within the transaction stub itself
+        // and verify the results inside the transaction stub
+        verify(() => mockDeviceAssetRepository.updateAll([])).called(1);
+        verify(
+          () =>
+              mockDeviceAssetRepository.deleteIds([AssetStub.image1.localId!]),
+        ).called(1);
+      });
+
+      when(() => mockBackgroundService.digestFiles([file.path])).thenAnswer(
+        // Invalid hash, length != 20
+        (_) async => [Uint8List.fromList(hash.slice(2).toList())],
+      );
+
+      final result = await sut.hashAssets([mockAsset]);
+
+      verify(() => mockBackgroundService.digestFiles([file.path])).called(1);
+      expect(result, isEmpty);
+    });
+  });
+
+  group("HashService: Batch processing", () {
+    test("processes assets in batches when size limit is reached", () async {
+      // Setup multiple assets with large file sizes
+      final (mock1, mock2, mock3) = await (
+        _createAssetMock(AssetStub.image1),
+        _createAssetMock(AssetStub.image2),
+        _createAssetMock(AssetStub.image3),
+      ).wait;
+
+      final (asset1, file1, deviceAsset1, hash1) = mock1;
+      final (asset2, file2, deviceAsset2, hash2) = mock2;
+      final (asset3, file3, deviceAsset3, hash3) = mock3;
+
+      when(() => mockDeviceAssetRepository.getByIds(any()))
+          .thenAnswer((_) async => []);
+
+      // Setup for multiple batch processing calls
+      when(() => mockBackgroundService.digestFiles([file1.path, file2.path]))
+          .thenAnswer((_) async => [hash1, hash2]);
+      when(() => mockBackgroundService.digestFiles([file3.path]))
+          .thenAnswer((_) async => [hash3]);
+
+      final size = await file1.length() + await file2.length();
+
+      sut = HashService(
+        deviceAssetRepository: mockDeviceAssetRepository,
+        backgroundService: mockBackgroundService,
+        batchSizeLimit: size,
+      );
+      final result = await sut.hashAssets([asset1, asset2, asset3]);
+
+      // Verify multiple batch process calls
+      verify(() => mockBackgroundService.digestFiles([file1.path, file2.path]))
+          .called(1);
+      verify(() => mockBackgroundService.digestFiles([file3.path])).called(1);
+
+      expect(
+        result,
+        [
+          AssetStub.image1.copyWith(checksum: base64.encode(hash1)),
+          AssetStub.image2.copyWith(checksum: base64.encode(hash2)),
+          AssetStub.image3.copyWith(checksum: base64.encode(hash3)),
+        ],
+      );
+    });
+
+    test("processes assets in batches when file limit is reached", () async {
+      // Setup multiple assets with large file sizes
+      final (mock1, mock2, mock3) = await (
+        _createAssetMock(AssetStub.image1),
+        _createAssetMock(AssetStub.image2),
+        _createAssetMock(AssetStub.image3),
+      ).wait;
+
+      final (asset1, file1, deviceAsset1, hash1) = mock1;
+      final (asset2, file2, deviceAsset2, hash2) = mock2;
+      final (asset3, file3, deviceAsset3, hash3) = mock3;
+
+      when(() => mockDeviceAssetRepository.getByIds(any()))
+          .thenAnswer((_) async => []);
+
+      when(() => mockBackgroundService.digestFiles([file1.path]))
+          .thenAnswer((_) async => [hash1]);
+      when(() => mockBackgroundService.digestFiles([file2.path]))
+          .thenAnswer((_) async => [hash2]);
+      when(() => mockBackgroundService.digestFiles([file3.path]))
+          .thenAnswer((_) async => [hash3]);
+
+      sut = HashService(
+        deviceAssetRepository: mockDeviceAssetRepository,
+        backgroundService: mockBackgroundService,
+        batchFileLimit: 1,
+      );
+      final result = await sut.hashAssets([asset1, asset2, asset3]);
+
+      // Verify multiple batch process calls
+      verify(() => mockBackgroundService.digestFiles([file1.path])).called(1);
+      verify(() => mockBackgroundService.digestFiles([file2.path])).called(1);
+      verify(() => mockBackgroundService.digestFiles([file3.path])).called(1);
+
+      expect(
+        result,
+        [
+          AssetStub.image1.copyWith(checksum: base64.encode(hash1)),
+          AssetStub.image2.copyWith(checksum: base64.encode(hash2)),
+          AssetStub.image3.copyWith(checksum: base64.encode(hash3)),
+        ],
+      );
+    });
+
+    test("HashService: Sort & Process different states", () async {
+      final (asset1, file1, deviceAsset1, hash1) =
+          await _createAssetMock(AssetStub.image1); // Will need rehashing
+      final (asset2, file2, deviceAsset2, hash2) =
+          await _createAssetMock(AssetStub.image2); // Will have matching hash
+      final (asset3, file3, deviceAsset3, hash3) =
+          await _createAssetMock(AssetStub.image3); // No DB entry
+      final asset4 =
+          AssetStub.image3.copyWith(localId: "image4"); // Cannot be hashed
+
+      when(() => mockBackgroundService.digestFiles([file1.path, file3.path]))
+          .thenAnswer((_) async => [hash1, hash3]);
+      // DB entries are not sorted and a dummy entry added
+      when(
+        () => mockDeviceAssetRepository.getByIds([
+          AssetStub.image1.localId!,
+          AssetStub.image2.localId!,
+          AssetStub.image3.localId!,
+          asset4.localId!,
+        ]),
+      ).thenAnswer(
+        (_) async => [
+          // Same timestamp to reuse deviceAsset
+          deviceAsset2.copyWith(modifiedTime: asset2.fileModifiedAt),
+          deviceAsset1,
+          deviceAsset3.copyWith(assetId: asset4.localId!),
+        ],
+      );
+
+      final result = await sut.hashAssets([asset1, asset2, asset3, asset4]);
+
+      // Verify correct processing of all assets
+      verify(() => mockBackgroundService.digestFiles([file1.path, file3.path]))
+          .called(1);
+      expect(result.length, 3);
+      expect(result, [
+        AssetStub.image2.copyWith(checksum: base64.encode(hash2)),
+        AssetStub.image1.copyWith(checksum: base64.encode(hash1)),
+        AssetStub.image3.copyWith(checksum: base64.encode(hash3)),
+      ]);
+    });
+
+    group("HashService: Edge cases", () {
+      test("handles empty list of assets", () async {
+        when(() => mockDeviceAssetRepository.getByIds(any()))
+            .thenAnswer((_) async => []);
+
+        final result = await sut.hashAssets([]);
+
+        verifyNever(() => mockBackgroundService.digestFiles(any()));
+        verifyNever(() => mockDeviceAssetRepository.updateAll(any()));
+        verifyNever(() => mockDeviceAssetRepository.deleteIds(any()));
+
+        expect(result, isEmpty);
+      });
+
+      test("handles all file access failures", () async {
+        // No DB entries
+        when(
+          () => mockDeviceAssetRepository.getByIds(
+            [AssetStub.image1.localId!, AssetStub.image2.localId!],
+          ),
+        ).thenAnswer((_) async => []);
+
+        final result = await sut.hashAssets([
+          AssetStub.image1,
+          AssetStub.image2,
+        ]);
+
+        verifyNever(() => mockBackgroundService.digestFiles(any()));
+        verifyNever(() => mockDeviceAssetRepository.updateAll(any()));
+        expect(result, isEmpty);
+      });
+    });
+  });
+}
+
+Future<(Asset, File, DeviceAsset, Uint8List)> _createAssetMock(
+  Asset asset,
+) async {
+  final random = Random();
+  final hash =
+      Uint8List.fromList(List.generate(20, (i) => random.nextInt(255)));
+  final mockAsset = MockAsset();
+  final mockAssetEntity = MockAssetEntity();
+  final fs = MemoryFileSystem();
+  final deviceAsset = DeviceAsset(
+    assetId: asset.localId!,
+    hash: Uint8List.fromList(hash),
+    modifiedTime: DateTime.now(),
+  );
+  final tmp = await fs.systemTempDirectory.createTemp();
+  final file = tmp.childFile("${asset.fileName}-path");
+  await file.writeAsString("${asset.fileName}-content");
+
+  when(() => mockAsset.localId).thenReturn(asset.localId);
+  when(() => mockAsset.fileName).thenReturn(asset.fileName);
+  when(() => mockAsset.fileCreatedAt).thenReturn(asset.fileCreatedAt);
+  when(() => mockAsset.fileModifiedAt).thenReturn(asset.fileModifiedAt);
+  when(() => mockAsset.copyWith(checksum: any(named: "checksum")))
+      .thenReturn(asset.copyWith(checksum: base64.encode(hash)));
+  when(() => mockAsset.local).thenAnswer((_) => mockAssetEntity);
+  when(() => mockAssetEntity.originFile).thenAnswer((_) async => file);
+
+  return (mockAsset, file, deviceAsset, hash);
+}