refactor(mobile): album api repository for album service (#12791)

* refactor(mobile): album api repository for album service

mobile/lib/entities/album.entity.dart

@@ -3,6 +3,8 @@ import 'package:immich_mobile/entities/asset.entity.dart';
 import 'package:immich_mobile/entities/user.entity.dart';
 import 'package:immich_mobile/utils/datetime_comparison.dart';
 import 'package:isar/isar.dart';
+// ignore: implementation_imports
+import 'package:isar/src/common/isar_links_common.dart';
 import 'package:openapi/api.dart';
 
 part 'album.entity.g.dart';
@@ -23,6 +25,7 @@ class Album {
     required this.activityEnabled,
   });
 
+  // fields stored in DB
   Id id = Isar.autoIncrement;
   @Index(unique: false, replace: false, type: IndexType.hash)
   String? remoteId;
@@ -41,9 +44,17 @@ class Album {
   final IsarLinks<User> sharedUsers = IsarLinks<User>();
   final IsarLinks<Asset> assets = IsarLinks<Asset>();
 
+  // transient fields
   @ignore
   bool isAll = false;
 
+  @ignore
+  String? remoteThumbnailAssetId;
+
+  @ignore
+  int remoteAssetCount = 0;
+
+  // getters
   @ignore
   bool get isRemote => remoteId != null;
 
@@ -74,6 +85,18 @@ class Album {
   @ignore
   String get eTagKeyAssetCount => "device-album-$localId-asset-count";
 
+  // the following getter are needed because Isar links do not make data
+  // accessible in an object freshly created (not loaded from DB)
+
+  @ignore
+  Iterable<User> get remoteUsers => sharedUsers.isEmpty
+      ? (sharedUsers as IsarLinksCommon<User>).addedObjects
+      : sharedUsers;
+
+  @ignore
+  Iterable<Asset> get remoteAssets =>
+      assets.isEmpty ? (assets as IsarLinksCommon<Asset>).addedObjects : assets;
+
   @override
   bool operator ==(other) {
     if (other is! Album) return false;
@@ -129,6 +152,7 @@ class Album {
       endDate: dto.endDate,
       activityEnabled: dto.isActivityEnabled,
     );
+    a.remoteAssetCount = dto.assetCount;
     a.owner.value = await db.users.getById(dto.ownerId);
     if (dto.albumThumbnailAssetId != null) {
       a.thumbnail.value = await db.assets
@@ -164,7 +188,3 @@ extension AssetsHelper on IsarCollection<Album> {
     return a;
   }
 }
-
-extension AlbumResponseDtoHelper on AlbumResponseDto {
-  List<Asset> getAssets() => assets.map(Asset.remote).toList();
-}