refactor(mobile): download button in new timeline (#20010)

* download button

* minor improvements

mobile/lib/repositories/download.repository.dart

@@ -1,10 +1,28 @@
+import 'dart:convert';
+import 'dart:io';
+
 import 'package:background_downloader/background_downloader.dart';
+import 'package:collection/collection.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
+import 'package:immich_mobile/models/download/livephotos_medatada.model.dart';
+import 'package:immich_mobile/services/api.service.dart';
 import 'package:immich_mobile/utils/download.dart';
+import 'package:immich_mobile/utils/image_url_builder.dart';
 
 final downloadRepositoryProvider = Provider((ref) => DownloadRepository());
 
 class DownloadRepository {
+  static final _downloader = FileDownloader();
+  static final _dummyTask = DownloadTask(
+    taskId: 'dummy',
+    url: '',
+    filename: 'dummy',
+    group: '',
+    updates: Updates.statusAndProgress,
+  );
+  static final _dummyMetadata = {'part': LivePhotosPart.image, 'id': ''};
+
   void Function(TaskStatusUpdate)? onImageDownloadStatus;
 
   void Function(TaskStatusUpdate)? onVideoDownloadStatus;
@@ -14,19 +32,19 @@ class DownloadRepository {
   void Function(TaskProgressUpdate)? onTaskProgress;
 
   DownloadRepository() {
-    FileDownloader().registerCallbacks(
+    _downloader.registerCallbacks(
       group: downloadGroupImage,
       taskStatusCallback: (update) => onImageDownloadStatus?.call(update),
       taskProgressCallback: (update) => onTaskProgress?.call(update),
     );
 
-    FileDownloader().registerCallbacks(
+    _downloader.registerCallbacks(
       group: downloadGroupVideo,
       taskStatusCallback: (update) => onVideoDownloadStatus?.call(update),
       taskProgressCallback: (update) => onTaskProgress?.call(update),
     );
 
-    FileDownloader().registerCallbacks(
+    _downloader.registerCallbacks(
       group: downloadGroupLivePhoto,
       taskStatusCallback: (update) => onLivePhotoDownloadStatus?.call(update),
       taskProgressCallback: (update) => onTaskProgress?.call(update),
@@ -34,25 +52,87 @@ class DownloadRepository {
   }
 
   Future<List<bool>> downloadAll(List<DownloadTask> tasks) {
-    return FileDownloader().enqueueAll(tasks);
+    return _downloader.enqueueAll(tasks);
   }
 
   Future<void> deleteAllTrackingRecords() {
-    return FileDownloader().database.deleteAllRecords();
+    return _downloader.database.deleteAllRecords();
   }
 
   Future<bool> cancel(String id) {
-    return FileDownloader().cancelTaskWithId(id);
+    return _downloader.cancelTaskWithId(id);
   }
 
   Future<List<TaskRecord>> getLiveVideoTasks() {
-    return FileDownloader().database.allRecordsWithStatus(
-          TaskStatus.complete,
-          group: downloadGroupLivePhoto,
-        );
+    return _downloader.database.allRecordsWithStatus(
+      TaskStatus.complete,
+      group: downloadGroupLivePhoto,
+    );
   }
 
   Future<void> deleteRecordsWithIds(List<String> ids) {
-    return FileDownloader().database.deleteRecordsWithIds(ids);
+    return _downloader.database.deleteRecordsWithIds(ids);
+  }
+
+  Future<List<bool>> downloadAllAssets(List<RemoteAsset> assets) async {
+    if (assets.isEmpty) {
+      return Future.value(const []);
+    }
+
+    final length = Platform.isAndroid ? assets.length : assets.length * 2;
+    final tasks = List.filled(length, _dummyTask);
+    int taskIndex = 0;
+    final headers = ApiService.getRequestHeaders();
+    for (final asset in assets) {
+      if (!asset.isRemoteOnly) {
+        continue;
+      }
+
+      final id = asset.id;
+      final livePhotoVideoId = asset.livePhotoVideoId;
+      final isVideo = asset.isVideo;
+      final url = getOriginalUrlForRemoteId(id);
+
+      if (Platform.isAndroid || livePhotoVideoId == null || isVideo) {
+        tasks[taskIndex++] = DownloadTask(
+          taskId: id,
+          url: url,
+          headers: headers,
+          filename: asset.name,
+          updates: Updates.statusAndProgress,
+          group: isVideo ? downloadGroupVideo : downloadGroupImage,
+        );
+        continue;
+      }
+
+      _dummyMetadata['part'] = LivePhotosPart.image;
+      _dummyMetadata['id'] = id;
+      tasks[taskIndex++] = DownloadTask(
+        taskId: id,
+        url: url,
+        headers: headers,
+        filename: asset.name,
+        updates: Updates.statusAndProgress,
+        group: downloadGroupLivePhoto,
+        metaData: json.encode(_dummyMetadata),
+      );
+
+      _dummyMetadata['part'] = LivePhotosPart.video;
+      tasks[taskIndex++] = DownloadTask(
+        taskId: livePhotoVideoId,
+        url: url,
+        headers: headers,
+        filename: asset.name
+            .toUpperCase()
+            .replaceAll(RegExp(r"\.(JPG|HEIC)$"), '.MOV'),
+        updates: Updates.statusAndProgress,
+        group: downloadGroupLivePhoto,
+        metaData: json.encode(_dummyMetadata),
+      );
+    }
+    if (taskIndex == 0) {
+      return Future.value(const []);
+    }
+    return _downloader.enqueueAll(tasks.slice(0, taskIndex));
   }
 }