fix: sort of completed tasks (#297)

ui/flutter/lib/api/model/task.dart

@@ -13,6 +13,7 @@ class Task {
   Status status;
   Progress progress;
   DateTime createdAt;
+  DateTime updatedAt;
 
   Task({
     required this.id,
@@ -20,6 +21,7 @@ class Task {
     required this.status,
     required this.progress,
     required this.createdAt,
+    required this.updatedAt,
   });
 
   factory Task.fromJson(Map<String, dynamic> json) => _$TaskFromJson(json);

ui/flutter/lib/api/model/task.g.dart

@@ -12,6 +12,7 @@ Task _$TaskFromJson(Map<String, dynamic> json) => Task(
       status: $enumDecode(_$StatusEnumMap, json['status']),
       progress: Progress.fromJson(json['progress'] as Map<String, dynamic>),
       createdAt: DateTime.parse(json['createdAt'] as String),
+      updatedAt: DateTime.parse(json['updatedAt'] as String),
     );
 
 Map<String, dynamic> _$TaskToJson(Task instance) => <String, dynamic>{
@@ -20,6 +21,7 @@ Map<String, dynamic> _$TaskToJson(Task instance) => <String, dynamic>{
       'status': _$StatusEnumMap[instance.status]!,
       'progress': instance.progress.toJson(),
       'createdAt': instance.createdAt.toIso8601String(),
+      'updatedAt': instance.updatedAt.toIso8601String(),
     };
 
 const _$StatusEnumMap = {

ui/flutter/lib/app/modules/task/controllers/task_downloaded_controller.dart

@@ -3,5 +3,6 @@ import 'package:gopeed/app/modules/task/controllers/task_list_controller.dart';
 import '../../../../api/model/task.dart';
 
 class TaskDownloadedController extends TaskListController {
-  TaskDownloadedController() : super([Status.done], SortDirection.asc);
+  TaskDownloadedController()
+      : super([Status.done], (a, b) => b.updatedAt.compareTo(a.updatedAt));
 }

ui/flutter/lib/app/modules/task/controllers/task_downloading_controller.dart

@@ -9,5 +9,5 @@ class TaskDownloadingController extends TaskListController {
           Status.pause,
           Status.wait,
           Status.error
-        ], SortDirection.desc);
+        ], (a, b) => b.createdAt.compareTo(a.createdAt));
 }

ui/flutter/lib/app/modules/task/controllers/task_list_controller.dart

@@ -5,13 +5,11 @@ import 'package:get/get.dart';
 import '../../../../api/api.dart';
 import '../../../../api/model/task.dart';
 
-enum SortDirection { asc, desc }
-
 abstract class TaskListController extends GetxController {
   List<Status> statuses;
-  SortDirection sortDirection;
+  int Function(Task a, Task b) compare;
 
-  TaskListController(this.statuses, this.sortDirection);
+  TaskListController(this.statuses, this.compare);
 
   final tasks = <Task>[].obs;
   final isRunning = false.obs;
@@ -48,13 +46,7 @@ abstract class TaskListController extends GetxController {
   getTasksState() async {
     final tasks = await getTasks(statuses);
     // sort tasks by create time
-    tasks.sort((a, b) {
-      if (sortDirection == SortDirection.asc) {
-        return a.createdAt.compareTo(b.createdAt);
-      } else {
-        return b.createdAt.compareTo(a.createdAt);
-      }
-    });
+    tasks.sort(compare);
     this.tasks.value = tasks;
   }
 }