feat(desktop): implement native desktop notifications for task completion and errors (#1293)

ui/flutter/lib/app/services/notification_service.dart

@@ -0,0 +1,146 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/services.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:get/get.dart';
+import 'package:path_provider/path_provider.dart';
+
+import '../../api/api.dart';
+import '../../api/model/task.dart';
+import '../../util/util.dart';
+import '../modules/app/controllers/app_controller.dart';
+
+class NotificationService extends GetxService {
+  Timer? _timer;
+  final Map<String, Status> _previousStatus = {};
+
+  final AppController appController = Get.find<AppController>();
+  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
+      FlutterLocalNotificationsPlugin();
+
+  @override
+  void onInit() {
+    super.onInit();
+    _initNotifications();
+    _startPolling();
+  }
+
+  Future<void> _initNotifications() async {
+    const DarwinInitializationSettings initializationSettingsDarwin =
+        DarwinInitializationSettings(
+            requestAlertPermission: false,
+            requestBadgePermission: false,
+            requestSoundPermission: false);
+
+    final LinuxInitializationSettings initializationSettingsLinux =
+        LinuxInitializationSettings(
+      defaultActionName: 'Open notification',
+      defaultIcon: AssetsLinuxIcon('assets/icon/icon.png'),
+    );
+
+    String? windowsIconPath;
+    try {
+      if (Util.isWindows()) {
+        final byteData = await rootBundle.load('assets/icon/icon.ico');
+        final tempDir = await getTemporaryDirectory();
+        final file = File('${tempDir.path}/notification_icon.ico');
+        await file.writeAsBytes(byteData.buffer
+            .asUint8List(byteData.offsetInBytes, byteData.lengthInBytes));
+        windowsIconPath = file.path;
+      }
+    } catch (e) {
+      // Ignore
+    }
+
+    final WindowsInitializationSettings initializationSettingsWindows =
+        WindowsInitializationSettings(
+      appName: 'Gopeed',
+      appUserModelId: 'com.gopeed.gopeed',
+      guid: '3c1bf3f4-3d91-4eaa-a33f-8705e71cf1ce', // unique guid
+      iconPath: windowsIconPath,
+    );
+
+    final InitializationSettings initializationSettings =
+        InitializationSettings(
+      macOS: initializationSettingsDarwin,
+      linux: initializationSettingsLinux,
+      windows: initializationSettingsWindows,
+    );
+
+    await flutterLocalNotificationsPlugin.initialize(
+      settings: initializationSettings,
+    );
+  }
+
+  @override
+  void onClose() {
+    _timer?.cancel();
+    super.onClose();
+  }
+
+  void _startPolling() {
+    _timer = Timer.periodic(const Duration(seconds: 2), (timer) async {
+      try {
+        final config = appController.downloaderConfig.value;
+        if (!config.extra.desktopNotification) {
+          return;
+        }
+
+        final tasks = await getTasks([
+          Status.ready,
+          Status.running,
+          Status.pause,
+          Status.wait,
+          Status.error,
+          Status.done,
+        ]);
+
+        for (var task in tasks) {
+          final prevStatus = _previousStatus[task.id];
+          final currentStatus = task.status;
+
+          if (prevStatus != null && prevStatus != currentStatus) {
+            if (currentStatus == Status.done) {
+              _showNotification(
+                title: 'notificationTaskDone'.tr,
+                body: task.name,
+              );
+            } else if (currentStatus == Status.error) {
+              _showNotification(
+                title: 'notificationTaskError'.tr,
+                body: task.name,
+              );
+            }
+          }
+          _previousStatus[task.id] = currentStatus;
+        }
+
+        // Clean up deleted tasks from map
+        final currentTaskIds = tasks.map((t) => t.id).toSet();
+        _previousStatus
+            .removeWhere((id, status) => !currentTaskIds.contains(id));
+      } catch (e) {
+        // Ignored
+      }
+    });
+  }
+
+  int _notificationId = 0;
+
+  Future<void> _showNotification(
+      {required String title, required String body}) async {
+    const NotificationDetails notificationDetails = NotificationDetails(
+      macOS: DarwinNotificationDetails(),
+      linux: LinuxNotificationDetails(),
+      windows: WindowsNotificationDetails(),
+    );
+
+    await flutterLocalNotificationsPlugin.show(
+      id: _notificationId++,
+      title: title,
+      body: body,
+      notificationDetails: notificationDetails,
+    );
+  }
+}