lib/core/services/background_timer_service.dart - develop - siblun/ReadFlow

lib/core/services/background_timer_service.dart
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siblun
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21 апр 2026, 16:13
21 апр 2026, 16:13c40d018
import 'dart:async';
import 'dart:ui';
import 'package:flutter_background_service/flutter_background_service.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

/// Сервис для работы таймера чтения в фоновом режиме.
///
/// Использует [flutter_background_service] для поддержания активности
/// и [flutter_local_notifications] для обновления времени в шторке уведомлений.
///
/// Методы помечены @pragma('vm:entry-point') для корректной работы
/// в отдельном изоляте.
///
class BackgroundTimerService {
  static const notificationId = 888;
  static const notificationChannelId = 'read_flow_timer_channel';

  static Future<void> initialize() async {
    final service = FlutterBackgroundService();

    const AndroidNotificationChannel channel = AndroidNotificationChannel(
      notificationChannelId,
      'Активная сессия чтения',
      description: 'Показывает время текущей сессии',
      importance: Importance.low,
    );

    final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
    FlutterLocalNotificationsPlugin();

    await flutterLocalNotificationsPlugin
        .resolvePlatformSpecificImplementation<AndroidFlutterLocalNotificationsPlugin>()
        ?.createNotificationChannel(channel);

    await service.configure(
      androidConfiguration: AndroidConfiguration(
        onStart: onStart,
        autoStart: false,
        isForegroundMode: false,
        notificationChannelId: notificationChannelId,
        initialNotificationTitle: 'ReadFlow',
        initialNotificationContent: 'Сессия запущена',
        foregroundServiceNotificationId: notificationId,
      ),
      iosConfiguration: IosConfiguration(
        autoStart: false,
        onForeground: onStart,
        onBackground: onIosBackground,
      ),
    );
  }
}

@pragma('vm:entry-point')
void onStart(ServiceInstance service) async {
  DartPluginRegistrant.ensureInitialized();

  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
  FlutterLocalNotificationsPlugin();

  service.on('update').listen((event) {
    final String time = event?['time'] ?? '00:00';

    if (service is AndroidServiceInstance) {
      service.setAsForegroundService();
    }

    flutterLocalNotificationsPlugin.show(
      id: BackgroundTimerService.notificationId,
      title: 'Читаем: $time',
      body: 'Продолжайте чтение',
      notificationDetails: const NotificationDetails(
        android: AndroidNotificationDetails(
          BackgroundTimerService.notificationChannelId,
          'Активная сессия',
          icon: 'ic_bg_service_small',
          ongoing: true,
          onlyAlertOnce: true,
          importance: Importance.low,
        ),
      ),
    );
  });

  service.on('stopService').listen((event) {
    if (service is AndroidServiceInstance) {
      service.setAsBackgroundService();
    }
    service.stopSelf();
  });
}

@pragma('vm:entry-point')
bool onIosBackground(ServiceInstance service) => true;