freezer/lib/api/download_manager/download_manager.dart

import 'dart:io';
import 'dart:isolate';

import 'package:flutter/src/widgets/framework.dart';
import 'package:flutter_background_service/flutter_background_service.dart';
import 'package:freezer/api/definitions.dart';
import 'package:freezer/api/download_manager/download_service.dart';
import 'package:freezer/api/download_manager/service_interface.dart';
import 'package:freezer/translations.i18n.dart';

class DownloadManager {
  //implements dl.DownloadManager {
  SendPort? _sendPort;
  Isolate? _isolate;

  Future<bool> configure() {
    if (Platform.isAndroid || Platform.isIOS) {
      return FlutterBackgroundService().configure(
          iosConfiguration: IosConfiguration(), // fuck ios
          androidConfiguration: AndroidConfiguration(
            onStart: _startNative,
            isForegroundMode: false,
            autoStart: false,
            autoStartOnBoot: false,
            foregroundServiceNotificationId: DownloadService.NOTIFICATION_ID,
            notificationChannelId: DownloadService.NOTIFICATION_CHANNEL_ID,
            initialNotificationTitle: 'Freezer'.i18n,
            initialNotificationContent: 'Starting download service...'.i18n,
          ));
    }

    // will run in foreground instead, in a separate isolate
    return Future.value(true);
  }

  Future<bool> startService() async {
    if (Platform.isAndroid) {
      return FlutterBackgroundService().startService();
    }

    final receivePort = ReceivePort();
    _sendPort = receivePort.sendPort;
    _isolate = await Isolate.spawn(
        _startService, ServiceInterface(receivePort: receivePort));

    return true;
  }

  void kill() {
    _isolate?.kill();
  }

  void invoke(String method, [Map<String, dynamic>? args]) {
    if (_sendPort != null) {
      _sendPort!.send({
        'method': method,
        if (args != null) ...args,
      });
      return;
    }
    FlutterBackgroundService().invoke(method, args);
  }

  Future<bool> addOfflineTrack(Track track,
      {bool private = true, BuildContext? context, isSingleton = false}) {
    // TODO: implement addOfflineTrack
    throw UnimplementedError();
  }

  static void _startNative(ServiceInstance service) =>
      _startService(ServiceInterface(service: service));

  static void _startService(ServiceInterface? service) =>
      DownloadService(service).run();
}