import 'dart:async';
import 'dart:typed_data';

import 'package:demo001/xunfei/task_trans.dart';

abstract class ISDK {
  //创建翻译任务
  ITaskTrans createTransTask(TaskStateChangeEvent onEvent);
}

abstract class ITaskTrans {
  int state();
  String originalText();
  String translateText();
  Stream<Uint8List> originalAudio();
  Stream<Uint8List> translateAudio();
  void addAudioData(Uint8List data);
  void endpuish();
}

class Xunfei implements ISDK {
  final String appId;
  final String apiKey;
  final String apiSecret;

  //静态变量保存唯一实例
  static Xunfei? _instance;
  Xunfei._internal({
    required this.appId,
    required this.apiKey,
    required this.apiSecret,
  });

  //工厂构造函数
  factory Xunfei({
    required String appId,
    required String apiKey,
    required String apiSecret,
  }) {
    _instance ??= Xunfei._internal(
      appId: appId,
      apiKey: apiKey,
      apiSecret: apiSecret,
    );
    return _instance!;
  }

  ITaskTrans createTransTask(TaskStateChangeEvent onEvent) {
    var task = XunferTaskTrans(
        appId: this.appId,
        apiKey: this.apiKey,
        apiSecret: this.apiSecret,
        onEvent: onEvent);
    return task;
  }
}