import 'dart:async';
import 'dart:io';
import 'package:logger/logger.dart';

Logger logger = Logger();

class RoomWebSocket {
  ///单例设计模式
  RoomWebSocket._();

  static final RoomWebSocket _instance = RoomWebSocket._();

  factory RoomWebSocket() => _instance;

  /// WebSocket和心跳定时器
  String url = "";
  WebSocket? _socket;
  Timer? _heartbeatTimer;

  ///用 StreamController 分化消息给订阅者
  final StreamController<Map<String, dynamic>> _msgController = StreamController.broadcast();

  Stream<Map<String, dynamic>> get stream => _msgController.stream;

  ///开始连接
  Future<void> connect() async {
    try {
      _socket = await WebSocket.connect(url);
      //监听消息
      _socket!.listen(
        (data) {},
        onDone: () {},
        onError: (_) {
          logger.e("连接异常断开");
        },
      );
      //心跳
      _heartbeatTimer?.cancel();
      _heartbeatTimer = Timer.periodic(Duration(seconds: 15), (_) {
        logger.i("发送心跳");
      });
    } catch (e) {
      _reconnect();
    }
  }

  ///发送指令
  void send() {
    _socket!.add("");
  }

  ///连接错误事件
  void _reconnect() {
    logger.e("连接错误");
    Future.delayed(Duration(seconds: 3), connect);
  }

  void dispose() {
    _heartbeatTimer?.cancel();
    _socket?.close();
    _msgController.close();
  }
}