/**
 * 小程序 WebSocket 通讯封装参考
 */

class ChatSocket {
  constructor(url) {
    this.url = url;
    this.socketTask = null;
    this.isOpen = false;
    this.reconnectCount = 0;
    this.maxReconnect = 5;
    this.timer = null;
    this.onMessageCallback = null;
  }

  // 初始化连接
  connect(token) {
    if (this.isOpen) return;

    this.socketTask = uni.connectSocket({
      url: `${this.url}?token=${token}`,
      success: () => {
        console.log('WebSocket 连接发起成功');
      }
    });

    this.socketTask.onOpen(() => {
      console.log('WebSocket 已连接');
      this.isOpen = true;
      this.reconnectCount = 0;
      this.startHeartbeat();
    });

    this.socketTask.onMessage((res) => {
      const data = JSON.parse(res.data);
      if (this.onMessageCallback) {
        this.onMessageCallback(data);
      }
    });

    this.socketTask.onClose(() => {
      console.log('WebSocket 已关闭');
      this.isOpen = false;
      this.reconnect();
    });

    this.socketTask.onError((err) => {
      console.error('WebSocket 错误', err);
      this.isOpen = false;
    });
  }

  // 发送消息
  send(msgObj) {
    if (!this.isOpen) {
      console.error('连接未建立，消息发送失败');
      return;
    }
    this.socketTask.send({
      data: JSON.stringify(msgObj),
      success: () => {
        console.log('消息已发出', msgObj);
      }
    });
  }

  // 心跳机制
  startHeartbeat() {
    this.timer = setInterval(() => {
      if (this.isOpen) {
        this.send({ type: 'heartbeat', msg: 'ping' });
      }
    }, 30000);
  }

  // 监听消息
  onMessage(callback) {
    this.onMessageCallback = callback;
  }

  // 断线重连
  reconnect() {
    if (this.reconnectCount < this.maxReconnect) {
      this.reconnectCount++;
      setTimeout(() => {
        console.log(`正在进行第 ${this.reconnectCount} 次重连...`);
        this.connect();
      }, 3000 * this.reconnectCount);
    }
  }

  close() {
    if (this.socketTask) {
      this.socketTask.close();
      clearInterval(this.timer);
    }
  }
}

export default new ChatSocket('wss://your-api.com/ws/chat');