// utils/websocket.js
class LocalWebSocket {
  constructor() {
    this.socket = null;
    this.isConnected = false;
    this.reconnectTimer = null;
    this.reconnectCount = 0;
    this.maxReconnectAttempts = 5;
    this.reconnectDelay = 3000;
    
    // 默认配置
    this.defaultConfig = {
      ip: '192.168.1.100',
      port: 8080,
      path: '/websocket'
    };
    
    this.storageKey = 'WEBSOCKET_SERVER_CONFIG';
  }

  // 从本地存储获取配置
  getConfig() {
    try {
      const configStr = uni.getStorageSync(this.storageKey);
      if (configStr) {
        return JSON.parse(configStr);
      }
      return this.defaultConfig;
    } catch (error) {
      console.error('获取WebSocket配置失败:', error);
      return this.defaultConfig;
    }
  }

  // 保存配置到本地存储
  saveConfig(config) {
    try {
      uni.setStorageSync(this.storageKey, JSON.stringify(config));
      return true;
    } catch (error) {
      console.error('保存WebSocket配置失败:', error);
      return false;
    }
  }

  // 获取WebSocket连接URL
  getWebSocketURL() {
    const config = this.getConfig();
    return `ws://${config.ip}:${config.port}${config.path}`;
  }

  // 连接WebSocket
  connect() {
    if (this.socket && this.isConnected) {
      console.log('WebSocket已连接');
      return;
    }

    const url = this.getWebSocketURL();
    console.log('尝试连接WebSocket:', url);

    // 创建WebSocket连接
    this.socket = new WebSocket(url);

    // 监听连接成功
    this.socket.onopen = (event) => {
      console.log('WebSocket连接成功');
      this.isConnected = true;
      this.reconnectCount = 0;
      this.onOpen && this.onOpen(event);
    };

    // 监听消息接收
    this.socket.onmessage = (event) => {
      console.log('收到WebSocket消息:', event.data);
      this.onMessage && this.onMessage(event);
    };

    // 监听连接关闭
    this.socket.onclose = (event) => {
      console.log('WebSocket连接关闭:', event);
      this.isConnected = false;
      this.onClose && this.onClose(event);
      this.handleReconnect();
    };

    // 监听错误
    this.socket.onerror = (error) => {
      console.error('WebSocket连接错误:', error);
      this.onError && this.onError(error);
    };
  }

  // 处理重连
  handleReconnect() {
    if (this.reconnectCount < this.maxReconnectAttempts) {
      this.reconnectCount++;
      console.log(`WebSocket尝试重连 (${this.reconnectCount}/${this.maxReconnectAttempts})`);
      
      this.reconnectTimer = setTimeout(() => {
        this.connect();
      }, this.reconnectDelay * this.reconnectCount);
    } else {
      console.log('WebSocket重连次数已达上限');
    }
  }

  // 发送消息
  send(data) {
    if (this.isConnected && this.socket) {
      if (typeof data === 'object') {
        data = JSON.stringify(data);
      }
      this.socket.send(data);
      return true;
    } else {
      console.warn('WebSocket未连接，无法发送消息');
      return false;
    }
  }

  // 关闭连接
  close() {
    if (this.socket) {
      this.socket.close();
      this.socket = null;
    }
    if (this.reconnectTimer) {
      clearTimeout(this.reconnectTimer);
      this.reconnectTimer = null;
    }
    this.isConnected = false;
  }

  // 更新服务端配置
  updateServerConfig(newConfig) {
    const config = { ...this.defaultConfig, ...newConfig };
    this.saveConfig(config);
    
    // 如果当前已连接，重新连接
    if (this.isConnected) {
      this.close();
      this.connect();
    }
  }

  // 设置回调函数
  setOnOpen(callback) {
    this.onOpen = callback;
  }

  setOnMessage(callback) {
    this.onMessage = callback;
  }

  setOnClose(callback) {
    this.onClose = callback;
  }

  setOnError(callback) {
    this.onError = callback;
  }
}

export default new LocalWebSocket();