/**
 * WebSocket工具类 - 酒店客房送餐系统
 * 用于实时接收新订单通知和状态变更
 */

class HotelWebSocket {
  constructor() {
    this.ws = null
    this.reconnectTimer = null
    this.heartbeatTimer = null
    this.isConnected = false
    this.token = null
  }
  
  /**
   * 连接WebSocket
   * @param {string} token - WebSocket认证Token
   * @param {Function} onMessage - 消息回调
   * @param {Function} onError - 错误回调
   */
  connect(token, onMessage, onError) {
    if (this.isConnected) {
      console.warn('WebSocket已连接')
      return
    }
    
    this.token = token
    const wsUrl = `ws://127.0.0.1:9529/ws/hotel?token=${token}`
    
    try {
      this.ws = new WebSocket(wsUrl)
      
      this.ws.onopen = () => {
        this.isConnected = true
        console.log('✅ WebSocket连接成功')
        this.startHeartbeat()
        if (onMessage) {
          this.ws.addEventListener('message', onMessage)
        }
      }
      
      this.ws.onmessage = (event) => {
        const message = JSON.parse(event.data)
        console.log('📨 收到WebSocket消息:', message)
        
        // 根据消息类型处理
        if (message.type === 'NEW_ORDER') {
          this.handleNewOrder(message.data)
        } else if (message.type === 'ORDER_STATUS_CHANGED') {
          this.handleStatusChange(message.data)
        }
      }
      
      this.ws.onerror = (error) => {
        console.error('❌ WebSocket错误:', error)
        this.isConnected = false
        if (onError) {
          onError(error)
        }
      }
      
      this.ws.onclose = () => {
        console.log('🔌 WebSocket连接关闭')
        this.isConnected = false
        this.stopHeartbeat()
        this.attemptReconnect(onMessage, onError)
      }
    } catch (error) {
      console.error('WebSocket连接失败:', error)
      this.attemptReconnect(onMessage, onError)
    }
  }
  
  /**
   * 断开连接
   */
  disconnect() {
    if (this.ws) {
      this.ws.close()
      this.ws = null
    }
    this.isConnected = false
    this.stopHeartbeat()
    if (this.reconnectTimer) {
      clearTimeout(this.reconnectTimer)
      this.reconnectTimer = null
    }
  }
  
  /**
   * 发送消息
   */
  send(data) {
    if (this.isConnected && this.ws.readyState === WebSocket.OPEN) {
      this.ws.send(JSON.stringify(data))
    } else {
      console.warn('WebSocket未连接，无法发送消息')
    }
  }
  
  /**
   * 尝试重连
   */
  attemptReconnect(onMessage, onError) {
    if (this.reconnectTimer) {
      return
    }
    
    console.log('⏳ 3秒后尝试重连...')
    this.reconnectTimer = setTimeout(() => {
      this.reconnectTimer = null
      if (this.token) {
        this.connect(this.token, onMessage, onError)
      }
    }, 3000)
  }
  
  /**
   * 开始心跳
   */
  startHeartbeat() {
    this.heartbeatTimer = setInterval(() => {
      if (this.isConnected) {
        this.send({ type: 'PING' })
      }
    }, 30000) // 每30秒发送一次心跳
  }
  
  /**
   * 停止心跳
   */
  stopHeartbeat() {
    if (this.heartbeatTimer) {
      clearInterval(this.heartbeatTimer)
      this.heartbeatTimer = null
    }
  }
  
  /**
   * 处理新订单
   */
  handleNewOrder(order) {
    console.log('🆕 新订单:', order)
    // 触发自定义事件，供Vue组件监听
    window.dispatchEvent(new CustomEvent('hotel-new-order', { detail: order }))
  }
  
  /**
   * 处理订单状态变更
   */
  handleStatusChange(data) {
    console.log('📊 订单状态变更:', data)
    window.dispatchEvent(new CustomEvent('hotel-order-status-changed', { detail: data }))
  }
}

// 导出单例
export default new HotelWebSocket()