// API接口封装
const API_BASE = 'https://pactgo.cn/api/v1'

class API {
  // 用户登录
  static async login(code) {
    return this.request('/wechat/login', 'POST', { code })
  }

  // 获取用户信息
  static async getUserInfo() {
    return this.request('/wechat/userinfo', 'GET')
  }

  // 提交任务
  static async submitTask(taskData) {
    return this.request('/task/submit', 'POST', taskData)
  }

  // 获取任务列表
  static async getTaskList(page = 1, limit = 20) {
    return this.request(`/task/list?page=${page}&limit=${limit}`, 'GET')
  }

  // 获取任务详情
  static async getTaskDetail(taskId) {
    return this.request(`/task/${taskId}`, 'GET')
  }

  // 获取任务状态
  static async getTaskStatus(taskId) {
    return this.request(`/task/${taskId}/status`, 'GET')
  }

  // 发送聊天消息
  static async sendMessage(content, type = 'text') {
    return this.request('/chat/message', 'POST', { content, type })
  }

  // 获取聊天记录
  static async getChatHistory(page = 1, limit = 50) {
    return this.request(`/chat/history?page=${page}&limit=${limit}`, 'GET')
  }

  // 获取设备信息
  static async getDeviceInfo() {
    return this.request('/device/info', 'GET')
  }

  // 更新设备状态
  static async updateDeviceStatus(status) {
    return this.request('/device/status', 'POST', { status })
  }

  // 获取系统状态
  static async getSystemStatus() {
    return this.request('/system/status', 'GET')
  }

  // 通用请求方法
  static async request(url, method = 'GET', data = null) {
    return new Promise((resolve, reject) => {
      const token = wx.getStorageSync('token') || ''
      
      wx.request({
        url: API_BASE + url,
        method,
        data,
        header: {
          'Content-Type': 'application/json',
          'Authorization': token ? `Bearer ${token}` : ''
        },
        success: (res) => {
          if (res.statusCode === 200) {
            if (res.data.success !== false) {
              resolve(res.data)
            } else {
              reject(new Error(res.data.message || '请求失败'))
            }
          } else if (res.statusCode === 401) {
            // Token过期，重新登录
            wx.removeStorageSync('token')
            wx.showToast({
              title: '登录已过期，请重新登录',
              icon: 'none'
            })
            reject(new Error('登录已过期'))
          } else {
            reject(new Error(`请求失败: ${res.statusCode}`))
          }
        },
        fail: (err) => {
          console.error('API请求失败:', err)
          wx.showToast({
            title: '网络连接失败',
            icon: 'none'
          })
          reject(err)
        }
      })
    })
  }

  // 上传文件
  static async uploadFile(filePath, formData = {}) {
    return new Promise((resolve, reject) => {
      const token = wx.getStorageSync('token') || ''
      
      wx.uploadFile({
        url: API_BASE + '/upload',
        filePath: filePath,
        name: 'file',
        formData: formData,
        header: {
          'Authorization': token ? `Bearer ${token}` : ''
        },
        success: (res) => {
          if (res.statusCode === 200) {
            try {
              const data = JSON.parse(res.data)
              resolve(data)
            } catch (e) {
              reject(new Error('解析响应失败'))
            }
          } else {
            reject(new Error(`上传失败: ${res.statusCode}`))
          }
        },
        fail: (err) => {
          console.error('文件上传失败:', err)
          reject(err)
        }
      })
    })
  }
}

// WebSocket管理器
class WebSocketManager {
  constructor() {
    this.socket = null
    this.isConnected = false
    this.reconnectTimer = null
    this.messageHandlers = new Map()
  }

  connect(url) {
    if (this.socket) {
      this.disconnect()
    }

    this.socket = wx.connectSocket({
      url: url,
      header: {
        'content-type': 'application/json'
      }
    })

    this.socket.onOpen(() => {
      console.log('WebSocket连接已打开')
      this.isConnected = true
      this.clearReconnectTimer()
      
      // 发送认证信息
      this.send({
        type: 'auth',
        userId: wx.getStorageSync('userId') || 'anonymous',
        deviceId: wx.getSystemInfoSync().model,
        timestamp: Date.now()
      })
    })

    this.socket.onMessage((res) => {
      console.log('收到WebSocket消息:', res.data)
      try {
        const data = JSON.parse(res.data)
        this.handleMessage(data)
      } catch (e) {
        console.error('解析WebSocket消息失败:', e)
      }
    })

    this.socket.onClose(() => {
      console.log('WebSocket连接已关闭')
      this.isConnected = false
      this.socket = null
      this.scheduleReconnect(url)
    })

    this.socket.onError((err) => {
      console.error('WebSocket连接错误:', err)
      this.isConnected = false
      this.scheduleReconnect(url)
    })
  }

  disconnect() {
    this.clearReconnectTimer()
    if (this.socket) {
      this.socket.close()
      this.socket = null
    }
    this.isConnected = false
  }

  send(data) {
    if (this.isConnected && this.socket) {
      this.socket.send({
        data: JSON.stringify(data)
      })
    } else {
      console.warn('WebSocket未连接，无法发送消息')
    }
  }

  onMessage(type, handler) {
    if (!this.messageHandlers.has(type)) {
      this.messageHandlers.set(type, [])
    }
    this.messageHandlers.get(type).push(handler)
  }

  offMessage(type, handler) {
    if (this.messageHandlers.has(type)) {
      const handlers = this.messageHandlers.get(type)
      const index = handlers.indexOf(handler)
      if (index > -1) {
        handlers.splice(index, 1)
      }
    }
  }

  handleMessage(data) {
    if (data.type && this.messageHandlers.has(data.type)) {
      const handlers = this.messageHandlers.get(data.type)
      handlers.forEach(handler => {
        try {
          handler(data)
        } catch (e) {
          console.error('消息处理错误:', e)
        }
      })
    }
  }

  scheduleReconnect(url) {
    this.clearReconnectTimer()
    this.reconnectTimer = setTimeout(() => {
      console.log('尝试重新连接WebSocket...')
      this.connect(url)
    }, 3000)
  }

  clearReconnectTimer() {
    if (this.reconnectTimer) {
      clearTimeout(this.reconnectTimer)
      this.reconnectTimer = null
    }
  }
}

// 工具函数
const util = {
  // 格式化时间
  formatTime(date) {
    const year = date.getFullYear()
    const month = date.getMonth() + 1
    const day = date.getDate()
    const hour = date.getHours()
    const minute = date.getMinutes()
    const second = date.getSeconds()

    return [year, month, day].map(this.formatNumber).join('/') + ' ' +
           [hour, minute, second].map(this.formatNumber).join(':')
  },

  formatNumber(n) {
    n = n.toString()
    return n[1] ? n : '0' + n
  },

  // 显示加载提示
  showLoading(title = '加载中...') {
    wx.showLoading({
      title: title,
      mask: true
    })
  },

  // 隐藏加载提示
  hideLoading() {
    wx.hideLoading()
  },

  // 显示成功提示
  showSuccess(title = '操作成功') {
    wx.showToast({
      title: title,
      icon: 'success',
      duration: 2000
    })
  },

  // 显示错误提示
  showError(title = '操作失败') {
    wx.showToast({
      title: title,
      icon: 'error',
      duration: 2000
    })
  },

  // 显示模态框
  showModal(title, content) {
    return new Promise((resolve) => {
      wx.showModal({
        title: title,
        content: content,
        success: (res) => {
          resolve(res.confirm)
        }
      })
    })
  },

  // 防抖函数
  debounce(func, wait) {
    let timeout
    return function executedFunction(...args) {
      const later = () => {
        clearTimeout(timeout)
        func(...args)
      }
      clearTimeout(timeout)
      timeout = setTimeout(later, wait)
    }
  },

  // 节流函数
  throttle(func, limit) {
    let inThrottle
    return function() {
      const args = arguments
      const context = this
      if (!inThrottle) {
        func.apply(context, args)
        inThrottle = true
        setTimeout(() => inThrottle = false, limit)
      }
    }
  }
}

// 常量定义
const constants = {
  // API基础地址
  API_BASE: 'https://pactgo.cn/api/v1',
  
  // WebSocket地址
  WEBSOCKET_URL: 'wss://pactgo.cn/ws/task',
  
  // 任务状态
  TASK_STATUS: {
    PENDING: 'pending',
    PROCESSING: 'processing',
    COMPLETED: 'completed',
    FAILED: 'failed'
  },
  
  // 消息类型
  MESSAGE_TYPE: {
    TEXT: 'text',
    IMAGE: 'image',
    FILE: 'file',
    SYSTEM: 'system'
  },
  
  // 本地存储键名
  STORAGE_KEYS: {
    TOKEN: 'token',
    USER_INFO: 'userInfo',
    DEVICE_ID: 'deviceId',
    TASK_HISTORY: 'taskHistory'
  }
}

module.exports = {
  API,
  WebSocketManager,
  util,
  constants
}