import mqtt from 'mqtt'
import { getAccessToken } from '@/utils/auth'

let mqttTool = {
  client: null
}

/** 连接Mqtt */
mqttTool.connect = function () {
  let options = {
    username: 'yanfan',
    password: getAccessToken(),
    cleanSession: true,
    keepAlive: 30,
    clientId: 'web-' + Math.random().toString(16).substr(2),
    connectTimeout: 60000
  }
  // 配置Mqtt地址
  let url = import.meta.env.VITE_MQTT_SERVER_URL
  if (url == '') {
    if (window.location.protocol === 'http:') {
      url = 'ws://' + window.location.host + '/mqtt'
    } else {
      url = 'wss://' + window.location.host + '/mqtt'
    }
  }

  mqttTool.client = mqtt.connect(url, options)
  mqttTool.client.on('connect', (e) => {
    console.log('mqtt连接成功')
  })
  // 重新连接
  mqttTool.client.on('reconnect', (error) => {
    console.log('正在重连:', error)
  })
  // 发生错误
  mqttTool.client.on('error', (error) => {
    console.log('Mqtt客户端连接失败：', error)
    mqttTool.client.end()
  })
  // 断开连接
  mqttTool.client.on('close', function (res) {
    console.log('已断开Mqtt连接')
  })
}
/** 断开连接 */
mqttTool.end = function () {
  return new Promise((resolve, reject) => {
    if (mqttTool.client == null) {
      resolve('未连接')
      console.log('未连接')
      return
    }
    mqttTool.client.end()
    mqttTool.client = null
    console.log('Mqtt服务器已断开连接！')
    resolve('连接终止')
  })
}
/** 重新连接 */
mqttTool.reconnect = function () {
  return new Promise((resolve, reject) => {
    if (mqttTool.client == null) {
      // 调用resolve方法，Promise变为操作成功状态（fulfilled）
      resolve('未连接')
      console.log('未连接')
      return
    }
    console.log('正在重连...', res)
    mqttTool.client.reconnect()
  })
}
/** 消息订阅 */
mqttTool.subscribe = function (topics) {
  return new Promise((resolve, reject) => {
    if (mqttTool.client == null) {
      resolve('未连接')
      console.log('未连接')
      return
    }
    mqttTool.client.subscribe(
      topics,
      {
        qos: 1
      },
      function (err, res) {
        console.log('订阅主题：', topics)
        if (!err) {
          console.log('订阅成功')
          resolve('订阅成功')
        } else {
          console.log('订阅失败，主题可能已经订阅')
          resolve('订阅失败')
          return
        }
      }
    )
  })
}
/** 取消订阅 */
mqttTool.unsubscribe = function (topics) {
  return new Promise((resolve, reject) => {
    if (mqttTool.client == null) {
      resolve('未连接')
      console.log('未连接')
      return
    }
    mqttTool.client.unsubscribe(topics, function (err) {
      if (!err) {
        resolve('取消订阅成功')
        console.log('取消订阅成功')
      } else {
        resolve('取消订阅失败')
        console.log('取消订阅失败')
        return
      }
    })
  })
}
mqttTool.publish = function (topic, message, name) {
  return new Promise((resolve, reject) => {
    if (mqttTool.client == null) {
      resolve('Mqtt客户端未连接')
      console.log('Mqtt客户端未连接')
      return
    }
    mqttTool.client.publish(topic, message, { qos: 1 }, function (err) {
      console.log('发送主题：', topic)
      console.log('发送内容：', message)
      if (!err) {
        if (topic.indexOf('offline') > 0) {
          console.log('[ ' + name + ' ] 影子指令发送成功')
          resolve('[ ' + name + ' ] 影子指令发送成功')
        } else {
          console.log('[ ' + name + ' ] 指令发送成功')
          resolve('[ ' + name + ' ] 指令发送成功')
        }
      } else {
        console.log('[ ' + name + ' ] 指令发送失败')
        reject('[ ' + name + ' ] 指令发送失败')
        return
      }
    })
  })
}

export default mqttTool