import ElementUI from 'element-ui'
import axios from 'axios'
import { Message } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'
import { Loading } from 'element-ui'
// import '@/main'
import Vue from 'vue'
const showMessage = Symbol('showMessage')
class DonMessage {
  success (options, single = true) {
    this[showMessage]('success', options, single)
  }
  warning (options, single = true) {
    this[showMessage]('warning', options, single)
  }
  info (options, single = true) {
    this[showMessage]('info', options, single)
  }
  error (options, single = true) {
    this[showMessage]('error', options, single)
  }
  [showMessage] (type, options, single) {
    if (single) {
      // 判断是否已存在Message
      if (document.getElementsByClassName('el-message').length === 0) {
        Message[type](options)
      }
    } else {
      Message[type](options)
    }
  }
}

// ... 

Vue.use(ElementUI)
// 命名根据需要，DonMessage只是在文章中使用
Vue.prototype.$message = new DonMessage()

let vue = new Vue()

let loading        //定义loading变量

function startLoading () {    //使用Element loading-start 方法
  loading = Loading.service({
    lock: true,
    fullscreen: true,
    text: '加载中……',
    background: 'rgba(0, 0, 0, 0.7)'
  })
}
function endLoading () {
  //使用Element loading-close 方法
  loading.close();
}
//那么 showFullScreenLoading() tryHideFullScreenLoading() 要干的事儿就是将同一时刻的请求合并。
//声明一个变量 needLoadingRequestCount，每次调用showFullScreenLoading方法 needLoadingRequestCount + 1。
//调用tryHideFullScreenLoading()方法，needLoadingRequestCount - 1。needLoadingRequestCount为 0 时，结束 loading。
let needLoadingRequestCount = 0
function showFullScreenLoading () {
  if (needLoadingRequestCount === 0) {
    startLoading()
  }
  needLoadingRequestCount++

}

function tryHideFullScreenLoading () {
  if (needLoadingRequestCount <= 0) return
  needLoadingRequestCount--
  if (needLoadingRequestCount === 0) {
    endLoading();

  }

}

// axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';


// create an axios instance
const service = axios.create({
  baseURL: '', // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 180000 // request timeout
})
// { fullscreen: true, text: '努力加载中', spinner: 'el-icon-loading' }
// request interceptor
service.interceptors.request.use(
  config => {
    // do something before request is sent
    showFullScreenLoading()
    if (store.getters.token) {
      // let each request carry token
      // ['X-Token'] is a custom headers key
      // please modify it according to the actual situation
      config.headers['Authorization'] = getToken()
      // config.headers['content-type'] = "application/x-www-form-urlencoded"
    }
    return config
  },
  error => {
    // do something with request error
    // console.log(error) // for debug
    tryHideFullScreenLoading()
    return Promise.reject(error)

  }
)

// response interceptor
service.interceptors.response.use(
  res => {
    //res.code !== 200
    if (res.data) {
      let data = JSON.parse(JSON.stringify(res.data))
      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (data.code == 401 || data.code == 403) {
        // Message({
        //   message: `登陆过期，请重新登录！`,
        //   type: 'error',
        //   duration: 5 * 1000
        // })
        vue.$message.error(`登陆过期，请重新登录！`)
        setTimeout(() => {
          tryHideFullScreenLoading()
          store.dispatch('user/resetToken').then(() => {
            location.reload()
          })
        }, 1000);

        return;
      }
      if (data.code != 200) {
        // Message({
        //   message: data.msg || `请求失败code码为${ data.code }`,
        //   type: 'error',
        //   duration: 5 * 1000
        // })
        let str = data.msg || `请求失败code码为${data.code}`
        // console.log(Vue);
        vue.$message.error(str)
        tryHideFullScreenLoading()
        return Promise.reject(new Error(data.msg || 'Error'))
      } else {
        tryHideFullScreenLoading()
        return data

      }
    } else {

      tryHideFullScreenLoading()
      return Promise.reject()
    }


  },
  error => {
    // console.log('err' + error) // for debug
    // Message({
    //   message: error.message,
    //   type: 'error',
    //   duration: 5 * 1000
    // })
    vue.$message.error(error.message)
    tryHideFullScreenLoading()
    return Promise.reject(error)
  }
)
export default service