import axios from 'axios'
import { Message } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'
import { Loading } from 'element-ui'
let loading        //定义loading变量

function startLoading () {    //使用Element loading-start 方法
  loading = Loading.service({
    lock: 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: 5000 // 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()
    }
    return config
  },
  error => {
    // do something with request error
    // console.log(error) // for debug
    return Promise.reject(error)
  }
)

// response interceptor
service.interceptors.response.use(
  res => {
    //res.code !== 200
    let data = JSON.parse(JSON.stringify(res.data))
    if (data.code != 200) {
      Message({
        message: data.msg || `请求失败code码为${res.code}`,
        type: 'error',
        duration: 5 * 1000
      })

      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (res.code === 401 || res.code === 403) {
        this.$message({
          message: '登录超时请重新登录',
          type: 'warning'
        })
        store.dispatch('user/resetToken').then(() => {
          location.reload()
        })
      }
      tryHideFullScreenLoading()
      return Promise.reject(new Error(res.msg || 'Error'))
    } else {
      tryHideFullScreenLoading()
      return data

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

export default service