import axios from 'axios'
import { MessageBox, Message, Loading } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'
import { throttle } from "@/utils"
import Vue from "vue"

let loadingInstance;
const loading = throttle(() => {
  loadingInstance = Loading.service({
    lock:true,
    spinner: "el-icon-loading",
    background:"rgba(0,0,0,0.4)",
    text:"正在加载中..."
  })
}, 200)
// create an axios instance
const service = axios.create({
  baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 20000 // request timeout
})

// request interceptor
service.interceptors.request.use(
  config => {
    // do something before request is sent
    if (config.isLoading) {
      loading()
    }
    const token = getToken();
    if (token) {
      // let each request carry token
      // ['X-Token'] is a custom headers key
      // please modify it according to the actual situation
      config.headers['Authorization'] = `Bearer ${token}`;
    }
    return config
  },
  error => {
    // do something with request error
    console.log(error) // for debug
    Vue.prototype.$nextTick().then(r => loadingInstance?.close())
    return Promise.reject(error)
  }
)

// response interceptor
service.interceptors.response.use(
  /**
   * If you want to get http information such as headers or status
   * Please return  response => response
   */

  /**
   * Determine the request status by custom code
   * Here is just an example
   * You can also judge the status by HTTP Status Code
   */
  response => {
    loadingInstance?.close()
    if (response.status !== 200) {
      return Promise.reject("系统错误")
    }
    const res = response.data

    // if the custom code is not 20000, it is judged as an error.
    if (res.code !== 0) {
      Message({
        message: res.msg || '系统错误',
        type: 'error',
        duration: 5 * 1000
      })

      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (res.code === 20001) {
        // to re-login
        MessageBox.alert('您的登录状态已过期，需重新登录',
          '登录已过期', {
            confirmButtonText: '确定',
            type: 'warning',
            closeOnClickModal: false,
            showClose: false
          }).then(() => {
          store.dispatch('user/resetToken').then(() => {
            location.reload()
          })
        })
      }
      return Promise.reject(new Error(res.msg || 'Error'))
    } else {
      return res.data
    }
  },
  error => {
    loadingInstance?.close()
    console.error('err' + error) // for debug
    Message({
      message: /Network Error/g.test(error) ? "网络错误" : "系统错误",
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)

export default service