import axios from 'axios'
import { Notify } from 'vant'
import { Loading } from 'element-ui'
import $store from '@/store'
import store from '@/store/modules/login'
import router from '@/router'
import NProgress from 'nprogress'
import 'nprogress/nprogress.css'
import { saveAs } from 'file-saver'
axios.defaults.timeout = 100000

let pending = [] //声明一个数组用于存储每个ajax请求的取消函数和ajax标识
let cancelToken = axios.CancelToken
let removePending = (ever) => {
  for (let p in pending) {
    if (
      pending[p].u === ever.url + '&' + ever.method &&
      pending[p].data === eval.data
    ) {
      //当当前请求在数组中存在时执行函数体
      pending[p].f() //执行取消操作
      pending.splice(p, 1) //把这条记录从数组中移除
    }
  }
}

// 请求拦截（配置发送请求的信息）
axios.interceptors.request.use(
  (config) => {
    // 处理请求之前的配置
    // let loadingInstance = Loading.service({ fullscreen: true }); //开始
    NProgress.start() //开始
    store.state.loadding = true //在请求发出之前进行一些操作
    config.headers = config.headers || {}
    if (config.headers && config.headers.constructor == String) {
      try {
        config.headers = JSON.parse(config.headers)
      } catch (e) {
        Message.error(`请求头部不是有效的JSON格式:${config.headers}`)
        throw e
      }
    }
    config.headers['Accept-Language'] = localStorage.getItem('lang') || 'zh-CN'
    if (store.state.loginAccount) {
      config.headers['Tenant-Code'] =
        localStorage
          .getItem(store.state.loginAccount + 'loginRoutePath')
          .replace('/login/', '') || ''
    }
    const currentUser = store.state.currentUser
    currentUser &&
      currentUser.token &&
      !config.headers.Authorization &&
      (config.headers.Authorization = `Bearer ${currentUser.token}`)
    //如果是请求auth接口，则不带token
    if (config.url.indexOf('/auth?') != -1) {
      delete config.headers.Authorization
    }
    if (config.url.indexOf('/sso/') != -1) {
      delete config.headers.Authorization
    }
    removePending(config) //在一个ajax发送前执行一下取消操作
    config.cancelToken = new cancelToken((c) => {
      // 将请求的地址和请求的方式构建为一个字符串存放到请求数组中
      pending.push({
        u: config.url + '&' + config.method,
        f: c,
        data: config.data,
      })
    })
    // 判断是否需要刷新token
    let currentTime = new Date().getTime()
    if (
      currentUser &&
      currentUser.loginTime &&
      currentTime - currentUser.loginTime >=
        (currentUser.expiration / 5) * 1000 &&
      config.url.indexOf('/refresh') == -1
    ) {
      $store.dispatch('login/refreshAndGetAuthenticationToken')
    }
    return config
  },
  (error) => {
    // 请求失败的处理
    NProgress.done() // 结束
    // loadingInstance.close(); // 结束
    return Promise.reject(error)
  }
)

// 响应拦截（配置请求回来的信息）
axios.interceptors.response.use(
  (res) => {
    // 处理响应数据
    // let loadingInstance = Loading.service({ fullscreen: true }); //开始
    let isShowMessage =
      res.config.isShowMessage !== undefined ? res.config.isShowMessage : true
    removePending(res.config) //在一个ajax响应后再执行一下取消操作，把已经完成的请求从pending中移除
    if (
      res.data &&
      res.data.state != undefined &&
      res.data.state === false &&
      isShowMessage
    ) {
      Notify({ type: 'danger', message: res.data.message })
    }
    store.state.loadding = false //在这里对返回的数据进行处理
    // loadingInstance.close(); // 结束
    NProgress.done() // 结束
    // 附件下载
    if (
      res &&
      res.status == 200 &&
      res.headers &&
      res.headers['content-disposition'] &&
      res.headers['content-disposition'].startsWith('attachment;')
    ) {
      let blob = new Blob([res.data])
      const fileName = decodeURIComponent(
        res.headers['content-disposition'].split(';')[1].split('filename=')[1]
      )
      saveAs(blob, fileName)
    }
    return res
  },
  (error) => {
    // 处理响应失败
    let loadingInstance = Loading.service({ fullscreen: true }) //开始
    const errorMessage =
      error &&
      error.response &&
      error.response.data &&
      error.response.data.message
        ? error.response.data.message
        : error.message
    if (error && error.response && error.response.status === 401) {
      $store.dispatch('login/clearCurrentUser')
      router.push({ path: '/login' })
    } else if (error && error.response && error.response.status === 403) {
      Notify({ type: 'danger', message: errorMessage })
    } else if (error && error.response && error.response.status === 500) {
      if (error.response.data && error.response.data.message) {
        //如果是jwt超时了
        if (error.response.data.message.indexOf('JWT expired at') >= 0) {
          Notify({ type: 'warning', message: '登录认证超时，请重新登录！' })
        } else {
          Notify({ type: 'danger', message: error.response.data.message })
        }
      } else {
        Notify({ type: 'danger', message: error.message })
      }
    } else if (errorMessage && typeof errorMessage != 'undefined') {
      //如果是jwt超时了
      if (errorMessage.indexOf('JWT expired at') >= 0) {
        Notify({ type: 'warning', message: '登录认证超时，请重新登录！' })
      } else {
        Notify({ type: 'danger', message: errorMessage })
      }
    }
    NProgress.done() // 结束
    loadingInstance.close() // 结束
    return Promise.reject(error)
  }
)

export default {
  request(data) {
    let reqData = data.data || {}
    //支持表达式作为域名解析
    data.url = this.parseUrl(data.url)
    //统一拼接域名接口
    if (data.url.indexOf('http') == -1) {
      data.url = context.mobile + data.url
    }
    let requestData = {
      url: data.url,
      data: reqData,
      method: data.method || 'GET',
      params: data.params || {},
      onUploadProgress: data.onUploadProgress || null,
      headers: data.headers || '',
      responseType: data.responseType || 'json',
      isShowMessage: data.isShowMessage,
    }
    return axios(requestData)
  },
  download(url) {
    return this.request({ url, responseType: 'arraybuffer' })
  },
  get(url, type, isShowMessage) {
    return this.request({
      url,
      responseType: type,
      isShowMessage: isShowMessage,
    })
  },
  post(url, data, responseType) {
    return this.request({
      url,
      data,
      method: 'POST',
      responseType: responseType,
    })
  },
  remove(url) {
    return this.request({ url, method: 'DELETE' })
  },
  getContext() {
    return context
  },
  parseUrl(url) {
    if (url === '') return
    var ctx = this.getContext(),
      reg = /^(\$\{(\w+)\})\/.*$/

    var match = reg.exec(url)
    if (match != null) {
      var name = match[2],
        mc = match[1],
        val = ctx[name]
      if (!val) {
        throw new Error(
          "The '" +
            name +
            "' in url:" +
            url +
            ' does not defined in context provider.'
        )
      }
      return url.replace(mc, val)
    } else {
      return url
    }
  },
}