//引入安装的axios插件
import axios from 'axios'
import router from '@/router';
import Vue from 'vue'
const qs = require("qs");
let _this = new Vue();
let isLock = false;
let refreshSubscribers = [];
//判断token是否过期
function isTokenExpired(token) {
 let expires_time = JSON.parse(token).expires_time;
 let curentTime = new Date().getTime();
 if (curentTime >= expires_time) {
  return true;
 } else {
  return false;
 }
}
//获取Token对象
function getToken() {
 return localStorage.getItem("token");
}
//push所有请求到数组中
function subscribeTokenRefresh(cb) {
 refreshSubscribers.push(cb)
}

//刷新请求（refreshSubscribers数组中的请求得到新的token之后会自执行，用新的token去请求数据）
function onRrefreshed(token) {
 refreshSubscribers.map(cb => cb(token))
}
//刷新token
function refreshToken(config, token, resolve, reject) {
 let data = { refresh_token: JSON.parse(token).refresh_token };
 axios({
  method: "post",
  url: "xxxxxx/refreshToken",//刷新token的接口
  headers: {
   "Content-Type": "application/x-www-form-urlencoded",
   "Authorization": "Basic b3JkZXItc2VydmVyOjEyMzQ1Ng=="
  },
  data: qs.stringify(data)
 }).then(res => {
  isLock = false;//释放锁
  if (res.data.code === 101) {
   _this.$message.error('登录状态已失效，请重新登录。');
   localStorage.removeItem("token");
   router.push({
    path: "/login"
   });
   return;
  }

  let expires_time = new Date().getTime() + parseInt(res.data.data.expires_in * 0.8) * 1000;
  let token = JSON.parse(localStorage.getItem("token"));
  token.expires_time = expires_time;
  token.access_token = res.data.data.access_token;
  localStorage.setItem("token", JSON.stringify(token));

  config.headers.Authorization = 'Bearer ' + res.data.data.access_token;
  resolve(config);
  //执行数组里的函数,重新发起被挂起的请求
  onRrefreshed(res.data.data.access_token)
  //清空数组中保存的请求
  refreshSubscribers = []
 }).catch(err => {
  return err;
 });
}

function request(newOptions, resolve, reject) {
 axios({
  method: newOptions.method,
  url: newOptions.url,
  data: newOptions.type == "form" ? qs.stringify(newOptions.data) : newOptions.data,
  headers: newOptions.headers
 }).then(res => {
  if (res.status == 200) {
   //这里我们只需要获取返回的data中的数据即可
   resolve(res.data);
  } else {
   reject(res.data);
  }
 }).catch(err => {
  reject(err);
  _this.$message.error('服务异常！');
 })
}

axios.interceptors.request.use(
 config => {
  let token = getToken();
  if (token) {
   //判断token是否过期,如果过期请求刷新token
   if (isTokenExpired(token)) {
    //判断当前是否正在请求刷新token
    if (!isLock) {
     isLock = true;//isLock设置true,锁住防止死循环。
     //使用Promise等待刷新完成返回配置信息
     let refresh = new Promise((resolve, reject) => {
      refreshToken(config, token, resolve, reject);
     })
     return refresh;

    } else {
     //判断当前url是否是刷新token的请求地址，如果是直接下一步。
     if (config.url.indexOf('/logined/refreshToken') === -1) {
      //把请求(token)=>{....}都push到一个数组中
      let retry = new Promise((resolve, reject) => {
       //(token) => {...}这个函数就是回调函数
       subscribeTokenRefresh((token) => {
        config.headers.Authorization = 'Bearer ' + token
        //将请求挂起
        resolve(config)
       })
      })
      return retry

     } else {
      return config;
     }
    }

   } else {
    return config;
   }

  } else {
   return config;
  }
 }, error => {
  return Promise.reject(error);
 });
const http = options => {
 return new Promise((resolve, reject) => {
  const defaultOptions = {
   type: "json"
  };
  const newOptions = {
   ...defaultOptions,
   ...options
  };
  //headers默认传递json格式数据，这里也可以设置token，每次调用都会携带
if (localStorage.getItem("token")) {
    newOptions.headers = {
     // 'Authorization': 'Basic b3JkZXItc2VydmVyOjEyMzQ1Ng==',
     'content-Type': newOptions.type == 'form' ? 'application/x-www-form-urlencoded;charset=utf-8' : 'application/json;charset=utf-8',
     'Authorization': 'Bearer ' + JSON.parse(localStorage.getItem("token")).access_token,
     ...newOptions.headers
    };
   } else {
    newOptions.headers = {
     'content-Type': newOptions.type == 'form' ? 'application/x-www-form-urlencoded;charset=utf-8' : 'application/json;charset=utf-8',
     ...newOptions.headers
    };
   }
  request(newOptions, resolve, reject);
 })
};

//设置请求超时
axios.defaults.timeout = 30000
export default http

//在main.js下面挂载 http.js文件
import http from '@/utils/http.js';
Vue.prototype.http = http;

//登录保存token信息接口

this.http({
      method: "post",
      url: "/xxxxx/user",
      type: "form",
      headers: { Authorization:"Basicb3JkZXItc2VydmVyOjEyMzQ1Ng==" },
      data: {}
     }).then(function(res) {
        let expires_time =
         new Date().getTime() +
         parseInt(res.data.token.expires_in * 0.8) * 1000;
         let token = res.data.token;
         token.expires_time = expires_time;
        localStorage.setItem("token", JSON.stringify(token));
    
      }).catch(function(err) {
       console.log(err);
      });        

//退出清空token
this.http({
    method: "get",
    url: "/xxxxx/logout",
    data: {}
   }).then(function(res) {
 localStorage.removeItem("token");
  }).catch(function(err) {
     console.log(err);
    });