import Cookies from 'js-cookie';

import router from '@/router/index'

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(0,0.7)'
})
}
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
export function showFullScreenLoading() {
if (needLoadingRequestCount === 0) {
startLoading()
}
needLoadingRequestCount++
}

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

//http request 拦截器
axios.interceptors.request.use(
config => {
var token = ''
if(typeof Cookies.get('user') === 'undefined'){
//此时为空
}else {
token = JSON.parse(Cookies.get('user')).token
}//注意使用的时候需要引入cookie方法，推荐js-cookie
config.data = JSON.stringify(config.data);
config.headers = {
'Content-Type':'application/json'
}
if(token != ''){
config.headers.token = token;
}
showFullScreenLoading()
return config;
},error => {
return Promise.reject(err);
}
);

//http response 拦截器
axios.interceptors.response.use(
response => {
//当返回信息为未登录或者登录失效的时候重定向为登录页面
if(response.data.code == 'W_100004' || response.data.message == '用户未登录或登录超时，请登录！'){
router.push({
path:"/",querry:{redirect:router.currentRoute.fullPath}//从哪个页面跳转
})
}
tryHideFullScreenLoading()
return response;
},error => {
return Promise.reject(error)
}
)