import React from 'react'
import { Route, Switch, withRouter } from 'react-router-dom'
import axios from 'axios'
import { Toast } from 'antd-mobile'
import ReactDOM from 'react-dom'
import Error from '../components/Error'

import Home from '../pages/Home'
import NoPage from '../pages/404'
import Login from '../pages/Login'

class Interceptors extends React.Component {
    constructor(props) {
        super(props)
        this.errorDom = null
        this.cancel = null
    }


    componentDidMount() {
        // 监听路由变化
        this.props.history.listen(route => {
            if (this.cancel) {
                this.cancel("取消请求")
                Toast.hide()
            }
        })
    }


    renderError() {
        if (this.errorDom) {
            return
        }
        this.errorDom = document.createElement('div')
        ReactDOM.render(
            <Error reload={() => {
                this.errorDom.remove()
                window.location.reload()
            }}
            goBack={() => {
                this.errorDom.remove()
                this.props.history.goBack()
            }}
            />, this.errorDom)
        document.body.appendChild(this.errorDom)
    }

    componentWillMount() {
        let cancelToken = axios.CancelToken
        /**
        * 添加请求拦截器
        */
        axios.interceptors.request.use(config => {
            this.errorDom && this.errorDom.remove()
            config.headers['token'] = getToken()
            config.cancelToken = new cancelToken(c => {
                this.cancel = c
            })
            return config
        }, error => {
            return Promise.reject(error)
        })

        /**
        * 添加响应拦截器
        */
        axios.interceptors.response.use(response => {
            const { data, msg, success } = response.data
            if (success === -1) {
                this.props.history.push('/login')
                return ''
            }
            if (success === false) {
                Toast.info(msg, 2)
                return Promise.reject(msg)
            }
            return data || response.data
        }, error => {
            if (axios.isCancel(error)) {
                return Promise.reject(error)
            }
            Toast.fail('服务器出错', 2)
            this.renderError()
            return Promise.reject(error)
        })
    }

    render() {
        return (
            <div>
                <Switch>
                    <Route path='/home' component={Home} />
                    <Route path='/404' component={NoPage} />
                    <Route path='/login' component={Login} />
                </Switch>
            </div>
        )
    }
}

export default withRouter(Interceptors)