/*
* 路由配置
*
* 需要鉴权的路由：meta && !meta.noAuth
* 左侧菜单显示：name && !hidden && meta.title
* 左侧菜单不折叠只有一个children的路由：alwaysShow
* 面包屑显示：meta.title
* 搜索选项显示：name && meta.title
* tab栏固定显示：meta.affix
* 页面不缓存：!name || meta.noCache
* 打开iframe：meta.iframe，不会重复打开相同src的iframe
* */
import Vue from 'vue'
import Router from 'vue-router'
import {pathToRegexp} from 'path-to-regexp'
import NProgress from 'nprogress'
import {isUserExist} from "@/utils/sessionStorage"
import {auth, needAuth} from "@/utils/auth"
import {isEmpty} from "@/utils"
import {title} from '@/config'
import constantRoutes from '@/router/constantRoutes'
import authorityRoutes from '@/router/authorityRoutes'
import store from "@/store"

Vue.use(Router)

NProgress.configure({showSpinner: false})

const endRoute = [{path: '*', redirect: '/404', hidden: true}]

const urlNoNeedLogin = [
    '/login', '/register', '/404', '/403'
].map(url => pathToRegexp(url))

metaExtend(constantRoutes)
metaExtend(authorityRoutes)

const router = new Router({
    scrollBehavior: () => ({y: 0}),
    routes: constantRoutes.concat(authorityRoutes, endRoute)
})

router.beforeEach(async (to, from, next) => {
    //使用redirect进行跳转时不显示进度条
    !to.path.startsWith('/redirect') && NProgress.start()

    document.title = getPageTitle(to.meta.title)

    //不需要登录的页面也不需要进行权限控制
    if (urlNoNeedLogin.some(reg => reg.test(to.path))) return next()

    const isLogin = isUserExist()

    //未登录时返回登录页
    if (!isLogin) return next({path: '/login', query: {redirect: to.fullPath}})

    //初始化菜单
    await initMenu()

    //已登录时访问登录页则跳转至首页
    if (to.path === '/login') return next({path: '/'})

    //页面不需要鉴权或有访问权限时通过
    if (!needAuth(to) || auth(to.path)) {
        iframeControl(to)
        return next()
    }

    //用户无权限访问时的动作
    next({path: '/403'})
})

router.afterEach(() => NProgress.done())

//初始化菜单和权限
function initMenu() {
    if (!store.state.resource.hasInitRoutes) {
        return store.dispatch('resource/init', store.state.user)
    }
    return Promise.resolve()
}

//拼接页面标题
function getPageTitle(pageTitle) {
    return pageTitle ? `${pageTitle} - ${title}` : title
}

//判断是否需要打开iframe
function iframeControl(route) {
    let operate = route.meta.iframe ? 'open' : 'close'
    store.dispatch(`iframe/${operate}`, route.meta.iframe)
}

//子路由继承父路由meta上的{affix,noAuth,noCache}，优先使用子路由的值
function metaExtend(routes, meta) {
    routes.forEach(route => {
        if (meta) {
            const keys = ['affix', 'noAuth', 'noCache']
            Object.keys(meta).forEach(key => {
                if (keys.includes(key) && !isEmpty(meta[key]) && isEmpty(route.meta[key])) {
                    route.meta[key] = meta[key]
                }
            })
        }
        if (route.children) {
            metaExtend(route.children, route.meta)
        }
    })
}

export default router