import router from './router'
import store from './store'
import { Message } from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import { getToken } from '@/utils/auth' // get token from cookie
import getPageTitle from '@/utils/get-page-title'

NProgress.configure({ showSpinner: false }) // NProgress Configuration

const whiteList = ['/menu','/login', '/auth-redirect'] // no redirect whitelist
export function flatRoutes(routes) {
  let ret = [];
  routes.forEach(it => {
    const r = {...it, children: []};
    it.children.forEach(it2 => {
      // 把三级移动到二级,以避免keep-alive无法缓存多级路由的状态
      if (it2.children && it2.children.length > 0) {
        it2.children.forEach(it3 => r.children.push({...it3, children: null}));
        return;
      }
      // 直接添加二级路由
      r.children.push({...it2, children: null});
    });
    ret.push(r);
  });
  return ret;
}
router.beforeEach(async(to, from, next) => {
  // start progress bar
  NProgress.start()

  // set page title
  document.title = getPageTitle(to.meta.title)

  // determine whether the user has logged in
  const hasToken = getToken()

  if (hasToken) {
    if (to.path === '/login') {
      // if is logged in, redirect to the home page
      next({ path: '/' })
      NProgress.done() // hack: https://github.com/PanJiaChen/vue-element-admin/pull/2939
    } else {
      // determine whether the user has obtained his permission roles through getInfo

      const hasRoles = store.getters.roles && store.getters.roles.length > 0
      if (hasRoles) {
        next()
      } else {
        // next()
        try {
          // get user info
          // note: roles must be a object array! such as: ['admin'] or ,['developer','editor']
          // const { roles } = await store.dispatch('user/getInfo')
          const {menu} = await store.dispatch('user/getInfo')
          if (menu.length === 0) {
            throw new Error('没有任何菜单信息！getInfo')
          }
          // generate accessible routes map based on roles
          // console.log(roles)
          // const accessRoutes = await store.dispatch('permission/generateRoutes', roles)
          let accessRoutes = await store.dispatch('permission/generateRoutes', menu)

          accessRoutes = flatRoutes(accessRoutes);
          // dynamically add accessible routes
          router.addRoutes(accessRoutes)

          // hack method to ensure that addRoutes is complete
          // set the replace: true, so the navigation will not leave a history record
          next({ ...to, replace: true })
        } catch (error) {
          // remove token and go to login page to re-login
          await store.dispatch('user/resetToken')
          Message.error(error || 'Has Error')
          next(`/menu?redirect=${to.path}`)
          NProgress.done()
        }
      }
    }
  } else {
    /* has no token*/

    if (whiteList.indexOf(to.path) !== -1) {
      // in the free login whitelist, go directly
      next()
    } else {
      // other pages that do not have permission to access are redirected to the login page.
      next(`/menu?redirect=${to.path}`)
      NProgress.done()
    }
  }
})

router.afterEach(() => {
  // finish progress bar
  NProgress.done()
})