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 = ['/login']; // no redirect whitelist

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()
    } else {
      // determine whether the user has obtained his permission perms through getInfo
      const hasPerms = store.getters.perms && store.getters.perms.length > 0;
      if (hasPerms) {
        next()
      } else {
        try {
          // get user info
          // note: perms must be a object array! such as: ['admin'] or ,['developer','editor']
          const { perms } = await store.dispatch('user/getInfo');
          // generate accessible routes map based on perms
          const accessRoutes = await store.dispatch('permission/generateRoutes', perms);

          // 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(`/login?redirect=${to.path}`);
          NProgress.done()
        }
      }
    }
  } else {
    /* has no token*/
    if (to.path === '/index'){
      next()
    }else if (whiteList.indexOf(to.path) !== -1) {
      // in the free login whitelist, go directly
      next()
    } else {
      // other pages that do not have permission to access are redirected to the login page.
      next(`/login?redirect=${to.path}`);
      NProgress.done()
    }
  }
});

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