export const login = ({commit}, data) => { Service.post('/login', Qs.stringify(data))
  .then(res => {
   const success = Object.is(res.statusText, 'OK') && Object.is(res.data.code, '0')
   if (success) {
    var menus = generateMenus(res.data.menus)
    window.sessionStorage.routes = JSON.stringify(menus)
    if (menuModule.state.items.length <= 0) { // 避免注销后在不刷新页面的情况下再登录重复加载路由
     commit(types.ADD_MENU, menus)
     // 动态加载路由关键2行
     router.options.routes[0].children.push(...generateRoutesFromMenu(menuModule.state.items))
     router.addRoutes(router.options.routes)
    }
    window.sessionStorage.loginName = data.loginName
    router.push({path: '/'})
   } else {
    commit('loginErr', res.data.msg)
   }
  })
}


function generateRoutesFromMenu (menu = [], routes = []) {
 for (let i = 0, l = menu.length; i < l; i++) {
  let item = menu[i]
  if (item.path) {
   routes.push(item)
  }
  if (!item.component) {
   item.component = resolve => require([`views/` + item.component + `.vue`], resolve)
   generateRoutesFromMenu(item.children, routes)
  }
 }
 return routes
}

Vue.use(Router)
let menus = window.sessionStorage.routes //登录成功返回的菜单
if (menus) {
 let items = JSON.parse(menus)
 store.commit(ADD_MENU, items)
}

const router = new Router({
 mode: 'hash',
 linkActiveClass: 'is-active',
 scrollBehavior: () => ({ y: 0 }),
 routes: [
  {
   name: 'Main',
   path: '/',
   component: require('views/Main.vue'),
   children: [ //动态路由之所以作为Main的子路由是基于：登录之后跳转到Main主页，该主页是类似于frame的页面加载框架，只有将动态路由作为Main的子路由才能确保其他页面显示到Main框架内。
    ...generateRoutesFromMenu(menuModule.state.items)
   ]
  },
  {
   name: 'Login',
   path: '/login',
   component: require('views/Login.vue')
  }
 ]
})

function generateRoutesFromMenu (menu = [], routes = []) {
 for (let i = 0, l = menu.length; i < l; i++) {
  let item = menu[i]
  if (item.path) {
   routes.push(item)
  }
  if (!item.component) {
   item.component = resolve => require([`views/` + item.component + `.vue`], resolve)
   generateRoutesFromMenu(item.children, routes)
  }
 }
 return routes
}

const state = {
 items: [ // 什么菜单都不定义，完全由后端返回
 ]
}
const mutations = {
 [types.ADD_MENU] (state, menuItems) {
  if (menuItems.length > 0) {
   menuItems.map(function (item) {
    item.children.map(function (child) {
     child.component = lazyLoading(child.component)
    })
   })
   state.items.push(...menuItems)
  }
 },

export default (name, index = false) => () => import(`views/${name}${index ? '/index' : ''}.vue`)