/*
 * @Date: 2022-05-16 17:21:45
 * @LastEditors: hookehuyr hookehuyr@gmail.com
 * @LastEditTime: 2022-06-29 17:00:15
 * @FilePath: /tswj/src/utils/generateRoute.js
 * @Description: 动态路由组装（把后端路由数据转换成 vue-router 结构）
 */

/**
 * 根据后端返回的 component 字段，生成对应页面的动态 import
 * @param {string} component views 下的页面文件名（不含 .vue）
 * @returns {() => Promise<any>} 组件加载函数
 */
function loadView(component) {
  return () => import(`../views/${component}.vue`)
}

/**
 * 生成路由结构
 * @param {Array<Object>} routes 后端路由数组
 * @returns {Array<Object>} vue-router routes 数组
 */
const generateRoutes = (routes) => {
  const arr = []
  routes.forEach(route => {
    const router = {}
    const {
      path,
      redirect,
      name,
      component,
      keepAlive,
      meta,
      children
    } = route

    router.path = path
    redirect && (router.redirect = redirect)
    name && (router.name = name)
    router.component = loadView(component)
    keepAlive && (router.keepAlive = keepAlive)
    meta && (router.meta = meta)
    // children 不是数组时，统一置空，避免生成 true 导致路由结构异常
    router.children = Array.isArray(children) ? generateRoutes(children) : [];
    arr.push(router)
  })
  return arr
}

export default generateRoutes;