<template>
  <div v-if="!item.hidden && item.children && adminHiddenItem(item.path)" class="menu-wrapper">
    <template v-if="hasOneShowingChild(item.children,item) && (!onlyOneChild.children||onlyOneChild.noShowingChildren)&&!item.alwaysShow">
      <app-link :to="resolvePath(onlyOneChild.path)">
        <el-menu-item :index="resolvePath(onlyOneChild.path)" :class="{'submenu-title-noDropdown':!isNest}">
          <item v-if="onlyOneChild.meta" :icon="onlyOneChild.meta.icon||item.meta.icon" :title="generateTitle(onlyOneChild.meta.title)" />
        </el-menu-item>
      </app-link>
    </template>

    <el-submenu v-else :index="resolvePath(item.path)">
      <template slot="title">
        <item v-if="item.meta" :icon="item.meta.icon" :title="generateTitle(item.meta.title)" />
      </template>

      <template v-for="child in visibleChildren">
        <sidebar-item
          v-if="child.children&&child.children.length>0"
          :key="child.path"
          :is-nest="true"
          :item="child"
          :base-path="resolvePath(child.path)"
          class="nest-menu"
        />
        <app-link v-else :key="child.name" :to="resolvePath(child.path)">
          <el-menu-item :index="resolvePath(child.path)">
            <item v-if="child.meta" :icon="child.meta.icon" :title="generateTitle(child.meta.title)" />
          </el-menu-item>
        </app-link>
      </template>
    </el-submenu>
  </div>
</template>

<script>
import path from 'path';
import { isExternal } from '@/utils/validate';
import Item from './Item';
import AppLink from './Link';
import { generateTitle } from '@/utils/i18n';

export default {
  name: 'SidebarItem',
  components: { Item, AppLink },
  props: {
    // route object
    item: {
      type: Object,
      required: true,
    },
    isNest: {
      type: Boolean,
      default: false,
    },
    basePath: {
      type: String,
      default: '',
    },
  },
  data() {
    return {
      onlyOneChild: null,
    };
  },
  computed: {
    visibleChildren() {
      return this.item.children.filter(item => !item.hidden);
    },
  },
  methods: {
    // 用户设备管理在超级管理员中不显示
    adminHiddenItem(path) {
      let show = true;
      if (localStorage.getItem('userOrAdmin') === '2') {
        if (path === '/userdevice') {
          show = false;
        }
      }
      return show;
    },
    hasOneShowingChild(children, parent) {
      const showingChildren = children.filter(item => {
        if (item.hidden) {
          return false;
        } else {
          console.log(item);
          this.onlyOneChild = item;
          return true;
        }
      });

      // When there is only one child router, the child router is displayed by default
      if (showingChildren.length === 1) {
        return true;
      }

      // Show parent if there are no child router to display
      if (showingChildren.length === 0) {
        this.onlyOneChild = { ... parent, path: '', noShowingChildren: true };
        return true;
      }

      return false;
    },
    resolvePath(routePath) {
      if (this.isExternalLink(routePath)) {
        return routePath;
      }
      return path.resolve(this.basePath, routePath);
    },
    isExternalLink(routePath) {
      return isExternal(routePath);
    },
    generateTitle,
  },
};
</script>
