<template>
  <div v-if="!item.hidden">
    <template
      v-if="
        hasOneShowingChild(item.child, item) &&
        (!onlyOneChild.child || onlyOneChild.noShowingChildren) &&
        !item.alwaysShow
      "
    >
      <app-link v-if="onlyOneChild" :to="resolvePath(onlyOneChild.url)">
        <el-menu-item :index="resolvePath(onlyOneChild.url)" :class="{ 'submenu-title-noDropdown': !isNest }">
          <item :icon="onlyOneChild.extra || (item.meta && item.extra)" :title="onlyOneChild.name" />
        </el-menu-item>
      </app-link>
    </template>
    <el-submenu v-else ref="subMenu" :index="resolvePath(item.url)" popper-append-to-body>
      <template slot="title">
        <item v-if="item" :icon="item && item.extra" :title="item.name" />
      </template>
      <sidebar-item
        v-for="childs in item.child"
        :key="childs.url"
        :is-nest="true"
        :item="childs"
        :base-path="resolvePath(childs.url)"
        class="nest-menu"
      />
    </el-submenu>
  </div>
</template>

<script>
// +----------------------------------------------------------------------
// | CRMEB [ CRMEB赋能开发者，助力企业发展 ]
// +----------------------------------------------------------------------
// | Copyright (c) 2016~2021 https://www.crmeb.com All rights reserved.
// +----------------------------------------------------------------------
// | Licensed CRMEB并不是自由软件，未经许可不能去掉CRMEB相关版权
// +----------------------------------------------------------------------
// | Author: CRMEB Team <admin@crmeb.com>
// +----------------------------------------------------------------------

import path from 'path';
import { isExternal } from '@/utils/validate';
import Item from './Item';
import AppLink from './Link';
import FixiOSBug from './FixiOSBug';

export default {
  name: 'SidebarItem',
  components: { Item, AppLink },
  mixins: [FixiOSBug],
  props: {
    // route object
    item: {
      type: Object,
      required: true,
    },
    isNest: {
      type: Boolean,
      default: false,
    },
    basePath: {
      type: String,
      default: '',
    },
  },
  data() {
    // To fix https://github.com/PanJiaChen/vue-admin-template/issues/237
    // TODO: refactor with render function
    this.onlyOneChild = null;
    return {};
  },
  methods: {
    hasOneShowingChild(child = [], parent) {
      const showingChildren = child.filter((item) => {
        if (item.hidden) {
          return false;
        } else {
          // Temp set(will be used if only has one showing child)
          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 (isExternal(routePath)) {
        return routePath;
      }
      if (isExternal(this.basePath)) {
        return this.basePath;
      }
      return path.resolve(this.basePath, routePath);
    },
  },
};
</script>
