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

    <el-submenu v-else ref="subMenu" :index="resolvePath(item.path)" popper-append-to-body>
      <template slot="title">
        <item v-if="item.meta" :icon="item.meta && item.meta.icon" :title="item.meta.title" />
      </template>
      <sidebar-item
        v-for="child in item.children"
        :key="child.path"
        :is-nest="true"
        :item="child"
        :base-path="resolvePath(child.path)"
        class="nest-menu"
      />
    </el-submenu>
  </div>
</template>

<script>
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() {
    this.onlyOneChild = null
    return {}
  },
  methods: {
    hasOneShowingChild(children = [], parent) {
      if (!children) {
        children = [];
      }
      const showingChildren = children.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>
<style lang="scss">
  #app .sidebar-container .submenu-title-noDropdown:hover, #app .sidebar-container .el-submenu__title:hover {
    /* box-shadow: inset 2px 2px 20px #5CD9D4; */
    background: rgba(0, 0, 0, 0);
}
#app .sidebar-container .el-menu-item, #app .sidebar-container .el-submenu__title {
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    background: rgba(0, 0, 0, 0);
}
.el-menu-item:hover {
    outline: none;
    background-image: url("../../../assets/logo/item-background.png");
    background-repeat: no-repeat;
    background-size: 100% 100%;
    /* background: rgba(0, 0, 0, 0); */
    color: #31EAEA !important;
}
.el-menu-item:focus,.is-active  {
    outline: none;
    background-image: url("../../../assets/logo/item-background.png");
    background-repeat: no-repeat;
    background-size: 100% 100%;
    /* background: rgba(0, 0, 0, 0); */
    color: #31EAEA !important;
}
.el-menu--horizontal > .el-submenu .el-submenu__title:hover {
    background-color: rgba(0, 0, 0, 0);
    color: #fff;
    background-image: url("../../../assets/logo/item-background.png");
    background-repeat: no-repeat;
    background-size: 100% 100%;
}
.el-menu--horizontal > .el-submenu .el-submenu__title {
    height: 50px !important;
    line-height: 50px !important;
    margin-top: 15px;
    font-size: 22px;
    font-weight: 600;
    color: #fff;
}
.el-menu--horizontal > .el-submenu:focus .el-submenu__title, .el-menu--horizontal > .el-submenu:hover .el-submenu__title {
    color: #fff;
}
.el-menu--horizontal > .el-submenu.is-active .el-submenu__title {
    border-bottom: 0px solid;
    color: #fff;
}
.el-submenu__title i {
    color: #fff;
}
.el-menu--horizontal .el-menu .el-menu-item, .el-menu--horizontal .el-menu .el-submenu__title {
    background-color: #053B6A;
    float: none;
    height: 36px;
    line-height: 36px;
    padding: 0;
    color: #fff;
}
.el-menu--popup {
    z-index: 100;
    min-width: 120px;
    border: none;
    padding: 5px;
    border-radius: 2px;
    -webkit-box-shadow: 0 2px 12px 0 rgb(0 0 0 / 10%);
    box-shadow: 0 2px 12px 0 rgb(0 0 0 / 10%);
    background-color: #053B6A;
}
</style>