<template>
  <div v-if="!item.hidden" class="menu-wrapper">
    <template v-if="hasOneShowingChild(item.children || [], item)">
      <el-menu-item
        :index="index"
        :class="{ 'submenu-title-noDropdown': !isNest ,}"
        @click.native="toPage(item)"
      >
        <img v-if="showIcon(item)" class="menu-m-icon" :src="item.iconPath">

        <svg-icon
          v-else-if="showSvg(item)"
          class="user-m-icon"
          :icon-class="item.iconPath"
        />
        <div class="silder-menu-item-text">
          {{ item.name || "" }}
        </div>
        <i v-if="item.children&&item.children.length>0" class="el-icon-arrow-down arrow" />
      </el-menu-item>
    </template>

    <el-submenu v-else ref="subMenu" :index="index" popper-append-to-body>
      <template slot="title">
        <img v-if="showIcon(item)" class="menu-m-icon" :src="item.iconPath">
        <svg-icon
          v-else-if="showSvg(item)"
          class="user-m-icon"
          :icon-class="item.iconPath"
        />
        <div class="silder-menu-item-text">
          {{ item.name || "" }}
        </div>
        <!-- </div> -->
      </template>
      <sidebar-item
        v-for="(child, childIndex) in item.children"
        :key="child.path"
        :is-nest="true"
        :item="child"
        :index="index + '-' + childIndex"
        class="nest-menu"
      />
    </el-submenu>
  </div>
</template>

<script>
import FixiOSBug from './FixiOSBug'

export default {
  name: 'SidebarItem',
  mixins: [FixiOSBug],
  props: {
    item: {
      type: Object,
      required: true
    },
    index: {
      type: [String, Number],
      default: ''
    },
    isNest: {
      type: Boolean,
      default: false
    }
  },
  data() {
    // To fix https://github.com/PanJiaChen/vue-admin-template/issues/237
    // TODO: refactor with render function
    this.onlyOneChild = null
    return {}
  },
  methods: {
    toPage(data, basePath) {
      let list = []
      Object.keys(this.$store.state.tagsView.visitedViews).forEach(key => {
        list = [...list, ...this.$store.state.tagsView.visitedViews[key]]
      })
      if (list.length >= 15) {
        this.$message.warning('超过最大标签数,添加新的标签页需要关闭已经打开标签页!')
        return
      }
      if (data.menuSource === '1') {
        const page = {
          path: `/iframePage/${encodeURIComponent(data.menuUrl)}`,
          query: {}
        }
        if (data.name) {
          page.query = { title: data.name }
        }
        if (data.menuRootAppId) {
          page.query.menuRootAppId = data.menuRootAppId
        }
        this.$router.push(page)
      } else {
        const item = data.dxApplicationPage
        if (!item) {
          this.$message.warning('当前菜单下未挂载页面,请联系管理员进行分配')
          return
        }
        let page
        if (item.type === '1') {
          page = {
            path: `/page/${item.pageKey}`,
            query: {}
          }
        } else if (item.type === '2') {
          page = {
            path: item.route,
            query: {}
          }
        }
        if (item.name) {
          page.query = { title: item.name }
        }
        if (data.menuRootAppId) {
          page.query.menuRootAppId = data.menuRootAppId
        }
        this.$router.push(page)
      }
    },
    showIcon(meta) {
      return meta && !!meta.iconPath && meta.iconPath.indexOf('.') > -1
    },
    showSvg(meta) {
      return meta && !!meta.iconPath
    },
    hasOneShowingChild(children = [], parent) {
      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 false
      }
      // Show parent if there are no child router to display
      if (showingChildren.length === 0) {
        this.onlyOneChild = { ...parent, path: '', noShowingChildren: true }
        return true
      }
      return false
    }
  }
}
</script>
<style lang="scss">
.menu-wrapper {
  margin-top: 6px;

  .el-submenu__title,
  .el-menu-item {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    color: rgb(236, 242, 251);
  }

  .el-submenu__title::after {
    content: '';
    position: absolute;
    bottom: 4px;
    right: 4px;
    border-bottom: 4px solid #757F8B;
    border-left: 4px solid transparent;
  }

  .el-menu-item:hover {
    .arrow {
      transform: rotate(90deg);
      transition: .3s;
    }

    .menu-m-icon {
      filter: brightness(100);
    }
  }

  .arrow {
    position: absolute;
    right: 1px;
    font-size: 12px;
  }

  .el-submenu:hover {
    .el-submenu__title::after {
      border-bottom: 4px solid white;
    }
    .el-submenu__title:hover{
      .menu-m-icon {
       filter: brightness(100);
     }
    }
  }
}
</style>