<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
        <span class="no-redirect">{{ item.meta.title }}</span>
        <!--        <span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{ item.meta.title }}</span>-->
        <!--        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>-->
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script setup>
import _ from 'lodash'
import { useRoute, useRouter } from 'vue-router'
import { ref, watchEffect } from 'vue'

const route = useRoute()
const router = useRouter()
const levelList = ref([])

function getBreadcrumb() {
  // only show routes with meta.title
  let matched = route.matched.filter(item => item.meta && item.meta.title)
  const first = matched[0]
  // 判断是否为首页
  if (!isDashboard(first)) {
    matched = [{ path: '/index', meta: { title: '首页' }}].concat(matched)
  }

  const arr = []
  getLevelList(matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false), arr)
  levelList.value = _.reverse(arr)
  // levelList.value = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
}

function getLevelList(list, resultArr) {
  return _.some(list, (l) => {
    if (route.name == l.name) {
      resultArr.push(l)
      return true
    } else if (l.children && l.children.length > 0) {
      const found = getLevelList(l.children, resultArr)
      if (found) {
        resultArr.push(l)
      }
      return found
    } else {
      return false
    }
  })
}

function isDashboard(route) {
  const name = route && route.name
  if (!name) {
    return false
  }
  return name.trim() === 'Index'
}
function handleLink(item) {
  const { redirect, name } = item
  if (redirect) {
    router.push(redirect)
    return
  }
  router.push({
    name: name
  })
}

watchEffect(() => {
  // if you go to the redirect page, do not update the breadcrumbs
  if (route.path.startsWith('/redirect/')) {
    return
  }
  getBreadcrumb()
})
// getBreadcrumb()
</script>

<style lang='scss' scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>