<template>
  <el-breadcrumb class="app-breadcrumb hidden-sm-and-down" separator="/">
    <transition-group appear name="breadcrumb">
      <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
        <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>
import {defineComponent, ref, watch} from 'vue'
import {useRoute, useRouter} from 'vue-router'

export default defineComponent({
  name: 'BreadCrumb',
  setup() {
    const levelList = ref([])
    const route = useRoute()
    const router = useRouter()
    const getBreadcrumb = () => {
      let matched = route.matched.filter((item) => item.meta && item.meta.title)
      const first = matched[0]
      levelList.value = matched.filter((item) => item.meta && item.meta.title && item.meta.breadcrumb !== false)
    }
    getBreadcrumb()
    watch(
        () => route.path,
        () => getBreadcrumb()
    )
    const handleLink = (item) => {
      const {redirect, path} = item
      if (redirect) {
        router.push(redirect.toString())
        return
      }
      router.push(path)
    }
    return {levelList, handleLink}
  },
})
</script>

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

  .no-redirect {
    color: var(--system-header-breadcrumb-text-color);
    cursor: text;
  }

  a {
    color: var(--system-header-text-color);
  }
}
</style>
