<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <transition-group 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 setup>
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 = matched
  }

  levelList.value = matched.filter(
    (item) => item.meta && item.meta.title && item.meta.breadcrumb !== false
  )
}
function isDashboard(route) {
  const name = route && route.name
  if (!name) {
    return false
  }
  return name.trim() === 'Index'
}
function handleLink(item) {
  const { redirect, path } = item
  if (redirect) { 
    router.push(redirect)
    return
  } 
  router.push(path)
}

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-flex;
  align-items: center;
  height: 56px;
  font-size: 16px;
  line-height: 1;
  margin-left: 8px;

  .no-redirect {
    color: #333333;
    font-weight: 600;
    cursor: text;
  }
}
::v-deep .el-breadcrumb__separator {
  color: #333333;
}
</style>
