<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"
        >{{ $t(item.meta.title) }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ $t(item.meta.title) }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
  import pathToRegexp from 'path-to-regexp'

  export default {
    data() {
      return {
        levelList: null
      }
    },
    watch: {
      $route() {
        this.getBreadcrumb()
      }
    },
    created() {
      this.getBreadcrumb()
    },
    methods: {
      getBreadcrumb() {
        let matched = this.$route.matched.filter(item => item.name)

        const first = matched[0]
        if (first && first.name !== 'Home') {
          matched = [{ path: '/home', meta: { title: 'Home' }}].concat(matched)
        }

        this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
      },
      pathCompile(path) {
        // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
        const { params } = this.$route
        var toPath = pathToRegexp.compile(path)
        return toPath(params)
      },
      handleLink(item) {
        const { redirect } = item
        if (redirect) {
          this.$router.push(redirect)
          return
        }
        this.$router.push(this.getGoToPath(item))
      },
      getGoToPath(item) {
        if (item.path) {
          var path = item.path
          var startPos = path.indexOf(':')

          if (startPos !== -1) {
            var endPos = path.indexOf('/', startPos)
            var key = path.substring(startPos + 1, endPos)
            path = path.replace(':' + key, this.$route.params[key])
            return path
          }
        }

        return item.redirect || item.path
      }
    }
  }
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
  .app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 10px;

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