<template>
  <div class="app-container">
    <!-- Note that row-key is necessary to get a correct row order. -->
    <el-table
      ref="dragTable"
      v-loading="listLoading"
      :data="list"
      row-key="id"
      border
      fit
      highlight-current-row
      style="width: 100%"
    >
      <el-table-column
        align="center"
        label="ID"
        width="65"
      >
        <template slot-scope="{row}">
          <span>{{ row.id }}</span>
        </template>
      </el-table-column>

      <el-table-column
        width="180px"
        align="center"
        label="Date"
      >
        <template slot-scope="{row}">
          <span>{{ row.timestamp | parseTime('{y}-{m}-{d} {h}:{i}') }}</span>
        </template>
      </el-table-column>

      <el-table-column
        min-width="300px"
        label="Title"
      >
        <template slot-scope="{row}">
          <span>{{ row.title }}</span>
        </template>
      </el-table-column>

      <el-table-column
        width="110px"
        align="center"
        label="Author"
      >
        <template slot-scope="{row}">
          <span>{{ row.author }}</span>
        </template>
      </el-table-column>

      <el-table-column
        width="100px"
        label="Importance"
      >
        <template slot-scope="{row}">
          <svg-icon
            v-for="n in + row.importance"
            :key="n"
            icon-class="star"
            class="icon-star"
          />
        </template>
      </el-table-column>

      <el-table-column
        align="center"
        label="Readings"
        width="95"
      >
        <template slot-scope="{row}">
          <span>{{ row.pageviews }}</span>
        </template>
      </el-table-column>

      <el-table-column
        class-name="status-col"
        label="Status"
        width="110"
      >
        <template slot-scope="{row}">
          <el-tag :type="row.status | statusFilter">
            {{ row.status }}
          </el-tag>
        </template>
      </el-table-column>

      <el-table-column
        align="center"
        label="Drag"
        width="80"
      >
        <template slot-scope="{}">
          <svg-icon
            class="drag-handler"
            icon-class="drag"
          />
        </template>
      </el-table-column>
    </el-table>
    <!-- $t is vue-i18n global function to translate lang (lang in @/lang)  -->
    <div class="show-d">
      <el-tag style="margin-right:12px;">{{ $t('table.dragTips1') }} :</el-tag> {{ oldList }}
    </div>
    <div class="show-d">
      <el-tag>{{ $t('table.dragTips2') }} :</el-tag> {{ newList }}
    </div>
  </div>
</template>

<script>
import { fetchList } from '@/api/article'
import Sortable from 'sortablejs'

export default {
  name: 'DragTable',
  filters: {
    statusFilter(status) {
      const statusMap = {
        published: 'success',
        draft: 'info',
        deleted: 'danger'
      }
      return statusMap[status]
    }
  },
  data() {
    return {
      list: null,
      total: null,
      listLoading: true,
      listQuery: {
        page: 1,
        limit: 10
      },
      sortable: null,
      oldList: [],
      newList: []
    }
  },
  created() {
    this.getList()
  },
  methods: {
    async getList() {
      this.listLoading = true
      const { data } = await fetchList(this.listQuery)
      this.list = data.items
      this.total = data.total
      this.listLoading = false
      this.oldList = this.list.map(v => v.id)
      this.newList = this.oldList.slice()
      this.$nextTick(() => {
        this.setSort()
      })
    },
    setSort() {
      const el = this.$refs.dragTable.$el.querySelectorAll(
        '.el-table__body-wrapper > table > tbody'
      )[0]
      this.sortable = Sortable.create(el, {
        ghostClass: 'sortable-ghost', // Class name for the drop placeholder,
        setData: function(dataTransfer) {
          // to avoid Firefox bug
          // Detail see : https://github.com/RubaXa/Sortable/issues/1012
          dataTransfer.setData('Text', '')
        },
        onEnd: evt => {
          const targetRow = this.list.splice(evt.oldIndex, 1)[0]
          this.list.splice(evt.newIndex, 0, targetRow)

          // for show the changes, you can delete in you code
          const tempIndex = this.newList.splice(evt.oldIndex, 1)[0]
          this.newList.splice(evt.newIndex, 0, tempIndex)
        }
      })
    }
  }
}
</script>

<style>
.sortable-ghost {
  opacity: 0.8;
  color: #fff !important;
  background: #42b983 !important;
}
</style>

<style scoped>
.icon-star {
  margin-right: 2px;
}
.drag-handler {
  width: 20px;
  height: 20px;
  cursor: pointer;
}
.show-d {
  margin-top: 15px;
}
</style>