<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>