<template>
  <div>
    <div class="btn_group">层级选项：
      <el-button @click="expandedLevel(index)" v-for="index in leave" :key="index">{{index}}</el-button>
    </div>
    <el-table
      :data="formatData"
      :rowHeight="rowHeight"
      :height="height"
      :useVirtual="true"
      border
      v-bind="$attrs">
      <!--<el-table-column align="left" v-if="formatColumns.length===0" width="150">-->
        <!--<template slot-scope="scope">-->
          <!--<span v-for="space in scope.row._level" :key="space" class="ms-tree-space"/>-->
          <!--<span v-if="iconShow(0,scope.row)" class="tree-ctrl" @click="toggleExpanded(scope.$index)">-->
            <!--<i v-if="!scope.row._expanded" class="el-icon-plus"/>-->
            <!--<i v-else class="el-icon-minus"/>-->
          <!--</span>-->
          <!--{{ scope.$index }}-->
        <!--</template>-->
      <!--</el-table-column>-->
      <!--<el-table-column align="left" v-if="formatColumns.length!==0" header-align="center" width="150">-->
      <!--</el-table-column>-->
      <!--<el-table-column align="left" v-for="(column, index) in columns" v-else :key="column.value" :label="column.text" :width="column.width" show-overflow-tooltip>-->
        <!--<template slot-scope="scope">-->
          <!--&lt;!&ndash; eslint-disable-next-line vue/no-confusing-v-for-v-if &ndash;&gt;-->
          <!--<span v-for="space in scope.row._level" v-if="index === 0" :key="space" class="ms-tree-space"/>-->
          <!--<span v-if="iconShow(index,scope.row,scope)" class="tree-ctrl" @click="toggleExpanded(scope.$index)">-->
            <!--<i v-if="!scope.row._expanded" class="el-icon-arrow-right"/>-->
            <!--<i v-else class="el-icon-arrow-down"/>-->
          <!--</span>-->
          <!--{{ scope.row[column.value] }}-->
        <!--</template>-->
      <!--</el-table-column>-->
      <ChildrenColumns :formatDataArr="formatData" :iconShow="iconShow" :toggleExpanded="toggleExpanded" :columnsArr="formatColumns"></ChildrenColumns>
      <slot></slot>
    </el-table>
  </div>
</template>

<script>
import treeToArray from './eval'
import ChildrenColumns from './ChildrenColumns'
export default {
  name: 'TreeTable',
  props: {
    /* eslint-disable */
    data: {
      type: [Array, Object],
      required: true
    },
    columns: {
      type: Array,
      default: () => []
    },
    evalFunc: Function,
    expandAll: {
      type: Boolean,
      default: false
    },
    leave: {
      type: Number,
      default: 7
    },
    height: {
      type: Number,
      default: 600
    },
    rowHeight: {
      type: Number,
      default: 48
    }
  },
  data(){
    return {
      tableData:[],
      formatColumns: []
    }
  },
  components: {
    ChildrenColumns
  },
  created() {
    this.columns.unshift({
      text: '序号',
      value: 'addNum',
      width: 120
    })
    let columnsLength = this.columns.length
    let dellast = this.columns.splice(columnsLength-1, 1)
    this.columns.unshift(dellast)
    this.formatColumns = this.columns

    console.log(this.formatColumns)
  },
  computed: {
    // 格式化数据源
    formatData: function() {
      let tmp
      if (!Array.isArray(this.data)) {
        tmp = [this.data]
      } else {
        tmp = this.data
      }
      const func = this.evalFunc || treeToArray
      const args = this.evalArgs ? Array.concat([tmp, this.expandAll], this.evalArgs) : [tmp, this.expandAll]
      console.time('treeToArray转化用时：')
      this.tableData = func.apply(null, args)
      console.timeEnd('treeToArray转化用时：')

      console.time('showRow转化用时：')
      this.showRow(this.tableData)
      console.timeEnd('showRow转化用时：')

      console.time('newTableData转化用时：')
      var newTableData = this.tableData.filter(function (el, index, self) {
        var isNew = el.parent ? (el.parent._show && el.parent._expanded) : true
        if (isNew) {
          return el
        }
      })
      console.timeEnd('newTableData转化用时：')
      return newTableData
    }
  },
  methods: {
    showRow: function(tableData) {
      tableData.forEach(function(row) {
        row._show = row.parent ? (row.parent._expanded && row.parent._show) : true
      });
      // row.row._show = show
      // return ''
      // return show ? 'animation:treeTableShow 1s;-webkit-animation:treeTableShow 1s;' : 'display:none;'
      // return show ? 'display:block' : 'display:none;position:absolute;top:99999px;left:-9999px'
    },
    // 切换下级是否展开
    toggleExpanded: function(trIndex) {
      const record = this.formatData[trIndex]
      record._expanded = !record._expanded
    },
    // 图标显示
    iconShow(index, record) {
      return (index === 1 && record.children && record.children.length > 0)
    },
    expandedLevel: function(level) {
      this.tableData.forEach(function(record) {
        record._expanded = record._level < level;
      });
    },
  }
}
</script>
<style rel="stylesheet/css">
  @keyframes treeTableShow {
    from {opacity: 0;}
    to {opacity: 1;}
  }
  @-webkit-keyframes treeTableShow {
    from {opacity: 0;}
    to {opacity: 1;}
  }
</style>

<style lang="scss" rel="stylesheet/scss" scoped>
  $color-blue: #2196F3;
  $space-width: 14px;
  .ms-tree-space {
    position: relative;
    top: 1px;
    display: inline-block;
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    width: $space-width;
    height: 14px;
    &::before {
      content: ""
    }
  }
  .processContainer{
    width: 100%;
    height: 100%;
  }
  table td {
    line-height: 26px;
  }

  .tree-ctrl{
    position: relative;
    cursor: pointer;
    color: $color-blue;
    margin-left: -$space-width;
  }
</style>
