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  http://www.apache.org/licenses/LICENSE-2.0

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specific language governing permissions and limitations
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-->
<template>
  <el-card>
    <el-table
      border
      :data="taskMetric"
      empty-text="No data">
      <el-table-column label="ID" prop="id"/>
      <el-table-column label="State" align="center">
        <template slot-scope="scope">
          <el-tag :type="toStateType(scope.row.stateTransitionEvents)">
            {{ toStateText(scope.row.stateTransitionEvents) }}
          </el-tag>
        </template>
      </el-table-column>
      <el-table-column
        v-for="col in Object.keys(columns)"
        :label="columns[col]"
        :key="col"
        :prop="col"/>
    </el-table>
    <el-pagination :page-size="pageSize" :total="total" :current-page.sync="currentPage"></el-pagination>
  </el-card>
</template>

<script>
import { STATE } from '../assets/constants';

const COLUMNS = {
  'serializedReadBytes': 'Bytes read (compressed)',
  'encodedReadBytes': 'Bytes read',
  'writtenBytes': 'Bytes written',
  'boundedSourceReadTime': 'Source read time',
  'containerId': 'Container ID',
}

const TASKS_PER_PAGE = 20

export default {
  props: ['taskStatistics'],

  data: function() {
    return {
      columns: COLUMNS,
      pageSize: TASKS_PER_PAGE,
      currentPage: 1.
    };
  },

  //COMPUTED
  computed: {
    total() {
      return this.taskStatistics.tableView.length
    },

    /**
     * Computed property which consists table data.
     */
    taskMetric() {
      return this.taskStatistics.tableView.slice((this.currentPage - 1) * TASKS_PER_PAGE, this.currentPage * TASKS_PER_PAGE)
    },
  },

  //METHODS
  methods: {
    /**
     * Fetch last stateTransitionEvents element and extract
     * newState property. See STATE constant.
     * @returns newState of last stateTransitionEvents array
     */
    toStateText(e) {
      return e[e.length - 1].newState;
    },

    /**
     * Helper function for converting state to element-ui type string.
     * @param e state.
     * @returns element-ui type string.
     */
    toStateType(e) {
      let t = this.toStateText(e);
      switch (t) {
        case STATE.READY:
        case STATE.INCOMPLETE:
          return 'info';
        case STATE.EXECUTING:
          return '';
        case STATE.COMPLETE:
          return 'success';
        case STATE.FAILED:
          return 'danger';
        case STATE.ON_HOLD:
        case STATE.SHOULD_RETRY:
          return 'warning';
        default:
          return '';
      }
    }
  },


}
</script>