text: /*
   * Licensed to Elasticsearch B.V. under one or more contributor
   * license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright
   * ownership. Elasticsearch B.V. licenses this file to you under
   * the Apache License, Version 2.0 (the "License"); you may
   * not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import { toArray } from 'lodash';
  import { HierarchicalTooltipFormatterProvider } from './_hierarchical_tooltip_formatter';
  
  export function BuildHierarchicalDataProvider(Private) {
    const tooltipFormatter = Private(HierarchicalTooltipFormatterProvider);
  
    return function (table) {
      let slices;
      const names = {};
      if (table.columns.length === 1) {
        slices = [{ name: table.columns[0].title, size: table.rows[0][0].value }];
        names[table.columns[0].title] = table.columns[0].title;
      } else {
        let parent;
        slices = [];
        table.rows.forEach(row => {
          let dataLevel = slices;
          // we always have one bucket column and one metric column (for every level)
          for (let columnIndex = 0; columnIndex < table.columns.length; columnIndex += 2) {
            const { aggConfig } = table.columns[columnIndex];
            const fieldFormatter = aggConfig.fieldFormatter('text');
            const bucketColumn = row[columnIndex];
            const metricColumn = row[columnIndex + 1];
            const name = fieldFormatter(bucketColumn.value);
            const size = metricColumn.value;
            names[name] = name;
  
            let slice  = dataLevel.find(slice => slice.name === name);
            if (!slice) {
              slice = { name, size, parent, aggConfig, aggConfigResult: bucketColumn, children: [] };
              dataLevel.push(slice);
            }
            parent = slice;
            dataLevel = slice.children;
          }
        });
      }
  
      return {
        hits: table.rows.length,
        raw: table,
        names: toArray(names),
        tooltipFormatter: tooltipFormatter(table.columns),
        slices: {
          children: [
            ...slices
          ]
        }
      };
    };
  }
  