airbnb/caravel

/* eslint-disable camelcase */
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 limitationsxw
 * under the License.
 */
import { getMetricLabel, ensureIsArray } from '@superset-ui/core';
import { PostProcessingFactory } from '../types';
import { TIME_COMPARISON_SEPARATOR } from './constants';

export const getMetricOffsetsMap: PostProcessingFactory<Map<string, string>> = (
  formData,
  queryObject,
) => {
  /*
    return metric offset-label and metric-label hashmap, for instance:
    {
      "SUM(value)__1 year ago": "SUM(value)",
      "SUM(value)__2 year ago": "SUM(value)"
    }
  */
  const queryMetrics = ensureIsArray(queryObject.metrics);
  const timeOffsets = ensureIsArray(formData.time_compare);

  const metricLabels = queryMetrics.map(getMetricLabel);
  const metricOffsetMap = new Map<string, string>();
  metricLabels.forEach((metric: string) => {
    timeOffsets.forEach((offset: string) => {
      metricOffsetMap.set(
        [metric, offset].join(TIME_COMPARISON_SEPARATOR),
        metric,
      );
    });
  });

  return metricOffsetMap;
};