airbnb/caravel

/**
 * 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 limitations
 * under the License.
 */
import { Metric } from '../types';

export default function mainMetric(savedMetrics?: Metric[] | null) {
  // Using 'count' as default metric if it exists, otherwise using whatever one shows up first
  let metric;
  if (savedMetrics && savedMetrics.length > 0) {
    savedMetrics.forEach(m => {
      if (m.metric_name === 'count') {
        metric = 'count';
      }
    });
    if (!metric) {
      metric = savedMetrics[0].metric_name;
    }
  }
  return metric;
}