/**
 * 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.
 */

var App = require('app');

/**
 *
 */
App.MainChartHeatmapYarnResourceUsedMetric = App.MainChartHeatmapYarnMetrics.extend({
  name: Em.I18n.t('charts.heatmap.metrics.YarnMemoryUsed'),
  maximumValue: 100,
  defaultMetric: 'metrics.yarn',
  units: ' %',
  slotDefinitionLabelSuffix: ' %',

  metricMapper: function (json) {
    var hostToValueMap = {};
    var self = this;
    var metricName = this.get('defaultMetric');
    if (json.host_components) {
      var props = metricName.split('.');
      json.host_components.forEach(function (host) {
        var value = host;
        props.forEach(function (prop) {
          if (value != null && prop in value) {
            value = value[prop];
          } else {
            value = null;
          }
        });
        if (value != null) {
          value = self.memoryUsageFormatted(value.AllocatedGB, value.AvailableGB + value.AllocatedGB);
          var hostName = host.HostRoles.host_name;
          hostToValueMap[hostName] = value;
        }
      });
    }
    return hostToValueMap;
  },

  /**
   * Format percent YARN memory used to float with 2 digits
   */
  memoryUsageFormatted: function(used, total) {
    var usage = (used) / total * 100;
    if (isNaN(usage) || usage < 0 || usage > 100) {
      return Em.I18n.t('charts.heatmap.unknown');
    }
    var s = usage.toFixed(1);
    return isNaN(s) ? 0 : s;
  }
});
