define([
  'lodash'
],
function (_) {
  'use strict';

  return {
    metricAggTypes: [
      {text: "Count",   value: 'count' },
      {text: "Average of",  value: 'avg' },
      {text: "Sum of",  value: 'sum' },
      {text: "Max of",  value: 'max' },
      {text: "Min of",  value: 'min' },
      {text: "Standard Deviations",  value: 'std_dev' },
      {text: "Percentiles",  value: 'percentiles' },
    ],

    bucketAggTypes: [
      {text: "Terms",           value: 'terms' },
      {text: "Date Histogram",  value: 'date_histogram' },
    ],

    orderByOptions: [
      {text: "Doc Count",  value: '_count' },
      {text: "Term value", value: '_term' },
    ],

    orderOptions: [
      {text: "Top",     value: 'desc' },
      {text: "Bottom",  value: 'asc' },
    ],

    sizeOptions: [
      {text: "No limit", value: '0' },
      {text: "1", value: '1' },
      {text: "2", value: '2' },
      {text: "3", value: '4' },
      {text: "5", value: '5' },
      {text: "10", value: '10' },
      {text: "15", value: '15' },
      {text: "20", value: '20' },
    ],

    getOrderByOptions: function(target) {
      var self = this;
      var metricRefs = [];
      _.each(target.metrics, function(metric) {
        if (metric.type !== 'count') {
          metricRefs.push({text: self.describeMetric(metric), value: metric.id});
        }
      });

      return this.orderByOptions.concat(metricRefs);
    },

    describeOrder: function(order) {
      var def = _.findWhere(this.orderOptions, {value: order});
      return def.text;
    },

    describeMetric: function(metric) {
      var def = _.findWhere(this.metricAggTypes, {value: metric.type});
      return def.text + ' ' + metric.field;
    },

    describeOrderBy: function(orderBy, target) {
      var def = _.findWhere(this.orderByOptions, {value: orderBy});
      if (def) {
        return def.text;
      }
      var metric = _.findWhere(target.metrics, {id: orderBy});
      if (metric) {
        return this.describeMetric(metric);
      } else {
        return "metric not found";
      }
    },
  };

});