/**
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * Thermostat is distributed under the GNU General Public License,
 * version 2 or any later version (with a special exception described
 * below, commonly known as the "Classpath Exception").
 *
 * A copy of GNU General Public License (GPL) is included in this
 * distribution, in the file COPYING.
 *
 * Linking Thermostat code with other modules is making a combined work
 * based on Thermostat.  Thus, the terms and conditions of the GPL
 * cover the whole combination.
 *
 * As a special exception, the copyright holders of Thermostat give you
 * permission to link this code with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on Thermostat code.  If you modify Thermostat, you may
 * extend this exception to your version of the software, but you are
 * not obligated to do so.  If you do not wish to do so, delete this
 * exception statement from your version.
 */

import big from 'big.js';

/**
 * Takes a metric object with numeric value
 * and converts it into a Big number Object.
 * Documentation for big.js: http://mikemcl.github.io/big.js/
 * @param {Object} metric e.g., '{ $numberLong: metric }'
 * @return {Big number Object}
 */
export class MetricToBigIntService {
  constructor () {
    this.big = big;
  }

  convert (metric) {
    if (!angular.isDefined(metric)) {
      return this.big(undefined);
    }
    // FIXME: https://trello.com/c/3jDpmy8M/170-clean-up-numberlong-ambiguities
    if (typeof metric === 'number') {
      metric = { $numberLong: metric.toString() };
    }
    return this.big(metric.$numberLong);
  }
}

export function init () {
  angular
    .module('app.services')
    .service('metricToBigIntService', MetricToBigIntService);
}