angarg12 / nucleogenesis

/* globals numberformat */

/**

 util

 Utility service with misc. functions.

 @namespace Services

 */

'use strict';

angular

  .module('game')

  .service('util', ['prettyNumberFilter',

    '$sce',

    'data',

    'state',

    function(prettyNumber, $sce, data, state) {

      this.gaussian = new Ziggurat();

      /* Return the HTML representation of an element, or the element itself

      if it doesn't have one */

      this.prettifyNumber = function(number) {

        if (typeof number === 'undefined' || number === null) {

          return null;

        }

        if (number === '') {

          return '';

        }

        if (number === Infinity) {

          return '∞';

        }

        if (number === 0) {

          return '0';

        }

        return numberformat.format(number, state.player.numberformat);

      };

      this.randomDraw = function(number, p) {

        let production;

        let mean = number * p;

        // Gaussian distribution

        let q = 1 - p;

        let variance = number * p * q;

        let std = Math.sqrt(variance);

        production = Math.round(this.gaussian.nextGaussian() * std + mean);

        if (production > number) {

          production = number;

        }

        if (production < 0) {

          production = 0;

        }

        return production;

      };

      this.trustHTML = function(html) {

        return $sce.trustAsHtml(html);

      };

    }

  ]);