angarg12 / nucleogenesis

'use strict';

angular

  .module('game')

  .service('util', ['numberFilter',

    '$sce',

    '$locale',

    'data',

    function(numberFilter, $sce, $locale, data) {

      let formats = $locale.NUMBER_FORMATS;

      this.gaussian = new Ziggurat();

      this.getHTML = function(resource) {

        let html = data.html[resource];

        if (typeof html === 'undefined') {

          html = data.resources[resource].html;

        }

        if (typeof html === 'undefined') {

          return resource;

        }

        return html;

      };

      this.prettifyNumber = function(number) {

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

          return null;

        }

        if (number === '') {

          return '';

        }

        if (number === Infinity) {

          return '∞';

        }

        if (number > 1e6) {

          // Very ugly way to extract the mantisa and exponent from an exponential string

          let exponential = number.toPrecision(6).split('e');

          let exponent = parseFloat(exponential[1].split('+')[1]);

          // And it is displayed in with superscript

          return numberFilter(exponential[0], 4) +

            ' &#215; 10<sup>' +

            this.prettifyNumber(exponent) +

            '</sup>';

        }

        return mangleCeroes(number, 4);

      };

      // FIXME: it turns out we need this abomination since default numberFilter

      // uses 3 decimals and we need 4 (for the isotopes proportions precision)

      // and if you use decimals, it attaches 0's at the end

      function mangleCeroes(input, fractionSize) {

        //Get formatted value

        let formattedValue = numberFilter(input, fractionSize);

        //get the decimalSepPosition

        let decimalIdx = formattedValue.indexOf(formats.DECIMAL_SEP);

        //If no decimal just return

        if (decimalIdx === -1) {

          return formattedValue;

        }

        let whole = formattedValue.substring(0, decimalIdx);

        let decimal = (Number(formattedValue.substring(decimalIdx)) || '').toString();

        return whole + decimal.substring(1);

      }

      this.randomDraw = function(number, p) {

        let production;

        let mean = number * p;

        if (p < 0.01) {

          // using Poisson distribution (would get slow for large numbers. there are fast formulas but I don't know

          // how good they are)

          production = this.poisson.getPoisson(mean);

        } else {

          // 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;

      };

  ]);