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Websim: Battle Profitability Indicator

Indicates the battle profitability in WebSim

// ==UserScript==
// @name           Websim: Battle Profitability Indicator
// @description    Indicates the battle profitability in WebSim
// @namespace      Vess
// @author   Vesselin Bontchev
// @date           2012-07-16
// @version        1.01
// @include        http*://websim.speedsim.net/*
// ==/UserScript==

(function ()
{    
    var strFunc = (function ()
    {
        var parse_ajax_answer_old = parse_ajax_answer;
        parse_ajax_answer = function (txt)
        {
            // Resource exchange ratio; default 3:2:1
            const metalCrystalRatio   = 1.5;
            const metalDeuteriumRatio = 3;
            function setIndicator (result, indicatorNumber, profit, loss)
            {
                function addDots (n)
                {
                    n += '';
                    while (/\d{4}/.test (n))
                        n = n.replace (/(\d+)(\d{3})/, "$1.$2");
                    return n;
                }
                var indicatorColor;
                var indicatorText = "";
                var mySpan = document.getElementById ("id" + indicatorNumber);
                if (mySpan == null)
                {
                    mySpan = document.createElement ("span");
                    mySpan.id = "id" + indicatorNumber;
                    result.appendChild (document.createTextNode ((indicatorNumber == "1") ? " " : " ("));
                    result.appendChild (mySpan);
                    if (indicatorNumber == "2")
                        result.appendChild (document.createTextNode (")"));
                }
                if (profit > loss)
                {
                    indicatorText += "+";
                    indicatorColor = "lime";
                }
                else if (profit < loss)
                {
                    indicatorText += "-";
                    indicatorColor = "red";
                }
                else
                {
                    indicatorText += "=";
                    indicatorColor = "orange";
                }
                indicatorText += addDots (Math.abs (profit - loss));
                mySpan.style.color = indicatorColor;
                mySpan.textContent = indicatorText;
            }
            parse_ajax_answer_old (txt);
            var resultTable = document.getElementById ("result_table");
            var result = resultTable.previousElementSibling;
            var rows = resultTable.firstElementChild.firstElementChild.children;
            var debris  = rows [2].cells [1].textContent;
            var losses  = rows [4].cells [1].textContent;
            var plunder = rows [7].cells [1].textContent;
            var fuel    = rows [8].cells [1].textContent;
            /([\d\.]+)\D+\d+\D+([\d\.]+)/.exec (debris);
            var debrisMetal   = RegExp.$1;
            var debrisCrystal = RegExp.$2;
            var debrisProfit = parseInt (debrisMetal.replace (/\D/g, "")) + Math.round (metalCrystalRatio * parseInt (debrisCrystal.replace (/\D/g, "")));
            /([\d\.]+)\D+([\d\.]+)\D+([\d\.]+)/.exec (plunder);
            var plunderMetal     = RegExp.$1;
            var plunderCrystal   = RegExp.$2;
            var plunderDeuterium = RegExp.$3;
            var plunderProfit = parseInt (plunderMetal.replace (/\D/g, "")) +
                Math.round (metalCrystalRatio   * parseInt (plunderCrystal.replace   (/\D/g, ""))) +
                Math.round (metalDeuteriumRatio * parseInt (plunderDeuterium.replace (/\D/g, "")));
            /([\d\.]+)\D+([\d\.]+)\D+([\d\.]+)/.exec (losses);
            var lossesMetal     = RegExp.$1;
            var lossesCrystal   = RegExp.$2;
            var lossesDeuterium = RegExp.$3;
            var equivLosses = parseInt (lossesMetal.replace (/\D/g, "")) +
                Math.round (metalCrystalRatio   * parseInt (lossesCrystal.replace   (/\D/g, ""))) +
                Math.round (metalDeuteriumRatio * parseInt (lossesDeuterium.replace (/\D/g, ""))) +
                Math.round (metalDeuteriumRatio * parseInt (fuel.replace (/\D/g, "")));
            var totalProfit = plunderProfit + debrisProfit;
            setIndicator (result, "1", plunderProfit, equivLosses);
            setIndicator (result, "2", totalProfit, equivLosses);
        }
    }).toString ();
    var script = document.createElement ("script");
    script.setAttribute ("type", "text/javascript");
    script.text = "(" + strFunc + ") ();";
    document.body.appendChild (script);
})();