add user data link on Topcoder MarathonMatch standings

manifest.json

{
  "manifest_version": 2,
  "name": "add user data link on Topcoder MarathonMatch standings",
  "version": "1.0",
  "author": "Leonardone",
  "description": "add user data link on Topcoder MarathonMatch standings",
  
  "content_scripts": [
    {
      "matches": ["*://community.topcoder.com/longcontest/*"],
      "include_globs": ["*ViewStandings*", "*ViewOverview*"],
      "js": ["script.js"]
    }
  ]
}

script.js

// script.js
// Browser WebExtention
// add user data link on Topcoder MarathonMatch standings
// author: Leonardone

(function() {
// start of code

var protocol = 'https';
var server = 'community.topcoder.com';
var mmHistory = 'tc?module=SimpleStats&c=long_comp_history&d1=statistics&d2=longHistory&cr=';
var algoHistory = 'tc?module=AlgoCompetitionHistory&cr=';
var paymentSummary = 'tc?module=PaymentSummary&cr=';
var achievements = 'tc?module=SimpleStats&c=coder_achievements&d1=statistics&d2=coderAchievements&cr=';
var exampleResults = 'longcontest/?module=ViewExampleResults&pm=PM&rd=RD&cr=';

function getMMHistoryUrl(id, pm, rd) {
    return protocol + '://' + server + '/' + mmHistory + id;
}

function getAlgoHistoryUrl(id, pm, rd) {
    return protocol + '://' + server + '/' + algoHistory + id;
}

function getPaymentSummaryUrl(id, pm, rd) {
    return protocol + '://' + server + '/' + paymentSummary + id;
}

function getAchievementsUrl(id, pm, rd) {
    return protocol + '://' + server + '/' + achievements + id;
}

function getExampleResultsUrl(id, pm, rd) {
    var cmd  = exampleResults.replace('PM', pm).replace('RD', rd);
    return protocol + '://' + server + '/' + cmd + id;
}

var texts = ['Example Results', 'MM history', 'Algo history', 'Achievements', 'Payment summary'];
var funcs = [getExampleResultsUrl, getMMHistoryUrl, getAlgoHistoryUrl, getAchievementsUrl, getPaymentSummaryUrl];

var coders = [];
var rd = '';
var pm = '';

var elms = document.getElementsByTagName('a');
for (i = 0; i < elms.length; i++) {
	var e = elms[i];
	var cn = e.className.toString();
	if (!cn.match(/coderText\w+/)) {
        var href = e.href.toString();
        if (href.indexOf('ViewProblemStatement') >= 0) {
            var ms = href.match(/pm=(\d+)/);
            if (ms) {
                pm = ms[1];
            }
            ms = href.match(/rd=(\d+)/);
            if (ms) {
                rd = ms[1];
            }
        }
		continue;
	}
    var id = e.href.toString().match(/cr=(\d+)/)[1];
    var a = document.createElement('a');
    a.href = funcs[0](id, pm, rd);
    a.target = '_blank';
    a.innerHTML = '&nbsp;link';
    e.parentNode.appendChild(a);
	var c = coders.length;
	coders[c] = [id, a];
}

var showType = 0;

var tbhs = document.getElementsByClassName('statTableHolder');
if (tbhs.length !== 1) {
    tbhs = document.getElementsByClassName('stat');
    if (tbhs.length !== 1) {
        alert('failed webextention');
        return;
    }
}
var tbh = tbhs[0];
var tbhp = tbh.parentNode;
var cont = document.createElement('div');
var btn = document.createElement('input');
btn.type = 'button';
btn.value = 'switch';
cont.appendChild(btn);
var span = document.createElement('span');
span.innerHTML = '&nbsp;link is ' + texts[0];
cont.appendChild(span);
tbhp.insertBefore(cont, tbh);

btn.onclick = function() {
    showType = (showType + 1) % Math.min(texts.length, funcs.length);
    var f = funcs[showType];
    for (var j = 0; j < coders.length; j++) {
        coders[j][1].href = f(coders[j][0], pm, rd);
    }
    span.innerHTML = '&nbsp;link is ' + texts[showType];
};

// end of code
})();