(function () {

    /*
    if (typeof (window.QW_AB_VERSION) === 'undefined') {
        window.QW_AB_VERSION = 'site2021';
    }*/

    // The websites that need these parameters to be injected.
    var targetWebsites = [
        'social.quizwitz.com',
        'app.quizwitz.com',
        'accounts.catlab.eu'
    ];

    function isTargetWebsite(href) {
        for (var i = 0; i < targetWebsites.length; i ++) {
            if (("" + href).indexOf(targetWebsites[i]) > -1) {
                return true;
            }
        }
        return false;
    }

    function getRefQueryParam(name) {
        name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
        var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
        var results = regex.exec(location.search);
        return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
    }

    function setCookie(name, value, days) {
        var expires = "";
        if (days) {
            var date = new Date();
            date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
            expires = "; expires=" + date.toUTCString();
        }
        document.cookie = name + "=" + (value || "") + expires + "; path=/";
    }

    function getCookie(name) {
        var nameEQ = name + "=";
        var ca = document.cookie.split(';');
        for (var i = 0; i < ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
        }
        return null;
    }

    function eraseCookie(name) {
        document.cookie = name + '=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
    }

    function isBot() {
        var botPattern = "(googlebot\/|bot|Googlebot-Mobile|Googlebot-Image|Google favicon|Mediapartners-Google|bingbot|slurp|java|wget|curl|Commons-HttpClient|Python-urllib|libwww|httpunit|nutch|phpcrawl|msnbot|jyxobot|FAST-WebCrawler|FAST Enterprise Crawler|biglotron|teoma|convera|seekbot|gigablast|exabot|ngbot|ia_archiver|GingerCrawler|webmon |httrack|webcrawler|grub.org|UsineNouvelleCrawler|antibot|netresearchserver|speedy|fluffy|bibnum.bnf|findlink|msrbot|panscient|yacybot|AISearchBot|IOI|ips-agent|tagoobot|MJ12bot|dotbot|woriobot|yanga|buzzbot|mlbot|yandexbot|purebot|Linguee Bot|Voyager|CyberPatrol|voilabot|baiduspider|citeseerxbot|spbot|twengabot|postrank|turnitinbot|scribdbot|page2rss|sitebot|linkdex|Adidxbot|blekkobot|ezooms|dotbot|Mail.RU_Bot|discobot|heritrix|findthatfile|europarchive.org|NerdByNature.Bot|sistrix crawler|ahrefsbot|Aboundex|domaincrawler|wbsearchbot|summify|ccbot|edisterbot|seznambot|ec2linkfinder|gslfbot|aihitbot|intelium_bot|facebookexternalhit|yeti|RetrevoPageAnalyzer|lb-spider|sogou|lssbot|careerbot|wotbox|wocbot|ichiro|DuckDuckBot|lssrocketcrawler|drupact|webcompanycrawler|acoonbot|openindexspider|gnam gnam spider|web-archive-net.com.bot|backlinkcrawler|coccoc|integromedb|content crawler spider|toplistbot|seokicks-robot|it2media-domain-crawler|ip-web-crawler.com|siteexplorer.info|elisabot|proximic|changedetection|blexbot|arabot|WeSEE:Search|niki-bot|CrystalSemanticsBot|rogerbot|360Spider|psbot|InterfaxScanBot|Lipperhey SEO Service|CC Metadata Scaper|g00g1e.net|GrapeshotCrawler|urlappendbot|brainobot|fr-crawler|binlar|SimpleCrawler|Livelapbot|Twitterbot|cXensebot|smtbot|bnf.fr_bot|A6-Indexer|ADmantX|Facebot|Twitterbot|OrangeBot|memorybot|AdvBot|MegaIndex|SemanticScholarBot|ltx71|nerdybot|xovibot|BUbiNG|Qwantify|archive.org_bot|Applebot|TweetmemeBot|crawler4j|findxbot|SemrushBot|yoozBot|lipperhey|y!j-asr|Domain Re-Animator Bot|AddThis)";
        var re = new RegExp(botPattern, 'i');
        var userAgent = navigator.userAgent;
        if (re.test(userAgent)) {
            return true;
        }
        return false;
    }

    var utmParamQueryString = '';
    function initialize() {

        if (isBot()) {
            return;
        }

        var parametersToMonitor = ["utm_abversion","utm_referrer","utm_source","utm_medium","utm_campaign","utm_term","utm_content","_ga","_gac","pk_vid","_gl","_cc"];

        if (window.QW_AB_VERSION) {
            utmParamQueryString = '&utm_abversion=' + window.QW_AB_VERSION;
        }

        var value;
        for (var i = 0; i < parametersToMonitor.length; i ++) {
            value = getRefQueryParam(parametersToMonitor[i])
            if (value) {
                setCookie(parametersToMonitor[i], value, 1);
            } else {
                value = getCookie(parametersToMonitor[i])
            }

            if (value) {
                utmParamQueryString += '&' + parametersToMonitor[i] + '=' + encodeURIComponent(value);
            }
        }

        if (utmParamQueryString.length > 0) {
            utmParamQueryString = utmParamQueryString.substring(1);
        }

        injectUtmParamsInLinks();
    }

    function injectUtmParamsInLinks() {
        if (!utmParamQueryString) return;
        var navLinks = document.querySelectorAll('a');

        navLinks.forEach(function (item) {

            if (!isTargetWebsite(item.href)) {
                return;
            }

            if (item.dataset.utmFixed) {
                return;
            }

            item.dataset.utmFixed = true;

            //if (item.href.indexOf('/') === 0 || item.href.indexOf(location.host) !== -1) {
            if (item.href.indexOf('?') === -1) {
                item.href += '?';
            } else {
                item.href += '&';
            }
            item.href += utmParamQueryString;
            //}
        });
    }

    function docReady(fn) {
        // see if DOM is already available
        if (document.readyState === "complete" || document.readyState === "interactive") {
            // call on next available tick
            setTimeout(fn, 1);
        } else {
            document.addEventListener("DOMContentLoaded", fn);
        }
    }

    docReady(initialize);

    // Append to global 'on document change' callstack
    if (typeof(window._onDocumentChangeListeners) === 'undefined') {
        window._onDocumentChangeListeners = [];
    }
    window._onDocumentChangeListeners.push(injectUtmParamsInLinks);
    /*
    setInterval(function() {
        injectUtmParamsInLinks();
    }, 1000);*/

})();