var trackMultitouch = function(trackerType, domain, path, trackerName) {
    // ------------------------------------------------------------------------

    this.conversion = function() {
        var d = domain || ('.' + (/(www.)?([^\/]+)/.exec(document.location.hostname)[2]));
        var p = path || '/';
        if (!getCookie('__mtvis')){
            trackSession(function() {
                trackGAEvent(trackerName, trackerType, getCookie('__mtvis'));
                deleteCookie('__mtvis', p, d);
            });
        }
        else {
            trackGAEvent(trackerName, trackerType, getCookie('__mtvis'));
            deleteCookie('__mtvis', p, d);
        }
    };

    // ------------------------------------------------------------------------
    var getCurrentSourceMedium = function(callback) {
        var utmz = getCookie('__utmz'); //__utmz – переменная содержит информацию о переходе на сайт (реферер, реклама, ввод в адресной строке). Время жизни - 6 месяцев
        if (_gaq instanceof Array) { // если массив _gaq принадлежит классу Array
            setTimeout(arguments.callee(callback), 4000); // arguments.callee(callback) возвращает callback выполняется через 4 секунды
        }

        var medium, source, m_changed, s_changed;

        m_changed = false;
        s_changed = false;

        if (/utmgclid/.exec(utmz)) {
            return callback("adw");
        }
        else {
            try {
                medium = /utmcmd=\(?([^\|;]+)\)?/.exec(utmz)[1];
                source = /utmcsr=\(?([^\|;\)]+)/.exec(utmz)[1];
            }
            catch (err) {
                medium = 'error';
                source = 'error';
            }
        }

        if (source.indexOf("fashion") !== -1) {
            source = source.replace(/fashion/g, "f-");
            s_changed = true;
        }
        else if (source.indexOf("yandex_") !== -1){
            source = source.replace(/yandex_/g, "y-");
            s_changed = true;
        }
        else if (source.indexOf("yandex") !== -1){
            source = source.replace(/yandex/g, "y-");
            s_changed = true;
        }
        else if (source.indexOf("rambler") !== -1){
            source = source.replace(/rambler/g, "r-");
            s_changed = true;
        }
        else if (source.indexOf("vkont_") !== -1){
            source = source.replace(/vkont_/g, "vk-");
            s_changed = true;
        }
        else if (source.indexOf("rasprodaga") !== -1){
            source = source.replace(/rasprodaga/g, "rp-");
            s_changed = true;
        }
        else if (source.indexOf("gnezdo") !== -1){
            source = source.replace(/gnezdo/g, "gn-");
            s_changed = true;
        }
        else if (source.indexOf("shopping") !== -1){
            source = source.replace(/shopping/g, "s-");
            s_changed = true;
        }
        else if (source.indexOf("widget") !== -1){
            source = source.replace(/widget/g, "w-");
            s_changed = true;
        }
        else if (source.indexOf("mamba_") !== -1){
            source = source.replace(/mamba_/g, "m-");
            s_changed = true;
        }


        if (medium.indexOf("partner") !== -1) {
            medium = medium.replace(/partner_/g, "p-");
            m_changed = true;
        }
        else if (medium.indexOf("vkont_") !== -1) {
            medium = medium.replace(/vkont_/g, "vk-");
            m_changed = true;
        }


        return callback( (s_changed ? source : source.slice(0, 5)).replace(/_/g, "-") + '/' + (m_changed ? medium : medium.slice(0, 5)).replace(/_/g, "-") );


        /*
         switch(medium) {
         case "organic":
         return  callback(source.slice(0,2) + "/org");
         case "referral":
         return callback("ref");
         case "(none)":
         return callback("drct");
         case "error":
         return callback("err");
         case '':
         return callback("err");
         case "yandex_cpc":
         return callback("ynd");
         case "begun_cpc":
         return callback("beg");
         case "vk_cpc":
         return callback("vk");
         case "partner":
         return callback("vk");
         default:
         return callback(source.slice(0,3) + '/' + medium.slice(0,3));
         }
         */
    };

    var updateMTCookie = function(value, path, domain) {
        var mtvis = getCookie('__mtvis');
        var res;

        if (!mtvis) {
            res = value;
        }

        else {
            var current_value = mtvis.split("_");
            var last_value = parseInt(current_value[current_value.length - 1], 10) ? { val : current_value[current_value.length - 2], isNumber : true } :
                { val : current_value[current_value.length - 1], isNumber : false };

            if (last_value.val === value) {
                if (last_value.isNumber) {
                    current_value[current_value.length - 1] = parseInt(current_value[current_value.length - 1], 10) + 1;
                }
                else {
                    current_value.push('2');
                }
            }
            else {
                current_value.push(value);
            }

            res = current_value.join("_");
        }

        var date = new Date();
        date.setDate(date.getDate() + 30);
        setCookie('__mtvis', res, date.getFullYear(), date.getMonth(), date.getDate(), path, domain, '');
    };

    var trackSession = function(callback) {
        var p = path || '/';
        var d = domain || ('.' + (/(www.)?([^\/]+)/.exec(document.location.hostname)[2]));

        getCurrentSourceMedium(function(value) {
            updateMTCookie(value, p, d);
            setCookie('__mtsess', 1, '', '', '', p, d, '');
            if (callback instanceof Function) {
                callback();
            }
        });
    };

    var trackGAEvent = function(trackerName, trackerType, value) {
        if (trackerType === 'async') {
            var trackerFunction = trackerName ? trackerName + '._trackEvent' : '_trackEvent';
            _gaq.push([trackerFunction, 'Mtouch', value]);
        }
        else if (trackerType === 'sync') {
            trackerName._trackEvent('Mtouch', value);
        }
    };


    // ------------------------------------------------------------------------
    var getCookie = function(cookie_name) {
        try {
            var results = document.cookie.match ('(^|;) ?' + cookie_name + '=([^;]*)(;|$)');

            if (results) {
                return (unescape(results[2]));
            }
            else {
                return null;
            }
        } catch(e) {}
    };

    var setCookie = function(name, value, exp_y, exp_m, exp_d, path, domain, secure) {
        var cookie_string = name + "=" + escape (value);

        if (exp_y) {
            var expires = new Date (exp_y, exp_m, exp_d);
            cookie_string += "; expires=" + expires.toGMTString();
        }
        if (path) {
            cookie_string += "; path=" + escape (path);
        }

        if (domain) {
            cookie_string += "; domain=" + escape (domain);
        }

        if (secure) {
            cookie_string += "; secure";
        }

        document.cookie = cookie_string;
    };

    var deleteCookie = function(name, path, domain) {
        if (document.cookie.match(name)) {
            document.cookie = name + "=" + ((path) ? ";path=" + path : "") + ((domain) ? ";domain=" + domain : "") +
                ";expires=Thu, 01-Jan-1970 00:00:01 GMT";
        }
    };

    // ------------------------------------------------------------------------

    if (getCookie('__mtsess')) {
        return;
    }

    else {
        trackSession();
    }
};