function guid() {
    function s4() {
        return Math.floor((1 + Math.random()) * 0x10000).toString(16).substring(1);
    }

    return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4();
}

function getCookie(name) {
    return sessionStorage[name];
}

function createCookie(name, value) {
    sessionStorage[name] = value;
    return value;
}

function getDefaultUrl() {
    return "https://tracker.thinkindot.com/api/event";
}

function getObjectId(object) {
    var event = object.event;
    var objectUrl = event.object_url;
    var objectId = "0";

    if (objectUrl !== undefined) {
        if (object.object_id_regex !== undefined && object.object_id_regex !== null) {
            var regex = new RegExp(object.object_id_regex);
            objectId = regex.exec(objectUrl);
        }

        // fallback
        if (objectId === undefined || objectId === null || objectId === NaN) {
            if (objectUrl.indexOf("?") !== -1) {
                objectUrl = objectUrl.split("?")[0];
            }
            if (objectUrl.indexOf("#") !== -1) {
                objectUrl = objectUrl.split("#")[0];
            }

            if (objectUrl.indexOf("/notas/") !== -1) {
                var urlParts = objectUrl.split("/");
                var titleParts = urlParts[4].split("-");
                objectId = titleParts[0];
            } else {
                var urlParts = objectUrl.split("/");
                var titleParts = urlParts[3].split("-");
                objectId = titleParts[titleParts.length - 1].replace("n", "");
            }
        }
    }
    return objectId + "";
}


function tracker_event(object) {
    if (object.event !== undefined) {
        object.event.session_id = getSession();
        object.event.unique_user_id = getUniqueUserId();
        if (!object.event.object_id) {
            object.event.object_id = getObjectId(object);
        }

        var http = new XMLHttpRequest();
        http.open("POST", object.url, true);
        http.setRequestHeader("Content-type", "application/json");
        http.onreadystatechange = function () {
            //Call a function when the state changes.
            if (http.readyState == 4 && http.status == 200) {
                console.log(http.responseText);
            }
        }
        http.send(JSON.stringify(object.event));
    }
}

function getUserRelatedContent(pObj, callback) {
    var userIdType = "session";
    if (pObj.userId !== undefined) {
        userIdType = "backend";
    }

    var url = getDefaultUrl() + "/" + pObj.organizationId + "/" + pObj.applicationId + "/user/" + pObj.userId + "/content/" + pObj.contentId + "/relatedContent?userIdType=" + userIdType + "&dateFrom=" + pObj.dateFrom + "&dateTo=" + pObj.dateTo;
    url = encodeURI(url);

    var http = new XMLHttpRequest();
    http.open("GET", url, true);
    http.setRequestHeader("Content-type", "application/json");
    http.onreadystatechange = function () {
        //Call a function when the state changes.
        if (http.readyState == 4 && http.status == 200) {
            callback(http.responseText);
        }
    };
    http.send();
}

function getSession() {
    var cookie = getCookie("session");
    if (cookie == undefined) {
        cookie = createCookie("session", guid());
    }
    return cookie;
}

function getUniqueUserId() {
    var uuid = guid();
    if (localStorage !== undefined) {
        if (localStorage['tracker_uid'] === undefined) {
            localStorage['tracker_uid'] = uuid;
        } else {
            uuid = localStorage['tracker_uid'];
        }
    }
    return uuid;
}