var CaretakerMessage = function() {
        //Variables

        //Date to Start displaying caretaker message
        var startDate = null;
        //Date to stop displaying caretaker message
        var endDate = null;

        //location of json message
        //https://caretaker-vic-gov.s3-ap-southeast-2.amazonaws.com/message.json
        var messageFile = 'https://drwgdblqzrfiz.cloudfront.net/message.json';
        //location of css file
        //https://caretaker-vic-gov.s3-ap-southeast-2.amazonaws.com/message.css
        var caretakerCSS = 'https://drwgdblqzrfiz.cloudfront.net/message.css';

        //External link timer in seconds
        var linkTimer = 5;
        var jsonData = null;
        var currentDate = new Date();
        var visited = loadStoredData('visited');
        var messageType = (typeof ctMessageType !== 'undefined' ?
            ctMessageType :
            'default');

        /**
         * Create message box
         *
         * @param data Data supplied from json file
         * @param contentField field to use for content within json
         * @param boxClass class to be added to caretaker box
         * @return messageBox
         */
        function createBox(contentName, boxClass) {
            data = jsonData.default;
            if (typeof jsonData[messageType] !== 'undefined') {
                data = jsonData[messageType];
            }

            removeElement('ct_box');
            var messageBox = document.createElement('div');
            messageBox.id = 'ct_box';
            messageBox.className = 'boxClass';

            if (data.image) {
                var messageImgWrapper = document.createElement('div');
                messageImgWrapper.className = 'ct_image';
                var messageImg = document.createElement('img');
                messageImg.src = data.image;
                messageImg.alt = (data.imageAlt ? data.imageAlt : '');

                messageImgWrapper.appendChild(messageImg);
                messageBox.appendChild(messageImgWrapper);
            }

            var messageBoxCloseButton = document.createElement('a');
            messageBoxCloseButton.href = '#';
            messageBoxCloseButton.className = 'ct_close';
            messageBoxCloseButton.id = 'ct_close';
            messageBoxCloseButton.textContent = 'Close';
            messageBoxCloseButton.rel = 'noopener noreferrer';
            messageBoxCloseButton.title = 'Close the Victorian caretaker notification message. This will store your preference to close the message for this browser session.';

            var messageBoxClose = document.createElement('div');
            messageBoxClose.className = 'ct_close_box';
            messageBoxClose.role = 'button';
            messageBoxClose.tabIndex = 0;
            messageBoxClose.addEventListener('click', function() {
                removeElement('ct_box');
                document.body.style.paddingTop = 0;
                storeData('visited', true);
            });
            messageBoxClose.appendChild(messageBoxCloseButton);

            var messageBoxContentWrapper = document.createElement('div');
            messageBoxContentWrapper.className = 'ct_body';
            messageBoxContentWrapper.innerHTML = data[contentName];

            messageBox.appendChild(messageBoxContentWrapper);
            messageBox.appendChild(messageBoxClose);
            document.body.appendChild(messageBox);

            document.body.style.paddingTop = messageBox.clientHeight + 'px';
            messageBoxCloseButton.focus();

            return messageBox;
        }

        /**
         * Load Caretaker Message
         * Grabs json file and passes to function to create message box
         */
        function loadCaretakerMessage() {
            if (visited === false || visited === 'false') {
                createBox('content', 'ct_box_middle');
                window.scrollTo(0,0);
            }
        }

        function loadJSON(sucessCallback, errorCallback) {
            var xhr = new XMLHttpRequest();
            xhr.onreadystatechange = function() {
                if (xhr.readyState === XMLHttpRequest.DONE) {
                    if (xhr.status === 200) {
                        jsonData = JSON.parse(xhr.responseText);
                        startDate = new Date(Date.parse(jsonData.startDate));
                        endDate = new Date(Date.parse(jsonData.endDate));

                        sucessCallback();
                    }
                    else {
                        errorCallback();
                    }
                }
            };
            xhr.open('GET', messageFile, true);
            xhr.send();
        }

        /**
         * Load Caretaker Link Message
         * Loops over all links on a page and adds a popup to external links
         * Optional class can be applied to links to skip popup message
         */
        function loadCaretakerLinkMessage() {
            var data = jsonData.default;
            if (typeof jsonData[messageType] !== 'undefined') {
                data = jsonData[messageType];
            }
            var links = document.getElementsByTagName('a');
            for (var i = 0; i < links.length; i++) {
                var link = links[i];
                if (link.hostname && link.hostname !== location.hostname &&
                    link.hostname.indexOf('vic.gov.au') < 0) {

                    // Update Title Links
                    if (link.title === null || link.title === '') {
                        link.title = link.href;
                    }

                    link.title = link.title + ' | ' + data.linkContent;

                    var showCareLinkMessage = function(e) {
                        e.preventDefault();
                        var messageBox = createBox('linkContent', 'ct_box_middle');
                        var bodyText = document.getElementsByClassName('ct_body');
                        bodyText[0].innerHTML = bodyText[0].innerHTML + "<br />You will be redirected in " + linkTimer + " seconds&hellip;";

                        setTimeout(function() {
                            e.target.click();
                        }, linkTimer * 1000);

                        e.target.removeEventListener(e.type, arguments.callee);
                    };

                    // Add Click Event
                    link.addEventListener('click', showCareLinkMessage, false);
                }
            }
        }

        function getUrlVars() {
            var vars = {};
            var parts = window.location.href.replace(/[?&]+([^=&]+)=([^&]*)/gi,
                function(m, key, value) {
                    vars[key] = value;
                });
            return vars;
        }

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

        function setCookie(cname, cvalue, exdays) {
            var d = new Date();
            d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
            var expires = 'expires=' + d.toUTCString();
            document.cookie = cname + '=' + cvalue + ';' + expires + ';path=/';
        }

        function storeData(type, obj) {
            var data = obj;

            try {

                if (typeof sessionStorage !== undefined &&
                    sessionStorage !== null) {
                    sessionStorage[type] = data;
                }
                else {
                    //jQuery.cookie(type, data, {expires: 1, path: '/'});
                    setCookie(type, data, 365);
                }
            }
            catch (err) { ; }
        }

        function loadStoredData(type) {
            var data;
            if (typeof sessionStorage !== undefined &&
                sessionStorage !== null) {
                data = sessionStorage[type];
            }
            else {
                data = getCookie(type);
            }
            if (data && data.length > 0) {
                return data;
            }
            return false;
        }

        function removeElement(elementId) {
            // Removes an element from the document
            var element = document.getElementById(elementId);
            if (element !== null) {
                element.parentNode.removeChild(element);
            }
        }

        function loadStyleSheet() {
            var fileRef = document.createElement('link');
            fileRef.setAttribute('rel', 'stylesheet');
            fileRef.setAttribute('type', 'text/css');
            fileRef.setAttribute('href', caretakerCSS);

            document.getElementsByTagName('head')[0].appendChild(fileRef);
        }

        this.init = function() {
            loadJSON(function() {
                if ((currentDate.getTime() < startDate.getTime() ||
                        currentDate.getTime() > endDate.getTime())) {
                    return false;
                }

                loadStyleSheet();
                loadCaretakerMessage();
                loadCaretakerLinkMessage();
            }, function() {
            });
        }();
    }
;

function ready(callback) {
    // in case the document is already rendered
    if (document.readyState != 'loading') {
        callback();
    }// modern browsers
    else if (document.addEventListener) {
        document.addEventListener(
            'DOMContentLoaded', callback);
    }// IE <= 8
    else {
        document.attachEvent('onreadystatechange', function() {
            if (document.readyState == 'complete') {
                callback();
            }
        });
    }
}

function initCaretakerScript() {
    ready(function() {
        CaretakerMessage();
    });
}

function loadjQuery(url, success) {
    var script = document.createElement('script');
    script.src = url;
    var head = document.getElementsByTagName('head')[0],
        done = false;
    head.appendChild(script);
    // Attach handlers for all browsers
    script.onload = script.onreadystatechange = function() {
        if (!done && (!this.readyState || this.readyState == 'loaded' ||
                this.readyState == 'complete')) {
            done = true;
            success();
            script.onload = script.onreadystatechange = null;
            head.removeChild(script);
        }
    };
}

initCaretakerScript();