var loadingImage = '/assets/images/loading.gif';
var closeButton = '/assets/images/close.gif';

function getPageScroll() {
    var yScroll;
    if (self.pageYOffset) {
        yScroll = self.pageYOffset
    } else if (document.documentElement && document.documentElement.scrollTop) {
        yScroll = document.documentElement.scrollTop
    } else if (document.body) {
        yScroll = document.body.scrollTop
    }
    arrayPageScroll = new Array('', yScroll);
    return arrayPageScroll;
}
function getPageSize() {
    var xScroll, yScroll;
    if (window.innerHeight && window.scrollMaxY) {
        xScroll = document.body.scrollWidth;
        yScroll = window.innerHeight + window.scrollMaxY
    } else if (document.body.scrollHeight > document.body.offsetHeight) {
        xScroll = document.body.scrollWidth;
        yScroll = document.body.scrollHeight
    } else {
        xScroll = document.body.offsetWidth;
        yScroll = document.body.offsetHeight
    }
    var windowWidth, windowHeight;
    if (self.innerHeight) {
        windowWidth = self.innerWidth;
        windowHeight = self.innerHeight
    } else if (document.documentElement && document.documentElement.clientHeight) {
        windowWidth = document.documentElement.clientWidth;
        windowHeight = document.documentElement.clientHeight
    } else if (document.body) {
        windowWidth = document.body.clientWidth;
        windowHeight = document.body.clientHeight
    }
    if (yScroll < windowHeight) {
        pageHeight = windowHeight
    } else {
        pageHeight = yScroll
    }
    if (xScroll < windowWidth) {
        pageWidth = windowWidth
    } else {
        pageWidth = xScroll
    }
    arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight);
    return arrayPageSize;
}
function pause(numberMillis) {
    var now = new Date();
    var exitTime = now.getTime() + numberMillis;
    while (true) {
        now = new Date();
        if (now.getTime() > exitTime) return
    }
}
function getKey(e) {
    if (e == null) {
        keycode = event.keyCode
    } else {
        keycode = e.which
    }
    key = String.fromCharCode(keycode).toLowerCase();
    if (key == 'x') {
        hideLightbox()
    }
}
function listenKey() {
    document.onkeypress = getKey
}
function showLightbox(objLink) {
    var objOverlay = document.getElementById('overlay');
    var objLightbox = document.getElementById('lightbox');
    var objCaption = document.getElementById('lightboxCaption');
    var objImage = document.getElementById('lightboxImage');
    var objLoadingImage = document.getElementById('loadingImage');
    var objLightboxDetails = document.getElementById('lightboxDetails');
    var arrayPageSize = getPageSize();
    var arrayPageScroll = getPageScroll();
    if (objLoadingImage) {
        objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
        objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
        objLoadingImage.style.display = 'block'
    }
    objOverlay.style.height = (arrayPageSize[1] + 'px');
    objOverlay.style.display = 'block';
    imgPreload = new Image();
    imgPreload.onload = function () {
        objImage.src = objLink.href;
        var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
        var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
        objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
        objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
        objLightboxDetails.style.width = imgPreload.width + 'px';
        if (objLink.getAttribute('title')) {
            objCaption.style.display = 'block';
            objCaption.innerHTML = objLink.getAttribute('title')
        } else {
            objCaption.style.display = 'none'
        }
        if (navigator.appVersion.indexOf("MSIE") != -1) {
            pause(250)
        }
        if (objLoadingImage) {
            objLoadingImage.style.display = 'none'
        }
        selects = document.getElementsByTagName("select");
        for (i = 0; i != selects.length; i++) {
            selects[i].style.visibility = "hidden"
        }
        objLightbox.style.display = 'block';
        arrayPageSize = getPageSize();
        objOverlay.style.height = (arrayPageSize[1] + 'px');
        listenKey();
        return false
    }
    imgPreload.src = objLink.href;
}
function hideLightbox() {
    objOverlay = document.getElementById('overlay');
    objLightbox = document.getElementById('lightbox');
    objOverlay.style.display = 'none';
    objLightbox.style.display = 'none';
    selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
        selects[i].style.visibility = "visible"
    }
    document.onkeypress = '';
}
function initLightbox() {
    if (!document.getElementsByTagName) {
        return
    }
    var anchors = document.getElementsByTagName("a");
    for (var i = 0; i < anchors.length; i++) {
        var anchor = anchors[i];
        if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")) {
            anchor.onclick = function () {
                showLightbox(this);
                return false;
            }
        }
    }
    var objBody = document.getElementsByTagName("body").item(0);
    var objOverlay = document.createElement("div");
    objOverlay.setAttribute('id', 'overlay');
    objOverlay.onclick = function () {
        hideLightbox();
        return false
    }
    objOverlay.style.display = 'none';
    objOverlay.style.position = 'absolute';
    objOverlay.style.top = '0';
    objOverlay.style.left = '0';
    objOverlay.style.zIndex = '90';
    objOverlay.style.width = '100%';
    objBody.insertBefore(objOverlay, objBody.firstChild);
    var arrayPageSize = getPageSize();
    var arrayPageScroll = getPageScroll();
    var imgPreloader = new Image();
    imgPreloader.onload = function () {
        var objLoadingImageLink = document.createElement("a");
        objLoadingImageLink.setAttribute('href', '#');
        objLoadingImageLink.onclick = function () {
            hideLightbox();
            return false;
        }
        objOverlay.appendChild(objLoadingImageLink);
        var objLoadingImage = document.createElement("img");
        objLoadingImage.src = loadingImage;
        objLoadingImage.setAttribute('id', 'loadingImage');
        objLoadingImage.style.position = 'absolute';
        objLoadingImage.style.zIndex = '150';
        objLoadingImageLink.appendChild(objLoadingImage);
        imgPreloader.onload = function () {};
        return false;
    }
    imgPreloader.src = loadingImage;
    var objLightbox = document.createElement("div");
    objLightbox.setAttribute('id', 'lightbox');
    objLightbox.style.display = 'none';
    objLightbox.style.position = 'absolute';
    objLightbox.style.zIndex = '100';
    objBody.insertBefore(objLightbox, objOverlay.nextSibling);
    var objLink = document.createElement("a");
    objLink.setAttribute('href', '#');
    objLink.setAttribute('title', 'Click to close');
    objLink.onclick = function () {
        hideLightbox();
        return false;
    }
    objLightbox.appendChild(objLink);
    var imgPreloadCloseButton = new Image();
    imgPreloadCloseButton.onload = function () {
        var objCloseButton = document.createElement("img");
        objCloseButton.src = closeButton;
        objCloseButton.setAttribute('id', 'closeButton');
        objCloseButton.style.position = 'absolute';
        objCloseButton.style.zIndex = '200';
        objLink.appendChild(objCloseButton);
        return false;
    }
    imgPreloadCloseButton.src = closeButton;
    var objImage = document.createElement("img");
    objImage.setAttribute('id', 'lightboxImage');
    objLink.appendChild(objImage);
    var objLightboxDetails = document.createElement("div");
    objLightboxDetails.setAttribute('id', 'lightboxDetails');
    objLightbox.appendChild(objLightboxDetails);
    var objCaption = document.createElement("div");
    objCaption.setAttribute('id', 'lightboxCaption');
    objCaption.style.display = 'none';
    objLightboxDetails.appendChild(objCaption);
    var objKeyboardMsg = document.createElement("div");
    objKeyboardMsg.setAttribute('id', 'keyboardMsg');
    objKeyboardMsg.innerHTML = 'press <a href="#" onclick="hideLightbox(); return false;"><kbd>x</kbd></a> to close';
    objLightboxDetails.appendChild(objKeyboardMsg);
}
function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func
    } else {
        window.onload = function () {
            oldonload();
            func();
        }
    }
}
addLoadEvent(initLightbox);