var MojoZoom = (function() {

var $ = function(id) {return document.getElementById(id);};
var dc = function(tag) {return document.createElement(tag);};

var defaultWidth = 400;
var defaultHeight = 225;

function addEvent(element, ev, handler) 
{
var doHandler = function(e) {
return handler(e||window.event);
}
if (element.addEventListener) { 
element.addEventListener(ev, doHandler, false); 
} else if (element.attachEvent) { 
element.attachEvent("on" + ev, doHandler); 
}
}

function getElementPos(element)
{
var x = element.offsetLeft;
var y = element.offsetTop;
var parent = element.offsetParent;
while (parent) {
x += parent.offsetLeft;
y += parent.offsetTop;
parent = parent.offsetParent;
}
return {
x : x,
y : y
}
}

function getEventMousePos(element, e) {
var scrollX = document.body.scrollLeft || document.documentElement.scrollLeft;
var scrollY = document.body.scrollTop || document.documentElement.scrollTop;

if (e.currentTarget) {
var pos = getElementPos(element);
return {
x : e.clientX - pos.x + scrollX,
y : e.clientY - pos.y + scrollY
}
}
return {
x : e.offsetX,
y : e.offsetY
}
}

function makeZoomable(img, zoomSrc, zoomImgCtr, zoomWidth, zoomHeight, alwaysShow) {
if (!img.complete && !img.__mojoZoomQueued) {
addEvent(img, "load", function() {
img.__mojoZoomQueued = true;
setTimeout(function() {
makeZoomable(img, zoomSrc, zoomImgCtr, zoomWidth, zoomHeight, alwaysShow);
}, 1);
});
return;
}

img.__mojoZoomQueued = false;

setTimeout(function(){

var isIE = !!document.all && !!window.attachEvent && !window.opera;

var w = img.offsetWidth;
var h = img.offsetHeight;

var oldParent = img.parentNode;
if (oldParent.nodeName != "A") {
var linkParent = dc("a");
linkParent.setAttribute("href", zoomSrc);
oldParent.replaceChild(linkParent, img);
linkParent.appendChild(img);
} else {
var linkParent = oldParent;
}

linkParent.style.position = "relative";
linkParent.style.display = "block";
linkParent.style.width = w+"px";
linkParent.style.height = h+"px";

var imgLeft = img.offsetLeft;
var imgTop = img.offsetTop;

var flypage = document.getElementById("flypage-right");

var zoom = dc("div");
zoom.className = "ngiszoom_marker";

var zoomImg = dc("img");
zoomImg.className = "ngiszoom_img";

zoomImg.style.position = "absolute";
zoomImg.style.left = "-9999px";
zoomImg.style.top = "-9999px";

document.body.appendChild(zoomImg);

var parent = img.parentNode;

var ctr = dc("div");
with (ctr.style) {
position = "absolute";
left = imgLeft+"px";
top = imgTop+"px";
width = w+"px";
height = h+"px";
overflow = "hidden";
display = "none";
}

ctr.appendChild(zoom);
parent.appendChild(ctr);

var zoomInput = parent;

if (img.__mojoZoomOverlay)
parent.removeChild(img.__mojoZoomOverlay);
img.__mojoZoomOverlay = ctr;

if (img.__mojoZoomImage && img.__mojoZoomImage.parentNode)
img.__mojoZoomImage.parentNode.removeChild(img.__mojoZoomImage);
img.__mojoZoomImage = zoomImg;

var useDefaultCtr = false;
if (!zoomImgCtr) {
zoomImgCtr = dc("div");
zoomImgCtr.className = "ngiszoom_imgctr";

var imgPos = getElementPos(img);
zoomImgCtr.style.left = w + imgPos.x + "px";
zoomImgCtr.style.top = imgPos.y + "px";

zoomImgCtr.style.width = (zoomWidth ? zoomWidth : defaultWidth) +"px";
zoomImgCtr.style.height = (zoomHeight ? zoomHeight : defaultHeight) +"px";

document.body.appendChild(zoomImgCtr);
useDefaultCtr = true;
}
zoomImgCtr.style.overflow = "hidden";

if (!alwaysShow) {
zoomImgCtr.style.visibility = "hidden";
}

addEvent(zoomImg, "load", function() {

if (!zoomImg.parentNode) return;

var zoomWidth = zoomImg.offsetWidth;
var zoomHeight = zoomImg.offsetHeight;

var ctrWidth = zoomImgCtr.offsetWidth;
var ctrHeight = zoomImgCtr.offsetHeight;

var ratioW = zoomWidth / w;
var ratioH = zoomHeight / h;

var markerWidth = Math.round(ctrWidth / ratioW);
var markerHeight = Math.round(ctrHeight / ratioH);

document.body.removeChild(zoomImg);
zoomImgCtr.appendChild(zoomImg);

var zoomFill = dc("div");
zoomFill.className = "ngiszoom_fill";
zoom.appendChild(zoomFill);

var zoomBorder = dc("div");
zoomBorder.className = "ngiszoom_border";
zoom.appendChild(zoomBorder);

zoom.style.width = markerWidth+"px";
zoom.style.height = markerHeight+"px";

if (alwaysShow) {
zoom.style.left = "0px";
zoom.style.top = "0px";

zoomImg.style.left = "0px";
zoomImg.style.top = "0px";
}

var isInImage = false;

if (!alwaysShow) {
addEvent(zoomInput, "mouseout", 
function(e) {
var target = e.target || e.srcElement;
if (!target) return;
if (target.nodeName != "DIV") return;
var relTarget = e.relatedTarget || e.toElement;
if (!relTarget) return;
while (relTarget != target && relTarget.nodeName != "BODY" && relTarget.parentNode) {
relTarget = relTarget.parentNode;
}
if (relTarget != target) {
isInImage = false;
ctr.style.display = "none";
zoomImgCtr.style.visibility = "hidden";
flypage.style.visibility = "visible";
}
}
);
addEvent(document.body, "mouseover", 
function(e) {
if (isInImage && !(e.toElement == zoomBorder || e.target == zoomBorder)) {
ctr.style.display = "none";
zoomImgCtr.style.visibility = "hidden";
flypage.style.visibility = "visible";
isInImage = false;
}
}
);
}

addEvent(zoomInput, "mousemove", 
function(e) {
isInImage = true;

var imgPos = getElementPos(img);

if (useDefaultCtr) {
zoomImgCtr.style.left = w + imgPos.x + "px";
zoomImgCtr.style.top = imgPos.y + "px";
}
ctr.style.display = "block";
zoomImgCtr.style.visibility = "visible";
flypage.style.visibility = "hidden";
var pos = getEventMousePos(zoomInput, e);
if (e.srcElement && isIE) {
if (e.srcElement == zoom) return;
if (e.srcElement != zoomInput) {
var zoomImgPos = getElementPos(e.srcElement);
pos.x -= (imgPos.x - zoomImgPos.x);
pos.y -= (imgPos.y - zoomImgPos.y);
}
}
var x = markerWidth/2;
var y = markerHeight/2;

if (!isIE) {
pos.x -= imgLeft;
pos.y -= imgTop;
}

if (pos.x < x) pos.x = x;
if (pos.x > w-x) pos.x = w-x;
if (pos.y < y) pos.y = y;
if (pos.y > h-y) pos.y = h-y;

var left = ((pos.x - x)|0);
var top = ((pos.y - y)|0);

zoom.style.left = left + "px";
zoom.style.top = top + "px";

zoomImg.style.left = -((pos.x*ratioW - ctrWidth/2)|0)+"px";
zoomImg.style.top = -((pos.y*ratioH - ctrHeight/2)|0)+"px";
}
);
});

setTimeout(function() { 
zoomImg.src = zoomSrc;
}, 1);

}, 1);
}

function init() {
var images = document.getElementsByTagName("img");
for (var i=0;i<images.length;i++) {
var img = images[i];
var zoomSrc = img.getAttribute("data-zoomsrc");
if (zoomSrc) {
makeZoomable(img, zoomSrc, document.getElementById(img.getAttribute("id") + "_zoom"), null, null, img.getAttribute("data-zoomalwaysshow")=="true");
}
}
}

return {
addEvent : addEvent,
init : init,
makeZoomable : makeZoomable
};

})();

MojoZoom.addEvent(window, "load", MojoZoom.init);