galboxOptions = Object.extend({
fileLoadingImage:        'images/loading.gif',
fileBottomNavCloseImage: 'images/closelabel.gif',
overlayOpacity: 0.8,
animate: true,
resizeSpeed: 7,
borderSize: 10,
labelImage: "Image",
labelOf: "of"
}, window.galboxOptions || {});

var galbox = Class.create();

galbox.prototype = {
imageArray: [],
activeImage: undefined,

initialize: function() {

this.updateImageList();

this.keyboardAction = this.keyboardAction.bindAsEventListener(this);

if (galboxOptions.resizeSpeed > 10) galboxOptions.resizeSpeed = 10;
if (galboxOptions.resizeSpeed < 1)  galboxOptions.resizeSpeed = 1;

this.resizeDuration = galboxOptions.animate ? ((11 - galboxOptions.resizeSpeed) * 0.15) : 0;
this.overlayDuration = galboxOptions.animate ? 0.2 : 0;

var size = (galboxOptions.animate ? 250 : 1) + 'px';

var objBody = $$('body')[0];

objBody.appendChild(Builder.node('div',{id:'overlay'}));

objBody.appendChild(Builder.node('div',{id:'galbox'}, [
Builder.node('div',{id:'outerImageContainer'},
Builder.node('div',{id:'imageContainer'}, [
Builder.node('img',{id:'galboxImage'}),
Builder.node('div',{id:'hoverNav'}, [
Builder.node('a',{id:'prevLink', href: '#' }),
Builder.node('a',{id:'nextLink', href: '#' })
]),
Builder.node('div',{id:'loading'},
Builder.node('a',{id:'loadingLink', href: '#' },
Builder.node('img', {src: galboxOptions.fileLoadingImage})
)
)
])
),
Builder.node('div', {id:'imageDataContainer'},
Builder.node('div',{id:'imageData'}, [
Builder.node('div',{id:'imageDetails'}, [
Builder.node('span',{id:'caption'}),
Builder.node('span',{id:'numberDisplay'})
]),
Builder.node('div',{id:'bottomNav'},
Builder.node('a',{id:'bottomNavClose', href: '#' },
Builder.node('img', { src: galboxOptions.fileBottomNavCloseImage })
)
)
])
)
]));


$('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
$('galbox').hide().observe('click', (function(event) { if (event.element().id == 'galbox') this.end(); }).bind(this));
$('outerImageContainer').setStyle({ width: size, height: size });
$('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
$('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
$('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
$('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));

var th = this;
(function(){
var ids =
'overlay galbox outerImageContainer imageContainer galboxImage hoverNav prevLink nextLink loading loadingLink ' +
'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';
$w(ids).each(function(id){ th[id] = $(id); });
}).defer();
},

updateImageList: function() {
this.updateImageList = Prototype.emptyFunction;

document.observe('click', (function(event){
var target = event.findElement('a[rel^=galbox]') || event.findElement('area[rel^=galbox]');
if (target) {
event.stop();
this.start(target);
}
}).bind(this));
},

start: function(imageLink) {

$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });

var arrayPageSize = this.getPageSize();
$('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });

new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: galboxOptions.overlayOpacity });

this.imageArray = [];
var imageNum = 0;

if ((imageLink.rel == 'galbox')){
this.imageArray.push([imageLink.href, imageLink.title]);
} else {
this.imageArray =
$$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').
collect(function(anchor){ return [anchor.href, anchor.title]; }).
uniq();

while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; }
}

var arrayPageScroll = document.viewport.getScrollOffsets();
var galboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
var galboxLeft = arrayPageScroll[0];
this.galbox.setStyle({ top: galboxTop + 'px', left: galboxLeft + 'px' }).show();

this.changeImage(imageNum);
},

changeImage: function(imageNum) {

this.activeImage = imageNum;

if (galboxOptions.animate) this.loading.show();
this.galboxImage.hide();
this.hoverNav.hide();
this.prevLink.hide();
this.nextLink.hide();
this.imageDataContainer.setStyle({opacity: .0001});
this.numberDisplay.hide();

var imgPreloader = new Image();

imgPreloader.onload = (function(){
this.galboxImage.src = this.imageArray[this.activeImage][0];
this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
}).bind(this);
imgPreloader.src = this.imageArray[this.activeImage][0];
},

resizeImageContainer: function(imgWidth, imgHeight) {

var widthCurrent  = this.outerImageContainer.getWidth();
var heightCurrent = this.outerImageContainer.getHeight();

var widthNew  = (imgWidth  + galboxOptions.borderSize * 2);
var heightNew = (imgHeight + galboxOptions.borderSize * 2);

var xScale = (widthNew  / widthCurrent)  * 100;
var yScale = (heightNew / heightCurrent) * 100;

var wDiff = widthCurrent - widthNew;
var hDiff = heightCurrent - heightNew;

if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'});
if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration});

var timeout = 0;
if ((hDiff == 0) && (wDiff == 0)){
timeout = 100;
if (Prototype.Browser.IE) timeout = 250;
}

(function(){
this.prevLink.setStyle({ height: imgHeight + 'px' });
this.nextLink.setStyle({ height: imgHeight + 'px' });
this.imageDataContainer.setStyle({ width: widthNew + 'px' });

this.showImage();
}).bind(this).delay(timeout / 1000);
},

showImage: function(){
this.loading.hide();
new Effect.Appear(this.galboxImage, {
duration: this.resizeDuration,
queue: 'end',
afterFinish: (function(){ this.updateDetails(); }).bind(this)
});
this.preloadNeighborImages();
},

updateDetails: function() {

if (this.imageArray[this.activeImage][1] != ""){
this.caption.update(this.imageArray[this.activeImage][1]).show();
}

if (this.imageArray.length > 1){
this.numberDisplay.update( galboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + galboxOptions.labelOf + '  ' + this.imageArray.length).show();
}

new Effect.Parallel(
[
new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }),
new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration })
],
{
duration: this.resizeDuration,
afterFinish: (function() {
var arrayPageSize = this.getPageSize();
this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
this.updateNav();
}).bind(this)
}
);
},

updateNav: function() {

this.hoverNav.show();

if (this.activeImage > 0) this.prevLink.show();

if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();

this.enableKeyboardNav();
},

enableKeyboardNav: function() {
document.observe('keydown', this.keyboardAction);
},

disableKeyboardNav: function() {
document.stopObserving('keydown', this.keyboardAction);
},

keyboardAction: function(event) {
var keycode = event.keyCode;

var escapeKey;
if (event.DOM_VK_ESCAPE) {
escapeKey = event.DOM_VK_ESCAPE;
} else {
escapeKey = 27;
}

var key = String.fromCharCode(keycode).toLowerCase();

if (key.match(/x|o|c/) || (keycode == escapeKey)){
this.end();
} else if ((key == 'p') || (keycode == 37)){
if (this.activeImage != 0){
this.disableKeyboardNav();
this.changeImage(this.activeImage - 1);
}
} else if ((key == 'n') || (keycode == 39)){
if (this.activeImage != (this.imageArray.length - 1)){
this.disableKeyboardNav();
this.changeImage(this.activeImage + 1);
}
}
},

preloadNeighborImages: function(){
var preloadNextImage, preloadPrevImage;
if (this.imageArray.length > this.activeImage + 1){
preloadNextImage = new Image();
preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
}
if (this.activeImage > 0){
preloadPrevImage = new Image();
preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
}

},

end: function() {
this.disableKeyboardNav();
this.galbox.hide();
new Effect.Fade(this.overlay, { duration: this.overlayDuration });
$$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
},

getPageSize: function() {

var xScroll, yScroll;

if (window.innerHeight && window.scrollMaxY) {
xScroll = window.innerWidth + window.scrollMaxX;
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) {
if(document.documentElement.clientWidth){
windowWidth = document.documentElement.clientWidth;
} else {
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 = xScroll;
} else {
pageWidth = windowWidth;
}

return [pageWidth,pageHeight];
}
}

document.observe('dom:loaded', function () { new galbox(); });