/*
	Slimbox v1.41 - The ultimate lightweight Lightbox clone
	by Christophe Beyls (http://www.digitalia.be) - MIT-style license.
	Inspired by the original Lightbox v2 by Lokesh Dhakar.
*/

if (window.MooTools) {
	var Lightbox = {

		init: function(options){
			this.options = $extend({
				resizeDuration: 400,
				resizeTransition: false,	// default transition
				initialWidth: 250,
				initialHeight: 250,
				animateCaption: true,
				showCounter: true
			}, options || {});

			this.anchors = [];
			$each(document.links, function(el){
				if (el.rel && el.rel.test(/^lightbox/i)){
					el.onclick = this.click.pass(el, this);
					this.anchors.push(el);
				}
			}, this);
			this.eventKeyDown = this.keyboardListener.bindAsEventListener(this);
			this.eventPosition = this.position.bind(this);

			this.overlay = new Element('div', {'id': 'lbOverlay'}).injectInside(document.body);

			this.center = new Element('div', {'id': 'lbCenter', 'styles': {'width': this.options.initialWidth, 'height': this.options.initialHeight, 'marginLeft': -(this.options.initialWidth/2), 'display': 'none'}}).injectInside(document.body);
			this.image = new Element('div', {'id': 'lbImage'}).injectInside(this.center);
			this.prevLink = new Element('a', {'id': 'lbPrevLink', 'href': '#', 'styles': {'display': 'none'}}).injectInside(this.image);
			this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.image);
			this.prevLink.onclick = this.previous.bind(this);
			this.nextLink.onclick = this.next.bind(this);

			this.bottomContainer = new Element('div', {'id': 'lbBottomContainer', 'styles': {'display': 'none'}}).injectInside(document.body);
			this.bottom = new Element('div', {'id': 'lbBottom'}).injectInside(this.bottomContainer);
			new Element('a', {'id': 'lbCloseLink', 'href': '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
			this.caption = new Element('div', {'id': 'lbCaption'}).injectInside(this.bottom);
			this.number = new Element('div', {'id': 'lbNumber'}).injectInside(this.bottom);
			new Element('div', {'styles': {'clear': 'both'}}).injectInside(this.bottom);

			var nextEffect = this.nextEffect.bind(this);
			this.fx = {
				overlay: this.overlay.effect('opacity', {duration: 500}).hide(),
				resize: this.center.effects($extend({duration: this.options.resizeDuration, onComplete: nextEffect}, this.options.resizeTransition ? {transition: this.options.resizeTransition} : {})),
				image: this.image.effect('opacity', {duration: 500, onComplete: nextEffect}),
				bottom: this.bottom.effect('margin-top', {duration: 400, onComplete: nextEffect})
			};

			this.preloadPrev = new Image();
			this.preloadNext = new Image();
		},

		click: function(link){
			if (link.rel.length == 8) return this.show(link.href, link.title);

			var j, imageNum, images = [];
			this.anchors.each(function(el){
				if (el.rel == link.rel){
					for (j = 0; j < images.length; j++) if(images[j][0] == el.href) break;
					if (j == images.length){
						images.push([el.href, el.title]);
						if (el.href == link.href) imageNum = j;
					}
				}
			}, this);
			return this.open(images, imageNum);
		},

		show: function(url, title){
			return this.open([[url, title]], 0);
		},

		open: function(images, imageNum){
			this.images = images;
			this.position();
			this.setup(true);
			this.top = window.getScrollTop() + (window.getHeight() / 15);
			this.center.setStyles({top: this.top, display: ''});
			this.fx.overlay.start(0.8);
			return this.changeImage(imageNum);
		},

		position: function(){
			this.overlay.setStyles({'top': window.getScrollTop(), 'height': window.getHeight()});
		},

		setup: function(open){
			var elements = $A(document.getElementsByTagName('object'));
			elements.extend(document.getElementsByTagName(window.ie ? 'select' : 'embed'));
			elements.each(function(el){
				if (open) el.lbBackupStyle = el.style.visibility;
				el.style.visibility = open ? 'hidden' : el.lbBackupStyle;
			});
			var fn = open ? 'addEvent' : 'removeEvent';
			window[fn]('scroll', this.eventPosition)[fn]('resize', this.eventPosition);
			document[fn]('keydown', this.eventKeyDown);
			this.step = 0;
		},

		keyboardListener: function(event){
			switch (event.keyCode){
				case 27: case 88: case 67: this.close(); break;
				case 37: case 80: this.previous(); break;	
				case 39: case 78: this.next();
			}
		},

		previous: function(){
			return this.changeImage(this.activeImage-1);
		},

		next: function(){
			return this.changeImage(this.activeImage+1);
		},

		changeImage: function(imageNum){
			if (this.step || (imageNum < 0) || (imageNum >= this.images.length)) return false;
			this.step = 1;
			this.activeImage = imageNum;

			this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
			this.fx.image.hide();
			this.center.className = 'lbLoading';

			this.preload = new Image();
			this.preload.onload = this.nextEffect.bind(this);
			this.preload.src = this.images[imageNum][0];
			return false;
		},

		nextEffect: function(){
			switch (this.step++){
			case 1:
				this.center.className = '';
				this.image.style.backgroundImage = 'url('+this.images[this.activeImage][0]+')';
				this.image.style.width = this.bottom.style.width = this.preload.width+'px';
				this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'px';

				this.caption.setHTML(this.images[this.activeImage][1] || '');
				this.number.setHTML((!this.options.showCounter || (this.images.length == 1)) ? '' : 'Image '+(this.activeImage+1)+' of '+this.images.length);

				if (this.activeImage) this.preloadPrev.src = this.images[this.activeImage-1][0];
				if (this.activeImage != (this.images.length - 1)) this.preloadNext.src = this.images[this.activeImage+1][0];
				if (this.center.clientHeight != this.image.offsetHeight){
					this.fx.resize.start({height: this.image.offsetHeight});
					break;
				}
				this.step++;
			case 2:
				if (this.center.clientWidth != this.image.offsetWidth){
					this.fx.resize.start({width: this.image.offsetWidth, marginLeft: -this.image.offsetWidth/2});
					break;
				}
				this.step++;
			case 3:
				this.bottomContainer.setStyles({top: this.top + this.center.clientHeight, height: 0, marginLeft: this.center.style.marginLeft, display: ''});
				this.fx.image.start(1);
				break;
			case 4:
				if (this.options.animateCaption){
					this.fx.bottom.set(-this.bottom.offsetHeight);
					this.bottomContainer.style.height = '';
					this.fx.bottom.start(0);
					break;
				}
				this.bottomContainer.style.height = '';
			case 5:
				if (this.activeImage) this.prevLink.style.display = '';
				if (this.activeImage != (this.images.length - 1)) this.nextLink.style.display = '';
				this.step = 0;
			}
		},

		close: function(){
			if (this.step < 0) return;
			this.step = -1;
			if (this.preload){
				this.preload.onload = Class.empty;
				this.preload = null;
			}
			for (var f in this.fx) this.fx[f].stop();
			this.center.style.display = this.bottomContainer.style.display = 'none';
			this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
			return false;
		}
	};

	if (window.Asset) {
		new Asset.css('/css/slimbox.css', {'media': 'all'});
	} else {
		document.write('<link rel="stylesheet" media="all" type="text/css" href="/css/slimbox.css" />');
	}
	window.addEvent('domready', Lightbox.init.bind(Lightbox));
}