/*
	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.
	
	Adapted for bootStrap by Jonathan Puckey - 2008
*/

var Lightbox = {

	init: function(options){
		this.options = Hash.merge({
			resizeDuration: 0,
			resizeTransition: false,	// default transition
			initialWidth: 0,
			initialHeight: 0,
			animateCaption: false,
			showCounter: true
		}, options);

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

		this.overlay = new DomElement('div', {'id': 'lbOverlay'}).insertBottom($("body"));

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

		this.bottomContainer = new DomElement('div', {'id': 'lbBottomContainer', 'styles': {'display': 'none'}}).insertBottom($("body"));
		this.bottom = new DomElement('div', {'id': 'lbBottom'}).insertBottom(this.bottomContainer);
		
		new DomElement('a', {id: 'lbCloseLink', href: '#'}).appendText('Close Image').insertBottom(this.bottom).$.onclick = this.overlay.$.onclick = this.close.bind(this);
		
		this.caption = new DomElement('div', {'id': 'lbCaption'}).insertBottom(this.bottom);
		this.number = new DomElement('div', {'id': 'lbNumber'}).insertBottom(this.bottom);
		new DomElement('div', {'styles': {'clear': 'both'}}).insertBottom(this.bottom);

		var nextEffect = this.nextEffect.bind(this);
		this.fx = {
			overlay: this.overlay.effect('opacity', {duration: 0}).hide(),
			resize: this.center.effects(Hash.merge({duration: this.options.resizeDuration, onComplete: nextEffect}, this.options.resizeTransition ? {transition: this.options.resizeTransition} : {})),
			image: this.image.effect('opacity', {duration: 0, onComplete: nextEffect}),
			bottom: this.bottom.effect('margin-top', {duration: 0, 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.getScrollOffset().y + (Window.getSize().height / 15);
		
		this.center.setStyles({top: this.top, display: ''});
		this.fx.overlay.start(0.4);

		return this.changeImage(imageNum);
	},

	position: function(){
		this.overlay.setStyles({'top': Document.getView().getScrollOffset().y, 'height': Document.getSize().height});
	},

	setup: function(open){
		var elements = $A(document.getElementsByTagName('object'));
		elements.append(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);
		Window.addEvent('scroll', this.eventPosition);
		Window.addEvent('resize', this.eventPosition);
		Window.addEvent('keydown', this.eventKeyDown);
//		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 = null;
			this.preload = null;
		}
		for (var f in this.fx) this.fx[f].stop();
		this.center.$.style.display = this.bottomContainer.$.style.display = 'none';
		this.center.$.style.width = 0;
		this.center.$.style.height = 0;
		this.fx.overlay.chain(this.setup.bind(this, false)).start(0);
		return false;
	}
};

Document.addEvent('domready', Lightbox.init.bind(Lightbox));