/*
	Authors:
	Christophe Beyls ([url=http://www.digitalia.be]http://www.digitalia.be[/url]); MIT-style license.
	Inspired by the original Lightbox v2 by Lokesh Dhakar.
	Refactored by Aaron Newton <aaron [dot] newton [at] cnet [dot] com>
	Modified by Chris Martin <chris [dot] martin [at] redantdesign [dot] com>
*/
var Lightbox = new Class({
	options: {
		resizeDuration: 400,
		resizeTransition: false,	// default transition
		initialWidth: 250,
		initialHeight: 250,
		animateCaption: true,
		showCounter: true,
		autoScanLinks: true,
		relString: 'lightbox',
		useDefaultCss: true,
		assetBaseUrl: '/_css/',
		onImageShow: Class.empty,
		onDisplay: Class.empty,
		onHide: Class.empty 
	},
 
	initialize: function(options, anchors){
		this.setOptions(options);
		if(this.options.useDefaultCss) this.addCss();
		this.anchors = anchors || [];
		if (this.options.autoScanLinks) {
			$each(document.links, function(el){
				if (el.rel && el.rel.test("^"+this.options.relString,'i')){
					this.anchors.push(el);
				}
			}, this);
		}
		$$(this.anchors).each(function(el){
			if(!el.getProperty('rel')) el.setProperty('rel', this.options.relString);
			el.addEvent('click', function(e){
				new Event(e).stop();
				this.click(el);
			}.bind(this));
		}.bind(this));
		this.eventKeyDown = this.keyboardListener.bindAsEventListener(this);
		this.eventPosition = this.position.bind(this);
		window.addEvent('domready', this.addHtmlElements.bind(this));
	},
 
	addHtmlElements: function(){
		if($("lbOverlay")) {
			$("lbOverlay").remove();
			$("lbCenter").remove();
			$("lbBottomContainer").remove();
		}
		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.addEvent('click', this.previous.bindWithEvent(this));
		this.nextLink.addEvent('click', this.next.bindWithEvent(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();
	},
 
	addCss: function(){
		if(!$('SlimboxCss')) window.addEvent('domready', function(){
			new Asset.css(this.options.assetBaseUrl + 'slimbox.css', {id: 'SlimboxCss'});
		}.bind(this));
	},
 
	click: function(link){
		if (link.rel == this.options.relString) 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.fireEvent('onDisplay');
		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(e){
		new Event(e).stop();
		return this.changeImage(this.activeImage-1);
	},
 
	next: function(e){
		new Event(e).stop();
		return this.changeImage(this.activeImage+1);
	},
 
	changeImage: function(imageNum){
		this.fireEvent('onImageShow', imageNum);
		if (this.step || (imageNum < 0) || (imageNum >= this.images.length)) return false;
		this.step = 1;
		this.activeImage = imageNum;
 
		this.center.style.backgroundColor = '#000';
		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:
			this.center.style.backgroundColor = '#000';
			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(){
		this.fireEvent('onHide');
		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;
	}
});
Lightbox.implement(new Options);
Lightbox.implement(new Events);