/*
	Slimbox v1.22 - The ultimate lightweight Lightbox clone
	by Christophe Beyls (http://www.digitalia.be) - MIT-style license.
						 Inspired by the original Lightbox v2 by Lokesh Dhakar.
						 */

var Lightbox = {
	
init: function(options) {
	this.options = Object.extend({
resizeDuration: 400,	// Duration of height and width resizing (ms)
initialWidth: 250,		// Initial width of the box (px)
initialHeight: 250,		// Initial height of the box (px)
animateCaption: true	// Enable/Disable caption animation
	}, options || {});
	
	this.anchors = [];
	$A(document.getElementsByTagName('a')).each(function(el){
		if(el.rel && el.href && 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').setProperty('id', 'lbOverlay').injectInside(document.body);
	
	this.center = new Element('div').setProperty('id', 'lbCenter').setStyles({width: this.options.initialWidth+'px', height: this.options.initialHeight+'px', marginLeft: '-'+(this.options.initialWidth/2)+'px', display: 'none'}).injectInside(document.body);
	this.image = new Element('div').setProperty('id', 'lbImage').injectInside(this.center);
	this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('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.bottom = new Element('div').setProperty('id', 'lbBottom').setStyle('display', 'none').injectInside(document.body);
	new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
	this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
	this.number = new Element('div').setProperty('id', 'lbNumber').injectInside(this.bottom);
	new Element('div').setStyle('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({ duration: this.options.resizeDuration, onComplete: nextEffect }),
image: this.image.effect('opacity', { duration: 500, onComplete: nextEffect }),
bottom: this.bottom.effects({ 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+'px', display: ''});
	this.fx.overlay.goTo(0.8);
	return this.changeImage(imageNum);
},

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

setup: function(open) {
	var elements = $A(document.getElementsByTagName('object'));
	elements.extend(document.getElementsByTagName(window.ActiveXObject ? 'select' : 'embed'));
	elements.each(function(el){ el.style.visibility = open ? 'hidden' : ''; });
	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.prevLink.style.display = this.nextLink.style.display = 'none';
	this.bottom.setStyles({opacity: '0', height: '0px', 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.setStyles({backgroundImage: 'url('+this.images[this.activeImage][0]+')', 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.images.length == 1) ? '' : 'Image '+(this.activeImage+1)+' of '+this.images.length);

if(this.activeImage != 0) 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.custom({height: [this.center.clientHeight, this.image.offsetHeight]});
				break;
}
this.step++;
case 2:
	if(this.center.clientWidth != this.image.offsetWidth) {
		this.fx.resize.custom({width: [this.center.clientWidth, this.image.offsetWidth], marginLeft: [-this.center.clientWidth/2, -this.image.offsetWidth/2]});
		break;
	}
	this.step++;
case 3:
	this.bottom.setStyles({top: (this.top + this.center.clientHeight)+'px', width: this.image.style.width, marginLeft: this.center.style.marginLeft, display: ''});
	this.fx.image.custom(0, 1);
	break;
case 4:
	if(this.options.animateCaption) {
		this.fx.bottom.custom({opacity: [0, 1], height: [0, this.bottom.scrollHeight]});
		break;
	}
	this.bottom.setStyles({opacity: '1', height: this.bottom.scrollHeight+'px'});
case 5:
	if(this.activeImage != 0) 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].clearTimer();
	this.center.style.display = this.bottom.style.display = 'none';
	this.fx.overlay.chain(this.setup.pass(false, this)).goTo(0);
	return false;
}
};

Window.onDomReady(Lightbox.init.bind(Lightbox));