/*
	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: 300,	// 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)
		{
		  // The i in test('^lightbox', 'i') stands case-insensitive.
			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)
	{
		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);

		this.lightboxParam = link.rel.substring(link.rel.indexOf('[')+1,link.rel.indexOf(']'));

		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()
	{
	  if (this.lightboxParam.test('^gallery','i'))
		  return this.changeImage(this.activeImage-1);
	},

	next: function()
	{
	  if (this.lightboxParam.test('^gallery','i'))
		  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:
		  var image = this.images[this.activeImage][0];
		  image = image.replace("'","%27");
			this.image.setStyles({backgroundImage: 'url('+image+')', width: this.preload.width+'px'});
			this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'px';

			//Description
			this.caption.setHTML(this.images[this.activeImage][1] || '');

			//Display Image x of n in the bottom bar
			if (this.lightboxParam.test('^gallery','i'))
			  this.number.setHTML((this.images.length == 1) ? '' : 'Image '+(this.activeImage+1)+' de '+this.images.length);
			else
			  this.number.setHTML('');

			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:
		  // Display the PREV / NEXT buttons on image.
		  if (this.lightboxParam.test('^gallery','i'))
		  {
  			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));