/*

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));

