/*

	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.

*/



var Lightbox = {



	init: function(options){

		this.options = $extend({

			resizeDuration: 400,

			resizeTransition: false,	// default transition

			initialWidth: 250,

			initialHeight: 250,

			animateCaption: true,

			showCounter: true

		}, options || {});



		this.anchors = [];

		$each(document.links, function(el){

			if (el.rel && 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', {'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.onclick = this.previous.bind(this);

		this.nextLink.onclick = this.next.bind(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();

	},



	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, 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(){

		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)) ? '' : 'Bild '+(this.activeImage+1)+' von '+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 = 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;

	}

};



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