/*
		 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)) ? '' : 'Image '+(this.activeImage+1)+' sur '+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));