/*
 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)+' of '+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));