/*
 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.
*/
/*

Modified by Luke Mills
21/8/2008

Displays caption and close button at the top as well as at the bottom
if the bottom caption bar is below the bottom of the window.

Note: all new class member variables are prefixed with '_' to avoid
name clashes.

*/

 var Lightbox = {

     init: function(options){
         this.options = $extend({
             resizeDuration: 400,
             resizeTransition: false, // default transition
             initialWidth: 250,
             initialHeight: 250,
             animateCaption: true,
             showCounter: true,
             opacity: 0.2
         }, 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._topContainer = new Element('div', {'id': 'lbTopContainer', 'styles': {'display': 'none'}}).injectInside(document.body);
         this._top = new Element('div', {'id': 'lbTop'}).injectInside(this._topContainer);
         new Element('a', {'id': 'lbCloseLinkTop', 'href': '#'}).injectInside(this._top).onclick = this.close.bind(this);
         this._captionTop = new Element('div', {'id': 'lbCaptionTop'}).injectInside(this._top);
         this._numberTop = new Element('div', {'id': 'lbNumber'}).injectInside(this._top);
         new Element('div', {'styles': {'clear': 'both'}}).injectInside(this._top);

         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}),
             top: this._top.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) + 64;
         this.center.setStyles({top: this.top, display: ''});
         this.fx.overlay.start(this.options.opacity);
         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._top.style.width = this.preload.width+'px';
             this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'px';

             var captionHTML = this.images[this.activeImage][1] || '';
             var numberHTML = (!this.options.showCounter || (this.images.length == 1)) ? '' : 'Image '+(this.activeImage+1)+' of '+this.images.length;
             this._captionTop.setHTML(captionHTML);
             this._numberTop.setHTML(numberHTML);
             this.caption.setHTML(captionHTML);
             this.number.setHTML(numberHTML);

             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._topContainer.setStyles({top: this.top, 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 = '';
             break;
         case 5:
             if (this.options.animateCaption && window.getHeight() < this.top + this.center.clientHeight + this.bottom.offsetHeight){
                 this.fx.top.set(0);
                 this._topContainer.style.height = '';
                 this.fx.top.start(-this._top.offsetHeight);
                 break;
             }
             this._topContainer.style.height = '';
             break;
         case 6:
             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 = this._topContainer.style.display = 'none';
         this.fx.top.set(0);
         this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
         return false;
     }
 };

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