/*
       Slimbox v1.4 - 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();

       // enhanced for translated image cpations
          var browserLang  = navigator.language ? navigator.language : navigator.userLanguage;
          if(browserLang) {
             browserLang = browserLang.substr(0,2);
             browserLang = browserLang.toLowerCase();
          } else {
             browserLang = 'en';
          }
          this.captionWords = new Array('Image', 'of');
          switch(browserLang) {
             case 'de':   this.captionWords = Array('Bild', 'von'); break;
             case 'es':   this.captionWords = Array('Imagen', 'de'); break;
             case 'fr':   this.captionWords = Array('Image', 'de'); break;
             case 'nl':   this.captionWords = Array('Afbeelding', 'van'); break;
             case 'da':   this.captionWords = Array('billede', 'fra'); break;
          }
          // end enhancement

       },

       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.center.style.backgroundColor = '';
          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);
             this.number.setHTML((!this.options.showCounter || (this.images.length == 1)) ? '' : this.captionWords[0]+' '+(this.activeImage+1)+' '+this.captionWords[1]+' '+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:
             this.center.style.backgroundColor = '#000';
             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));