/**************************************************************

   Script      : Lightbox
   Version     : 1.5
   Authors     : Samuel Birch
   Desc        : Extended version of Slimbox
   Licence     : Open Source MIT Licence

**************************************************************/

var Lightbox = {

   init: function(options){
      this.options = Object.extend({
         resizeDuration: 400,
         resizeTransition: Fx.Transitions.sineInOut,
         initialWidth: 250,
         initialHeight: 250,
         animateCaption: {In:true,Out:true},
         container: document.body,
         showControls: false,
         showNumbers: true,
         descriptions: false,
         opacity: 0.8
      }, 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').setProperty('id', 'lbOverlay').injectInside(this.options.container);

      this.center = new Element('div').setProperty('id', 'lbCenter').setStyles({width: this.options.initialWidth+'px', height: this.options.initialHeight+'px', marginLeft: '-'+(this.options.initialWidth/2)+'px', display: 'none'}).injectInside(this.options.container);
      this.image = new Element('div').setProperty('id', 'lbImage').injectInside(this.center);
      
      this.bottomContainer = new Element('div').setProperty('id', 'lbBottomContainer').setStyle('display', 'none').injectInside(this.options.container);
      this.bottom = new Element('div').setProperty('id', 'lbBottom').injectInside(this.bottomContainer);
      
      if(this.options.showControls){
         this.controlDiv = new Element('div').setProperty('id','lbControls').injectInside(this.bottom);
      }else{
         this.controlDiv = this.image;
      }
      this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('display', 'none').injectInside(this.controlDiv);
      this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.controlDiv);
      this.prevLink.onclick = this.previous.bind(this);
      this.nextLink.onclick = this.next.bind(this);

      this.closeButton = new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom)
      this.closeButton.onclick = this.overlay.onclick = this.close.bind(this);
      
      this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
      if(this.options.descriptions != false){
         this.options.descriptions = $$(this.options.descriptions);
         this.description = new Element('div').setProperty('id', 'lbDescription').injectInside(this.bottom);
      }
      if(this.options.showNumbers){
         this.number = new Element('div').setProperty('id', 'lbNumber').injectInside(this.bottom);
      }
      new Element('div').setStyle('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({duration: this.options.resizeDuration, transition: this.options.resizeTransition, onComplete: nextEffect}),
         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){
   
      this.options.descriptions.each(function(el,i){
         if(el.hasClass(link.id)){
            this.linkLoc = i;
         }
      },this);
            
      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.window = {};
      this.window.height = window.getScrollHeight();
      this.window.width = window.getScrollWidth();
      this.window.top = window.getScrollTop();
      this.window.left = window.getScrollLeft();
      this.center.setStyles({top: this.top+'px', display: ''});
      this.fx.overlay.start(this.options.opacity);
      return this.changeImage(imageNum);
   },

   position: function(){ 
      if(this.options.container == document.body){ 
         var h = window.getScrollHeight()+'px'; 
         var w = window.getScrollWidth()+'px';
         this.overlay.setStyles({top: '0px', height: h, width: w}); 
      }else{ 
         var myCoords = this.options.container.getCoordinates(); 
         this.overlay.setStyles({
            top: myCoords.top+'px', 
            height: myCoords.height+'px', 
            left: myCoords.left+'px', 
            width: myCoords.width+'px'
         }); 
      } 
   },

   setup: function(open){
      var elements = $A(document.getElementsByTagName('object'));
      if (window.ie) elements.extend(document.getElementsByTagName('select'));
      elements.each(function(el){ el.style.visibility = open ? 'hidden' : ''; });
      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(){
      this.linkLoc --;
      return this.changeImage(this.activeImage-1);
   },

   next: function(){
      this.linkLoc ++;
      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;
      if(this.options.animateCaption.In && this.bottom.offsetHeight){
         this.prevLink.style.display = this.nextLink.style.display = 'none';
         this.bottom.effect('margin-top', {duration: 300, onComplete: this.loadImage.bind(this)}).start(-this.bottom.offsetHeight);
      }else{
         this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
         this.loadImage();
      }
      this.fx.image.hide();
      this.center.className = 'lbLoading';
      
      return false;
   },
   
   loadImage: function(){
      this.preload = new Image();
      this.preload.onload = this.nextEffect.bind(this);
      this.preload.src = this.images[this.activeImage][0];
   },

   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';
         if(this.options.showControls){
            this.image.style.height = this.preload.height+'px';
         }else{
            this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'px';
         }

         this.caption.setHTML(this.images[this.activeImage][1] || '');
         if(this.options.descriptions != false){
            if(this.description.getFirst()){this.description.getFirst().remove()};
            var cl = this.options.descriptions[this.linkLoc].clone();
            cl.setStyle('display', 'block').injectInside(this.description);
         }
         if(this.options.showNumbers){
            this.number.setHTML((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)+'px', height: '0px', marginLeft: this.center.style.marginLeft, display: ''});
         this.fx.image.start(1);
         var extra = this.caption.getStyle('height').toInt();
         if(this.options.descriptions != false){extra += this.description.getStyle('height').toInt()}
         if(this.options.showControls){extra += this.controlDiv.getStyle('height').toInt()}
         if(this.options.showNumbers){extra += this.number.getStyle('height').toInt()}
         var num = (extra-(this.closeButton.getStyle('height').toInt()*2));
         if(num < 0){num=0}
         this.closeButton.setStyle('marginTop', num+'px');
         if(this.activeImage != 0) this.prevLink.style.display = '';
         if(this.activeImage != (this.images.length - 1)) this.nextLink.style.display = '';
         break;
      case 4:
         if (this.options.animateCaption.Out){
            this.fx.bottom.set(-this.bottom.offsetHeight);
            this.bottomContainer.style.height = '';
            this.fx.bottom.start(0);
            break;
         }
         this.bottomContainer.style.height = '';
      case 5:
         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);
      this.overlay.setStyles({height: this.window.height+'px', width: this.window.width+'px'});
      return false;
   }

};

/*************************************************************/