/*
Slimbox v1.22 - 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 = Object.extend({
         resizeDuration: 400, // Duration of height and width resizing (ms)
         initialWidth: 250,      // Initial width of the box (px)
         initialHeight: 250,     // Initial height of the box (px)
         animateCaption: true // Enable/Disable caption animation
      }, options || {});
      
      this.anchors = [];
      $A(document.getElementsByTagName('a')).each(function(el){
         if(el.rel && el.href && 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(document.body);
      
      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(document.body);
      this.image = new Element('div').setProperty('id', 'lbImage').injectInside(this.center);
      this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('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.bottom = new Element('div').setProperty('id', 'lbBottom').setStyle('display', 'none').injectInside(document.body);
      new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
      this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);
      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, onComplete: nextEffect }),
         image: this.image.effect('opacity', { duration: 500, onComplete: nextEffect }),
         bottom: this.bottom.effects({ 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+'px', display: ''});
      this.fx.overlay.goTo(0.8);
      return this.changeImage(imageNum);
   },

   position: function() {
      this.overlay.setStyles({top: Window.getScrollTop()+'px', height: Window.getHeight()+'px'});
   },

   setup: function(open) {
      var elements = $A(document.getElementsByTagName('object'));
      elements.extend(document.getElementsByTagName(window.ActiveXObject ? 'select' : 'embed'));
      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() {
      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.prevLink.style.display = this.nextLink.style.display = 'none';
      this.bottom.setStyles({opacity: '0', height: '0px', 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.setStyles({backgroundImage: 'url('+this.images[this.activeImage][0]+')', 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.images.length == 1) ? '' : 'Imagen '+(this.activeImage+1)+' de '+this.images.length);
         
         if(this.activeImage != 0) 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.custom({height: [this.center.clientHeight, this.image.offsetHeight]});
            break;
         }
         this.step++;
      case 2:
         if(this.center.clientWidth != this.image.offsetWidth) {
            this.fx.resize.custom({width: [this.center.clientWidth, this.image.offsetWidth], marginLeft: [-this.center.clientWidth/2, -this.image.offsetWidth/2]});
            break;
         }
         this.step++;
      case 3:
         this.bottom.setStyles({top: (this.top + this.center.clientHeight)+'px', width: this.image.style.width, marginLeft: this.center.style.marginLeft, display: ''});
         this.fx.image.custom(0, 1);
         break;
      case 4:
         if(this.options.animateCaption) {
            this.fx.bottom.custom({opacity: [0, 1], height: [0, this.bottom.scrollHeight]});
            break;
         }
         this.bottom.setStyles({opacity: '1', height: this.bottom.scrollHeight+'px'});
      case 5:
         if(this.activeImage != 0) 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].clearTimer();
      this.center.style.display = this.bottom.style.display = 'none';
      this.fx.overlay.chain(this.setup.pass(false, this)).goTo(0);
      return false;
   }
};

Window.onDomReady(Lightbox.init.bind(Lightbox));