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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)) ? '' : 'Obrzok '+(this.activeImage+1)+' z '+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));