/*by Luca Reghellin (http://www.reghellin.com) July 2008, MIT-style license.
	Inspiration from Slimbox by Christophe Beyls (http://www.digitalia.be) */
var Milkbox = new Class({

	Implements:Options,
	
	options:{//set all the options here
		overlayOpacity:0.7,
		topPosition:40,
		initialWidth:250,
		initialHeight:250,
		resizeDuration:500,
		resizeTransition:'sine:in:out',/*function (ex. Transitions.Sine.easeIn) or string (ex. 'quint:out')*/
		hoverBackgroundPosition:'0 -23px',
		autoPlay:false,
		autoPlayDelay:7,
		removeTitle:false
	},
	
	initialize: function(options){
		
this.setOptions(options);
this.galleries = [];
this.currentImage = null;
this.currentIndex = null;
this.currentGallery = null;
this.specialDescription = null;//for showThisImage
this.activated = false;//used in showThisImage 
this.mode = null;//'singleImage','imageGallery','showThisImage'
this.closed = true;
this.busy = true;//to control keyboard and autoplay events
		
this.intObj = null;
this.formtags = null;
this.loadedImages = [];
this.prepareGalleries();
if(this.galleries.length == 0){ return; };
this.initMilkbox(); },
initMilkbox:function(){
this.prepareHTML();
this.prepareEffects();
this.prepareEvents();
this.activated = true;
this.formtags = $$('select','textarea'); },
	
	openMilkbox:function(gallery,index){
		if(this.formtags.length != 0){ this.formtags.setStyle('display','none') };
this.overlay.setStyles({ 'top': -$(window).getScroll().y,'height':$(window).getScrollSize().y+$(window).getScroll().y });
this.center.addClass('mbLoading');
this.center.setStyle('top',$(window).getScroll().y+this.options.topPosition);
this.currentGallery = gallery;
this.currentIndex = index;
this.overlay.tween('opacity',this.options.overlayOpacity);//onComplete: center.tween opacity
		
		if(gallery.length == 1){
			this.mode = 'singleImage';
this.loadImages(gallery[index].href);
		} else {
			this.mode = 'imageGallery';var images = gallery.map(function(item){ return item.href; });
$$(this.prev, this.next, this.count).setStyles({'display':'block'});var border = this.center.getStyle('border-right-width').toInt();//border-right is just ok for design purposes..
			var navWidth = this.prev.getSize().x+this.next.getSize().x+this.close.getSize().x+border;
this.navigation.setStyle('width',navWidth);
this.description.setStyle('margin-right',navWidth); 
var next = (index != images.length-1) ? images[index+1] : images[0]; 
var prev = (index != 0) ? images[index-1] : images[images.length-1]; 
var preloads = (prev == next) ? [prev] : [prev,next]; //if gallery.length == 2, then prev == next
this.loadImages(images[index],preloads);}
this.closed = false; },
showThisImage:function(image,description){
if(!this.activated){ this.initMilkbox(); }
this.mode = 'showThisImage';
this.specialDescription = description;
this.overlay.setStyles({ 'top': -$(window).getScroll().y,'height':$(window).getScrollSize().y+$(window).getScroll().y });
this.center.addClass('mbLoading');
this.center.setStyle('top',$(window).getScroll().y+this.options.topPosition);
this.overlay.tween('opacity',this.options.overlayOpacity);//onComplete: center.tween opacity
		this.loadImages(image);
this.closed = false; },
 	showImage:function(image){
if(this.closed){ return; };
 		
 		var imageBoxSize = this.image.getSize();
this.image.setStyles({'opacity':0, 'width':'', 'height':''}); 
var imageSize = new Hash(image.getProperties('width','height')).map(function(item, index){
			return item.toInt();
		}); 
var centerSize = new Hash(this.center.getStyles('width','height')).map(function(item, index){
 			return item.toInt();
		}); 
var targetSize = {};
 		
 		if(imageSize.width != centerSize.width){ 
 			targetSize.width = imageSize.width;
 			targetSize.marginLeft = -(imageSize.width/2).round();
 		}; 
var gap = (imageBoxSize.y > 0) ? centerSize.height - imageBoxSize.y : 0; 
var targetHeight = imageSize.height + gap;

 	   targetSize.height = targetHeight;
 	   
		//so nav doesn't move when you click next/prev
		this.image.setStyles({'width':imageSize.width, 'height':imageSize.height})

 		this.center.removeClass('mbLoading');
this.center.morph(targetSize);},
 	
	loadImages:function(currentImage,preloads){
			var loadImage = new Asset.image(currentImage, { onload:function(img){
				this.currentImage = img;
				if(!this.loadedImages.contains(currentImage)){ this.loadedImages.push(currentImage); };//see next/prev events
				$$(this.description,this.navigation).setStyle('visibility','hidden');
this.navigation.setStyle('height','');//reset the height setted in center.morph.onComplete
				$$(this.next,this.prev,this.close).setStyle('backgroundPosition','0 0');
this.showImage(this.currentImage);
			}.bindWithEvent(this)});
			
			if(preloads && !this.loadedImages.contains(preloads)){
				var preloadImages = new Asset.images(preloads, { onComplete:function(img){
					preloads.each(function(item){
						if(!(this.loadedImages.contains(item))){ this.loadedImages.push(item); }
					}.bind(this));
				}.bindWithEvent(this)});
			}; },
prepareEvents:function(){
this.galleries.each(function(gallery){
			$$(gallery).addEvent('click',function(e){
				var button=($(e.target).match('a')) ? $(e.target) : $(e.target).getParent('a');
				e.preventDefault();
if(this.options.autoPlay){
this.autoPlay({ gallery:gallery, index:gallery.indexOf(button) });
}
else{ this.openMilkbox(gallery, gallery.indexOf(button)); }
}.bindWithEvent(this)); },this);
this.next.addEvent('click',this.next_prev_aux.bindWithEvent(this,'next'));
this.prev.addEvent('click',this.next_prev_aux.bindWithEvent(this,'prev'));
$(window.document).addEvent('keydown',function(e){
			if(this.mode != 'imageGallery' || this.busy == true){ return; };
			if(e.key == 'right' || e.key == 'space'){ this.next_prev_aux(e,'next'); }
			else if(e.key == 'left'){ this.next_prev_aux(e,'prev'); }
			else if(e.key == 'esc'){ this.closeMilkbox(); };
		}.bindWithEvent(this));
$$(this.next,this.prev,this.close).addEvents({
				'mouseover':function(e){ 
					var button=($(e.target).match('a')) ? $(e.target) : $(e.target).getParent('a');
					button.setStyle('backgroundPosition',this.options.hoverBackgroundPosition); 
				}.bindWithEvent(this),
				'mouseout':function(){ this.setStyle('backgroundPosition','0 0'); }
		});
this.overlay.get('tween').addEvent('onComplete',function(){
			if(this.overlay.getStyle('opacity') == this.options.overlayOpacity){ 
				this.center.tween('opacity',1);
			} else if(this.overlay.getStyle('opacity') == 0) {
				this.overlay.setStyles({'height':0,'top':''});
			};
		}.bindWithEvent(this));
this.center.get('morph').addEvent('onComplete',function(){
 this.image.grab(this.currentImage);
this.image.tween('opacity',1); 
var d = (!(this.mode == 'showThisImage')) ? this.currentGallery[this.currentIndex].retrieve('title') : this.specialDescription;
			 if($chk(d)){ this.description.innerHTML = d; };
 if(this.mode == 'imageGallery'){ 
this.count.appendText((this.currentIndex+1)+' of '+this.currentGallery.length); 
}
var currentCenterHeight = this.center.getStyle('height').toInt();
this.navigation.setStyle('height',this.bottom.getStyle('height').toInt());//to have the right-border height == total bottom height
var bottomSize = this.bottom.getSize().y;
var targetOffset = (currentCenterHeight > this.image.getSize().y) ? (this.bottom.getSize().y+this.image.getSize().y)-currentCenterHeight : bottomSize;
this.bottom.setStyle('display','none');//to avoid rendering problems during setFinalHeight
this.center.retrieve('setFinalHeight').start(currentCenterHeight,currentCenterHeight+targetOffset);
}.bindWithEvent(this));
this.center.retrieve('setFinalHeight').addEvent('onComplete',function(){
this.bottom.setStyles({'visibility':'visible','display':'block'});
$$(this.description,this.navigation).setStyle('visibility','visible');
var scrollSize = $(window).getScrollSize().y; 
var scrollTop = $(window).getScroll().y;
this.overlay.setStyle('height',scrollSize+scrollTop);
this.busy = false;
		}.bindWithEvent(this));
		window.addEvent('resize',function(){
			if(this.overlay.getStyle('opacity') == 0){ return; };//resize only if visible
			var scrollSize = $(window).getScrollSize().y; 
var scrollTop = $(window).getScroll().y;
this.overlay.setStyles({ 'height':scrollSize+scrollTop,'top':-scrollTop });
		}.bindWithEvent(this))

		//close
		$$(this.overlay,this.image,this.close).addEvent('click',function(){ this.closeMilkbox(); }.bindWithEvent(this)); },
	
	next_prev_aux:function(e,direction){
		
		if(e){ 
			e.preventDefault();
			if(this.intObj){ $clear(this.intObj);
this.intObj = null; };
		} 
		else{ if(this.busy){ return; } }
		this.busy = true; 
		var backupIndex = this.currentIndex;
		if(direction == "next"){
			var i= (this.currentIndex != this.currentGallery.length-1) ? this.currentIndex += 1 : this.currentIndex = 0; 
var _i= (this.currentIndex != this.currentGallery.length-1) ? this.currentIndex + 1 : 0;
		} else {
			var i= (this.currentIndex != 0) ? this.currentIndex -= 1 : this.currentIndex = this.currentGallery.length-1; 
var _i= (this.currentIndex != 0) ? this.currentIndex - 1 : this.currentGallery.length-1;		
		};
this.image.empty();
this.description.empty();
this.count.empty();
if(!this.loadedImages.contains(this.currentGallery[i].href)){ 
this.center.addClass('mbLoading');};
this.loadImages(this.currentGallery[i].href,[this.currentGallery[_i].href]); },
autoPlay:function(obj){//obj: gallery, index, delay (in seconds)
var g = (obj && obj.gallery && ($type(obj.gallery) == 'array')) ? obj.gallery : Milkbox.galleries[0]; 
var i = (obj && obj.index && ($type(obj.index) == 'number')) ? obj.index : 0; 
var d = (obj && obj.delay && ($type(obj.delay) == 'number')) ? obj.delay*1000 : this.options.autoPlayDelay*1000;
if(d < this.options.resizeDuration*2){ d = this.options.resizeDuration*2 };
Milkbox.openMilkbox(g,i);
if(this.mode != 'imageGallery'){ return; };
this.intObj = this.next_prev_aux.periodical(d,this,[null,'next']); },
closeMilkbox:function(){
this.cancelAllEffects();
if(this.intObj){ $clear(this.intObj); };
this.currentImage = null;
this.currentIndex = null;
this.currentGallery = null;
$$(this.prev, this.next, this.count).setStyle('display','none'); 
var border = this.center.getStyle('border-right-width').toInt(); 
var navWidth = this.close.getSize().x+border;
this.navigation.setStyles({'width':navWidth,'height':'','visibility':'hidden'});
this.description.setStyle('margin-right',navWidth);
this.description.empty();
this.bottom.setStyles({'visibility':'hidden','display':''});
this.image.setStyles({'opacity':0, 'width':'', 'height':''});
this.image.empty();
this.count.empty();
this.center.setStyles({'opacity':0,'width':this.options.initialWidth,'height':this.options.initialHeight,'marginLeft':-(this.options.initialWidth/2)});
this.overlay.tween('opacity',0);//see onComplete in prepareEvents() 
if(this.formtags.length != 0){ this.formtags.setStyle('display','') };
this.mode = null;
this.closed = true; },
	cancelAllEffects:function(){
		this.overlay.get('tween').cancel();
this.center.get('morph').cancel();
this.center.get('tween').cancel();
this.center.retrieve('setFinalHeight').cancel();
this.image.get('tween').cancel(); },
	prepareEffects:function(){
		this.overlay.set('tween',{ duration:'short',link:'cancel' });
this.center.set('tween',{ duration:'short',link:'chain' });
this.center.set('morph',{ duration:this.options.resizeDuration,link:'chain',transition:this.options.resizeTransition });
this.center.store('setFinalHeight',new Fx.Tween(this.center,{property:'height',duration:'short'}));
this.image.set('tween',{ link:'chain' }); },
	prepareGalleries:function(){
		var families = []; 
var milkbox_a = [];
$$('a').each(function(a){
			//test 'milkbox' and link extension, and collect all milkbox links
			if(a.rel && a.rel.test(/^milkbox/i) && a.href.split('?')[0].test(/\.(gif|jpg|png)$/i)){
				if(a.rel.length>7 && !families.contains(a.rel)){ families.push(a.rel); };
				milkbox_a.push(a);
			}
		},this);
		milkbox_a.each(function(a){
			$(a).store('href',a.href);
$(a).store('rel',a.rel);
$(a).store('title',a.title);
			if(this.options.removeTitle){ $(a).removeProperty('title'); }
			if(a.rel.length > 7){
				families.each(function(f,i){
					if(a.rel == f){
						if(!this.galleries[i]){ this.galleries[i] = [] };
this.galleries[i].push($(a));
					}; },this);
			} else { this.galleries.push([$(a)]); }; },this); },
		
prepareHTML:function(){
this.overlay = new Element('div', { 'id':'mbOverlay','styles':{ 'opacity':0,'visibility':'visible','height':0,'overflow':'hidden' }}).inject($(document.body));
this.center = new Element('div', {'id':'mbCenter', 'styles':{'width':this.options.initialWidth,'height':this.options.initialHeight,'marginLeft':-(this.options.initialWidth/2),'opacity':0/**/}}).inject($(document.body));
this.image = new Element('div', {'id':'mbImage'}).inject(this.center);
this.bottom = new Element('div',{'id':'mbBottom'}).inject(this.center).setStyle('visibility','hidden');
this.navigation = new Element('div',{'id':'mbNavigation'}).setStyle('visibility','hidden');
this.description = new Element('div',{'id':'mbDescription'}).setStyle('visibility','hidden');
this.bottom.adopt(this.navigation, this.description, new Element('div',{'class':'clear'}));
this.close = new Element('a',{'id':'mbCloseLink'});
this.next = new Element('a',{'id':'mbNextLink'});
this.prev = new Element('a',{'id':'mbPrevLink'});
this.count = new Element('span',{'id':'mbCount'});
$$(this.next, this.prev, this.count).setStyle('display','none');
this.navigation.adopt(this.close, this.next, this.prev,new Element('div',{'class':'clear'}), this.count);}
});
window.addEvent('domready', function(){ Milkbox = new Milkbox();});