/*
	ImageBox v1.0 by Valerio De Sanctis
	Based on: Slimbox v1.22 by Christophe Beyls (http://www.digitalia.be) - MIT-style license.
	Inspired by Lightbox v2 by Lokesh Dhakar.
		
	Permission is hereby granted, free of charge, to any person
	obtaining a copy of this software and associated documentation
	files (the "Software"), to deal in the Software without
	restriction, including without limitation the rights to use,
	copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the
	Software is furnished to do so, subject to the following
	conditions:

	The above copyright notice and this permission notice shall be
	included in all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
	OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
	HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
	WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	OTHER DEALINGS IN THE SOFTWARE.
*/

var ImageBox = {
	setup: function(open) 
	{
		var elements = $A(document.getElements('object'));
		elements.extend(document.getElements(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;
	},
	
		previous: function() 
	{
		return this.changeImage(this.activeImage-1);
	},

	next: function() 
	{
		return this.changeImage(this.activeImage+1);
	},

	init: function(options) 
	{
		this.options = Object.extend({
			relName: "ImageBox",	// The rel string to lookup for (in the format ImageBox[GalleryName] )
			resizeDuration: 300,	// Duration of height and width resizing (ms)
			initialWidth: 250,		// Initial width of the box (px)
			initialHeight: 250,		// Initial height of the box (px)
			minWidth: 250,			// minimum width of the box (px)
			animateCaption: true,	// Enable/Disable caption animation
			container: document.body,
			showControls: true,		// true: arrow in bottom  false: arrow over image
			showDescription: false,	// show or hide description
			opacity: 0.7
		}, options || {});
		
		//console.log(this.options.container);
		
		this.anchors = [];
		if (this.options.showDescription) this.options.descriptions=[];
		else this.options.descriptions=false;
		$A(document.getElements('a')).each(function(el)
		{
			if(el.rel && el.href && el.rel.test('^'+this.options.relName, 'i')) 
			{
				el.onclick = this.click.pass(el, this);
				this.anchors.push(el);
				if (this.options.showDescription) this.options.descriptions.push(el.innerHTML);
			}
		}, this);
		this.eventKeyDown = this.keyboardListener.bindWithEvent(this);
		this.eventPosition = this.position.bind(this);
		
		this.overlay = new Element('div').setProperty('id', 'ibOverlay').injectInside(this.options.container).setStyle('opacity',0);
		
		this.center = new Element('div').setProperty('id', 'ibCenter').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', 'ibImage').injectInside(this.center);
		
		this.bottom = new Element('div').setProperty('id', 'ibBottom').setStyle('display', 'none').injectInside(this.options.container);
		
		if(this.options.showControls){
			var controlDiv = this.bottom;	
		}else{
			var controlDiv = this.image;
		}
		this.prevLink = new Element('a').setProperties({id: 'ibPrevLink', href: '#'}).setProperty('class', 'nofade').setStyle('display', 'none').injectInside(controlDiv);
		this.nextLink = this.prevLink.clone().setProperty('id', 'ibNextLink').injectInside(controlDiv);
		this.prevLink.onclick = this.previous.bind(this);
		this.nextLink.onclick = this.next.bind(this);
		
		new Element('div').setStyle('clear', 'both').injectInside(this.bottom);
		this.closeButton = new Element('a').setProperties({id: 'ibCloseLink', href: '#'}).setProperty('class', 'nofade').injectInside(this.bottom);
		this.closeButton.onclick = this.overlay.onclick = this.close.bind(this);
		
		this.caption = new Element('div').setProperty('id', 'ibCaption').injectInside(this.bottom);
		if(this.options.descriptions != false)
		{
			//this.options.descriptions = $$(this.options.descriptions);
			this.description = new Element('div').setProperty('id', 'ibDescription').injectInside(this.bottom);
		}
		
		this.number = new Element('div').setProperty('id', 'ibNumber').injectInside(this.bottom);
		new Element('div').setStyle('clear', 'both').injectInside(this.bottom);
		
		var nextEffect = this.nextEffect.bind(this);
		this.fx = {
			overlay: new Fx.Morph(this.overlay, { duration: 500 }),
			resize: new Fx.Morph(this.center, { duration: this.options.resizeDuration, onComplete: nextEffect }),// this.center.effects({ duration: this.options.resizeDuration, onComplete: nextEffect }),
			image: new Fx.Slide(this.image, { duration: 500, transition: Fx.Transitions.Circ.easeInOut, onComplete: nextEffect }),
			bottom: new Fx.Morph(this.bottom,{ duration: 400, onComplete: nextEffect })// 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);
		this.fx.overlay.start({opacity : [0,this.options.opacity]});
		return this.changeImage(imageNum);
	},

	position: function() {
		//this.overlay.setStyles({top: Window.getScrollTop()+'px', height: Window.getHeight()+'px'});
		//this.overlay.setStyles({top: '0px', height: Window.getScrollHeight()+'px'});
		if(this.options.container == document.body){
			var h = Window.getScrollHeight()+'px';
		}else{
			var h = this.options.container.getStyle('height');
		}
		this.overlay.setStyles({top: '0px', height: h});
	},

	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();
		}
	},

	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 = 'ibLoading';
		
		this.preload = new Image();
		this.preload.onload = this.nextEffect.bind(this);
		this.preload.src = this.images[imageNum][0];
		return false;
	},

	nextEffect: function() 
	{
		imageWidth=(this.image.offsetWidth>this.options.minWidth)?this.image.offsetWidth:this.options.minWidth;
		switch(this.step++) {
		case 1:
			this.center.className = '';
			this.image.setStyles({backgroundImage: 'url('+this.images[this.activeImage][0]+')', width: ((this.preload.width>this.options.minWidth)?this.preload.width:this.options.minWidth)+'px'});
			//this.image.style.height = this.prevLink.style.height = this.nextLink.style.height = this.preload.height+'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.set('html',this.images[this.activeImage][1] || '');
			if(this.options.descriptions != false)
			{
				if(this.description.getFirst()){this.description.getFirst().remove()};
				var d = new Element('div');
				d.setText(this.options.descriptions[this.activeImage]);
				d.setStyle('display','block').injectInside(this.description);
//				var cl = this.options.descriptions[this.activeImage].clone();
//				cl.setStyle('display', 'block').injectInside(this.description);
			}
			this.number.set('html',(this.images.length == 1) ? '' : 'Immagine '+(this.activeImage+1)+' di '+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.start({height: [this.center.clientHeight, this.image.offsetHeight]});
				break;
			}
			this.step++;
		case 2:
			if(this.center.clientWidth != imageWidth) {
				this.fx.resize.start({width: [this.center.clientWidth, imageWidth], marginLeft: [-this.center.clientWidth/2, -imageWidth/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.slideIn(); //this.fx.image.start({opacity: [0, 1]}); // this.fx.image.slideIn(); //this.fx.image.start({opacity: [0, 1]});
			if(this.options.descriptions != false ){var extra = this.description.getStyle('height').toInt()}else{var extra = 0}
			this.closeButton.setStyle('marginTop', this.caption.getStyle('height').toInt()+extra+this.number.getStyle('height').toInt()-this.closeButton.getStyle('height').toInt()+'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) {
				this.fx.bottom.start({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);
		this.fx.overlay.start({opacity : [this.options.opacity,0]});
		return false;
	}
};

/*window.addEvent("load", initImageBox);
function initImageBox(){
	ImageBox.init();
}*/
//Window.onDomReady(ImageBox.init.bind(ImageBox));