/*
	Slimbox v1.3 - 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,
			resizeTransition: Fx.Transitions.sineInOut,
			initialWidth: 250,
			initialHeight: 250,
			animateCaption: 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);
		if(window.ie6 != true){
			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.contents = new Element('div').setProperty('id', 'mb_contents').injectInside(this.center);
		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.bottomContainer = new Element('div').setProperty('id', 'lbBottomContainer').setStyle('display', 'none').injectInside(document.body);
		this.bottom = new Element('div').setProperty('id', 'lbBottom').injectInside(this.bottomContainer);

		if(window.ie6 != true){
			new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
		}else{
			new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom).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);
		this.Navegacion = new Element('div').setProperty('id', 'navegacion').injectInside(this.bottom);
		this.prevLink2 = new Element('span').setProperty('id', 'prevnavegacion').setStyle('cursor', 'pointer').injectInside(this.Navegacion);
		this.nextLink2 = new Element('span').setProperty('id', 'nextnavegacion').setStyle('cursor', 'pointer').injectInside(this.Navegacion);
		this.prevLink2.setHTML('Anterior ');
		this.nextLink2.setHTML(' Siguiente');
		this.prevLink2.onclick = this.previous.bind(this);
		this.nextLink2.onclick = this.next.bind(this);
		new Element('div').setStyle('clear', 'both').injectInside(this.bottom);

		var nextEffect = this.nextEffect.bind(this);
		if(window.ie6 != true){
			this.fx = {
				overlay: this.overlay.effect('opacity', {duration: 500}).hide(),
				resize: this.center.effects({duration: this.options.resizeDuration, transition: this.options.resizeTransition, onComplete: nextEffect}),
				contents: this.image.effect('opacity', {duration: 500, onComplete: nextEffect}),
				image: this.image.effect('opacity', {duration: 500, onComplete: nextEffect}),
				bottom: this.bottom.effect('margin-top', {duration: 400, onComplete: nextEffect})
			};
		}else{
			this.fx = {
				resize: this.center.effects({duration: this.options.resizeDuration, transition: this.options.resizeTransition, onComplete: nextEffect}),
				contents: this.image.effect('opacity', {duration: 500, 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){
		var aux = link.href.split("#");
		if(aux==link.href){
			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);
		}else{
			var Wsize = aux[1].split("@");
			return this.openHTML(aux[0], Wsize[0], Wsize[1]);
			
		}
	},
	
	openHTML:function(url2go, A, H){
		this.position();
		this.setup(true);
		this.top = window.getScrollTop() + (window.getHeight() / 15);
		this.center.setStyles({top: this.top+'px', display: ''});
		if(window.ie6 != true){
			this.fx.overlay.start(0.8);
		}
		return this.loadContents(url2go, A, H);	
	},
	loadContents: function(url2go, A, H){
		
		if(this.step) return false;
		this.step = 6;
		this.options.contentsWidth = A;
		this.options.contentsHeight = H;
		this.bottomContainer.style.display = this.prevLink2.style.display = this.nextLink2.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';
		this.fx.image.hide();
		this.center.className = 'lbLoading';
		
		this.fx.contents.hide();
		var nextEffect = this.nextEffect.bind(this);
		var ajaxLoad = new Ajax(url2go, {update: this.contents, onComplete: nextEffect, onStateChange: this.ajaxStateChange}).request();
		return false;
	},
	ajaxStateChange: function (){
		// error handling still needs some tweaking
		if (this.transport.readyState != 4) return;
		var status;
		try { status = this.transport.status; } catch(e) { status = 0; }
		if ((status >= 200) && (status < 300)){
		//success
		} else {
		// oops.. something's gone wrong !
			alert ("There was a problem loading your page.\nPlease try again."+this.transport.status);
		}	
		this.transport.onreadystatechange = Class.empty;
	},
	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: ''});
		if(window.ie6 != true){
			this.fx.overlay.start(0.8);
		}
		return this.changeImage(imageNum);
	},
	position: function(){
		if(window.ie6 != true){
			this.overlay.setStyles({top: window.getScrollTop()+'px', height: window.getHeight()+'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(){
		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.prevLink2.style.display = this.nextLink2.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(){
		var aux = this.step++;
		switch (aux){
		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.prevLink2.style.height = this.nextLink2.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) ? '' : '[ '+(this.activeImage+1)+' de '+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);
			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.prevLink2.style.display = '';
			if (this.activeImage != (this.images.length - 1)) this.nextLink.style.display = '';
			if (this.activeImage != (this.images.length - 1)) this.nextLink2.style.display = '';
			this.step = 0;
			break;
			
		case 6:
			this.center.className = '';
			this.caption.setHTML(this.title);
			
			this.contents.setStyles ({width: this.options.contentsWidth + "px", height: this.options.contentsHeight + "px"});
			this.bottomContainer.setStyles ({width: this.options.contentsWidth + "px", height: this.options.contentsHeight + "px"});

			if(this.center.clientHeight != this.contents.offsetHeight) {
				this.fx.resize.custom({height: [this.center.clientHeight, this.contents.offsetHeight]});
				break;
			}
			this.step++;
					
		case 7:
			if (this.center.clientWidth != this.contents.offsetWidth) {
				this.fx.resize.custom({width: [this.center.clientWidth, this.contents.offsetWidth], marginLeft: [-this.center.clientWidth/2, -this.contents.offsetWidth/2]});
				break;
			}
			this.step++;
			//this.step = 7;
		case 8:
			this.bottomContainer.setStyles({top: (this.top + this.center.clientHeight)+'px', height: '0px', marginLeft: this.center.style.marginLeft, display: ''});
			this.fx.contents.custom(0,1);
			break;
		
		case 9:
			if (this.options.animateCaption){
				this.fx.bottom.set(-this.options.contentsWidth);
				this.bottomContainer.style.height = '';
				this.fx.bottom.start(0);
				break;
			}
			this.bottomContainer.style.height = '';	
		case 10:
			this.step = 0;
			break;
		}			
	},

	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';
		if(window.ie6 != true){
			this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
		}
		return false;
	}
};

window.addEvent('domready', Lightbox.init.bind(Lightbox));