/*
	Slimbox v1.41 - 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 = $extend({
			resizeDuration: 	250,
			resizeTransition: 	false,	// default transition
			initialWidth: 		250,
			initialHeight: 		250,
			animateCaption:	 	true,
			showCounter: 		true,
// *******************************************************************	
// GMS-IT		
			showGMSline:		true, // Vorwärts-rückwärts-Buttons 
			prevLinkTitle:		'zum vorherigen Bild',
			nextLinkTitle:		'zum nächsten Bild',
			closeLinkTitle:		'Bildschau schließen',
			bwardTitle:			'zum ersten Bild',		
			fwardTitle:			'zum letzten Bild',
			lbCommentTitle:		'Tastatur: W = weiter, Z = zurück, X = schließen, E = erstes Bild, L = letztes Bild'
// GMS-IT
// *******************************************************************			
		}, 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);
// *******************************************************************		
// GMS-IT
//vorher new Element('a', {'id': 'lbCloseLink', 'href': '#'}).injectInside(this.bottom).onclick = this.overlay.onclick = this.close.bind(this);
		this.closeLink = new Element('a', {'id': 'lbCloseLink', 'href': '#'}).injectInside(this.bottom);
		this.closeLink.onclick = this.overlay.onclick = this.close.bind(this);
// GMS-IT	
// *******************************************************************
	
		this.caption = new Element('div', {'id': 'lbCaption'}).injectInside(this.bottom);
		this.number = new Element('div', {'id': 'lbNumber'}).injectInside(this.bottom);

// *******************************************************************
// GMS-IT
		this.prevLink.title  = this.options.prevLinkTitle;
		this.nextLink.title  = this.options.nextLinkTitle;
		this.closeLink.title = this.options.closeLinkTitle;
		
// damit werden die bb und ff-buttons in eine neue Zeile gerbacht
		new Element('div', {'styles': {'clear': 'both'}}).injectInside(this.bottom);

// zurück
		this.bward = new Element('a', {'id': 'lbBackward', 'href': '#', 'styles': {'display': 'none'} }).injectInside(this.bottom);
		this.bward.onclick = this.first_img.bind(this);
		this.bward.title   = this.options.bwardTitle; 

// neue Zeile mit Kommentaren
//		new Element('div', {'id': 'lbComment', 'styles': {'clear': 'both'}}).injectInside(this.bottom);		
		this.lbComment = new Element('a', {'id': 'lbComment', 'href': '#',  'styles': {'display': 'none'}}).injectInside(this.bottom);
		this.lbComment.title   = this.options.lbCommentTitle; 
//		this.lbComment.onclick = this.myTimer.bind(this);

// vorwärts
		this.fward = new Element('a', {'id': 'lbForward', 'href': '#', 'styles': {'display': 'none'} }).injectInside(this.bottom);
		this.fward.onclick = this.last_img.bind(this);
		this.fward.title   = this.options.fwardTitle; 
// GMS-IT
// *******************************************************************
		
		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){
//		alert(event.keyCode);
		switch (event.keyCode){
// *******************************************************************		
// GMS-IT
			case 69: this.first_img(); break;
			case 76: this.last_img(); break;
// GMS-IT
// *******************************************************************			
			case 27: case 88: case 67: this.close(); break;
			case 37: case 80: case 90: this.previous(); break;  // case 90 GMS-IT
			case 39: case 78: case 87: this.next(); 			// case 87 GMS-IT
		}
	},
// *******************************************************************
// GMS-IT
	first_img: function(){
		return this.changeImage(0);
	},

	last_img: function(){
		return this.changeImage(this.images.length-1);
	},
	
	
	myTimer: function(){
		if (this.activeImage < this.images.length-1)
		{
			setTimeout(this.next(),50000);
//			this.next();
//			return;
		}
/*		while(this.activeImage < this.images.length-1) 
		{
//			alert(this.activeImage);
//			alert('YYY');	
//			this.next.delay(30000);
			setTimeout("this.next();",5000);
//	 		this.next(); //wait 5 seconds and execute my function.
			break;
		}  */
	},	
	
	nothing: function(){
		alert('nothing');
		return;
	},
	
// GMS-IT
// *******************************************************************

	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)) ? '' : 'Bild '+(this.activeImage+1)+' von '+this.images.length);

// *******************************************************************
// GMS-IT
			this.bward.style.display 		= (!this.options.showGMSline || this.activeImage   == 0 ? 'none' : 'block');
			this.lbComment.style.display	= (!this.options.showGMSline || this.images.length == 1 ? 'none' : 'block');
			this.fward.style.display 		= (!this.options.showGMSline || this.activeImage   == this.images.length-1 ? 'none' : 'block');
// GMS-IT
// *******************************************************************

			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));