/*
	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.
	
	edit by rollmotz@rollmotz.de:
	- shows contents of <label>...</label> as caption instead of the title property
	- fixed overlay
	- fixed center-element
	- slideshow
*/

var Lightbox = {
	init: function(options){
		this.options = $extend({
			resizeDuration: 400,
			resizeTransition: false,	// default transition
			initialWidth: 250,
			initialHeight: 250,
			animateCaption: true,
			showCounter: true,
			slideAutoStart: false,
			slideTime: 5,
			strings: {
				image: 'Image ',
				of: ' of ',
				slideShowStart:	'start slideshow',
				slideShowStop:	'stop slideshow'
			}
		}, 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', 'styles': {'top': 0}}).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.exif = new Element('div', {'id': 'lbExif'}).injectInside(this.bottom);
		this.number = new Element('div', {'id': 'lbNumber'}).injectInside(this.bottom);
// rollmotz@rollmotz.de start
		this.slideControl = new Element('a', {'id': 'lbSlideControl', 'href': '#'}).injectInside(this.bottom);
		this.slideControl.setText(this.options.strings.slideShowStart);
		this.slideControl.onclick = this.toggleSlideShow.bind(this);
// rollmotz@rollmotz.de emd
		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, this.getDescription(link));

		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, this.getDescription(el), this.getExifData(el)]);
					images.push(el);
					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() + 50;
		this.center.setStyles({top: this.top, display: ''});
		this.fx.overlay.start(0.8);
		
// rollmotz@rollmotz.de start
		if(this.options.slideAutoStart)
			this.startSlideShow();
// rollmotz@rollmotz.de end
		
		return this.changeImage(imageNum);
	},

	position: function(){
		var pageDimensions = this.getPageSize();
		this.overlay.setStyles({'width': pageDimensions[0], 'height': pageDimensions[1]});
	},

	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]('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)) {
			this.stopSlideShow(); // rollmotz@rollmotz.de
			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];
		this.preload.src = this.images[imageNum].href;
		
		return false;
	},

	nextEffect: function(){
		switch (this.step++){
		case 1:
			this.center.className = '';
			this.image.style.backgroundImage = 'url('+this.images[this.activeImage].href+')';
			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.getDescription(this.images[this.activeImage]) || '');
			this.exif.setHTML(this.getExifData(this.images[this.activeImage]) || '');
			this.number.setHTML((!this.options.showCounter || (this.images.length == 1)) ? '' : this.options.strings.image + (this.activeImage+1)+ this.options.strings.of + this.images.length);

			if (this.activeImage) this.preloadPrev.src = this.images[this.activeImage-1].href;
			if (this.activeImage != (this.images.length - 1)) this.preloadNext.src = this.images[this.activeImage+1].href;
			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);
		
// rollmotz@rollmotz.de start
		this.stopSlideShow();
// rollmotz@rollmotz.de end
		
		return false;
	},
	
// rollmotz@rollmotz.de start
	//
	// getPageSize()
	// Returns array with page width, height and window width, height
	// Core code from - quirksmode.com
	// Edit for Firefox by pHaez
	//
	getPageSize: function(){
		var xScroll, yScroll;
		
		if (window.innerHeight && window.scrollMaxY) {	
			xScroll = window.innerWidth + window.scrollMaxX;
			yScroll = window.innerHeight + window.scrollMaxY;
		} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
			xScroll = document.body.scrollWidth;
			yScroll = document.body.scrollHeight;
		} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
			xScroll = document.body.offsetWidth;
			yScroll = document.body.offsetHeight;
		}
		
		var windowWidth, windowHeight;
		
		if (self.innerHeight) {	// all except Explorer
			if(document.documentElement.clientWidth){
				windowWidth = document.documentElement.clientWidth; 
			} else {
				windowWidth = self.innerWidth;
			}
			windowHeight = self.innerHeight;
		} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
			windowWidth = document.documentElement.clientWidth;
			windowHeight = document.documentElement.clientHeight;
		} else if (document.body) { // other Explorers
			windowWidth = document.body.clientWidth;
			windowHeight = document.body.clientHeight;
		}

		// for small pages with total height less then height of the viewport
		if(yScroll < windowHeight){
			pageHeight = windowHeight;
		} else { 
			pageHeight = yScroll;
		}
		
		// for small pages with total width less then width of the viewport
		if(xScroll < windowWidth){
			pageWidth = xScroll;
		} else {
			pageWidth = windowWidth;
		}
		
		return [pageWidth + 'px', pageHeight + 'px', windowWidth + 'px', windowHeight + 'px'];
	},
	
	getDescription: function(e) {
		var elm = $(e);
		var labels = elm.getElementsBySelector('label');
		if(labels.length == 0) {
			return e.getAttribute('title');
		} else {
/*			if (unescapeDescription)
				return labels[0].innerHTML.unescapeHTML(); // valid html
			else*/
				return labels[0].innerHTML; // not valid html if you
		}
	},
	
	getExifData: function(e) {
		var elm = $(e).getParent();
		var exif = elm.getElementsByTagName('span');
		return exif[0].innerHTML;
	},
	
	startSlideShow: function(){
		if(! $defined(this.slideTimer)) {
			this.slideControl.setText(this.options.strings.slideShowStop);
			this.slideTimer = this.next.periodical(this.options.slideTime * 1000, this);
		}
	},
	
	stopSlideShow: function(){
		if($defined(this.slideTimer)) {
			this.slideControl.setText(this.options.strings.slideShowStart);
			$clear(this.slideTimer);
			this.slideTimer = null;
		}
	},
	
	toggleSlideShow: function(){
		if($defined(this.slideTimer))
			this.stopSlideShow();
		else
			this.startSlideShow();
		
		return false;
	}
// rollmotz@rollmotz.de end
};

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

/*var myTips = new Tips($$('.Tips'), {
	maxTitleChars: 50	//I like my captions a little long
});
*/