/**************************************************************



	Script		: Lightbox

	Version		: 1.5

	Authors		: Samuel Birch

	Desc		: Extended version of Slimbox

	Licence		: Open Source MIT Licence



**************************************************************/



var Lightbox = {



	init: function(options){

		this.options = Object.extend({

			resizeDuration: 500,

			resizeTransition: Fx.Transitions.sineInOut,

			initialWidth: 250,

			initialHeight: 250,

			animateCaption: {In:true,Out:true},

			container: document.body,

			showControls: false,

			showNumbers: true,

			descriptions: false,

			opacity: 0.5

		}, 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').setProperty('id', 'lbOverlay').injectInside(this.options.container);



		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(this.options.container);

		this.image = new Element('div').setProperty('id', 'lbImage').injectInside(this.center);

		

		this.bottomContainer = new Element('div').setProperty('id', 'lbBottomContainer').setStyle('display', 'none').injectInside(this.options.container);

		this.bottom = new Element('div').setProperty('id', 'lbBottom').injectInside(this.bottomContainer);

		

		if(this.options.showControls){

			this.controlDiv = new Element('div').setProperty('id','lbControls').injectInside(this.bottom);

		}else{

			this.controlDiv = this.image;

		}

		this.prevLink = new Element('a').setProperties({id: 'lbPrevLink', href: '#'}).setStyle('display', 'none').injectInside(this.controlDiv);

		this.nextLink = this.prevLink.clone().setProperty('id', 'lbNextLink').injectInside(this.controlDiv);

		this.prevLink.onclick = this.previous.bind(this);

		this.nextLink.onclick = this.next.bind(this);



		this.closeButton = new Element('a').setProperties({id: 'lbCloseLink', href: '#'}).injectInside(this.bottom)

		this.closeButton.onclick = this.overlay.onclick = this.close.bind(this);

		

		this.caption = new Element('div').setProperty('id', 'lbCaption').injectInside(this.bottom);

		if(this.options.descriptions != false){

			this.options.descriptions = $$(this.options.descriptions);

			this.description = new Element('div').setProperty('id', 'lbDescription').injectInside(this.bottom);

		}

		if(this.options.showNumbers){

			this.number = new Element('div').setProperty('id', 'lbNumber').injectInside(this.bottom);

		}

		new Element('div').setStyle('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({duration: this.options.resizeDuration, transition: this.options.resizeTransition, 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){

	

		this.options.descriptions.each(function(el,i){

			if(el.hasClass(link.id)){

				this.linkLoc = i;

			}

		},this);

				

		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.window = {};

		this.window.height = window.getScrollHeight();

		this.window.width = window.getScrollWidth();

		this.window.top = window.getScrollTop();

		this.window.left = window.getScrollLeft();

		this.center.setStyles({top: this.top+'px', display: ''});

		this.fx.overlay.start(this.options.opacity);

		return this.changeImage(imageNum);

	},



	position: function(){ 

		if(this.options.container == document.body){ 

			var h = window.getScrollHeight()+'px'; 

			var w = window.getScrollWidth()+'px';

			this.overlay.setStyles({top: '0px', height: h, width: w}); 

		}else{ 

			var myCoords = this.options.container.getCoordinates(); 

			this.overlay.setStyles({

				top: myCoords.top+'px', 

				height: myCoords.height+'px', 

				left: myCoords.left+'px', 

				width: myCoords.width+'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(){

		this.linkLoc --;

		return this.changeImage(this.activeImage-1);

	},



	next: function(){

		this.linkLoc ++;

		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;

		if(this.options.animateCaption.In && this.bottom.offsetHeight){

			this.prevLink.style.display = this.nextLink.style.display = 'none';

			this.bottom.effect('margin-top', {duration: 300, onComplete: this.loadImage.bind(this)}).start(-this.bottom.offsetHeight);

		}else{

			this.bottomContainer.style.display = this.prevLink.style.display = this.nextLink.style.display = 'none';

			this.loadImage();

		}

		this.fx.image.hide();

		this.center.className = 'lbLoading';

		

		return false;

	},

	

	loadImage: function(){

		this.preload = new Image();

		this.preload.onload = this.nextEffect.bind(this);

		this.preload.src = this.images[this.activeImage][0];

	},



	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';

			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.setHTML(this.images[this.activeImage][1] || '');

			if(this.options.descriptions != false){

				if(this.description.getFirst()){this.description.getFirst().remove()};

				var cl = this.options.descriptions[this.linkLoc].clone();

				cl.setStyle('display', 'block').injectInside(this.description);

			}

			if(this.options.showNumbers){

				this.number.setHTML((this.images.length == 1) ? '' : 'Image '+(this.activeImage+1)+' of '+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);

			var extra = this.caption.getStyle('height').toInt();

			if(this.options.descriptions != false){extra += this.description.getStyle('height').toInt()}

			if(this.options.showControls){extra += this.controlDiv.getStyle('height').toInt()}

			if(this.options.showNumbers){extra += this.number.getStyle('height').toInt()}

			var num = (extra-(this.closeButton.getStyle('height').toInt()*2));

			if(num < 0){num=0}

			this.closeButton.setStyle('marginTop', num+'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.Out){

				this.fx.bottom.set(-this.bottom.offsetHeight);

				this.bottomContainer.style.height = '';

				this.fx.bottom.start(0);

				break;

			}

			this.bottomContainer.style.height = '';

		case 5:

			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);

		this.overlay.setStyles({height: this.window.height+'px', width: this.window.width+'px'});

		return false;

	}



};



/*************************************************************/