/*
Script: Lightbox.js
	A lightbox clone for MooTools.

* Christophe Beyls (http://www.digitalia.be); MIT-style license.
* Inspired by the original Lightbox v2 by Lokesh Dhakar: http://www.huddletogether.com/projects/lightbox2/.
* Refactored by Aaron Newton 

*/
var Lightbox = new Class({
	Implements: [Options, Events],
	options: {
//	anchors: null,
		resizeDuration: 400,
//	resizeTransition: false,	// default transition
		initialWidth: 250,
		initialHeight: 250,
		zIndex: 5000,
		animateCaption: true,
		showCounter: true,
		autoScanLinks: true,
		relString: 'lightbox',
		overlayStyles: {
			opacity: 0.8
		}
//	onImageShow: $empty,
//	onDisplay: $empty,
//	onHide: $empty
	},

	initialize: function(options){
		this.setOptions(options);
		this.anchors = this.options.anchors || arguments[1];
		if (this.options.autoScanLinks && !this.anchors) {
			this.anchors = [];
			$$('a[rel^='+this.options.relString+']').each(function(el){
				if(!el.retrieve('lightbox')) this.anchors.push(el);
			}, this);
		}
		if(!$$(this.anchors).length) return; //no links!
		this.addAnchors(this.anchors);
		this.init();
	},
	
	init: function(){
		if(this.options.useDefaultCss) this.addCss();
		this.eventKeyDown = this.keyboardListener.bind(this);
		this.eventPosition = this.position.bind(this);
		window.addEvent('domready', this.addHtmlElements.bind(this));
		return this;
	},
	
	addAnchors: function(anchors){
		$$(anchors).each(function(el){
			if(!el.retrieve('lightbox')) {
				el.store('lightbox', this);
				el.addEvent('click', function(e){
					e.stop();
					this.click(el);
				}.bind(this));
			}
		}.bind(this));
	},

	addHtmlElements: function(){
		this.overlay = new Element('div', {
			'class': 'lbOverlay',
			styles: {
				zIndex:this.options.zIndex
			}
		});
		this.overlay.inject(document.body).setStyles(this.options.overlayStyles);
		this.center = new Element('div', {
			styles: {	
				width: this.options.initialWidth, 
				height: this.options.initialHeight, 
				marginLeft: (-(this.options.initialWidth/2)),
				display: 'none',
				zIndex:this.options.zIndex+1
			}
		}).inject(document.body).addClass('lbCenter');
		this.image = new Element('div', {
			'class': 'lbImage'
		}).inject(this.center);
		
		this.prevLink = new Element('a', {
			'class': 'lbPrevLink', 
			href: 'javascript:void(0);', 
			styles: {'display': 'none'}
		}).inject(this.image);
		this.nextLink = this.prevLink.clone().removeClass('lbPrevLink').addClass('lbNextLink').inject(this.image);
		this.prevLink.addEvent('click', this.previous.bind(this));
		this.nextLink.addEvent('click', this.next.bind(this));

		this.bottomContainer = new Element('div', {
			'class': 'lbBottomContainer', 
			styles: {
				display: 'none', 
				zIndex:this.options.zIndex+1
		}}).inject(document.body);
		this.bottom = new Element('div', {'class': 'lbBottom'}).inject(this.bottomContainer);
		new Element('a', {
			'class': 'lbCloseLink', 
			href: 'javascript:void(0);'
		}).inject(this.center).addEvent('click', this.close.bind(this));
		this.overlay.addEvent('click', this.close.bind(this));
		this.caption = new Element('div', {'class': 'lbCaption'}).inject(this.bottom);
		this.number = new Element('div', {'class': 'lbNumber'}).inject(this.bottom);
		new Element('div', {'styles': {'clear': 'both'}}).inject(this.bottom);
		var nextEffect = this.nextEffect.bind(this);
		this.fx = {
			overlay: new Fx.Tween(this.overlay, {property: 'opacity', duration: 500}).set(0),
			resize: new Fx.Morph(this.center, $extend({
				duration: this.options.resizeDuration, 
				onComplete: nextEffect}, 
				this.options.resizeTransition ? {transition: this.options.resizeTransition} : {})),
			image: new Fx.Tween(this.image, {property: 'opacity', duration: 500, onComplete: nextEffect}),
			bottom: new Fx.Tween(this.bottom, {property: 'margin-top', duration: 400, onComplete: nextEffect})
		};

		this.preloadPrev = new Element('img');
		this.preloadNext = new Element('img');
	},
	
	addCss: function(){
		window.addEvent('domready', function(){
			if($('LightboxCss')) return;
			new Element('link', {
				rel: 'stylesheet', 
				media: 'screen', 
				type: 'text/css', 
				href: this.options.assetBaseUrl + 'slimbox.css',
				id: 'LightboxCss'
			}).inject(document.head);
		}.bind(this));
	},

	click: function(link){
		link = $(link);
		var rel = link.get('rel')||this.options.relString;
		if (rel == this.options.relString) return this.show(link.get('href'), link.get('title'));

		var j, imageNum, images = [];
		this.anchors.each(function(el){
			if (el.get('rel') == link.get('rel')){
				for (j = 0; j < images.length; j++) if(images[j][0] == el.get('href')) break;
				if (j == images.length){
					images.push([el.get('href'), el.get('title')]);
					if (el.get('href') == link.get('href')) imageNum = j;
				}
			}
		}, this);
		return this.open(images, imageNum);
	},

	show: function(url, title){
		return this.open([[url, title]], 0);
	},

	open: function(images, imageNum){
		this.fireEvent('onDisplay');
		this.images = images;
		this.position();
		this.setup(true);
		this.top = (window.getScroll().y + (window.getSize().y / 15)).toInt();
		this.center.setStyles({
			top: this.top,
			display: ''
		});
		this.fx.overlay.start(this.options.overlayStyles.opacity);
		return this.changeImage(imageNum);
	},

	position: function(){
		this.overlay.setStyles({
			'top': window.getScroll().y, 
			'height': window.getSize().y
		});
	},

	setup: function(open){
		var elements = $$('object, iframe');
		elements.extend($$(Browser.Engine.trident ? 'select' : 'embed'));
		elements.each(function(el){
			el=$(el);
			try {
			
			if (open && typeof el.getStyle != undefined && typeof el.store != undefined)
				el.store('lbBackupStyle', el.getStyle('visibility'));
			
			var vis = (open ? 'hidden' : el.retrieve('lbBackupStyle'));
			el.setStyle('visibility', vis);
			
			}
			catch(err){
			var vis = (open ? 'hidden' : 'visible');
			el.style.visibility = vis;
			}
		});
		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.code){
			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){
		this.fireEvent('onImageShow', [imageNum, this.images[imageNum]]);
		if (this.step || (imageNum < 0) || (imageNum >= this.images.length)) return false;
		this.step = 1;
		this.activeImage = imageNum;

		this.center.setStyle('backgroundColor', '');
		this.bottomContainer.setStyle('display', 'none');
		this.prevLink.setStyle('display', 'none');
		this.nextLink.setStyle('display', 'none');
		this.fx.image.set(0);
		this.center.addClass('lbLoading');
		this.preload = new Element('img', {
			events: {
				load: function(){
					this.nextEffect.delay(100, this)
				}.bind(this)
			}
		});
		this.preload.set('src', this.images[imageNum][0]);
		return false;
	},

	nextEffect: function(){
		switch (this.step++){
		case 1:
			this.image.setStyle('backgroundImage', 'url('+this.images[this.activeImage][0]+')');
			this.image.setStyle('width', this.preload.width);
			this.bottom.setStyle('width',this.preload.width);
			this.image.setStyle('height', this.preload.height);
			this.prevLink.setStyle('height', this.preload.height+100);
			this.nextLink.setStyle('height', this.preload.height+100);

			this.caption.set('html',this.images[this.activeImage][1] || '');
			this.number.set('html',(!this.options.showCounter || (this.images.length == 1)) ? '' : bbr_lb_img+' '+(this.activeImage+1)+' '+bbr_lb_of+' '+this.images.length);

			if (this.activeImage) $(this.preloadPrev).set('src', this.images[this.activeImage-1][0]);
			if (this.activeImage != (this.images.length - 1)) 
				$(this.preloadNext).set('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.getSize().y), 
				height: 0, 
				marginLeft: this.center.getStyle('margin-left'), 
				display: ''
			});
			this.fx.image.start(1);
			break;
		case 4:
			this.center.style.backgroundColor = '#000';
			if (this.options.animateCaption){
				this.fx.bottom.set(-this.bottom.offsetHeight);
				this.bottomContainer.setStyle('height', '');
				this.fx.bottom.start(0);
				break;
			}
			this.bottomContainer.style.height = '';
		case 5:
			if (this.activeImage) this.prevLink.setStyle('display', '');
			if (this.activeImage != (this.images.length - 1)) this.nextLink.setStyle('display', '');
			this.step = 0;
		}
	},

	close: function(){
		this.fireEvent('onHide');
		if (this.step < 0) return;
		this.step = -1;
		if (this.preload) this.preload.destroy();
		for (var f in this.fx) this.fx[f].cancel();
		this.center.setStyle('display', 'none');
		this.bottomContainer.setStyle('display', 'none');
		this.fx.overlay.chain(this.setup.pass(false, this)).start(0);
		return;
	}
});
window.addEvent('domready', function(){if($(document.body).get('html').match(/rel=?.lightbox/i)) new Lightbox()});