var Popup = new Class({
	
	Implements: [Options, Events],
	
	options: {
		/*
		onLoad
		onShow: $empty,
		onHide: $empty,
		onTransition: $empty,
		onCancel: $empty,
		multipleChildren: false,
		hideWhenEmpty: false,
		*/
		chainChildren: true
	},
	
	/*
	visible: false,
	*/
	children: [],
	
	initialize: function(element, options){
		this.element = $(element);
		if (options && options.holder){
			options.holder.addChild(this);
			delete options.holder;
		}
		this.setOptions(options);
	},
	
	addChild: function(child){
		child.holder = this;
		this.children.include(child);
	},
	
	show: function(){
		if (this.holder)
			if (!this.holder.shown)
				this.holder.show();
			else if (!this.holder.options.multipleChildren) {
				var th = this;
				this.holder.children.each(function(c){if(c != th) c._hide();});
			}
		if (this.visible) {
			this.call(this.onTransition.bind(this, arguments));
		} else {
			this.visible = true;
			this.call(this.onShow.bind(this, arguments));
		}
	},

	hide: function(){
		if (this.holder && this.holder.visible && this.holder.options.hideWhenEmpty){
			var cs = this.holder.children;
			for(var i=0;i<cs.length;i++)
				if (cs[i].visible && cs[i] != this){
					this._hide();
					return;
				}
			this.holder.hide();
			return;
		}
		this._hide();
	},
	
	_hide: function(){
		if (this.visible){
			this.children.each(function(c){ c._hide(); });
			this.visible = false;
			this.call(this.onHide);
		}
	},

	$next: $empty,
	
	requestQueue: function(p){
		if (this.holder)
			this.holder.requestQueue(p);
		else if (this.running){
			(this.$queue = (this.$queue || []).erase(p)).push(p);
		} else {
			this.running = true;
			p.callNext();
		}
	},
		
	nextInQueue: function(){
		if (this.holder)
			this.holder.nextInQueue();
		else if (this.$queue && this.$queue.length > 0)
			this.$queue.shift().callNext();
		else
			this.running = false;
	},
	
	call: function(f){
		//this.cancel();
		this.$next = f;
		this.requestQueue(this);
	},
	
	callNext: function(){
		this.running = true;
		this.$next.apply(this);
		this.$next = $empty;
	},
	
	cancel: function(){
		if (this.running){
			this.running = false;
			this.$next = false;
			if (this.$queue) this.$queue.empty();
			this.children.each(function(c){c.cancel();});
		}
	},
	
	complete: function(){
		this.running = false;
		this.nextInQueue();
	},
	
	onShow: function(){ return this.fireEvent('onShow', arguments); },
	
	onHide: function(){ return this.fireEvent('onHide', arguments); },
	
	onTransition: function(){ return this.fireEvent('onTransition', arguments); },
	
	onCancel: function(){ return this.fireEvent('onCancel', arguments); }
});

Popup.Overlay = new Class({
	
	Extends: Popup,
	
	options: {
		/*
		parentElement: false,
		className: null,
		fx: { },
		*/
		styles: {
			position: 'absolute',
			width: '100%',
			height: '100%',
			top: '0',
			left: '0',
			backgroundColor: '#000000'
		},
		showStyle: {opacity: .8},
		hideStyle: {opacity: 0},
		hideWhenEmpty: true
	},
	
	initialize: function(options){
		if (options){
			if (options.showStyle) this.options.showStyle = options.showStyle;
			if (options.hideStyle) this.options.hideStyle = options.hideStyle;
			this.setOptions(options);
		}
		var fix = Browser.Engine.trident5 || Browser.Engine.gecko || Browser.Engine.webkit || Browser.Engine.presto;

		var pe = $(this.options.parentElement) || $(document.body);
		var element = new Element('div', {
			'styles': {
				position: fix ? 'fixed' : 'absolute',
				display: 'none',
				visibility: 'visible',
				width: '100%',
				height: '100%',
				overflow: 'hidden',
				top: 0,
				left: 0,
				margin: 0,
				padding: 0,
				border: 0,
				zIndex: 1000
			}
		}).inject(pe);
		
		this.bg = new Element('div', {
			'class': this.options.className,
			'styles': this.options.styles,
			'events': { click: this.hide.bind(this) }
		}).inject(element);
		this.morph = new Fx.Morph(this.bg, $merge(this.options.fx, { link: 'cancel', onComplete: this.complete.bind(this) }));
		this.morph.set(this.options.hideStyle);

		arguments.callee.parent(element, options);

		if (!fix){
			(pe.get('tag') == 'body' ? window : pe).addEvent('scroll', this.posFix.bind(this, pe)).addEvent('resize', this.posFix.bind(this, pe));
			this.posFix(pe);
		}
	},
	
	posFix: function(pe){
		var p = pe.getScroll(), s = pe.getSize();
		this.element.set('styles', {top: p.y, left: p.x, height: s.y + 'px', width: s.x + 'px'});
	},
	
	onShow: function(){
		this.element.setStyle('display', 'block');
		this.morph.start(this.options.showStyle);
		arguments.callee.parent.apply(this, arguments);
	},
	
	onHide: function(){
		this.morph.start(this.options.hideStyle).chain(function(){
			this.element.setStyle('display', 'none');
		}.bind(this));
		arguments.callee.parent.apply(this, arguments);
	},
	
	onTransition: function(){
		this.complete();
		arguments.callee.parent.apply(this, arguments);
	},
	
	onCancel: function(){
		this.morph.cancel();
		arguments.callee.parent.apply(this, arguments);
	}

});

Popup.Lightbox = new Class({
	
	Extends: Popup,
	
	options: {
		elementFx: { duration: 300 },
		contentFx: { duration: 500 }
	},
	/*
	content: $empty,
	image: $empty,
	title: $empty,
	*/
	images: [],
	titles: new Hash(),
	current: $empty,
	
	initialize: function(element, options){
		if($type(element) == 'object') options = element;
		var e = this.element = $(element) || new Element('div', { 'class': 'Lightbox', html: '<div class="Content"><div class="Image"><a class="Next" href="javascript:void(0);"></a><a class="Previous" href="javascript:void(0);"></a></div><div class="Bottom"><a class="Close" href="javascript:void(0);"></a><div class="Title"></div></div></div>' });
		if(options){
			if (options.elementFx) this.options.elementFx = options.elementFx;
			if (options.contentFx) this.options.contentFx = options.contentFx;
			this.setOptions(options);
		}
		e.set('tabindex', -1);
		this.elementFx = new Fx.Morph(e, $merge(this.options.elementFx, {link: 'cancel'}));
		this.elementFx.set({'opacity': 0});
		var s = e.setStyle;
		e.setStyle = function() { s.apply(this, arguments); var z = this.getSize(); s.apply(s.apply(this, ['marginTop', -(z.y/2)]), ['marginLeft', -(z.x/2)]); };
		
		this.content = e.getElement('.Content');
		this.contentFx = new Fx.Morph(this.content, $merge(this.options.contentFx, {link: 'cancel'}));
		this.contentFx.set({'opacity': 0});
		
		this.image = e.getElement('.Image');
		var actions = new Hash({'.Next': this.next, '.Previous': this.previous, '.Close': this.hide})
		var t = this;
		actions.each(function(fn, k){
			var a = e.getElement(k);
			if(a) a.addEvent('click', function(e) { e.preventDefault(); fn.apply(t, arguments); });
		});
		this.title = e.getElement('.Title');
		
		this.element.addEvent('keyup', this.keyboardListener.bindWithEvent(this));
		
		arguments.callee.parent(this.element, options);
	},
	
	onShow: function(url, title){
		if(this.holder)
			this.holder.element.adopt(this.element);
		else
			this.element.inject(document.body);
			
		this.element.addClass('LightboxLoading');

		this.current = url;
		if($defined(title)) this.titles.set(url, title);
		
		var loaded = false;
		var img = new Asset.image(url, {onload: function(){ this.element.removeClass('LightboxLoading'); if(this.elementFx.timer || this.contentFx.timer) loaded = true; else this.animation(img); }.bind(this)});
		
		this.elementFx.start({'opacity': 1}).chain(function(){
			if(loaded)
				this.animation(img);
		}.bind(this));
	},
	
	onHide: function(){
		this.elementFx.start({'opacity': 0}).chain(function(){
			this.contentFx.set({'opacity': 0});
			this.element.dispose();
			this.complete();
		}.bind(this));
	},
	
	onTransition: function(url){
		this.contentFx.start({'opacity': 0}).chain(
			this.onShow.bind(this, arguments)
		);
	},
	
	onCancel: function(){
		this.elementFx.cancel();
		this.contentFx.cancel();
	},
	
	animation: function(img){
		this.image.setStyles({'backgroundImage': 'url(' + img.src + ')', width: img.width, height: img.height});
		if (this.title) this.title.set('html', this.titles.get(img.src));
		var w = img.width;
		this.elementFx.start({'width': w}).chain(function(){
			var h = this.content.getScrollHeight();
			this.elementFx.start({'height': h}).chain(function(){
				this.contentFx.start({'opacity': 1}).chain(function(){
					this.element.focus();
					this.complete();
				}.bind(this));
			}.bind(this));
		}.bind(this));
	},
	
	add: function(url, title){
		this.images.include(url);
		this.titles.set(url, title);
		return this;
	},
	
	next: function(){
		var i = this.images.indexOf(this.current);
		i = (i >= this.images.length-1) ? 0 : i+1;
		return this.show(this.current = this.images[i]);
	}, 
	
	previous: function(){
		var i = this.images.indexOf(this.current);
		i = (i <= 0) ? this.images.length-1 : i-1;
		return this.show(this.current = this.images[i]);
	},
		
	keyboardListener: function(e){
		switch (e.key){
			case 'esc': case 'backspace': case 'delete': this.hide(); break;
			case 'left': case 'down': this.previous(); break;	
			case 'right': case 'up': this.next();
		}
	}
});