var SlideShow = new Class({
	
	Implements: [Options, Events, Loop],
		
		options: {
			delay: 7000,
			transition: 'fade',
			duration: '500',
			autoplay: false
		},
	
	initialize: function(element, options){
		this.setOptions(options);
		this.setLoop(this.showNext, this.options.delay);
		this.element = $(element);
		this.slides = this.element.getChildren();
		this.current = this.slides[0];
		this.setup();
		if(this.options.autoplay) this.startLoop();
	},
	
	setup: function(){
	  this.setupElement();
	  this.setupSlides();
		return this;
	},
	
	setupElement: function(){
		var el = this.element;
		return this;
	},
	
	setupSlides: function(){
		this.slides.each(function(slide, index){
			this.storeTransition(slide).reset(slide);
			if(index != 0) slide.setStyle('display','none');
		}, this);
		return this;
	},
	
	storeTransition: function(slide){
		var classes = slide.get('class');
		var transitionRegex = /transition:[a-zA-Z]+/;
		var durationRegex = /duration:[0-9]+/;
		var transition = (classes.match(transitionRegex)) ? classes.match(transitionRegex)[0].split(':')[1] : this.options.transition;
		var duration = (classes.match(durationRegex)) ? classes.match(durationRegex)[0].split(':')[1] : this.options.duration;
		slide.store('ssTransition', transition);
		slide.store('ssDuration', duration);
		return this;
	},
	
	getTransition: function(slide){
		return slide.retrieve('ssTransition');
	},
	
	getDuration: function(slide){
		return slide.retrieve('ssDuration');
	},
	
	show: function(slide){
		this.fireEvent('show');
		slide = (typeof slide == 'number') ? this.slides[slide] : slide;
		
		if(slide != this.current){
			var transition = this.getTransition(slide);
			var duration = this.getDuration(slide);
			var previous = this.current.setStyle('z-index', 1);
			var next = this.reset(slide);
			this.transitions[transition](previous, next, duration, this);
			(function() { 
				/*previous.setStyle('display','none');*/
				this.fireEvent('showComplete');
			}).bind(this).delay(duration);
			this.current = next;
		}
		return this;
	},
	
	reset: function(slide){
		return slide.setStyles({
			'position': 'absolute',
			'z-index': 0,
			'display': 'block',
			'left': 0,
			'top': 0
		}).fade('show');
		return this;
	},
	
	nextSlide: function(){
		var next = this.current.getNext();
		return (next) ? next : this.slides[0];
	},
	
	showNext: function(){
		this.show(this.nextSlide());
		return this;
	}	
});

SlideShow.adders = {
	
	transitions:{},
	
	add: function(className, fn){
		this.transitions[className] = fn;
		this.implement({
			transitions: this.transitions
		});
	},
	
	addAllThese : function(transitions){
		$A(transitions).each(function(transition){
			this.add(transition[0], transition[1]);
		}, this);
	}
	
}

$extend(SlideShow, SlideShow.adders);
SlideShow.implement(SlideShow.adders);

SlideShow.add('fade', function(previous, next, duration, instance){
	previous.set('tween',{duration: duration}).fade('out');
	next.set('tween',{duration: duration}).fade('in');
	return this;
});