Carousel = Class.create(Abstract, {

	initialize: function (scroller, slides, controls, options) {

		this.scrolling	= false;
		this.scroller	= scroller;
		this.slides		= slides;
		this.controls	= controls;

		this.options    = Object.extend({ duration: 1.0, frequency: 10, controlClassName: 'carousel-control', jumperClassName: 'carousel-jumper' }, options || {});

		this.slides.each(function(slide, index) {
			slide._index = index; 
			});

		if (this.controls) {
			this.controls.invoke('observe', 'click', this.click.bind(this));
			}

		if (this.options.auto) {
			this.start();
			this.slides.invoke('observe', 'mouseover', this.pause.bind(this));
			this.slides.invoke('observe', 'mouseout', this.resume.bind(this));
			}

		},
	
	click: function (event) {

		this.stop();

		var element = event.findElement('a');

		if (!element.hasClassName('disabled')) {
			this.deactivateControls();
			if (element.hasClassName(this.options.controlClassName)) {
				eval("this." + element.rel + "()");
				} else if (element.hasClassName(this.options.jumperClassName)) {
					this.moveTo(element, element.rel);
					}
			}

		event.stop();

		},

	moveTo: function (trigger, element) {

		if (this.options.beforeMove && (typeof this.options.beforeMove == 'function')) {
			this.options.beforeMove();
			}

		if (this.controls && this.options.selectedClassName) {
			this.controls.each((function (elm) { elm.removeClassName(this.options.selectedClassName); }).bind(this));
			trigger.addClassName(this.options.selectedClassName);
			}

		this.previous= this.current ? this.current : this.slides[0];
		this.current = $(element);

		var scrollerOffset = this.scroller.cumulativeOffset();
		var elementOffset = this.current.cumulativeOffset();
		
		if (this.scrolling) {
			this.scrolling.cancel();
			}
		
		this.scrolling = new Effect.SmoothScroll(this.scroller, {
				duration: this.options.duration, 
				x: (elementOffset[0] - scrollerOffset[0]), 
				y: (elementOffset[1] - scrollerOffset[1]), 
				queue: {position: 'end', limit: 1, scope: this.scroller.id}, 
				afterFinish: (function () { 
					if (this.controls) {
						this.activateControls(); 
						}
					}).bind(this)});

		if (this.options.afterMove && (typeof this.options.afterMove == 'function')) {
			this.options.afterMove();
			}

		return false;

		},

	prev: function () {
		if (this.current) {
			var currentIndex = this.current._index;
			var prevIndex = (currentIndex == 0) ? this.slides.length - 1 : currentIndex - 1;
			} else { 
				var prevIndex = this.slides.length - 1;
				}

		this.moveTo(this.controls ? this.controls[prevIndex] : false, this.slides[prevIndex]);
		},		

	next: function () {
		if (this.current) {
			var currentIndex = this.current._index;
			var nextIndex = (this.slides.length - 1 == currentIndex) ? 0 : currentIndex + 1;      
			} else {
				var nextIndex = 1;
				}
		
		this.moveTo(this.controls ? this.controls[nextIndex] : false, this.slides[nextIndex]);
		},

	first: function () {
		var firstIndex = 0;
		if (this.current) {
			var currentIndex = this.current._index;
			}

		this.moveTo(this.controls[firstIndex], this.slides[firstIndex]);	
		},

	last: function () {
		var lastIndex = (this.slides.length - 1);
		if (this.current) {
			var currentIndex = this.current._index;
			}

		this.moveTo(this.controls[lastIndex], this.slides[lastIndex]);
		},
	
	toggle: function () {
		if (this.previous) {
			this.moveTo(this.controls[this.previous._index], this.slides[this.previous._index]);
			} else {
				return false;
				}
		},

	stop: function () { clearTimeout(this.timer); },
	
	start: function () { this.periodicallyUpdate(); },
		
	pause: function (event) {
		this.stop();
		this.activateControls();
		},

	resume: function (event) {
		if (event) {
			var related = event.relatedTarget || event.toElement;	
			if (!related || (!this.slides.include(related) && !this.slides.any(function (slide) { return related.descendantOf(slide); }))) {
				this.start();
				}
			} else {
				this.start();
				}
		},
	
	periodicallyUpdate: function () {
		if (this.timer != null) {
			clearTimeout(this.timer);
			this.next();
			}
		this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency * 1000);
		},

	deactivateControls: function () {
		this.controls.invoke('addClassName', 'disabled');
		},

	activateControls: function () {
		this.controls.invoke('removeClassName', 'disabled');
		}
	
	});

Effect.SmoothScroll = Class.create();

Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {

	initialize: function (element) {
		this.element = $(element);
		var options = Object.extend({ x: 0, y: 0, mode: 'absolute' } , arguments[1] || {});
		this.start(options);
		},

	setup: function () {
		if (this.options.continuous && !this.element._ext ) {
			this.element.cleanWhitespace();
			this.element._ext = true;
			this.element.appendChild(this.element.firstChild);
			}
   
		this.originalLeft = this.element.scrollLeft;
		this.originalTop = this.element.scrollTop;

		if (this.options.mode == 'absolute') {
			this.options.x -= this.originalLeft;
			this.options.y -= this.originalTop;
			}
		},

	update: function (position) {   
		this.element.scrollLeft = this.options.x * position + this.originalLeft;
		this.element.scrollTop  = this.options.y * position + this.originalTop;
		}

	});