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,
            auto:               false,
            frequency:          3,
            visibleSlides:      1,
            controlClassName:   'carousel-control',
            jumperClassName:    'carousel-jumper',
            disabledClassName:  'carousel-disabled',
            selectedClassName:  'carousel-selected',
            circular:           false,
            wheel:              true,
            effect:             'scroll',
            transition:         'sinoidal',
			resumeAutoAfterClick: 0
        }, options || {});
        
        if (this.options.effect == 'fade') {
            this.options.circular = true;
        }

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

		if (this.controls) {
            this.controls.invoke('observe', 'click', this.click.bind(this));
        }
        
        if (this.options.wheel) {            
            this.scroller.observe('mousewheel', this.wheel.bindAsEventListener(this)).observe('DOMMouseScroll', this.wheel.bindAsEventListener(this));;
        }

        if (this.options.auto) {
            this.start();
        }

		if (this.options.initial) {
			var initialIndex = this.slides.indexOf($(this.options.initial));
			if (initialIndex > (this.options.visibleSlides - 1) && this.options.visibleSlides > 1) {               
				if (initialIndex > this.slides.length - (this.options.visibleSlides + 1)) {
					initialIndex = this.slides.length - this.options.visibleSlides;
				}
			}
            this.moveTo(this.slides[initialIndex]);
		}
	},

	click: function (event) {
		this.stop();

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

		if (!element.hasClassName(this.options.disabledClassName)) {
			if (element.hasClassName(this.options.controlClassName)) {
				eval("this." + element.rel + "()");
            } else if (element.hasClassName(this.options.jumperClassName)) {
                this.moveTo(element.rel);
                if (this.options.selectedClassName) {
                    this.controls.invoke('removeClassName', this.options.selectedClassName);
                    element.addClassName(this.options.selectedClassName);
                }
            }
        }
		
		if (this.options.resumeAutoAfterClick && this.options.auto) {
			clearTimeout(this.afterClickTimer);
			this.afterClickTimer = setTimeout(this.start.bind(this), this.options.resumeAutoAfterClick * 1000);
		}

		this.deactivateControls();

		event.stop();
    },

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

		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();
		}

        switch (this.options.effect) {
            case 'fade':               
                this.scrolling = new Effect.Opacity(this.scroller, {
                    from:   1.0,
                    to:     0,
                    duration: this.options.duration,
                    afterFinish: (function () {
                        this.scroller.scrollLeft = elementOffset[0] - scrollerOffset[0];
                        this.scroller.scrollTop  = elementOffset[1] - scrollerOffset[1];

                        new Effect.Opacity(this.scroller, {
                            from: 0,
                            to: 1.0,
                            duration: this.options.duration,
                            afterFinish: (function () {
                                if (this.controls) {
                                    this.activateControls();
                                }
                                if (this.options.afterMove && (typeof this.options.afterMove == 'function')) {
                                    this.options.afterMove();
                                }
                            }).bind(this)
                        });
                    }
                ).bind(this)});
            break;
            case 'scroll':
            default:
                var transition;
                switch (this.options.transition) {
                    case 'spring':
                        transition = Effect.Transitions.spring;
                        break;
                    case 'sinoidal':
                    default:
                        transition = Effect.Transitions.sinoidal;
                        break;
                }

                this.scrolling = new Effect.SmoothScroll(this.scroller, {
                    duration: this.options.duration,
                    x: (elementOffset[0] - scrollerOffset[0]),
                    y: (elementOffset[1] - scrollerOffset[1]),
                    transition: transition,
                    afterFinish: (function () {
                        if (this.controls) {
                            this.activateControls();
                        }
                        if (this.options.afterMove && (typeof this.options.afterMove == 'function')) {
                            this.options.afterMove();
                        }                        
                        this.scrolling = false;
                    }).bind(this)});
            break;
        }

		return false;
	},

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

		if (prevIndex == (this.slides.length - 1) && this.options.circular && this.options.effect != 'fade') {
			this.scroller.scrollLeft =  (this.slides.length - 1) * this.slides.first().getWidth();
			this.scroller.scrollTop =  (this.slides.length - 1) * this.slides.first().getHeight();
			prevIndex = this.slides.length - 2;
        }

		this.moveTo(this.slides[prevIndex]);
	},

	next: function () {
		if (this.current) {
			var currentIndex = this.current._index;
			var nextIndex = (this.slides.length - 1 == currentIndex) ? (this.options.circular ? 0 : currentIndex) : currentIndex + 1;
        } else {
            var nextIndex = 1;
        }

		if (nextIndex == 0 && this.options.circular && this.options.effect != 'fade') {
			this.scroller.scrollLeft = 0;
			this.scroller.scrollTop  = 0;
			nextIndex = 1;
        }

		if (nextIndex > this.slides.length - (this.options.visibleSlides + 1)) {
			nextIndex = this.slides.length - this.options.visibleSlides;
		}		

		this.moveTo(this.slides[nextIndex]);
	},

	first: function () {
		this.moveTo(this.slides[0]);
    },

	last: function () {
		this.moveTo(this.slides[this.slides.length - 1]);
    },

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

	stop: function () {
		if (this.timer) {
			clearTimeout(this.timer);
		}
	},

	start: function () { 
        this.periodicallyUpdate();
    },

	pause: function () {
		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);
    },
    
    wheel: function (event) {
        event.cancelBubble = true;
        if(event.stop) { event.stop(); }
        
		var delta = 0;
		if (!event) {
            event = window.event;
        }
		if (event.wheelDelta) {
			delta = event.wheelDelta / 120; 
		} else if (event.detail) { 
            delta = -event.detail / 3;	
        }        
       
        if (!this.scrolling) {
            this.deactivateControls();
            if (delta > 0) {
                this.prev();
            } else {
                this.next();
            }            
        }
        
		return Math.round(delta); //Safari Round
    },

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

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


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;
    }
});