/*
Copyright (c) 2009 Victor Stanciu - http://www.victorstanciu.ro

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
*/

/*

Modifiziert (Heiko Sippel, Dezember 2010)

1. Browserweiche für Internet-Explorer 6
2. Das Skript arbeitet jetzt als echtes "Karussell", d.h. es laueft recht und links durch als unendliches Band.
   Dazu wird der Inhalt des Karussells beim Startup verdoppelt. 
   Die "Fade-Option" wurde komplett entfernt, da sie keinen Sinn mehr macht.
*/

Carousel = Class.create(Abstract, {
	initialize: function (scroller, slides, controls, options) {
		this.scrolling	= false;
		this.scroller	= $(scroller);
		this.slides	= slides;
		this.controls	= controls;
		this.length 	= this.slides.length;
		this.extendSlider();
		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:              false,
		    effect:             'scroll',
		    transition:         'sinoidal'

		}, 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]);
	       }
	},

	// Extend the original DOM tree, effectively "doubling" the slider element (Heiko Sippel)
	extendSlider: function(){
		var container = this.scroller.down();
		var content = container.childElements();
	
		for(var i = 0; i < this.length;i++){
			clone = this.deepCopy(content[i]);
			container.insert(clone);
			this.slides[this.length + i] = clone;
		}
	},

	// Erzeugt eine deep copy eines Elements (Heiko Sippel)

	deepCopy: function(element){

		var clone = element.clone();
		var children = element.childElements();
		if(children.size() == 0){
			if(element.innerHTML.length > 0){
				clone.update(element.innerHTML);
			}
		}	
		else{
			for(var i = 0; i < children.size();i++){
				var child = this.deepCopy(children[i]);
				clone.insert(child);
			}
		}
		return clone;
	},

	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);
               			 }
            		}
       		 }
	
		this.deactivateControls();

		event.stop();
    },

	// Fuer den Explorer 6.0 (Heiko Sippel)
	jumpTo: function(newOffset) {
		this.scroller.setStyle({
			margin: '0px 0px 0px ' + newOffset + 'px'
		});

	},

	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();
		};


	// Browser-Weiche (Explorer 6.0 Heiko Sippel)

	
	agent = navigator.userAgent.toLowerCase();  
	if(agent.indexOf('msie 6') > -1){
		this.jumpTo( - (elementOffset[0] - scrollerOffset[0]));
		return false;
	}


        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)});

		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);
        }

		prevIndex %= this.length;

		if (prevIndex == 0 && this.options.circular && this.options.effect != 'fade') {
			this.scroller.scrollLeft =  (this.length +1) * this.slides.first().getWidth();
			this.scroller.scrollTop =  (this.length ) * this.slides.first().getHeight();
			prevIndex = this.length;

        }


		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;
        }
		nextIndex %= this.length +1;


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

		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;
        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;

    }
});