/**
 * @author Stéphane Roucheray 
 * @extends jquery
 */


jQuery.fn.carousel = function(previous, next, options){
	var sliderList = jQuery(this).children()[0];
	
	if (sliderList) {
		
		sliderListitem = jQuery(sliderList); 
		
		increment = sliderListitem.css("height")/*250*/,
		elmnts = 1/*jQuery(sliderList).children()*/,
		numElmts = 1/*elmnts.length*/,
		//sizeFirstElmnt = increment,
		//sizeFirstElmnt = (jQuery(sliderList).children()[0].outerHeight("true")*jQuery(sliderList).children().length)/3, 
		sizeFirstElmnt = (235 * jQuery('#slideshow ul').length)/3,
		shownInViewport = 1, //Math.round(jQuery(this).width() / sizeFirstElmnt),
		firstElementOnViewPort = 1,
		isAnimating = false;
		
		for (i = 0; i < shownInViewport; i++) {
			//jQuery(sliderList).css('width',(numElmts+shownInViewport)*increment + increment + "px");
			//jQuery(sliderList).css('height',(numElmts+shownInViewport)*increment + increment + "px");
			//jQuery(sliderList).append(jQuery(elmnts[i]).clone());
		}
		
		jQuery(previous).click(function(event){
			if (!isAnimating) {
				if (firstElementOnViewPort == 1) {
					jQuery(sliderList).css('top', "-" + numElmts * sizeFirstElmnt + "px");
					//jQuery(sliderList).css('top', "0px");
					firstElementOnViewPort = numElmts;
				}
				else {
					//firstElementOnViewPort--;
					//jQuery(sliderList).css('top', "0px");
					
				}
				
				jQuery(sliderList).animate({
					top: "+=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
			
		});
		
		jQuery(next).click(function(event){
			var el = jQuery(sliderList).children()[0];
			var maxTop = jQuery(el).outerHeight() * (jQuery(sliderList).children().length / 3);
			var item = jQuery(sliderList).children()[0];
			increment = jQuery(item).outerHeight();
			var actualTop = Math.abs(parseInt(jQuery(sliderList).css('top')));
			if (!isAnimating) {
				if((actualTop+increment) >= maxTop) {
					jQuery(sliderList).css('top', '0px');
					increment = 0;
				}
				jQuery(sliderList).animate({
					top: "-=" + increment,
					x: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
		});
	}
};