/**
 * @author Stéphane Roucheray 
 * @extends $
 */


$.fn.carousel = function(previous, next, options){
	var sliderList = $(this).children()[0];
	
	if (sliderList) {
		var increment = $(sliderList).children().outerWidth("true"),
		elmnts = $(sliderList).children(),
		numElmts = elmnts.length,
		sizeFirstElmnt = increment,
		shownInViewport = Math.round($(this).width() / sizeFirstElmnt),
		firstElementOnViewPort = 1,
		isAnimating = false;
		
		for (i = 0; i < shownInViewport; i++) {
			$(sliderList).css('width',(numElmts+shownInViewport)*increment + increment + "px");
			$(sliderList).append($(elmnts[i]).clone());
		}
		
		$(previous).click(function(event){
			if (!isAnimating) {
				if (firstElementOnViewPort == 1) {
					$(sliderList).css('left', "-" + numElmts * sizeFirstElmnt + "px");
					firstElementOnViewPort = numElmts;
				}
				else {
					firstElementOnViewPort--;
				}
				
				$(sliderList).animate({
					left: "+=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
			
		});
		
		$(next).click(function(event){
			if (!isAnimating) {
				if (firstElementOnViewPort > numElmts) {
					firstElementOnViewPort = 2;
					$(sliderList).css('left', "0px");
				}
				else {
					firstElementOnViewPort++;
				}
				$(sliderList).animate({
					left: "-=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
		});
	}
};