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

var autoClick = 0;	
var timer = "";

function rotatePromo() {				
				
	autoClick = 1;
	$("#nextBtnId").click();
	
	timer = setTimeout("rotatePromo()", 5000); // 5 sec
}

jQuery.fn.carousel = function(previous, next, options){
	var sliderList = jQuery(this).children()[0];
	
	if (this && sliderList) {
		var increment = jQuery(sliderList).children().outerWidth("true"),
		elmnts = jQuery(sliderList).children(),
		numElmts = elmnts.length,
		sizeFirstElmnt = increment,
		shownInViewport = Math.round(jQuery(this).width() / sizeFirstElmnt),
		firstElementOnViewPort = 1,
		isAnimating = false;
		
		for (i = 0; i < shownInViewport; i++) {
			jQuery(sliderList).css('width',(numElmts+shownInViewport)*increment + "px");
			jQuery(sliderList).append(jQuery(elmnts[i]).clone());
		}
		
		jQuery(previous).click(function(event){
			
			if (autoClick == 0) {
				 	
			 	if (timer != "")
					clearTimeout(timer);
					
				timer = setTimeout("rotatePromo()", 10000); // 10 sec
			 }
					
			autoClick = 0;
			
			if (!isAnimating) {
				if (firstElementOnViewPort == 1) {
					jQuery(sliderList).css('left', "-" + numElmts * sizeFirstElmnt + "px");
					firstElementOnViewPort = numElmts;
				}
				else {
					firstElementOnViewPort--;
				}
				
				jQuery(sliderList).animate({
					left: "+=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
			
		});
		
		jQuery(next).click(function(event){
			
			if (autoClick == 0) {
				 	
			 	if (timer != "")
					clearTimeout(timer);
					
				timer = setTimeout("rotatePromo()", 10000); // 10 sec
			 }
					
			autoClick = 0;
				
			if (!isAnimating) {
				if (firstElementOnViewPort > numElmts) {
					firstElementOnViewPort = 2;
					jQuery(sliderList).css('left', "0px");
				}
				else {
					firstElementOnViewPort++;
				}
				jQuery(sliderList).animate({
					left: "-=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
		});
	}
};