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


jQuery.fn.carousel = function(previous, next, options){
	var sliderList = jQuery(this).children()[0];
	
	if (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;
		
		if (firstElementOnViewPort == 1) {
			$("#previous").css('background', 'none');
		} 
		if (numElmts <= 3) {
			$("#next").css('background', 'none');
		}
		if(numElmts > 3) {
			firstElementOnViewPort = 4;
		}
		
		/*for (i = 0; i < shownInViewport; i++) {
			jQuery(sliderList).append(jQuery(elmnts[i]).clone());
		}*/
		
		jQuery(previous).click(function(event){
			if (!isAnimating) {
				if (firstElementOnViewPort == 4) {
					return false;
					jQuery(sliderList).css('left', "-" + numElmts * sizeFirstElmnt + "px");
					firstElementOnViewPort = numElmts;
				}
				else {
					$("#next").css('background', 'url(arquivos_carrosel/fleche-carrousel-droite.png) no-repeat scroll left top transparent');
					firstElementOnViewPort--;
				}
				
				if (firstElementOnViewPort == 4) {
					$("#previous").css('background', 'none');
				}
				jQuery(sliderList).animate({
					left: "+=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
			
		});
		
		jQuery(next).click(function(event){
			if (!isAnimating) {
				if (firstElementOnViewPort > numElmts) {
					return false;
					firstElementOnViewPort = 2;
					jQuery(sliderList).css('left', "0px");
				} else {
					$("#previous").css('background', 'url(arquivos_carrosel/fleche-carrousel-gauche.png) right center no-repeat');
					firstElementOnViewPort++;
				}
				if (firstElementOnViewPort > numElmts) {
					$("#next").css('background', 'none');
				}
				
				jQuery(sliderList).animate({
					left: "-=" + increment,
					y: 0,
					queue: true
				}, "swing", function(){isAnimating = false;});
				isAnimating = true;
			}
		});
	}
};