/**
 * @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 (numElmts <= 0) {
            $('#previous_temp').css('display', 'block');
            $('#next_temp').css('display', 'block');
            $('#scrollcontrol').css('display', 'none');
            return;
        }
            if (numElmts > 6) {
            $('#previous').css('display', 'block');
            $('#next').css('display', 'block');


            for (i = 0; i < shownInViewport; i++) {
                jQuery(sliderList).css('width', (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('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 (!isAnimating) {
                    if (firstElementOnViewPort > numElmts) {
                        firstElementOnViewPort = 1;
                        jQuery(sliderList).css('left', "0px");
                    }
                    else {
                        firstElementOnViewPort++;
                    }
                    jQuery(sliderList).animate({
                        left: "-=" + increment,
                        y: 0,
                        queue: true
                    }, "swing", function() { isAnimating = false; });
                    isAnimating = true;
                }
            });


        }
    }
};