/// <reference path="jquery-1.4.1-vsdoc.js" />


$.fn.infiniteCarousel = function () {

    function repeat(str, num) {
        return new Array(num + 1).join(str);
    }

    return this.each(function () {
        var $wrapper = $('> div', this).css('overflow', 'hidden'),
            $slider = $wrapper.find('> ul'),
            $items = $slider.find('> li'),
            $single = $items.filter(':first'),

            singleWidth = $single.outerWidth(),
            visible = Math.ceil($wrapper.innerWidth() / singleWidth), // note: doesn't include padding or border
            currentPage = 1,
            pages = Math.ceil($items.length / visible);


        // 1. Pad so that 'visible' number will always be seen, otherwise create empty items
        if (($items.length % visible) != 0) {
            $slider.append(repeat('<li class="empty" />', visible - ($items.length % visible)));
            $items = $slider.find('> li');
        }

        // 2. Top and tail the list with 'visible' number of items, top has the last section, and tail has the first
        $items.filter(':first').before($items.slice(-visible).clone().addClass('cloned'));
        $items.filter(':last').after($items.slice(0, visible).clone().addClass('cloned'));
        $items = $slider.find('> li'); // reselect

        // 3. Set the left position to the first 'real' item
        $wrapper.scrollLeft(singleWidth * visible);

        // 4. paging function
        function gotoPage(page) {
            //alert(page);
            var dir = page < currentPage ? -1 : 1,
                n = Math.abs(currentPage - page),
                left = singleWidth * dir * visible * n;

            $wrapper.filter(':not(:animated)').animate({
                scrollLeft: '+=' + left
            }, 1000, function () {
                if (page == 0) {
                    $wrapper.scrollLeft(singleWidth * visible * pages);
                    page = pages;
                } else if (page > pages) {
                    $wrapper.scrollLeft(singleWidth * visible);
                    // reset back to start position
                    page = 1;
                }

                currentPage = page;
                //                alert(currrentPage);
            });

            return false;
        }

        var animated = true;
        var timer = 0;

        function stopAnimation() {
            if (timer > 0 && animated) {
                window.clearTimeout(timer);
                animated = false;
            }
        }

        function nextPage() {
            if (!animated) {
                return;
            }
            gotoPage(parseInt(currentPage) + 1);
        }

        $wrapper.after('<a class="arrow back"></a><a class="arrow forward"></a>');

        // 5. Bind to the forward and back buttons
        $('a.back', this).click(function () {
            stopAnimation();
            return gotoPage(parseInt(currentPage) - 1);
        });

        $('a.forward', this).click(function () {
            stopAnimation();
            return gotoPage(parseInt(currentPage) + 1);
        });

        // create a public interface to move to a specific page
        $(this).bind('goto', function (event, page) {
            gotoPage(page);
        });

        $("#carouselThumbnails li").click(function () {
            stopAnimation();
            var stringId = $(this).attr("Id");
            var thumbID = stringId.substring(stringId.lastIndexOf("_") + 1);

            gotoPage(parseInt(thumbID));
        });


        function doanimate() {
            timer = window.setInterval(nextPage, 4000);
        }

        doanimate();
    });



};