// JavaScript Document

$.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'),
			$this = $(this);
            
            singleWidth = $single.outerWidth(),			 
            visible = Math.ceil($wrapper.innerWidth() / singleWidth), // note: doesn't include padding or border
            currentPage = 1,
			pages = 0;
			pages = Math.ceil($items.length / visible);
			
			$(this).data('currentPage', currentPage);
			
//			if ($items.length <= visible){
//            	pages = Math.ceil($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');
//		        }				
//			}
//			else{
//				pages = $items.length;				
//			}


        // 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) {
            var dir = page < currentPage ? -1 : 1,
                n = Math.abs(currentPage - page),
                left = singleWidth * dir * visible * n;
				//left = singleWidth * dir;
				
            $wrapper.filter(':not(:animated)').animate({
                scrollLeft : '+=' + left
            }, 500, 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;
	            $this.data('currentPage', page);
				$this.trigger('gotoFinished');
            });                
            
            return false;
        }
        
        $wrapper.after('<a class="arrow back"></a><a class="arrow forward"></a>');
        if (pages > 1)
		{
	        // 5. Bind to the forward and back buttons
	        $('a.back', this).click(function () {
	            return gotoPage(currentPage - 1);                
	        });
	        
	        $('a.forward', this).click(function () {
	            return gotoPage(currentPage + 1);
	        });			
		}
		else
		{
			$('a.back', this).css('visibility', 'hidden');
			$('a.forward', this).css('visibility', 'hidden');
		}
        
        // create a public interface to move to a specific page
        $(this).bind('goto', function (event, page) {
            gotoPage(page);
        });
        $(this).bind('prev', function (event) {
			if (currentPage === 1)
	            gotoPage(pages);
			else
				gotoPage(currentPage - 1);			
        });
        $(this).bind('next', function (event) {
			if (currentPage === pages)
	            gotoPage(1);
			else
				gotoPage(currentPage + 1);			
        });
    });  
};