/**
 * Name: jquery.infinite-carousel.js
 * Description: Infinite Carousel Plugin
 * Version: 1.1
 * Coder: Remy Sharp
 * Coder URI: http://jqueryfordesigners.com/
 * Additional modifications by Enrique Ramírez
*/

$.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
        $items.addClass('item');
        
        // 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;
            
            $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;
            });                
            
			// Bullet Point Modification
			$("ul.bullet-points li").removeClass('active');
            var current_bullet = page;
            if(page > bullet_needle) {
				current_bullet = 1;
			} else if(page == 0) {
            	current_bullet = bullet_needle;
			}
			$("a.goto-slide[rel='slide-"+current_bullet+"']").parent().addClass('active');

            return false;
        }
        
        $wrapper.after('<a class="arrow-left"></a><a class="arrow-right"></a>');
        
        // 5. Bind to the forward and back buttons
        $('.arrow-left', this).click(function () {
            return gotoPage(currentPage - 1);
        });
        
        $('.arrow-right', this).click(function () {
            return gotoPage(currentPage + 1);
        });
        
        // create a public interface to move to a specific page
        $(this).bind('goto', function (event, page) {
            gotoPage(page);
        });
        
        // Calculate number of bullet points
  		var totalElements = $("#slideshow ul li[class='item']").length;
  		var bullet_needle = Math.ceil(totalElements/1);
  		var i = 1;

  		// Generate bullet points
  		$(this).append('<ul class="bullet-points"></ul>');
  		for(i=1;i<=bullet_needle;i++){
  			$("ul.bullet-points").append('<li><a class="goto-slide" href="#" rel="slide-'+i+'">'+i+'</a></li>');
  		}
		$("ul.bullet-points li:first-child").addClass("active");
		
  		// Bind the Click action
		$('a.goto-slide').click(function (e) {
			e.preventDefault();
			$("ul.bullet-points li").removeClass('active');
			$(this).parent().addClass('active');
			var page = $(this).attr('rel');
			page = page.split('-');
			page = parseInt(page[1]);	
			gotoPage(page);                
		});
    });  
};