//TODO carousel přepsat do ExtJs
$(document).ready(function() {
	$('.infiniteCarousel').infiniteCarousel();
});

$.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) {
				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;
				});

				return false;
			}

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

			// 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);
			});

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