/**
 * @license 
 * jQuery Tools @VERSION / Scrollable Navigator
 * 
 * NO COPYRIGHTS OR LICENSES. DO WHAT YOU LIKE.
 *
 * http://flowplayer.org/tools/scrollable/navigator.html
 *
 * Since: September 2009
 * Date: @DATE 
 */
(function($) {

	var t = $.tools.scrollable; 

	t.navigator = {

		conf: {
			navi: '.navi',
			naviItem: null,		
			activeClass: 'active',
			indexed: false,
			idPrefix: null,

			// 1.2
			history: false
		}
	};		

	function find(root, query) {
		var el = $(query);
		return el.length < 2 ? el : root.parent().find(query);
	}

	// jQuery plugin implementation
	$.fn.navigator = function(conf) {

		// configuration
		if (typeof conf == 'string') { conf = {navi: conf}; } 
		conf = $.extend({}, t.navigator.conf, conf);

		var ret;

		this.each(function() {

			var api = $(this).data("scrollable"),
				 navi = conf.navi.jquery ? conf.navi : find(api.getRoot(), conf.navi), 
				 buttons = api.getNaviButtons(),
				 cls = conf.activeClass,
				 hashed = conf.history && !!history.pushState,
				 size = api.getConf().size;


			// @deprecated stuff
			if (api) { ret = api; }

			api.getNaviButtons = function() {
				return buttons.add(navi);	
			}; 


			if (hashed) {
				history.pushState({i: 0}, '');

				$(window).bind("popstate", function(evt) {
					var s = evt.originalEvent.state;
					if (s) { api.seekTo(s.i); }
				});					
			}

			function doClick(el, i, e) {
				api.seekTo(i);
				e.preventDefault(); 
				if (hashed) { history.pushState({i: i}, ''); }
			}

			function els() {
				return navi.find(conf.naviItem || '> *');	
			}

			function addItem(i) {  

				var item = $("<" + (conf.naviItem || 'a') + "/>").click(function(e)  {
					doClick($(this), i, e);					
				});

				// index number / id attribute
				if (i === 0) {  item.addClass(cls); }
				if (conf.indexed)  { item.text(i + 1); }
				if (conf.idPrefix) { item.attr("id", conf.idPrefix + i); }

				return item.appendTo(navi);
			}


			// generate navigator
			if (els().length) {
				els().each(function(i) { 
					$(this).click(function(e)  {
						doClick($(this), i, e);		
					});
				});

			} else {				
				$.each(api.getItems(), function(i) {
					if (i % size == 0) addItem(i); 
				});
			}   

			// activate correct entry
			api.onBeforeSeek(function(e, index) {
				setTimeout(function() {
					if (!e.isDefaultPrevented()) {	
						var i = index / size,
							 el = els().eq(i);

						if (el.length) { els().removeClass(cls).eq(i).addClass(cls); }
					}
				}, 1);
			}); 

			// new item being added
			api.onAddItem(function(e, item) {
				var i = api.getItems().index(item);
				if (i % size == 0) addItem(i);
			});

		});		

		return conf.api ? ret : this;

	};

})(jQuery);