/*
 * 	Easy Slider 1.5 - jQuery plugin
 *	written by Alen Grakalic
 *	http://cssglobe.com/post/4004/easy-slider-15-the-easiest-jquery-plugin-for-sliding
 *
 *	Copyright (c) 2009 Alen Grakalic (http://cssglobe.com)
 *	Dual licensed under the MIT (MIT-LICENSE.txt)
 *	and GPL (GPL-LICENSE.txt) licenses.
 *
 *	Built for jQuery library
 *	http://jquery.com
 *
 */

/*
 *	markup example for $("#slider").easySlider();
 *
 * 	<div id="slider">
 *		<ul>
 *			<li><img src="images/01.jpg" alt="" /></li>
 *			<li><img src="images/02.jpg" alt="" /></li>
 *			<li><img src="images/03.jpg" alt="" /></li>
 *			<li><img src="images/04.jpg" alt="" /></li>
 *			<li><img src="images/05.jpg" alt="" /></li>
 *		</ul>
 *	</div>
 *
 */
(function($) {

	$.fn.easySlider = function(options){

		// default configuration properties
		var defaults = {
			prevId: 		'prevBtn',
			prevText: 		'Previous',
			nextId: 		'nextBtn',
			nextText: 		'Next',
			controlsShow:	false,
			controlsBefore:	'',
			controlsAfter:	'',
			controlsFade:	true,
			firstId: 		'firstBtn',
			firstText: 		'First',
			firstShow:		false,
			lastId: 		'lastBtn',
			lastText: 		'Last',
			lastShow:		false,
			vertical:		false,
			speed: 			800,
			auto:			true,
			pause:			5000,
			continuous:		true
		};

		var options = $.extend(defaults, options);

		this.each(function() {
			var obj = $(this);
			var s = $("li", obj).length;
			// vier abziehen, weil das erste und letzte Element nochmal angehaengt ist
			s = s - 4;
			var w = $("li", obj).width();
			var h = $("li", obj).height();
			obj.width(w);
			obj.height(h);
			var ts = s-1;
			var t = 0;

			if(options.controlsShow){
				var html = options.controlsBefore;
				if(options.firstShow) html += '<span id="'+ options.firstId +'"><a href=\"javascript:void(0);\">'+ options.firstText +'</a></span>';
				html += ' <span id="'+ options.prevId +'"><a href=\"javascript:void(0);\">'+ options.prevText +'</a></span>';
				html += ' <span id="'+ options.nextId +'"><a href=\"javascript:void(0);\">'+ options.nextText +'</a></span>';
				if(options.lastShow) html += ' <span id="'+ options.lastId +'"><a href=\"javascript:void(0);\">'+ options.lastText +'</a></span>';
				html += options.controlsAfter;
				$(obj).after(html);
			};

			$("a","#"+options.nextId).click(function(){
				animate("next",true);
			});
			$("a","#"+options.prevId).click(function(){
				animate("prev",true);
			});
			$("a","#"+options.firstId).click(function(){
				animate("first",true);
			});
			$("a","#"+options.lastId).click(function(){
				animate("last",true);
			});

			function animate(dir,clicked){
				var ot = t;
				switch(dir){
					case "next":
						if (t == (ts + 2))
						{
							t = 1;
						}
						t = (ot>=ts) ? (options.continuous ? t+1 : ts) : t+1;
						break;
					case "prev":
						t = (t<=0) ? (options.continuous ? ts : 1) : t-1;
						break;
					case "first":
						t = 0;
						break;
					case "last":
						t = ts;
						break;
					default:
						break;
				};

				var speed = options.speed;
				if(!options.vertical)
				{
					// unser Abstand bei Runners Point von einem Bild zum naechsten bzw margin-left
					iStartLeft = -1644;
					// Laenge des Slides
					w = 823;

					// beim letztes div auf den ersten springen, um ein rundes sliden zu ermoeglichen
					if (t == (s+1))
					{
						$("ul",obj)
			 	 	 	 .attr('style',
				 	 	     'margin-left:-1644px;');
						t = 1;
					}

					// beim rueckwaerts-sliden ganz nach hinten springen,
					// um einen sauberen Slide sehen zu koennen
					if (dir == 'prev' && t == (s-1))
					{
						iJumpMargin = (s+2) * w;
						$("ul",obj)
			 	 	 	 .attr('style',
				 	 	     'margin-left:-'+iJumpMargin+'px;');
					}

					// neue margin-left definieren zu der hingeslidet wird
					p = iStartLeft - (w*t);

					$("ul",obj).animate(
						{ marginLeft: p },
						speed
					);
				}
				else
				{
					p = (t*h*-1);
					$("ul",obj).animate(
						{ marginTop: p },
						speed
					);
				};

				if(!options.continuous && options.controlsFade){
					if(t==ts){
						$("a","#"+options.nextId).hide();
						$("a","#"+options.lastId).hide();
					} else {
						$("a","#"+options.nextId).show();
						$("a","#"+options.lastId).show();
					};
					if(t==0){
						$("a","#"+options.prevId).hide();
						$("a","#"+options.firstId).hide();
					} else {
						$("a","#"+options.prevId).show();
						$("a","#"+options.firstId).show();
					};
				};

				if(clicked)
				{
					clearTimeout(timeout);
					$("#controls").hide();
					$("#controls").show(options.speed);
				}

				// automatisches vor- und zurueckblattern
				if(options.auto && dir=="next" && !clicked){
					$("#controls").hide();
					timeout = setTimeout(function(){
						animate("next",false);
					},options.speed+options.pause);
					$("#controls").show(options.speed);
				};

			};
			// init
			var timeout;
			if(options.auto)
			{;
				timeout = setTimeout(function(){
					animate("next",false);
				},options.pause);
			};

			if(!options.continuous && options.controlsFade){
				$("a","#"+options.prevId).hide();
				$("a","#"+options.firstId).hide();
			};

		});

	};

})(jQuery);