/*
 * 	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: 		'Precedente',
			nextId: 		'nextBtn',	
			nextText: 		'Prossima',
			controlsShow:	true,
			controlsBefore:	'',
			controlsAfter:	'',	
			controlsFade:	true,
			firstId: 		'firstBtn',
			firstText: 		'Prima',
			firstShow:		false,
			lastId: 		'lastBtn',	
			lastText: 		'Ultima',
			lastShow:		false,				
			vertical:		false,
			speed: 			800,
			auto:			false,
			pause:			2000,
			continuous:		true
		}; 
		
		var options = $.extend(defaults, options);  
				
		this.each(function() 
		{  
			var obj = $(this); 				
			var s = $("li", obj).length;
			var w = $("li", obj).width(); 
			var h = $("li", obj).height(); 
			obj.width(w); 
			obj.height(h); 
			obj.css("overflow","hidden");
			var ts = s-1;
			var t = 0;
			$("ul", obj).css('width',s*w);			
			if (!options.vertical) $("li", obj).css('float','left');
			
			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);\" title=\"Indietro\">' + options.prevText + '</a></span>';
				html += ' <span id="'+ options.nextId + '"><a href=\"javascript:void(0);\" title=\"Avanti\">' + 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":
						t = (ot >= ts) ? (options.continuous ? 0 : ts) : t + 1;
						break;
					case "prev":
						t = (t <= 0) ? (options.continuous ? ts : 0) : t - 1;
						break;
					case "first":
						t = 0;
						break; 
					case "last":
						t = ts;
						break; 
					default:
						break; 
				};	
				
				var diff = Math.abs(ot - t);
				var speed = diff * options.speed;						
				if (!options.vertical) 
				{
					p = (t * w * -1);
					$("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);
				if (options.auto && dir == "next" && !clicked)
				{;
					timeout = setTimeout(function() { animate("next",false); }, diff * options.speed + options.pause);
				};
				
			};
			
			// 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);