/*
 * 	Slider - jQuery plugin
 *	written by Marco Scortegagna
 *	Copyright (c) 2009
 *
 *	Built for jQuery library
 *	http://jquery.com
 */
 
/*
 *	markup example for $("#images").easySlider();
 *	
 * 	<div id="images">
 *		<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){
	  
		// Configurazione di default
		var defaults = {
			prevId: 		'prevBtn',
			prevText: 		'Previous',
			nextId: 		'nextBtn',	
			nextText: 		'Next',
			orientation:	'', //  'vertical' is optional;
			speed: 			800,
			current: 		0,
			widthWindow:	100,
			sizeWindow:		1,
			hideButton:		true,
			showButton:		false
		}; 
		
		var options = $.extend(defaults, options);  
		
		return this.each(function() {  
			obj = $(this); 				
			var s = $("li", obj).length;
			var widthSlide = options.widthWindow;
			var w = obj.width(); 
			var h = obj.height(); 
			var ts = s-1;
			var t = options.current;
			var vertical = (options.orientation == 'vertical');
			$("ul", obj).css('width',s*w);			
			if(!vertical) $("li", obj).css('float','left');
			
			if (options.showButton) {
				$(obj).after('<span id="'+ options.prevId +'"><a href=\"javascript:void(0);\">'+ options.prevText +'</a></span> <span id="'+ options.nextId +'"><a href=\"javascript:void(0);\">'+ options.nextText +'</a></span>');
			}
			
			if (ts < options.sizeWindow) {
				if (options.hideButton) {
					$("a#"+options.prevId).hide();
					$("a#"+options.nextId).hide();
				}
			}
			
			$("a#"+options.nextId).click(function(){		
				animate("next");
				if (!options.hideButton) {
					if (t>=ts) $(this).fadeOut();
					$("a#"+options.prevId).fadeIn();
				}
			});
			$("a#"+options.prevId).click(function(){		
				animate("prev");
				if (!options.hideButton) {
					if (t<=0) $(this).fadeOut();
					$("a#"+options.nextId).fadeIn();
				}
			});
			
			// Carico l'eventuale posizione di partenza per lo slide
			if (options.current > 0) { t = options.current; animate(); }

			function animate(dir){
				if(dir == "next"){
					//alert(t + options.sizeWindow);
					//alert(ts);
					//if (t >= options.sizeWindow)
					  t = (t + options.sizeWindow >= ts) ? (ts - options.sizeWindow + 1) : t+1;
				} else if (dir == "prev") {
					t = (t<=0) ? 0 : t-1;
				};
				if(!vertical) {
					p = (t*widthSlide*-1);
					$("ul",obj).animate(
						{ marginLeft: p }, 
						options.speed
					);				
				} else {
					p = (t*h*-1);
					$("ul",obj).animate(
						{ marginTop: p }, 
						options.speed
					);					
				}
			};
			if(s>1) $("a","#"+options.nextId).fadeIn();	
		});
	};

})(jQuery);