/*
 * 	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 $("#slider").easySlider();
 *	
 * 	<div id="slider">
 *		<ul>
 *			<li><img src="images/01.jpg" alt="" /></li>
 *			<li><img src="images/02.jpg" alt="" /></li>
 *			<li><img src="images/03.jpg" alt="" /></li>
 *			<li><img src="images/04.jpg" alt="" /></li>
 *			<li><img src="images/05.jpg" alt="" /></li>
 *		</ul>
 *	</div>
 *
 */
//TODO: Make this slider wrap around continuously
(function($) {

	$.fn.easySlider = function(options){
	  
		// default configuration properties
		var defaults = {			
			prevId: 		'prevBtn',
			prevText: 		'Previous',
			nextId: 		'nextBtn',	
			nextText: 		'Next',
			controlsShow:	true,
			controlsBefore:	'',
			controlsAfter:	'',	
			controlsFade:	true,
			firstId: 		'firstBtn',
			firstText: 		'First',
			firstShow:		false,
			lastId: 		'lastBtn',	
			lastText: 		'Last',
			lastShow:		false,				
			vertical:		false,
			speed: 			800,
			auto:			false,
			pause:			2000,
			continuous:		false
		}; 
		
		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();
			var isAnimating = false;
			var doFirst = true;
			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);\">'+ 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){
				if (doFirst) {
					doFirst = false;
					p = 0;
					if (dir == "prev") {
						var lastListItem = $("ul li:nth-child(" + s + ")",obj);
						var elementHTML = $(lastListItem).html();
						p -= w;
						$("ul",obj).css("marginLeft", p);
						$("ul",obj).prepend("<li style='float: left;'>" + elementHTML + "</li>");
						$(lastListItem).remove();
						t += 1;
					}
				}
				if (!isAnimating) {
					isAnimating = true;
					var ot = t;				
					switch(dir){
						case "next":
							t = t+1;						
							break; 
						case "prev":
							t = 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) {
					
						//Take the last element and shove it at the beginning
						if (dir == "prev") {
							var lastListItem = $("ul li:nth-child(" + s + ")",obj);
							var elementHTML = $(lastListItem).html();
							p -= w;
							$("ul",obj).css("marginLeft", p);
							$("ul",obj).prepend("<li style='float: left;'>" + elementHTML + "</li>");
							$(lastListItem).remove();
							t += 1;
						}
						
						p = (t*w*-1);
						$("ul",obj).animate(
							{ marginLeft: p }, 
							speed, 
							"",
							function() {
								isAnimating = false;
								//Take first element and stick it at the end
								if (dir == "next") {
									var firstListItem = $("ul li:nth-child(1)",obj);
									var elementHTML = $(firstListItem).html();
									$("ul",obj).append("<li style='float: left;'>" + elementHTML + "</li>");
									p += w;
									$("ul",obj).css("marginLeft", p);
									$(firstListItem).remove();
									t -= 1;
								}
							}
						);	
							
						

						
					} 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);