/*
 * 	Easy Slider 1.7 - 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: 			1000,
			auto:			true,
			pause:			5000,
			continuous:		true, 
			numeric: 		false,
			numericId: 		'controls'
		}; 
		
			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 clickable = 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.continuous){
					$("ul", obj).prepend($("ul li:last-child", obj).clone().css("margin-left","-"+ w +"px"));
					$("ul", obj).append($("ul li:nth-child(2)", obj).clone());
					$("ul", obj).css('width',(s+1)*w);
				};				

				if(!options.vertical) $("li", obj).css('float','left');

				if(options.controlsShow){
					var html = options.controlsBefore;				
					if(options.numeric){
						html += '<ol id="'+ options.numericId +'"></ol>';
					} else {
						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);										
				};

				if(options.numeric){									
					for(var i=0;i<s;i++){						
						$(document.createElement("li"))
							.attr('id',options.numericId + (i+1))
							.html('<a rel='+ i +' href=\"javascript:void(0);\">'+ (i+1) +'</a>')
							.appendTo($("#"+ options.numericId))
							.click(function(){							
								animate($("a",$(this)).attr('rel'),true);
							}); 												
					};							
				} else {
					$("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 setCurrent(i){
					i = parseInt(i)+1;
					$("li", "#" + options.numericId).removeClass("current");
					$("li#" + options.numericId + i).addClass("current");
				};

				function adjust(){
					if(t>ts) t=0;		
					if(t<0) t=ts;	
					if(!options.vertical) {
						$("ul",obj).css("margin-left",(t*w*-1));
					} else {
						$("ul",obj).css("margin-left",(t*h*-1));
					}
					clickable = true;
					if(options.numeric) setCurrent(t);
				};

				function animate(dir,clicked){
					if (clickable){
						clickable = false;
						var ot = t;				
						switch(dir){
							case "next":
								t = (ot>=ts) ? (options.continuous ? t+1 : ts) : t+1;						
								break; 
							case "prev":
								t = (t<=0) ? (options.continuous ? t-1 : 0) : t-1;
								break; 
							case "first":
								t = 0;
								break; 
							case "last":
								t = ts;
								break; 
							default:
								t = dir;
								break; 
						};	
						var diff = Math.abs(ot-t);
						var speed = diff*options.speed;						
						if(!options.vertical) {
							p = (t*w*-1);
							$("ul",obj).animate(
								{ marginLeft: p }, 
								{ queue:false, duration:speed, complete:adjust }
							);				
						} else {
							p = (t*h*-1);
							$("ul",obj).animate(
								{ marginTop: p }, 
								{ queue:false, duration:speed, complete:adjust }
							);					
						};

						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.numeric) setCurrent(0);

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

			});

		};

	})(jQuery);