/*
 * 	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 = {
			columns:		1,			
			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:			false,
			pause:			2000,
			continuous:		false, 
			numeric: 		false,
			numericId: 		'controls',
			autoDelay:		2000
		}; 
		
		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*options.columns-10); 
			obj.height(h); 
			obj.css("overflow","hidden");
			var ts = s-options.columns;
			if (ts<0){
				ts=0;
			}
			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);
			};				
			
			
			// dumt hack for at skjule overskriften for internet explorer 7 der ikke kan finde ud af position:relative kombineret med overflow:clip
			$("ul li:nth-child(" + (options.columns+1) + ") a div div", obj).fadeOut(1); //css('visibility', 'hidden');
			for (i=options.columns+1; i <= s ; i++){
				$("ul li:nth-child(" + (i) + ") a div div", obj).fadeOut(1)
			}
			
			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;
							
							$("ul li:nth-child(" + (t+options.columns) + ") a div div", obj).fadeIn(2000); //css('visibility', 'visible');
							$("ul li:nth-child(" + (t) + ") a div div", obj).fadeOut(200); //css('visibility', 'hidden');
			
							break; 
						case "prev":
							t = (t<=0) ? (options.continuous ? t-1 : 0) : t-1;
							$("ul li:nth-child(" + (t+options.columns+1) + ") a div div", obj).fadeOut(200); //css('visibility', 'hidden');
							$("ul li:nth-child(" + (t+1) + ") a div div", obj).fadeIn(2000); //css('visibility', 'visible');
			
							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){
						var fadeTime=500;			
						if((t==ts)||(ts < 1)) {
							
							$("a","#"+options.nextId).fadeOut(fadeTime);
							$("a","#"+options.lastId).fadeOut(fadeTime);
						} else {
							$("a","#"+options.nextId).fadeOut(1);
							$("a","#"+options.nextId).css('visibility', 'visible');
							$("a","#"+options.nextId).fadeIn(fadeTime);
							$("a","#"+options.lastId).css('visibility', 'visible');
							$("a","#"+options.lastId).fadeIn(fadeTime);					
						};
						if(t==0){
							$("a","#"+options.prevId).fadeOut(fadeTime);
							$("a","#"+options.firstId).fadeOut(fadeTime);
						} else {
							$("a","#"+options.prevId).css('visibility', 'visible');
							$("a","#"+options.prevId).fadeIn(fadeTime);
							$("a","#"+options.firstId).css('visibility', 'visible');
							$("a","#"+options.firstId).fadeIn(fadeTime);
						};					
					};				
					
					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.autoDelay);
			};		
			
			if(options.numeric) setCurrent(0);
		
			if(!options.continuous && options.controlsFade){
						var fadeTime=500;			
						if((t==ts)||(ts < 1)) {						
							$("a","#"+options.nextId).fadeOut(fadeTime);
							$("a","#"+options.lastId).fadeOut(fadeTime);
						} else {
							$("a","#"+options.nextId).css('visibility', 'visible');
							$("a","#"+options.nextId).fadeIn(fadeTime);
							$("a","#"+options.lastId).css('visibility', 'visible');
							$("a","#"+options.lastId).fadeIn(fadeTime);						
						};
						if(t==0){
							$("a","#"+options.prevId).fadeOut(fadeTime);
							$("a","#"+options.firstId).fadeOut(fadeTime);
						} else {
							$("a","#"+options.prevId).css('visibility', 'visible');
							$("a","#"+options.prevId).fadeIn(fadeTime);
							$("a","#"+options.firstId).css('visibility', 'visible');
							$("a","#"+options.firstId).fadeIn(fadeTime);
						};					
					};			
			
		});
	  
	};

})(jQuery);