/*
 * 	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
 *
 
 		Heavily modified by the Department of Web Communications - Colorado State University
 */
 
/*
 *	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:	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, 
			numeric: 		false,
			numericId: 		'controls',
			ease:'easeInOutQuad',
			speedAdd:false,
			cycleNumber:false,
      orientation: 'horizontal'               // 'vertical', 'fade', or anything else will assume horizontal
		}; 
		

		var options = $.extend(defaults, options);  
		
		if(options.orientation=='fade'){
			options.continuous=true;
		}
		//alert(options.orientation);

		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;
			var l = 0;
			$("ul", obj).css('width',s*w);			
			
			if(options.continuous){
				//alert("continuous");
				if(options.orientation=='horizontal'){
					$("ul", obj).prepend($("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);
				} else if (options.orientation=='vertical'){
					$("ul", obj).prepend($("ul li:last-child", obj).clone().css("margin-bottom","-"+ h +"px"));
					$("ul", obj).append($("ul li:nth-child(2)", obj).clone());
					$("ul", obj).css('height',(s+1)*h);
				}
			};				
			
			if(options.orientation=='horizontal') $("li", obj).css('float','left');
			
			// Fade - Hide all but the first slide so they can fadeIn from nothing
      if (options.orientation == 'fade') {
				$("ul",obj).find("li").css({'position':'absolute','top':'0px','left':'0px','z-index':'3'});
				$("ul",obj).find("li:not(:first)").css({'display':'block','opacity':'1','z-index':'1'});
      }
								
			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(){
				l = (t*1);
				if(t>ts) t=0;		
				if(t<0) t=ts;	
				if(options.orientation=='horizontal') {
					$("ul",obj).css("margin-left",(t*w*-1));
				} else if(options.orientation=='vertical') {
					$("ul",obj).css("margin-top",(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;						
							if(ot>=ts){
									if(options.continuous){
										if(options.orientation=='fade'){
											t = 0;
										}else{
											t = t+1;
										}
									}else{
										t=ts
									}
							}else{
								t=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;
					if(options.speedAdd){
						var speed = diff*options.speed;							
					} else {
						var speed = options.speed;							
					}
					var ease = options.ease;
					if(options.orientation == 'horizontal') {
						p = (t*w*-1);
						$("ul",obj).animate(
							{ marginLeft: p }, 
							{ queue:false, duration:speed, easing:ease, complete:adjust }
						);				
					} else if(options.orientation == 'vertical') {
						p = (t*h*-1);
						$("ul",obj).animate(
							{ marginTop: p }, 
							{ queue:false, duration:speed, easing:ease, complete:adjust }
						);					
					} else {
						var curli = 'li:eq(' + l + ')';
						var nexli = 'li:eq(' + t + ')';
						//*/
						if(l!=t){
							$("ul",obj).find(nexli).css({'opacity':'1','z-index':'2'});
							$("ul",obj).find(curli).animate(
								{ opacity: 0}, 
								{ queue:false, duration:speed, complete:function(){
										$("ul",obj).find(curli).css('z-index', '1');
										$("ul",obj).find(nexli).css({'display':'block','z-index':'3','opacity':'1'});
										//alert(ts+":"+t+":"+l);
										adjust();
									}
								}
							);
						}else{
							//alert('already on this slide');
							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){;
						if(options.cycleNumber){
								if(cycle < options.cycleNumber){
								
								if((s-1) == l){
									//alert('cycle');
									cycle++;
								}
								if(cycle != options.cycleNumber){
									timeout = setTimeout(function(){
										animate("next",false);
									},diff*options.speed+options.pause);									
								} else {
									//alert('cleartimeout');
									clearTimeout(timeout);
								}
							} else {
								clearTimeout(timeout);
								alert('cycle over');
							}
						} else {
							timeout = setTimeout(function(){
								animate("next",false);
							},diff*options.speed+options.pause);	
						}
					};
			
				};
				
			};
			// init
			var timeout;
			var cycle=0;
			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);