/*
 * 	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>
 *
 */
 
 /*
 *
 * Modified by Chris Barrow (27 July, 2009) for Unit Editions to allow multiple instances of the slider on one page
 *
 */ 

(function($) {

	$.fn.easySlider = function(options){
	  
		// default configuration properties
		var defaults = {			
			prevId: 		'prevBtn',
			prevText: 		'',
			nextId: 		'nextBtn',	
			nextText: 		'',
			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); 	
			// store vars in the object to keep them local to this instance
			obj.prevId = options.prevId + obj.attr('id');	
			obj.nextId = options.nextId + obj.attr('id');	
			obj.s = $("li", obj).length;
			/*
			obj.w = $("li", obj).width(); 
			obj.h = $("li", obj).height(); 
			*/
			obj.w = 475;
			obj.h = 320;
			
			obj.width(obj.w); 
			obj.height(obj.h); 
			obj.css("overflow","hidden");
			obj.ts = obj.s-1;
			obj.t = 0;
			/*$("ul", obj).css('width',obj.s*obj.w);			*/
			if(!options.vertical) $("li", obj).css('float','left');
			
			if(options.controlsShow){
				if (obj.s > 1){
					var html = options.controlsBefore;
					if(options.firstShow) html += '<span class="'+ options.firstId +'"><a href=\"javascript:void(0);\">'+ options.firstText +'</a></span>';
					html += ' <span id="'+ obj.prevId +'" class="'+ options.prevId +'"><a href=\"javascript:void(0);\">'+ options.prevText +'</a></span>';
					html += ' <span id="'+ obj.nextId +'" class="'+ options.nextId +'"><a href=\"javascript:void(0);\">'+ options.nextText +'</a></span>';
					if(options.lastShow) html += ' <span class="'+ options.lastId +'"><a href=\"javascript:void(0);\">'+ options.lastText +'</a></span>';
					html += options.controlsAfter;						
					$(obj).append(html);
				};
			};
	
			$("a","#"+obj.nextId).click(function(){
				animate("next",true);
			});
			$("a","#"+obj.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){
				var ot = obj.t;				
				switch(dir){
					case "next":
						obj.t = (ot>=obj.ts) ? (options.continuous ? 0 : obj.ts) : obj.t+1;						
						break; 
					case "prev":
						obj.t = (obj.t<=0) ? (options.continuous ? obj.ts : 0) : obj.t-1;
						break; 
					case "first":
						t = 0;
						break; 
					case "last":
						obj.t = obj.ts;
						break; 
					default:
						break; 
				};	
				
				var diff = Math.abs(ot-obj.t);
				var speed = diff*options.speed;				
				if(!options.vertical) {
					p = (obj.t*obj.w*-1);
					$("ul",obj).animate(
						{ marginLeft: p }, 
						speed
					);				
				} else {
					p = (obj.t*obj.h*-1);
					$("ul",obj).animate(
						{ marginTop: p }, 
						speed
					);					
				};
				
				if(!options.continuous && options.controlsFade){					
					if(obj.t==obj.ts){
						$("a","#"+obj.nextId).hide();
						$("a","."+options.lastId).hide();
					} else {
						$("a","#"+obj.nextId).show();
						$("a","."+options.lastId).show();					
					};
					if(obj.t==0){
						$("a","#"+obj.prevId).hide();
						$("a","."+options.firstId).hide();
					} else {
						$("a","#"+obj.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","#"+obj.prevId).hide();
				$("a","#"+obj.firstId).hide();				
			};				
			
		});
	  
	};

})(jQuery);