/*
 * 	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
 *
 */
 
$(document).ready(function(){	
			$("#slider").easySlider({
				controlsBefore:	'<p id="controls">',
				controlsAfter:	'</p>',
				auto: true,
				speed: 2000
			});
});	

(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: 			1000,
			auto:			false,
			pause:			7000,
			continuous:		false
		}; 
		
		var options = $.extend(defaults, options);  
				
		this.each(function() { 
			var o_nowLast = 3;
			var nowLast = 3;
			var obj = $(this);
			var firstBackFlg;
			var li = $("li", obj).length;
			var scr_w = 234;
			var s = $("ul", obj).length;
			var w = $("ul", obj).width(); 
			var h = $("ul", obj).height(); 
			obj.width(w); 
			obj.height(h); 
			obj.css("overflow","hidden");
			var ts = s-1;
			var t = 0;
			$("div", obj).css('width',s*w);			
			if(!options.vertical) $("ul", 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);										
			};
			
			if(nowLast >= li){
				$("a","#"+options.nextId).hide();
				$("a","#"+options.lastId).hide();
			}
			
			$("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){
				var ot = t;
				
				if(o_nowLast >= li){
					return;
				}

				if(nowLast == li && !clicked){
					dir = "first";
					firstBackFlg = 1;
					ot = 1;
					//clearTimeout(timeout);
				}
				//alert(dir);
				switch(dir){
					case "next":
						nowLast += 3;
						t = (ot>=ts) ? (options.continuous ? 0 : ts) : t+1;						
						break; 
					case "prev":
						nowLast -= 3;
						t = (t<=0) ? (options.continuous ? ts : 0) : t-1;
						break; 
					case "first":
						nowLast = 3;
						t = 0;
						break; 
					case "last":
						nowLast = li;
						t = ts;
						break; 
					default:
						break; 
				};
				
				if(dir){
					if( nowLast < li ){
						if( nowLast % 3 ){
							nowLast += 3 - nowLast % 3;
						}
					}
				}
				
				var diff = Math.abs(ot-t);
				var speed = diff*options.speed;						
				if(!options.vertical) {
					p = (t*w*-1);
					if(nowLast > li){
						p += (nowLast - li) * scr_w;
						nowLast = li;
					}
					$("div",obj).animate(
						{ marginLeft: p }, 
						speed
					);				
				} else {
					p = (t*h*-1);
					$("div",obj).animate(
						{ marginTop: p }, 
						speed
					);
				};
				

				if(!options.continuous && options.controlsFade){
					if(t==ts || nowLast == li){
						$("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 && !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);