/*
 * 	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 $("div.galleryCases").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.casesSlider = 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: 			500,
			auto:			false,
			pause:			2000,
			continuous:		false, 
			numeric: 		false,
			numericId: 		'controls'
		}; 
		
		var options = $.extend(defaults, options);  
		var mg = 0;
		var t = 0;
		
		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);
			var list_width = 30000;
			$("ul", obj).css('width',list_width);
			
			jQuery.easing.def = "easeInOutExpo";
			
			$("ul li", obj).css("opacity", "0.2");
			$("ul li", obj).css("margin-bottom", "-3px");
			$("ul li:nth-child(1)", obj).css("opacity", "1").addClass("in_view");
			$("ul li:nth-child(2)", obj).addClass("next_in_view");
			
			var widthScreen = document.body.offsetWidth;
			var posInicial = $("ul li.in_view", obj).position().left
			var widthInicial = $("ul li.in_view img", obj).width()
			var position = (widthScreen/2) - (posInicial + (widthInicial/2))
			$("ul", obj).css('margin-left', position)
			
			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>';
					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 {
				$(".bts_cases #"+options.nextId).click(function(){		
					animate("next",true);
				});
				$(".bts_cases #"+options.prevId).click(function(){		
					animate("prev",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){
				//var t =  $("li.in_view").index("div.galleryCases li");
				var ot = t;				
				switch(dir){
					case "next":
						t = (ot>=ts) ? (options.continuous ? 0 : ts) : t+1;
						break; 
					case "prev":
						t = (t<=0) ? (options.continuous ? ts : 0) : t-1;
						break; 
					case "first":
						t = 0;
						break; 
					case "last":
						t = ts;
						break; 
					default:
						break; 
				};
				
				var diff = Math.abs(ot-t);
				var speed = diff*options.speed;
					
				if(dir == "next")
					{ x=t; y=x+1; z=0;
						var widthScreen = document.body.offsetWidth;
						var posFirst = $("ul li:first-child", obj).position().left
						var posNext = $("ul li.next_in_view", obj).position().left
						var widthNext = $("ul li.next_in_view img", obj).width()
						var widthNextFirst = posNext - posFirst
						var position = (widthScreen/2) - (widthNextFirst + (widthNext/2))
						mg = position
					
					}
				else
					{ x=ot; y=x; z=1
					
						var widthScreen = document.body.offsetWidth;
						var posFirst = $("ul li:first-child", obj).position().left
						var widthPrev = $("ul li.prev_in_view img", obj).width()
						var widthActual = $("ul li.in_view img", obj).width()
						var widthPrevActual = (widthPrev/2)+(widthActual/2)
						var position = posFirst + widthPrevActual
						mg = position
						
					};
								
				if(x<=ts && x>0)
				{
					//mg = mg + (((($("ul li:nth-child("+ x +")", obj).width()) / 2) + (($("ul li:nth-child("+ (y+z) +")", obj).width()) / 2) + 10)*(ot-t));
									
					$("ul",obj).animate(
						{ marginLeft: mg }, speed
					);
					
					if($("ul li:nth-child("+ y +")", obj).hasClass("in_view") == false){
						$("ul li.in_view", obj).removeClass("in_view").animate({opacity:0.2},{duration:500});
						$("ul li.prev_in_view", obj).removeClass("prev_in_view");
						$("ul li.next_in_view", obj).removeClass("next_in_view");
						$("ul li:nth-child("+ y +")", obj).addClass("in_view").animate({opacity:1},{duration:500});
						$("ul li:nth-child("+ (y + 1) +")", obj).addClass("next_in_view");
						$("ul li:nth-child("+ (y - 1) +")", obj).addClass("prev_in_view");
					}
				};
				
				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);
				};
				
			};

			
			/*####################################*/
			
			
			
			/*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);