/*
 * 	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 = {			
      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, 
      numeric: 		false,
      numericId: 		'controls'
    }; 

    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); 
        obj.height(h); 
        obj.css("overflow","hidden");
        var ts = s-1;
        var t = 0;
        $("ul", obj).css('width',s*w);			

        var os = 0;
        for( os; os<s; os++ ){
          $('#slider li').each( function(index){
            $(this).attr('id', 'controls' + index);
          });
        };

        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>';
            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);
              dir = "next";
          });
          $("a","#"+options.prevId).click(function(){		
              animate("prev",true);				
              dir = "prev";
          });	
          $("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;						
							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);