/*
 *        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:       false,
                     controlsBefore:       '',
                     controlsAfter:       '',       
                     controlsFade:       true,
                     firstId:               'firstBtn',
                     firstText:               'First',
                     firstShow:              false,
                     lastId:               'lastBtn',       
                     lastText:               'Last',
                     lastShow:              false,                            
                     vertical:              false,
                     speed:                      500,
                     auto:                     false,
                     pause:                     4000,
                     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);                     
                     
                     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);
                            });
                            $("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(){
                            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);