/*
 *        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
 *
 */

(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:                      800,
                     auto:                     true,
                     pause:                     8000,
                     continuous:              true
              }; 
              
              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(); 
                     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.vertical) $("li", 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);                                                                      
                     };
       
                     $("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;                            
                            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(!options.vertical) {
                                   p = (t*w*-1);
                                   $("ul",obj).animate(
                                          { marginLeft: p }, 
                                          speed
                                   );                            
                            } else {
                                   p = (t*h*-1);
                                   $("ul",obj).animate(
                                          { marginTop: p }, 
                                          speed
                                   );                                   
                            };
                            
                            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.continuous && options.controlsFade){                                   
                            $("a","#"+options.prevId).hide();
                            $("a","#"+options.firstId).hide();                            
                     };                            
                     
              });
         
       };

})(jQuery);