/*
 *    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
 *
 */
 
/*
 * 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:         6000,
         continuous:    false
      }; 
      
      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);