/*
 *  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 = {      
      prevText:     'Previous',
      nextText:     'Next',
      controlsShow: true,
      vertical:   false,
      speed:      800,
      auto:     false,
      pause:      2000,
      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');
     
      nextA = null;
      prevA = null;
      if(options.controlsShow){
        prev = document.createElement('span');
        if($("li", obj).length > 1) {
          prevA = document.createElement('a');
          prevA.href = '#';
          prevA.appendChild(document.createTextNode(options.prevText));
          prev.appendChild(prevA);
        }
        $(prev).addClass('previous');

        next = document.createElement('span');
        if($("li", obj).length > 1) {
          nextA = document.createElement('a');
          nextA.href = '#';
          nextA.appendChild(document.createTextNode(options.nextText));
          next.appendChild(nextA);
        }
        $(next).addClass('next');
        
        $(obj).before(next);
        $(obj).before(prev);
      };
 
      if(nextA) {
        $(nextA).click(function(){    
          animate("next",true);
          return false;
        });
      }
      if(prevA) {
        $(prevA).click(function(){   
          animate("prev",true);       
          return false;
        }); 
      }
      
      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);
      };    
    });
    
  };

})(jQuery);