/*
 *  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:      800,
      auto:     true,
      pause:      2000,
      continuous:  true, 
      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+2)*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);       
        });       
        $("a","#pauseBtn").click(function(){
        	animate("stop",true);
        });
        $("a","#startBtn").click(function(){
        	animate("next",false);
        });
      };
      
      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; 
            case "stop":
              t = t;
              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);