/*
 *    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:      '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:       false,
         pause:         5000,
         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);