/*
 *   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',
      prevClass:     'prevBtn',
      nextId:     'nextBtn',
      nextText:     'Next',
      nextClass:     'nextBtn',
      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:      2000,
      continuous:    false,
      numeric:     false,
      numericId:     'controls'
    };

    var options = $.extend(defaults, options);

    this.each(function() {
      var obj = $(this);
      var ul_obj = obj.children("ul");
      var li_obj = ul_obj.children("li");
      var s = li_obj.length;
      var w = li_obj.width();
      var h = li_obj.height();
      var clickable = true;

      /* ## Hack the width definition.CREATED by caifeng on 20090818. ## */
      w = w ? w :
          (t = li_obj.css("width")) && t ?
          parseInt(t.replace('px', '')) || 0 : 0;
      h = h ? h :
          (t = li_obj.css("height")) && t ?
          parseInt(t.replace('px', '')) || 0 : 0;
      if (options.vertical && h==0) return false;
      if (!options.vertical && w==0) return false;
      /* ############################################################### */

      if (!options.vertical) obj.width(w);
      if (options.vertical) 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 class="' + options.prevClass + '" id="'+ options.prevId +'"><a href=\"javascript:void(0);\">'+ options.prevText +'</a></span>';
          html += ' <span class="' + options.nextClass + '" 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 adjust_control(){
        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();
                };
        };
      }

      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 }
            );
          };

          adjust_control();
          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);

      adjust_control();
      obj.show("fast");
    });

  };

})(jQuery);