/*!
 * jQuery Smooth Scroll Plugin v1.4.1
 *
 * Date:Tue Nov 15 14:24:14 2011 EST
 * Requires:jQuery v1.3+
 *
 * Copyright 2010,Karl Swedberg
 * Dual licensed under the MIT and GPL licenses(just like jQuery):
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 */
(function(jQuery){
  var version='1.4.1',
    defaults={
      exclude:[],
      excludeWithin:[],
      offset:0,
      direction:'top',
      // one of 'top' or 'left'
      scrollElement:null,
      // jQuery set of elements you wish to scroll(for jQuery.smoothScroll).
      // if null(default),jQuery('html,body').firstScrollable() is used.
      scrollTarget:null,
      // only use if you want to override default behavior
      beforeScroll:null,
      // fn(opts) function to be called before scrolling occurs. "this" is the element(s) being scrolled
      afterScroll:null,
      // fn(opts) function to be called after scrolling occurs. "this" is the triggering element
      easing:'swing',
      speed:400
    },
    locationPath=filterPath(location.pathname),
    getScrollable=function(opts){
      var scrollable=[],
        scrolled=false,
        dir=opts.dir&&opts.dir=='left'?'scrollLeft':'scrollTop';
      this.each(function(){
        if(this==document||this==window){
          return;
        }
        var el=jQuery(this);
        if(el[dir]()>0){
          scrollable.push(this);
          return;
        }
        el[dir](1);
        scrolled=el[dir]()>0;
        el[dir](0);
        if(scrolled){
          scrollable.push(this);
          return;
        }
      });
      if(opts.el==='first'&&scrollable.length){
        scrollable=[scrollable.shift()];
      }
      return scrollable;
    };
  jQuery.fn.extend({
    scrollable:function(dir){
      var scrl=getScrollable.call(this,{
        dir:dir
      });
      return this.pushStack(scrl);
    },
    firstScrollable:function(dir){
      var scrl=getScrollable.call(this,{
        el:'first',
        dir:dir
      });
      return this.pushStack(scrl);
    },
    smoothScroll:function(options){
      options=options||{};
      var opts=jQuery.extend({},jQuery.fn.smoothScroll.defaults,options);
      this.die('click.smoothscroll').live('click.smoothscroll',function(event){
        var clickOpts={},
          link=this,
          $link=jQuery(this),
          hostMatch=((location.hostname===link.hostname)||!link.hostname),
          pathMatch=opts.scrollTarget||(filterPath(link.pathname)||locationPath)===locationPath,
          thisHash=escapeSelector(link.hash),
          include=true;
        if(!opts.scrollTarget&&(!hostMatch||!pathMatch||!thisHash)){
          include=false;
        } else{
          var exclude=opts.exclude,
            elCounter=0,
            el=exclude.length;
          while(include&&elCounter<el){
            if($link.is(escapeSelector(exclude[elCounter++]))){
              include=false;
            }
          }
          var excludeWithin=opts.excludeWithin,
            ewlCounter=0,
            ewl=excludeWithin.length;
          while(include&&ewlCounter<ewl){
            if($link.closest(excludeWithin[ewlCounter++]).length){
              include=false;
            }
          }
        }
        if(include){
          event.preventDefault();
          jQuery.extend(clickOpts,opts,{
            scrollTarget:opts.scrollTarget||thisHash,
            link:link
          });
          jQuery.smoothScroll(clickOpts);
        }
      });
      return this;
    }
  });
  jQuery.smoothScroll=function(options,px){
    var opts,$scroller,scrollTargetOffset,scrollerOffset=0,
      offPos='offset',
      scrollDir='scrollTop',
      aniprops={};
    if(typeof options==='number'){
      opts=jQuery.fn.smoothScroll.defaults;
      scrollTargetOffset=options;
    } else{
      opts=jQuery.extend({},jQuery.fn.smoothScroll.defaults,options||{});
      if(opts.scrollElement){
        offPos='position';
        if(opts.scrollElement.css('position')=='static'){
          opts.scrollElement.css('position','relative');
        }
      }
      scrollTargetOffset=px||(jQuery(opts.scrollTarget)[offPos]()&&jQuery(opts.scrollTarget)[offPos]()[opts.direction])||0;
    }
    opts=jQuery.extend({
      link:null
    },opts);
    scrollDir=opts.direction=='left'?'scrollLeft':scrollDir;
    if(opts.scrollElement){
      $scroller=opts.scrollElement;
      scrollerOffset=$scroller[scrollDir]();
    } else{
      $scroller=jQuery('html,body').firstScrollable();
    }
    aniprops[scrollDir]=scrollTargetOffset+scrollerOffset+opts.offset;
    if(jQuery.isFunction(opts.beforeScroll)){
      opts.beforeScroll.call($scroller,opts);
    }
    $scroller.animate(aniprops,{
      duration:opts.speed,
      easing:opts.easing,
      complete:function(){
        if(opts.afterScroll&&jQuery.isFunction(opts.afterScroll)){
          opts.afterScroll.call(opts.link,opts);
        }
      }
    });
  };
  jQuery.smoothScroll.version=version;
  // default options
  jQuery.fn.smoothScroll.defaults=defaults;
  // private function
  function filterPath(string){
    return string.replace(/^\//,'').replace(/(index|default).[a-zA-Z]{3,4}$/,'').replace(/\/$/,'');
  }
  function escapeSelector(str){
    return str.replace(/(:|\.)/g,'\\$1');
  }
})(jQuery);