/*
 * supposition v0.2 - an optional enhancer for superfish jquery menu widget.
 *
 * copyright (c) 2008 joel birch - based mostly on work by jesse klaasse and credit goes largely to him.
 * special thanks to karl swedberg for valuable input.
 *
 * dual licensed under the mit and gpl licenses:
 *  http://www.opensource.org/licenses/mit-license.php
 *  http://www.gnu.org/licenses/gpl.html
 */
/*
 * this is not the original jquery supposition plugin.
 * please refer to the readme for more information.
 */

(function($){
  $.fn.supposition = function(){
    var $w = $(window), /*do this once instead of every onbeforeshow call*/
    _offset = function(dir) {
      return window[dir == 'y' ? 'pageyoffset' : 'pagexoffset']
      || document.documentelement && document.documentelement[dir=='y' ? 'scrolltop' : 'scrollleft']
      || document.body[dir=='y' ? 'scrolltop' : 'scrollleft'];
    },
    onhide = function(){
      this.css({bottom:''});
    },
    onbeforeshow = function(){
      this.each(function(){
        var $u = $(this);
        $u.css('display','block');
        var $mul = $u.closest('.sf-menu'),
        level = $u.parents('ul').length,
        menuwidth = $u.width(),
        menuparentwidth = $u.closest('li').outerwidth(true),
        menuparentleft = $u.closest('li').offset().left,
        totalright = $w.width() + _offset('x'),
        menuright = $u.offset().left + menuwidth,
        exactmenuwidth = (menuright > (menuparentwidth + menuparentleft)) ? menuwidth - (menuright - (menuparentwidth + menuparentleft)) : menuwidth;
        if ($u.parents('.sf-js-enabled').hasclass('rtl')) {
          if (menuparentleft < exactmenuwidth) {
            if (($mul.hasclass('sf-horizontal') && level == 1) || ($mul.hasclass('sf-navbar') && level == 2)){
              $u.css({left:0,right:'auto'});
            }
            else {
              $u.css({left:menuparentwidth + 'px',right:'auto'});
            }
          }
        }
        else {
          if (menuright > totalright && menuparentleft > menuwidth) {
            if (($mul.hasclass('sf-horizontal') && level == 1) || ($mul.hasclass('sf-navbar') && level == 2)){
              $u.css({right:0,left:'auto'});
            }
            else {
              $u.css({right:menuparentwidth + 'px',left:'auto'});
            }
          }
        }
        var windowheight = $w.height(),
        offsettop = $u.offset().top,
        menuparentshadow = ($mul.hasclass('sf-shadow') && $u.css('padding-bottom').length > 0) ? parseint($u.css('padding-bottom').slice(0,-2)) : 0,
        menuparentheight = ($mul.hasclass('sf-vertical')) ? '-' + menuparentshadow : $u.parent().outerheight(true) - menuparentshadow,
        menuheight = $u.height(),
        baseline = windowheight + _offset('y');
        var expandup = ((offsettop + menuheight > baseline) && (offsettop > menuheight));
        if (expandup) {
          $u.css({bottom:menuparentheight + 'px',top:'auto'});
        }
        $u.css('display','none');
      });
    };

    return this.each(function() {
      var o = $.fn.superfish.o[this.serial]; /* get this menu's options */

      /* if callbacks already set, store them */
      var _onbeforeshow = o.onbeforeshow,
      _onhide = o.onhide;

      $.extend($.fn.superfish.o[this.serial],{
        onbeforeshow: function() {
          onbeforeshow.call(this); /* fire our supposition callback */
          _onbeforeshow.call(this); /* fire stored callbacks */
        },
        onhide: function() {
          onhide.call(this); /* fire our supposition callback */
          _onhide.call(this); /* fire stored callbacks */
        }
      });
    });
  };
})(jquery);