/*
 * Multi-level Drop Down Menu 3.0
 * April 17, 2010
 * Corey Hart @ http://www.codenothing.com
 */ 
(function($, window, undefined) {
  // Needed for IE Compatibility (Closing menus must be done backwards in IE)
  // Ensure that no complications arise from other libraries modifying the 
  // array functionality (and hope that they store the old reverse function into _reverse)
  var el, a = Array.prototype, Reverse = a._reverse || a.reverse;

  // bgiframe is needed to fix z-index problem for IE6 users.
  // For applications that don't have bgiframe plugin installed, create a useless 
  // function that doesn't break the chain
  function emptyfn() {
    return this;
  }

  // Cache common event functions so they aren't instantiated with each event
  function clearSiblings() {
    var self = $(el = this);
    self.removeClass($.data(el.parentNode, 'multi-ddm-classname'))
        .children('a').removeClass($.data(el.parentNode, 'multi-ddm-classname'));
  }

  function oldMenus() {
    var self = $(el = this);
    self.slideUp(100);
    self.removeClass($.data(el.parentNode.parentNode, 'multi-ddm-classname'))
        .siblings('a').removeClass($.data(el.parentNode.parentNode, 'multi-ddm-classname'));
  }

  // Expose the drop down menu
  $.fn.dropDownMenu = function(options) {
    return this.each(function() {
      // Defaults with metadata support
      var $main = $(this), i = 0, $menu, timeout,
				settings = $.extend({
				  timer: 500,
				  parentMO: undefined,
				  childMO: undefined,
				  bgiframe: undefined,
				  levels: []
				}, options || {}, $.metadata ? $main.metadata() : {}),

      // Check on every initiation, so bgiframe can be loaded after this plugin
				bgiframe = $.fn.bgiframe || $.fn.bgIframe || emptyfn;

      // Loop through each level, attach the bgiframe and store it's classname
      $menu = $main.data('multi-ddm-classname', settings.levels[0] || settings.parentMO || settings.childMO || '');
      while ($menu.length > 0) {
        $menu = bgiframe.call(
					$menu.find('> li > ul').data('multi-ddm-classname', settings.levels[++i] || settings.childMO || ''),
					settings.bgiframe
				);
      }

      // Use event delegation to track mouse movement across the menu
      $main.delegate('li', 'mouseenter.multi-ddm', function() {
        var self = $(el = this);

        if (timeout) {
          clearTimeout(timeout);
        }

        // Close old menus and remove hover of non-menus
        Reverse.call(self.siblings('li').find('ul:visible')).each(oldMenus).end().each(clearSiblings);

        // Open new menu and remove any lingering hover elements
        self.addClass($.data(el.parentNode, 'multi-ddm-classname'));
        self.children('a').addClass($.data(el.parentNode, 'multi-ddm-classname')).siblings('ul')
            .slideDown('fast')
            .children('li').each(clearSiblings);
      })
			.bind('mouseleave.multi-ddm', function() {
			  timeout = setTimeout(closemenu, settings.timer);
			});

      // Closes all open menus
      function closemenu() {
        // Clear mouseovers
        $main.find('li').each(clearSiblings);

        // Close Menus backwards for IE Compatibility
        Reverse.call($main.find('ul:visible')).slideUp('fast');

        if (timeout) {
          clearTimeout(timeout);
        }
      }

      // Allows user option to close menus by clicking outside the menu on the body
      $(window.document).bind('click.multi-ddm', closemenu);
    });
  };
})(jQuery, window || this);