/*
 */

;(function($){ // $ will refer to jquery within this closure

	$.fn.supersubs = function(options){
		var opts = $.extend({}, $.fn.supersubs.defaults, options);
		// return original object to support chaining
		return this.each(function() {
			// cache selections
			var $$ = $(this);
			// support metadata
			var o = $.meta ? $.extend({}, opts, $$.data()) : opts;
			// get the font size of menu.
			// .css('fontsize') returns various results cross-browser, so measure an em dash instead
			var fontsize = $('<li id="menu-fontsize">&#8212;</li>').css({
				'padding' : 0,
				'position' : 'absolute',
				'top' : '-999em',
				'width' : 'auto'
			}).appendto($$).width(); //clientwidth is faster, but was incorrect here
			// remove em dash
			$('#menu-fontsize').remove();
			// cache all ul elements
			$uls = $$.find('ul');
			// loop through each ul in menu
			$uls.each(function(i) {	
				// cache this ul
				var $ul = $uls.eq(i);
				// get all (li) children of this ul
				var $lis = $ul.children();
				// get all anchor grand-children
				var $as = $lis.children('a');
				// force content to one line and save current float property
				var lifloat = $lis.css('white-space','nowrap').css('float');
				// remove width restrictions and floats so elements remain vertically stacked
				var emwidth = $ul.add($lis).add($as).css({
					'float' : 'none',
					'width'	: 'auto'
				})
				// this ul will now be shrink-wrapped to longest li due to position:absolute
				// so save its width as ems. clientwidth is 2 times faster than .width() - thanks dan switzer
				.end().end()[0].clientwidth / fontsize;
				// add more width to ensure lines don't turn over at certain sizes in various browsers
				emwidth += o.extrawidth;
				// restrict to at least minwidth and at most maxwidth
				if (emwidth > o.maxwidth)		{ emwidth = o.maxwidth; }
				else if (emwidth < o.minwidth)	{ emwidth = o.minwidth; }
				emwidth += 'em';
				// set ul to width in ems
				$ul.css('width',emwidth);
				// restore li floats to avoid ie bugs
				// set li width to full width of this ul
				// revert white-space to normal
				$lis.css({
					'float' : lifloat,
					'width' : '100%',
					'white-space' : 'normal'
				})
				// update offset position of descendant ul to reflect new width of parent
				.each(function(){
					var $childul = $('>ul',this);
					var offsetdirection = $childul.css('left')!==undefined ? 'left' : 'right';
					$childul.css(offsetdirection,emwidth);
				});
			});
			
		});
	};
	// expose defaults
	$.fn.supersubs.defaults = {
		minwidth		: 9,		// requires em unit.
		maxwidth		: 25,		// requires em unit.
		extrawidth		: 0			// extra width can ensure lines don't sometimes turn over due to slight browser differences in how they round-off values
	};
	
})(jquery); // plugin code ends