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/*
 * fixHeight - jQuery Plugin
 * http://www.starryworks.co.jp/blog/tips/javascript/fixheightjs.html
 *
 * Author Koji Kimura @ STARRYWORKS inc.
 * http://www.starryworks.co.jp/
 *
 * Licensed under the MIT License
 *
 */
(function($){
	var isInitialized = false;
	var parents = [];
	var textHeight = 0;
	var $fontSizeDiv;
	$.fn.fixHeight = function() {
		this.each(function(){
			var childrenGroups = getChildren( this );

			$.each( childrenGroups, function(){
				var $children = $(this);
				if ( !$children.filter(":visible").length ) return;
				var row = [];
				var top = 0;
				$children.each(function(){
					if ( top != $(this).position().top ) {
						$(row).sameHeight();
						row = [];
						top = $(this).position().top;
					}
					row.push(this);
				});
				if ( row.length ) $(row).sameHeight();
			});
		});
		init();
		return this;
	}
	$.checkFixHeight = function( i_force ) {
		if ( $fontSizeDiv.height() == textHeight && i_force !== true ) return;
		textHeight = $fontSizeDiv.height();
		$(parents).fixHeight();
	}
	$.fn.sameHeight = function() {
		var maxHeight = 0;
		this.css("height","auto");
		this.each(function(){
			if ( $(this).height() > maxHeight ) maxHeight = $(this).height();
		});
		return this.height(maxHeight);
	}
	function getChildren( i_parent ) {
		var $parent = $( i_parent );
		if ( $parent.data("fixHeightChildrenGroups") ) return $parent.data("fixHeightChildrenGroups");
		var childrenGroups = [];
		var $children = $parent.find(".fixHeightChild");
		if ( $children.length ) childrenGroups.push( $children );
		var $groupedChildren = $parent.find("*[class*='fixHeightChild']:not(.fixHeightChild)");
		if ( $groupedChildren.length ) {
			var classNames = {};
			$groupedChildren.each(function(){
				var a = $(this).attr("class").split(" ");
				var i;
				var l = a.length;
				var c;
				for ( i=0; i<l; i++ ) {
					c = a[i].match(/fixHeightChild[a-z0-9_-]+/i);
					if ( !c ) continue;
					c = c.toString();
					if ( c ) classNames[c] = c;
				}
			});
			for ( var c in classNames ) childrenGroups.push( $parent.find("."+c) );
		}
		if ( !childrenGroups.length ) {
			$children = $parent.children();
			if ( $children.length ) childrenGroups.push( $children );
		}
		$parent.data("fixHeightChildrenGroups", childrenGroups );
		parents.push( $parent );
		return childrenGroups;
	}
	function init() {
		if ( isInitialized ) return;
		isInitialized = true;
		$fontSizeDiv = $(document).append('<div style="position:absolute;left:-9999px;top:-9999px;">s</div>');
		setInterval($.checkFixHeight,1000);
		$(window).resize($.checkFixHeight);
		$.checkFixHeight();
		$(window).load( function(){ $.checkFixHeight(true); } );
	}
})(jQuery);

jQuery(document).ready(function(){
	$(".fixHeight").fixHeight();
});