/*
 * 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 jQueryfontSizeDiv;
	
	jQuery.fn.fixHeight = function() {
		this.each(function(){
			var childrenGroups = getChildren( this );
			
			jQuery.each( childrenGroups, function(){
				
				var $children = jQuery(this);
				if ( !$children.filter(":visible").length ) return;
				
				var row = [];
				var top = 0;
				$children.each(function(){
					if ( top != jQuery(this).position().top ) {
						jQuery(row).sameHeight();
						row = [];
						top = jQuery(this).position().top;
					}
					row.push(this);
				});
				if ( row.length ) jQuery(row).sameHeight();
			});
			
			
		});
		init();
		return this;
	}
	
	jQuery.checkFixHeight = function( i_force ) {
		if ( $fontSizeDiv.height() == textHeight && i_force !== true ) return;
		textHeight = $fontSizeDiv.height();
		jQuery(parents).fixHeight();
	}
	
	jQuery.fn.sameHeight = function() {
		var maxHeight = 0;
		this.css("height","auto");
		this.each(function(){
			if ( jQuery(this).height() > maxHeight ) maxHeight = jQuery(this).height();
		});
		return this.height(maxHeight);
	}
	
	function getChildren( i_parent ) {
		var $parent = jQuery( 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 = jQuery(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 = jQuery(document).append('<div style="position:absolute;left:-9999px;top:-9999px;">s</div>');
		setInterval(jQuery.checkFixHeight,1000);
		jQuery(window).resize(jQuery.checkFixHeight);
		jQuery.checkFixHeight();
		jQuery(window).load( function(){ jQuery.checkFixHeight(true); } );
	}
	
})(jQuery);



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