/* 
 * Auto Expanding Text Area (1.2.2)
 * by Chrys Bader (www.chrysbader.com)
 * chrysb@gmail.com
 *
 * Special thanks to:
 * Jake Chapa - jake@hybridstudio.com
 * John Resig - jeresig@gmail.com
 *
 * Copyright (c) 2008 Chrys Bader (www.chrysbader.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 *
 * NOTE: This script requires jQuery to work.  Download jQuery at www.jquery.com
 *
 */
 
(function(jQuery) {
		  
	var self = null;
 
	jQuery.fn.autogrow = function(o)
	{	      
		return this.each(function() {
			new jQuery.autogrow(this, o);
		});
	};
	

    /**
     * The autogrow object.
     *
     * @constructor
     * @name jQuery.autogrow
     * @param Object e The textarea to create the autogrow for.
     * @param Hash o A set of key/value pairs to set as configuration properties.
     * @cat Plugins/autogrow
     */
	
	jQuery.autogrow = function (e, o)
	{
		this.options		  	= o || {};
		this.dummy			  	= null;
		this.interval	 	  	= null;
		this.line_height	  	= this.options.lineHeight || parseInt(jQuery(e).css('line-height'));
		this.min_height		  	= this.options.minHeight || parseInt(jQuery(e).css('min-height'));
		this.max_height		  	= this.options.maxHeight || parseInt(jQuery(e).css('max-height'));;
		this.textarea		  	= jQuery(e);

		//@ Fix by Nicholas
		this.deltaWidth = this.options.deltaWidth || 0;

		if(this.line_height == NaN)
		  this.line_height = 0;
		
		// Only one textarea activated at a time, the one being used
		this.init();
	};
	
	jQuery.autogrow.fn = jQuery.autogrow.prototype = {
    autogrow: '1.2.2'
  };
	
 	jQuery.autogrow.fn.extend = jQuery.autogrow.extend = jQuery.extend;
	
	jQuery.autogrow.fn.extend({
						 
		init: function() {
			var self = this;			
			this.textarea.css({overflow: 'hidden', display: 'block'});
			this.textarea.bind('focus', function() { self.startExpand() } ).bind('blur', function() { self.stopExpand() });
			this.checkExpand();
		},
						 
		startExpand: function() {				
		  var self = this;
			this.interval = window.setInterval(function() {self.checkExpand()}, 400);
		},
		
		stopExpand: function() {
			clearInterval(this.interval);	
		},
		
		checkExpand: function() {
			
			if (this.dummy == null)
			{                         
				this.dummy = jQuery('<div></div>');
				this.dummy.css({
												'font-size'  : this.textarea.css('font-size'),
												'font-family': this.textarea.css('font-family'),
												// @ Fix by Nicholas
												'width'      : parseInt(this.textarea.css('width')) + this.deltaWidth,
												// @ Fix by Nicholas
												// 'padding' causes the error with 'undefined' value when 'padding' has multiple values
												'paddingLeft'   : this.textarea.css('paddingLeft'),
												'paddingTop'    : this.textarea.css('paddingTop'),
												'paddingRight'  : this.textarea.css('paddingRight'),
												'paddingBottom' : this.textarea.css('paddingBottom'),
												//----------------------
												'line-height': this.line_height + 'px',
												'overflow-x' : 'hidden',
												'position'   : 'absolute',
												'top'        : 0,
												'left'		 : -9999
												}).appendTo('body');
			}

			//@ Fix by Nicholas
			// Strip HTML tags
			var html = this.textarea.val().replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\s\s/, '&nbsp;&nbsp;');
			if (html.replace(/\s/g, '')=='')
				html = '&nbsp;'

			// IE is different, as per usual
			if ($.browser.msie) {
				html = html.replace(/\n/g, '<BR>new');
			}
			else {
				html = html.replace(/\n/g, '<br>new');
			}
			
			if (this.dummy.html() != html) {
				this.dummy.html(html);	
				if (this.max_height > 0 && (this.dummy.height() + this.line_height > this.max_height)) {
					this.textarea.css('overflow-y', 'auto');	
				}
				else {
					this.textarea.css('overflow-y', 'hidden');
					var height = (this.dummy.height() < this.min_height) ? this.min_height : this.dummy.height();
					
					if (this.textarea.height() < height + this.line_height || (height < this.textarea.height())) {
						//@ Fix by Nicholas
						this.textarea.animate({height: (height /*+ this.line_height*/) + 'px'}, 100);
					}
				}
			}
		}
						 
	 });
})(jQuery);