/**
 * Cookie plugin
 *
 * Copyright (c) 2006 Klaus Hartl (stilbuero.de)
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 */

/**
 * Create a cookie with the given name and value and other optional parameters.
 *
 * @example $.cookie('the_cookie', 'the_value');
 * @desc Set the value of a cookie.
 * @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true });
 * @desc Create a cookie with all available options.
 * @example $.cookie('the_cookie', 'the_value');
 * @desc Create a session cookie.
 * @example $.cookie('the_cookie', null);
 * @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain
 *       used when the cookie was set.
 *
 * @param String name The name of the cookie.
 * @param String value The value of the cookie.
 * @param Object options An object literal containing key/value pairs to provide optional cookie attributes.
 * @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object.
 *                             If a negative value is specified (e.g. a date in the past), the cookie will be deleted.
 *                             If set to null or omitted, the cookie will be a session cookie and will not be retained
 *                             when the the browser exits.
 * @option String path The value of the path atribute of the cookie (default: path of page that created the cookie).
 * @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie).
 * @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will
 *                        require a secure protocol (like HTTPS).
 * @type undefined
 *
 * @name $.cookie
 * @cat Plugins/Cookie
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */

/**
 * Get the value of a cookie with the given name.
 *
 * @example $.cookie('the_cookie');
 * @desc Get the value of a cookie.
 *
 * @param String name The name of the cookie.
 * @return The value of the cookie.
 * @type String
 *
 * @name $.cookie
 * @cat Plugins/Cookie
 * @author Klaus Hartl/klaus.hartl@stilbuero.de
 */
jQuery.cookie = function(name, value, options)
{
	if (typeof value != 'undefined')
	// name and value given, set cookie
	{
		options = options || {};

		if (null === value)
		{
			value = '';
			options.expires = -1;
		}
		
		var expires = '';
		
		if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString))
		{
			var date;
			
			if (typeof options.expires == 'number')
			{
				date = new Date();
				date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
			}
			else
				date = options.expires;
			
			expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
		}
		
		// CAUTION: Needed to parenthesize options.path and options.domain
		// in the following expressions, otherwise they evaluate to undefined
		// in the packed version for some reason...
		var path = options.path ? '; path=' + (options.path) : '';
		var domain = options.domain ? '; domain=' + (options.domain) : '';
		var secure = options.secure ? '; secure' : '';
		document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
	}
	else
	// only name given, get cookie
	{
		var cookieValue = null;
		
		if (document.cookie && '' != document.cookie)
		{
			var cookies = document.cookie.split(';');
			
			for (var i = 0; i < cookies.length; i++)
			{
				var cookie = jQuery.trim(cookies[i]);
				
				// Does this cookie string begin with the name we want?
				if (cookie.substring(0, name.length + 1) == (name + '='))
				{
					cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
				
					break;
				}
			}
		}
		
		return cookieValue;
	}
};