/**
 * 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 (value === null) {
			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;
	}
};
