/**
 * Javascript code to store data as JSON strings in cookies.
 * It uses prototype.js (http://www.prototypejs.org)
 * and json.js (http://www.json.org/json.js)
 *
 * Author : Lalit Patel
 * Website: http://www.lalit.org/lab/jsoncookies
 * License: Creative Commons Attribution-ShareAlike 2.5
 *          http://creativecommons.org/licenses/by-sa/2.5/
 * Updated: Apr 12, 2007 8:50pm
 * 
 * Modified by ccw 9.5.2007 16:34 for prototype 1.5.1 json-handling
 */

var CookieJar = Class.create();

CookieJar.prototype = {
	/**
	 * Initializes the cookie jar with the options.
	 */
	initialize: function(options) {
		this.options = {
			expires: 0,			// seconds
			path: '/',			// cookie path
			domain: '',			// cookie domain
			secure: ''			// secure ?
		};
		Object.extend(this.options, options || {});

		if (this.options.expires != '') {
			var date = new Date();
			date.setTime(date.getTime() + (this.options.expires * 1000));
			this.options.expires = '; expires=' + date.toGMTString();
		}
		if (this.options.path != '') {
			this.options.path = '; path=' + escape(this.options.path);
		}
		if (this.options.domain != '') {
			this.options.domain = '; domain=' + escape(this.options.domain);
		}
		if (this.options.secure == 'secure') {
			this.options.secure = '; secure';
		} else {
			this.options.secure = '';
		}
	},

	/**
	 * Adds a name values pair.
	 */
	put: function(name, value) {
		cookie = this.options;
		var cookie_str = name + "=" + escape(Object.toJSON(value));
		try {
			document.cookie = cookie_str + cookie.expires + cookie.path + cookie.domain + cookie.secure;
		} catch (e) {
			return false;
		}
		return true;
	},

	/**
	 * Removes a particular cookie (name value pair) form the Cookie Jar.
	 */
	remove: function(name) {
		cookie = this.options;
		alert(name);
		try {
			var date = new Date();
			date.setTime(date.getTime() - (3600 * 1000));
			var expires = '; expires=' + date.toGMTString();
			document.cookie = name + "=" + expires + cookie.path + cookie.domain + cookie.secure;
		} catch (e) {
			return false;
		}
		return true;
	},

	/**
	 * Return a particular cookie by name;
	 */
	get: function(name) {
		var value = null;
		var cookies = document.cookie.match(name + '=(.*?)(;|$)');
		if (cookies) {
			try {
				value = unescape(cookies[1]).evalJSON(true);
			} catch (exception) {
				alert('An exception occurred.');
			}				
		}
		return value;
	},

	/**
	 * Empties the Cookie Jar. Deletes all the cookies.
	 */
	empty: function() {
		keys = this.getKeys();
		size = keys.size();
		for(i=0; i<size; i++) {
			this.remove(keys[i]);
		}
	},

	/**
	 * Returns all cookies as a single object
	 */
	getPack: function() {
		pack = {};
		keys = this.getKeys();

		size = keys.size();
		for(i=0; i<size; i++) {
			pack[keys[i]] = this.get(keys[i]);
		}
		return pack;
	},

	/**
	 * Returns all keys.
	 */
	getKeys: function() {
		keys = $A();
		keyRe= /[^=; ]+(?=\=)/g;
		str  = document.cookie;
		while((match = keyRe.exec(str)) != undefined) {
			keys.push(match[0].strip());
		}
		return keys;
	}
};