// Author: David Winterbottom
// Source: http://codeinthehole.com/archives/5-Javascript-cookie-objects-using-Prototype-and-JSON.html

var Cookies = Class.create({
    initialize: function(path, domain) {
        this.path = path || '/';
        this.domain = domain || null;
    },
    // Sets a cookie
    set: function(key, value, days) {
        if (typeof key != 'string') {
            throw "Invalid key";
        }
        if (typeof value != 'string' && typeof value != 'number') {
            throw "Invalid value";
        }
        if (days && typeof days != 'number') {
            throw "Invalid expiration time";
        }
        var setValue = key+'='+escape(new String(value));
        if (days) {
            var date = new Date();
            date.setTime(date.getTime()+(days*24*60*60*1000));
            var setExpiration = "; expires="+date.toGMTString();
        } else var setExpiration = "";
        var setPath = '; path='+escape(this.path);
        var setDomain = (this.domain) ? '; domain='+escape(this.domain) : '';
        var cookieString = setValue+setExpiration+setPath+setDomain;
        document.cookie = cookieString;
    },
    // Returns a cookie value or false
    get: function(key) {
        var keyEquals = key+"=";
        var value = false;
        document.cookie.split(';').invoke('strip').each(function(s){
            if (s.startsWith(keyEquals)) {
                value = unescape(s.substring(keyEquals.length, s.length));
                throw $break;
            }
        });
        return value;
    },
    // Clears a cookie
    clear: function(key) {
        this.set(key,'',-1);
    },
    // Clears all cookies
    clearAll: function() {
        document.cookie.split(';').collect(function(s){
            return s.split('=').first().strip();
        }).each(function(key){
            this.clear(key);
        }.bind(this));
    }
});

var JsonCookies = Class.create(Cookies, {});
JsonCookies.addMethods({
    // Overridden set method to JSON-encode value
    set: function($super, key, value, days) {
        switch (typeof value) {
            case 'undefined':
            case 'function':
            case 'unknown': 
                throw "Invalid value type";
                break;
            case 'boolean': 
            case 'string': 
            case 'number': 
                value = String(value.toString());
            break;
        }
        $super(key, Object.toJSON(value), days);
    },
    // Overriden get method to JSON-decode the value
    get: function($super, key) {
        var value = $super(key);
        return (value) ? value.evalJSON() : false;
    }
});