abstract class Command
    {
        public DateTime Timestamp { get; } = DateTime.Now;
        public CommandTypes Type { get; protected set; }

        public string RawText { get; }

        public Command ParsedCommand { get; }

        public Command(string rawCommand)
        {
            RawText = rawCommand;
        }

        abstract public T TryCreateNew<T>(Newtonsoft.Json.Linq.JObject json) where T : Command, new();
    }

    class Login : Command
    {
        public readonly string Username;
        public readonly string Password;

        private Login(string rawText, string username, string password) : base(rawText)
        {
            Username = username;
            Password = password;
        }

        public override Login TryCreateNew<Login>(Newtonsoft.Json.Linq.JObject json)
        {
            var username = json["Username"].ToString();
            var password = json["Password"].ToString();

            if (string.IsNullOrWhiteSpace(username))
                return null;

            if (string.IsNullOrWhiteSpace(password))
                return null;


            var loginCommand = new Login(json.ToString(), username, password);
        }
    }