class Program
    {
        static string AuthCode;

        static void Main(string[] args)
        {
            if (args.Length != 2 && args.Length != 3)
            {
                Console.WriteLine("Userage: {0} username password <guardtoken>");
                return;
            }

            SteamClient c = new SteamClient(CMClient.ConnectionType.Tcp);
            SteamFriends steamFriends = c.GetHandler<SteamFriends>();
            SteamUser steamUser = c.GetHandler<SteamUser>();

            c.Connect();

            if (File.Exists("guard_" + args[0] + ".key"))
            {
                AuthCode = File.ReadAllText("guard_" + args[0] + ".key");
            }

            if (args.Length == 3)
            {
                AuthCode = args[2];
            }

            while (true)
            {
                CallbackMsg msg = c.GetCallback();

                if (msg == null)
                    continue;

                c.FreeLastCallback();

                if (msg.IsType<SteamClient.ConnectedCallback>())
                {
                    steamUser.LogOn(new SteamUser.LogOnDetails()
                    {
                        Username = args[0],
                        Password = args[1],
                        AuthCode = AuthCode
                    });
                }
                if (msg.IsType<SteamUser.LoggedOnCallback>())
                {
                    var logOnResp = (SteamUser.LoggedOnCallback)msg;

                    if (logOnResp.Result == EResult.AccountLogonDenied)
                    {
                        Console.Write("SteamGuard key: ");
                        AuthCode = Console.ReadLine();
                        File.WriteAllText("guard_" + args[0] + ".key", AuthCode);
                        c.Connect();
                    }
                }
                if (msg.IsType<SteamUser.SessionTokenCallback>())
                {
                    var message = (SteamUser.SessionTokenCallback)msg;
                    Console.WriteLine(message.SessionToken);
                    Console.WriteLine("Logged in as {0}", steamFriends.GetPersonaName());
                }
                if (msg.IsType<SteamUser.AccountInfoCallback>())
                {
                    var message = (SteamUser.AccountInfoCallback)msg;
                }

            }
        }
    }