sharp-chat/SharpChat/Packet/AuthFailPacket.cs

using System;

namespace SharpChat.Packet {
    public enum AuthFailReason {
        AuthInvalid,
        MaxSessions,
        Banned,
        Null,
    }

    public class AuthFailPacket : ServerPacket {
        private readonly AuthFailReason Reason;
        private readonly DateTimeOffset Expires;

        public AuthFailPacket(AuthFailReason reason) {
            Reason = reason;
        }

        public AuthFailPacket(DateTimeOffset expires) {
            Reason = AuthFailReason.Banned;
            Expires = expires;
        }

        public override string Pack() {
            string packet = string.Format("1\tn\t{0}fail", Reason switch {
                AuthFailReason.AuthInvalid => "auth",
                AuthFailReason.MaxSessions => "sock",
                AuthFailReason.Banned => "join",
                _ => "user",
            });

            if(Reason == AuthFailReason.Banned)
                packet += string.Format("\t{0}", Expires.Year >= 2100 ? -1 : Expires.ToUnixTimeSeconds());

            return packet;
        }
    }
}