sharp-chat/SharpChat/Packet/AuthFailPacket.cs

using SharpChat.Misuzu;
using System;

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

    public class AuthFailPacket : ServerPacket {
        public AuthFailReason Reason { get; private set; }
        public MisuzuBanInfo BanInfo { get; private set; }

        public AuthFailPacket(AuthFailReason reason, MisuzuBanInfo fbi = null) {
            Reason = reason;

            if(reason == AuthFailReason.Banned)
                BanInfo = fbi ?? throw new ArgumentNullException(nameof(fbi));
        }

        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}", BanInfo.IsPermanent ? -1 : BanInfo.ExpiresAt.ToUnixTimeSeconds());

            return packet;
        }
    }
}