sharp-chat/SharpChat/Packet/UserDisconnectPacket.cs

using System;

namespace SharpChat.Packet {
    public enum UserDisconnectReason {
        Leave,
        TimeOut,
        Kicked,
        Flood,
    }

    public class UserDisconnectPacket : ServerPacket {
        private readonly DateTimeOffset Disconnected;
        private readonly long UserId;
        private readonly string UserName;
        private readonly UserDisconnectReason Reason;

        public UserDisconnectPacket(
            DateTimeOffset disconnected,
            long userId,
            string userName,
            UserDisconnectReason reason
        ) {
            Disconnected = disconnected;
            UserId = userId;
            UserName = userName ?? throw new ArgumentNullException(nameof(userName));
            Reason = reason;
        }

        public override string Pack() {
            return string.Format(
                "3\t{0}\t{1}\t{2}\t{3}\t{4}",
                UserId,
                UserName,
                Reason switch {
                    UserDisconnectReason.Leave => "leave",
                    UserDisconnectReason.TimeOut => "timeout",
                    UserDisconnectReason.Kicked => "kick",
                    UserDisconnectReason.Flood => "flood",
                    _ => "leave",
                },
                Disconnected.ToUnixTimeSeconds(),
                SequenceId
            );
        }
    }
}