namespace Unity.Netcode
{
    internal struct DisconnectReasonMessage : INetworkMessage
    {
        public string Reason;

        public int Version => 0;

        public void Serialize(FastBufferWriter writer, int targetVersion)
        {
            string reasonSent = Reason ?? string.Empty;

            // Since we don't send a ConnectionApprovedMessage, the version for this message is encded with the message
            // itself. However, note that we HAVE received a ConnectionRequestMessage, so we DO have a valid targetVersion
            // on this side of things - we just have to make sure the receiving side knows what version we sent it,
            // since whoever has the higher version number is responsible for versioning and they may be the one
            // with the higher version number.
            BytePacker.WriteValueBitPacked(writer, Version);

            if (writer.TryBeginWrite(FastBufferWriter.GetWriteSize(reasonSent)))
            {
                writer.WriteValue(reasonSent);
            }
            else
            {
                writer.WriteValueSafe(string.Empty);
                NetworkLog.LogWarning(
                    "Disconnect reason didn't fit. Disconnected without sending a reason. Consider shortening the reason string.");
            }
        }

        public bool Deserialize(FastBufferReader reader, ref NetworkContext context, int receivedMessageVersion)
        {
            // Since we don't get a ConnectionApprovedMessage, the version for this message is encded with the message
            // itself. This will override what we got from MessagingSystem... which will always be 0 here.
            ByteUnpacker.ReadValueBitPacked(reader, out receivedMessageVersion);
            reader.ReadValueSafe(out Reason);
            return true;
        }

        public void Handle(ref NetworkContext context)
        {
            ((NetworkManager)context.SystemOwner).DisconnectReason = Reason;
        }
    };
}