import { BufferWriter } from '@node-dlc/bufio';

import { AddressIPv6 } from '../../domain/AddressIPv6';
import { ipv6StringToBuffer } from './ipv6StringToBuffer';

/**
 * Serializes an IPv6 address in a Buffer that can be sent
 * over the wire.
 */
export function serializeIPv6(address: AddressIPv6): Buffer {
  const writer = new BufferWriter(Buffer.alloc(19));

  const hostBytes = ipv6StringToBuffer(address.host);

  writer.writeUInt8(address.type);
  writer.writeBytes(hostBytes);
  writer.writeUInt16BE(address.port);

  return writer.toBuffer();
}