using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace Core
{
	public class UserLeavePacket : IPacket
	{
		public string Nickname { get; private set; }

		public UserLeavePacket(string nickname)
		{
			Nickname = nickname;
		}

		public UserLeavePacket(byte[] buffer)
		{
			int cursor = 2;

			short nicknameSize = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(buffer, cursor));
			cursor += sizeof(short);

			Nickname = Encoding.UTF8.GetString(buffer, cursor, nicknameSize);
		}

		public byte[] Serialize()
		{
			// 2bytes header
			// data: 2bytes packetType + 2bytes id size + id + 2bytes nickname size + nickname

			byte[] packetType = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)PacketType.UserLeave));
			byte[] roomName = Encoding.UTF8.GetBytes(Nickname);
			byte[] roomNameSize = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)roomName.Length));

			short dataSize = (short)(packetType.Length + roomName.Length + roomNameSize.Length);
			byte[] header = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(dataSize));

			byte[] buffer = new byte[2 + dataSize];

			int cursor = 0;
			Array.Copy(header, 0, buffer, cursor, header.Length);
			cursor += header.Length;

			Array.Copy(packetType, 0, buffer, cursor, packetType.Length);
			cursor += packetType.Length;

			Array.Copy(roomNameSize, 0, buffer, cursor, roomNameSize.Length);
			cursor += roomNameSize.Length;

			Array.Copy(roomName, 0, buffer, cursor, roomName.Length);

			return buffer;
		}
	}
}