using HoneycombServer.Utility;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace HoneycombServer.Networking.Packets
{
    /// <summary>
    /// 0x00: Handshake Packet (Serverbound)
    ///
    /// This causes the server to switch into the target state.
    /// </summary>
    class HandshakePacket_C2S : Packet
    {
        internal struct PacketFields
        {
            public int protocolVersion;       // VarInt
            public string serverAddress;      // Length prefixed string
            public ushort serverPort;         // ushort
            public ConnectionState nextState; // VarInt enum
        }

        private PacketFields _fields;
        public PacketFields Fields => _fields;

        public override void ReadPacketData(byte[] data)
        {
            var stream = new MemoryStream(data);
            var reader = new BinaryReader(stream);

            // Read packet fields (protocol version, address)
            int protocolVersion = reader.ReadVarInt();

            int addressLength = reader.ReadVarInt();
            var address = new byte[addressLength];
            int read = stream.Read(address, 0, addressLength);

            // Read the port as a unsigned short (UInt16)
            ushort port = reader.ReadUInt16();
            int nextState = reader.ReadVarInt();

            // Store the packet data in the Data property
            _fields = new PacketFields
            {
                protocolVersion = protocolVersion,
                serverAddress = address.ToString(),
                serverPort = port,
                nextState = (ConnectionState)nextState
            };
        }
    }
}