continuity/Wonderking/Packets/Outgoing/ChannelSelectionResponsePacket.cs

// Copyright (c) 2023 Timothy Schenk. Subject to the GNU AGPL Version 3 License.

using System.Buffers.Binary;
using System.Text;
using Rai.PacketMediator;
using Wonderking.Packets.Outgoing.Data;

namespace Wonderking.Packets.Outgoing;

[WonderkingPacketId(OperationCode.ChannelSelectionResponse)]
public class ChannelSelectionResponsePacket : IOutgoingPacket
{
    public required byte ChannelIsFullFlag { get; set; }
    public required string Endpoint { get; set; }
    public required ushort Port { get; set; }
    public required CharacterData[] Characters { get; set; }

    public byte[] Serialize()
    {
        Span<byte> data = stackalloc byte[1 + 16 + 2 + 1 + 132 * Characters.Length];
        data.Clear();
        data[0] = ChannelIsFullFlag;
        Encoding.ASCII.GetBytes(Endpoint, data.Slice(1, 16));
        BinaryPrimitives.WriteUInt16LittleEndian(data.Slice(17, 2), Port);
        data[19] = (byte)Characters.Length;

        // Character Data
        for (var i = 0; i < Characters.Length; i++)
        {
            var offset = 20 + i * 132;
            var character = Characters[i];
            // Character Data
            BinaryPrimitives.WriteInt32LittleEndian(data.Slice(offset, 4), i);
            Encoding.ASCII.GetBytes(character.Name, data.Slice(offset + 4, 20));

            // Job Data
            data[offset + 24] = character.Job.FirstJob;
            data[offset + 25] = character.Job.SecondJob;
            data[offset + 26] = character.Job.ThirdJob;
            data[offset + 27] = character.Job.FourthJob;

            data[offset + 28] = (byte)character.Gender;
            BinaryPrimitives.WriteUInt16LittleEndian(data.Slice(offset + 29, 2), character.Level);
            data[offset + 31] = (byte)character.Experience;

            // Stats
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(offset + 32, 2), character.Stats.Strength);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(offset + 34, 2), character.Stats.Dexterity);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(offset + 36, 2), character.Stats.Intelligence);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(offset + 38, 2), character.Stats.Vitality);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(offset + 40, 2), character.Stats.Luck);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(offset + 42, 2), character.Stats.Wisdom);

            BinaryPrimitives.WriteInt32LittleEndian(data.Slice(offset + 44, 4), character.Health);
            BinaryPrimitives.WriteInt32LittleEndian(data.Slice(offset + 48, 4), character.Mana);

            for (var j = 0; j < 20; j++)
            {
                // Equipped Items
                BinaryPrimitives.WriteUInt16LittleEndian(data.Slice(offset + 52 + j * 2, 2),
                    character.EquippedItems.Length > j ? character.EquippedItems[j] : (ushort)0);

                // Equipped Cash Items
                BinaryPrimitives.WriteUInt16LittleEndian(data.Slice(offset + 92 + j * 2, 2),
                    character.EquippedCashItems.Length > j ? character.EquippedCashItems[j] : (ushort)0);
            }
        }

        return data.ToArray();
    }
}