using System.Buffers.Binary;
using System.Text;

namespace Wonderking.Packets.Outgoing;

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

    public void Deserialize(byte[] data)
    {
        throw new NotSupportedException();
    }

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

        // Character Data
        for (var i = 0; i < Characters.Length; i++)
        {
            var character = Characters[i];
            BinaryPrimitives.WriteInt32LittleEndian(data.Slice(21, 4), i);
            Encoding.ASCII.GetBytes(character.Name, data.Slice(25 + (i * 132), 16));

            // Job Data
            data[41 + (i * 132)] = character.Job.FirstJob;
            data[42 + (i * 132)] = character.Job.SecondJob;
            data[43 + (i * 132)] = character.Job.ThirdJob;
            data[44 + (i * 132)] = character.Job.FourthJob;

            data[45 + (i * 132)] = character.Gender;
            data[46 + (i * 132)] = character.Level;
            data[47 + (i * 132)] = character.Unknown;
            data[48 + (i * 132)] = (byte)character.Experience;

            // Stats
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(49 + (i * 132), 2), character.Stats.Strength);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(51 + (i * 132), 2), character.Stats.Dexterity);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(53 + (i * 132), 2), character.Stats.Intelligence);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(55 + (i * 132), 2), character.Stats.Vitality);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(57 + (i * 132), 2), character.Stats.Luck);
            BinaryPrimitives.WriteInt16LittleEndian(data.Slice(59 + (i * 132), 2), character.Stats.Wisdom);

            BinaryPrimitives.WriteInt32LittleEndian(data.Slice(61 + (i * 132), 4), character.Health);
            BinaryPrimitives.WriteInt32LittleEndian(data.Slice(65 + (i * 132), 4), character.Mana);

            for (var j = 0; j < 20; j++)
            {
                // Equipped Items
                BinaryPrimitives.WriteUInt16LittleEndian(data.Slice(69 + (i * 132) + (j * 2), 2),
                    character.EquippedItems[j] ?? 0);

                // Equipped Cash Items
                BinaryPrimitives.WriteUInt16LittleEndian(data.Slice(109 + (i * 132) + (j * 2), 2),
                    character.EquippedCashItems[j] ?? 0);
            }
        }

        return data.ToArray();
    }
}