package net.minecraft.network.protocol.game;

import java.util.ArrayList;
import java.util.List;
import net.minecraft.network.RegistryFriendlyByteBuf;
import net.minecraft.network.codec.StreamCodec;
import net.minecraft.network.protocol.Packet;
import net.minecraft.network.protocol.PacketType;
import net.minecraft.network.syncher.SynchedEntityData;

public record ClientboundSetEntityDataPacket(int id, List<SynchedEntityData.DataValue<?>> packedItems) implements Packet<ClientGamePacketListener> {
	public static final StreamCodec<RegistryFriendlyByteBuf, ClientboundSetEntityDataPacket> STREAM_CODEC = Packet.codec(
		ClientboundSetEntityDataPacket::write, ClientboundSetEntityDataPacket::new
	);
	public static final int EOF_MARKER = 255;

	private ClientboundSetEntityDataPacket(RegistryFriendlyByteBuf buffer) {
		this(buffer.readVarInt(), unpack(buffer));
	}

	private static void pack(List<SynchedEntityData.DataValue<?>> dataValues, RegistryFriendlyByteBuf buffer) {
		for (SynchedEntityData.DataValue<?> dataValue : dataValues) {
			dataValue.write(buffer);
		}

		buffer.writeByte(255);
	}

	private static List<SynchedEntityData.DataValue<?>> unpack(RegistryFriendlyByteBuf buffer) {
		List<SynchedEntityData.DataValue<?>> list = new ArrayList();

		int i;
		while ((i = buffer.readUnsignedByte()) != 255) {
			list.add(SynchedEntityData.DataValue.read(buffer, i));
		}

		return list;
	}

	private void write(RegistryFriendlyByteBuf buffer) {
		buffer.writeVarInt(this.id);
		pack(this.packedItems, buffer);
	}

	@Override
	public PacketType<ClientboundSetEntityDataPacket> type() {
		return GamePacketTypes.CLIENTBOUND_SET_ENTITY_DATA;
	}

	/**
	 * Passes this Packet on to the NetHandler for processing.
	 */
	public void handle(ClientGamePacketListener handler) {
		handler.handleSetEntityData(this);
	}
}