package net.minecraft.network.protocol.game;

import java.util.Objects;
import net.minecraft.network.FriendlyByteBuf;
import net.minecraft.network.codec.StreamCodec;
import net.minecraft.network.protocol.Packet;
import net.minecraft.network.protocol.PacketType;
import net.minecraft.world.scores.DisplaySlot;
import net.minecraft.world.scores.Objective;
import org.jetbrains.annotations.Nullable;

public class ClientboundSetDisplayObjectivePacket implements Packet<ClientGamePacketListener> {
	public static final StreamCodec<FriendlyByteBuf, ClientboundSetDisplayObjectivePacket> STREAM_CODEC = Packet.codec(
		ClientboundSetDisplayObjectivePacket::write, ClientboundSetDisplayObjectivePacket::new
	);
	private final DisplaySlot slot;
	private final String objectiveName;

	public ClientboundSetDisplayObjectivePacket(DisplaySlot slot, @Nullable Objective objective) {
		this.slot = slot;
		if (objective == null) {
			this.objectiveName = "";
		} else {
			this.objectiveName = objective.getName();
		}
	}

	private ClientboundSetDisplayObjectivePacket(FriendlyByteBuf buffer) {
		this.slot = buffer.readById(DisplaySlot.BY_ID);
		this.objectiveName = buffer.readUtf();
	}

	/**
	 * Writes the raw packet data to the data stream.
	 */
	private void write(FriendlyByteBuf buffer) {
		buffer.writeById(DisplaySlot::id, this.slot);
		buffer.writeUtf(this.objectiveName);
	}

	@Override
	public PacketType<ClientboundSetDisplayObjectivePacket> type() {
		return GamePacketTypes.CLIENTBOUND_SET_DISPLAY_OBJECTIVE;
	}

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

	public DisplaySlot getSlot() {
		return this.slot;
	}

	@Nullable
	public String getObjectiveName() {
		return Objects.equals(this.objectiveName, "") ? null : this.objectiveName;
	}
}