Minestom/src/main/java/net/minestom/server/network/packet/server/play/TabCompletePacket.java

package net.minestom.server.network.packet.server.play;

import net.kyori.adventure.text.Component;
import net.minestom.server.adventure.ComponentHolder;
import net.minestom.server.network.packet.server.ComponentHoldingServerPacket;
import net.minestom.server.network.packet.server.ServerPacket;
import net.minestom.server.network.packet.server.ServerPacketIdentifier;
import net.minestom.server.utils.binary.BinaryReader;
import net.minestom.server.utils.binary.BinaryWriter;
import net.minestom.server.utils.binary.Writeable;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.function.UnaryOperator;

public record TabCompletePacket(int transactionId, int start, int length,
                                @NotNull List<Match> matches) implements ComponentHoldingServerPacket {
    public TabCompletePacket {
        matches = List.copyOf(matches);
    }

    public TabCompletePacket(BinaryReader reader) {
        this(reader.readVarInt(), reader.readVarInt(), reader.readVarInt(), reader.readVarIntList(Match::new));
    }

    @Override
    public void write(@NotNull BinaryWriter writer) {
        writer.writeVarInt(transactionId);
        writer.writeVarInt(start);
        writer.writeVarInt(length);
        writer.writeVarIntList(matches, BinaryWriter::write);
    }

    @Override
    public int getId() {
        return ServerPacketIdentifier.TAB_COMPLETE;
    }

    @Override
    public @NotNull Collection<Component> components() {
        if (matches.isEmpty()) return List.of();
        List<Component> components = new ArrayList<>(matches.size());
        for (Match match : matches) {
            if (match.tooltip != null) {
                components.add(match.tooltip);
            }
        }
        return components;
    }

    @Override
    public @NotNull ServerPacket copyWithOperator(@NotNull UnaryOperator<Component> operator) {
        if (matches.isEmpty()) return this;
        final List<Match> updatedMatches = matches.stream().map(match -> match.copyWithOperator(operator)).toList();
        return new TabCompletePacket(transactionId, start, length, updatedMatches);

    }

    public record Match(@NotNull String match,
                        @Nullable Component tooltip) implements Writeable, ComponentHolder<Match> {
        public Match(BinaryReader reader) {
            this(reader.readSizedString(), reader.readBoolean() ? reader.readComponent() : null);
        }

        @Override
        public void write(@NotNull BinaryWriter writer) {
            writer.writeSizedString(match);
            writer.writeBoolean(tooltip != null);
            if (tooltip != null) writer.writeComponent(tooltip);
        }

        @Override
        public @NotNull Collection<Component> components() {
            return tooltip != null ? List.of(tooltip) : List.of();
        }

        @Override
        public @NotNull Match copyWithOperator(@NotNull UnaryOperator<Component> operator) {
            return tooltip != null ? new Match(match, operator.apply(tooltip)) : this;
        }
    }
}