Geyser/connector/src/main/java/org/geysermc/connector/network/translators/bedrock/BedrockBlockEntityDataTranslator.java

/*
 * Copyright (c) 2019-2020 GeyserMC. http://geysermc.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author GeyserMC
 * @link https://github.com/GeyserMC/Geyser
 */

package org.geysermc.connector.network.translators.bedrock;

import com.github.steveice10.mc.protocol.data.game.entity.metadata.Position;
import com.github.steveice10.mc.protocol.packet.ingame.client.world.ClientUpdateSignPacket;
import com.nukkitx.nbt.tag.CompoundTag;
import com.nukkitx.protocol.bedrock.packet.BlockEntityDataPacket;
import org.geysermc.connector.network.session.GeyserSession;
import org.geysermc.connector.network.translators.PacketTranslator;
import org.geysermc.connector.network.translators.Translator;

import java.util.HashMap;
import java.util.Map;

@Translator(packet = BlockEntityDataPacket.class)
public class BedrockBlockEntityDataTranslator extends PacketTranslator<BlockEntityDataPacket> {

    // In case two people are editing signs at the same time this array holds the temporary messages to be sent
    // Position -> Message being held
    protected static Map<Position, String> lastMessages = new HashMap<>();

    @Override
    public void translate(BlockEntityDataPacket packet, GeyserSession session) {
        if (packet.getData() instanceof CompoundTag) {
            CompoundTag tag = (CompoundTag) packet.getData();
            if (tag.getString("id").equals("Sign")) {
                // This is the reason why this all works - Bedrock sends packets every time you update the sign, Java only wants the final packet
                // But Bedrock sends one final packet when you're done editing the sign, which should be equal to the last message since there's no edits
                // So if the latest update does not match the last cached update then it's still being edited
                Position pos = new Position(tag.getInt("x"), tag.getInt("y"), tag.getInt("z"));
                if (!tag.getString("Text").equals(lastMessages.get(pos))) {
                    lastMessages.put(pos, tag.getString("Text"));
                    return;
                }
                // Otherwise the two messages are identical and we can get to work deconstructing
                StringBuilder newMessage = new StringBuilder();
                // While Bedrock's sign lines are one string, Java's is an array of each line
                // (Initialized all with empty strings because it complains about null)
                String[] lines = new String[] {"", "", "", ""};
                int iterator = 0;
                // This converts the message into the array'd message Java wants
                for (char character : tag.getString("Text").toCharArray()) {
                    // If we get a return in Bedrock, that signals to use the next line.
                    if (character == '\n') {
                        lines[iterator] = newMessage.toString();
                        iterator++;
                        // Bedrock, for whatever reason, can hold a message out of bounds
                        // We don't care about that so we discard that
                        if (iterator > lines.length - 1) {
                            break;
                        }
                        newMessage = new StringBuilder();
                    } else newMessage.append(character);
                }
                // Put the final line on since it isn't done in the for loop
                if (iterator < lines.length) lines[iterator] = newMessage.toString();
                ClientUpdateSignPacket clientUpdateSignPacket = new ClientUpdateSignPacket(pos, lines);
                session.sendDownstreamPacket(clientUpdateSignPacket);
                //TODO (potentially): originally I was going to update the sign blocks so Bedrock and Java users would match visually
                // However Java can still store a lot per-line and visuals are still messed up so that doesn't work

                // We remove the sign position from map to indicate there is no work-in-progress sign
                lastMessages.remove(pos);
            }
        }

    }
}