SteamWar/BauSystem/BauSystem_21/src/de/steamwar/bausystem/utils/TickManager21.java

/*
 *   This file is a part of the SteamWar software.
 *
 *   Copyright (C) 2025 SteamWar.de-Serverteam
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *   GNU Affero General Public License for more details.
 *
 *   You should have received a copy of the GNU Affero General Public License
 *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package de.steamwar.bausystem.utils;

import com.comphenix.tinyprotocol.TinyProtocol;
import de.steamwar.Reflection;
import de.steamwar.bausystem.BauSystem;
import net.minecraft.network.protocol.game.ClientboundTickingStatePacket;
import net.minecraft.server.MinecraftServer;
import net.minecraft.server.ServerTickRateManager;
import net.minecraft.world.TickRateManager;
import org.bukkit.Bukkit;
import org.bukkit.entity.Player;

public class TickManager21 implements TickManager {
    private static final ServerTickRateManager manager = MinecraftServer.getServer().tickRateManager();
    private static final Reflection.Field<Integer> frozenTicksToRun = Reflection.getField(TickRateManager.class, int.class, 0);
    private static final Reflection.Field<Long> remainingSprintTicks = Reflection.getField(ServerTickRateManager.class, long.class, 0);

    private boolean blockTpsPacket = true;
    private int totalSteps;

    public TickManager21() {
        TinyProtocol.instance.addFilter(ClientboundTickingStatePacket.class, this::blockPacket);
    }

    private Object blockPacket(Player player, Object packet) {
        if (blockTpsPacket) {
            return new ClientboundTickingStatePacket(20, manager.isFrozen());
        } else {
            return packet;
        }
    }

    @Override
    public boolean canFreeze() {
        return true;
    }

    @Override
    public void setBlockTpsPacket(boolean block) {
        blockTpsPacket = block;
        if (blockTpsPacket) {
            ClientboundTickingStatePacket packet = new ClientboundTickingStatePacket(20, manager.isFrozen());
            Bukkit.getOnlinePlayers().forEach(player -> TinyProtocol.instance.sendPacket(player, packet));
        } else {
            ClientboundTickingStatePacket packet = new ClientboundTickingStatePacket(manager.tickrate(), manager.isFrozen());
            Bukkit.getOnlinePlayers().forEach(player -> TinyProtocol.instance.sendPacket(player, packet));
        }
    }

    @Override
    public void setTickRate(float tickRate) {
        if (isFrozen()) {
            setFreeze(false);
        }
        manager.setTickRate(tickRate);
    }

    @Override
    public boolean isFrozen() {
        return manager.isFrozen();
    }

    @Override
    public void setFreeze(boolean freeze) {
        manager.setFrozen(freeze);
    }

    @Override
    public void stepTicks(int ticks) {
        if (manager.isSprinting()) {
            manager.stopSprinting();
        } else if (manager.isSteppingForward()) {
            manager.stopStepping();
        }
        this.totalSteps = ticks;
        manager.setFrozen(true);
        manager.stepGameIfPaused(ticks);
        manager.setFrozen(false);
        Bukkit.getScheduler().runTaskTimer(BauSystem.getInstance(), (bukkitTask) -> {
            if (manager.isSteppingForward()) return;
            manager.setFrozen(true);
            bukkitTask.cancel();
        }, 1, 1);
        manager.tick();
    }

    @Override
    public void sprintTicks(int ticks) {
        if (manager.isSteppingForward()) {
            manager.stopStepping();
        } else if (manager.isSprinting()) {
            manager.stopSprinting();
        }
        this.totalSteps = ticks;
        manager.requestGameToSprint(ticks, true);
    }

    @Override
    public boolean isSprinting() {
        return manager.isSprinting();
    }

    @Override
    public boolean isStepping() {
        return manager.isSteppingForward();
    }

    @Override
    public float getTickRate() {
        return manager.tickrate();
    }

    @Override
    public long getRemainingTicks() {
        if (isSprinting()) {
            return remainingSprintTicks.get(manager);
        } else {
            return frozenTicksToRun.get(manager);
        }
    }

    @Override
    public long getDoneTicks() {
        return totalSteps - getRemainingTicks();
    }

    @Override
    public long getTotalTicks() {
        return totalSteps;
    }
}