BauSystem/BauSystem_Main/src/de/steamwar/bausystem/commands/CommandTPSLimiter.java

package de.steamwar.bausystem.commands;

import de.steamwar.bausystem.BauSystem;
import net.md_5.bungee.api.ChatMessageType;
import net.md_5.bungee.api.chat.TextComponent;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Particle;
import org.bukkit.World;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.entity.TNTPrimed;

public class CommandTPSLimiter implements CommandExecutor {

    private static int currentTPSLimit = 20;
    private static World world = Bukkit.getWorlds().get(0);
    private long lastTime = System.currentTimeMillis();
    private long currentTime = System.currentTimeMillis();

    public CommandTPSLimiter() {
        Bukkit.getScheduler().runTaskTimer(BauSystem.getPlugin(), () -> {
            lastTime = currentTime;
            currentTime = System.currentTimeMillis();

            long timeDelta = currentTime - lastTime;
            long neededDelta = 1000 / currentTPSLimit;

            if (neededDelta - timeDelta < 1) {
                return;
            }

            try {
                Thread.sleep(neededDelta - timeDelta);
                currentTime = System.currentTimeMillis();
            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }, 0, 1);
        Bukkit.getScheduler().runTaskTimer(BauSystem.getPlugin(), () -> {
           if (currentTPSLimit == 20) {
               return;
           }

           world.getEntities().stream().filter(entity -> entity instanceof TNTPrimed).forEach(entity -> {
               Location location = entity.getLocation();
               world.spawnParticle(Particle.BARRIER, location.getX(), location.getY() + 0.49, location.getZ(), 1);
           });
        }, 0, 1);
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (!(sender instanceof Player)) {
            return false;
        } else if (args.length == 0) {
            sender.sendMessage(BauSystem.PREFIX + "Jetziges TPS limit: " + currentTPSLimit);
            sender.sendMessage(BauSystem.PREFIX + "Ändere das TPS limit mit: §8/§etpslimit §8[§7TPS§8|§edefault§8]");
            return false;
        }
        Player player = (Player) sender;

        String tpsLimit = args[0];
        if (tpsLimit.equals("default")) {
            currentTPSLimit = 20;
            sendNewTPSLimitMessage(player);
            return false;
        }

        try {
            int tpsLimitInt = Integer.parseInt(tpsLimit);
            if (tpsLimitInt < 1 || tpsLimitInt > 20) {
                sendInvalidArgumentMessage(player);
                return false;
            }
            currentTPSLimit = tpsLimitInt;
            sendNewTPSLimitMessage(player);
        } catch (NumberFormatException e) {
            sendInvalidArgumentMessage(player);
        }

        return false;
    }

    private void sendNewTPSLimitMessage(Player player) {
        player.sendMessage(BauSystem.PREFIX + "TPS limit auf " + currentTPSLimit + " gesetzt.");
        Bukkit.getOnlinePlayers().forEach(p -> p.spigot().sendMessage(ChatMessageType.ACTION_BAR, TextComponent.fromLegacyText("§eTPS limit auf " + currentTPSLimit + " gesetzt.")));
    }

    private void sendInvalidArgumentMessage(Player player) {
        player.sendMessage(BauSystem.PREFIX + "Nur Zahlen zwischen 1 und 20, und 'default' erlaubt.");
    }

    public static int getCurrentTPSLimit() {
        return currentTPSLimit;
    }

}