FightSystem/FightSystem_Main/src/de/steamwar/fightsystem/utils/TechHider.java

package de.steamwar.fightsystem.utils;

import com.comphenix.protocol.PacketType;
import com.comphenix.protocol.ProtocolLibrary;
import com.comphenix.protocol.events.PacketAdapter;
import com.comphenix.protocol.events.PacketEvent;
import de.steamwar.core.Core;
import de.steamwar.fightsystem.Config;
import de.steamwar.fightsystem.FightSystem;
import javafx.util.Pair;
import org.bukkit.Bukkit;
import org.bukkit.GameMode;
import org.bukkit.entity.Player;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import static de.steamwar.fightsystem.utils.ITechHider.bypass;

public class TechHider {
    private TechHider(){}

    private static boolean running = false;

    public static void init(){
        if(disabled())
            return;

        if(Core.getVersion() > 8){
            ProtocolLibrary.getProtocolManager().addPacketListener(new PacketAdapter(FightSystem.getPlugin(), PacketType.Play.Client.USE_ITEM) {
                @Override
                public void onPacketReceiving(PacketEvent e) {
                    Player p = e.getPlayer();

                    if(p.getGameMode() == GameMode.SPECTATOR)
                        e.setCancelled(true);
                }
            });
        }
        ProtocolLibrary.getProtocolManager().addPacketListener(new PacketAdapter(FightSystem.getPlugin(), PacketType.Play.Client.USE_ENTITY) {
            @Override
            public void onPacketReceiving(PacketEvent e) {
                Player p = e.getPlayer();

                if(p.getGameMode() == GameMode.SPECTATOR)
                    e.setCancelled(true);
            }
        });
    }

    public static void start(){
        if(running)
            return;
        running = true;

        if(disabled())
            return;

        switch(Core.getVersion()){
            case 8:
                break;
            default:
                TechHider_12.start();
        }
    }

    public static List<Pair<Integer, Integer>> prepareChunkReload(Player p){
        if(disabled())
            return Collections.emptyList();
        List<Pair<Integer, Integer>> chunksToReload = new ArrayList<>();
        for(int x = ITechHider.arenaMinX; x <= ITechHider.arenaMaxX; x++)
            for(int z = ITechHider.arenaMinZ; z <= ITechHider.arenaMaxZ; z++)
                if(!bypass(p, x, z))
                    chunksToReload.add(new Pair<>(x, z));
        return chunksToReload;
    }

    public static void reloadChunks(Player p, List<Pair<Integer, Integer>> chunksToReload){
        if(disabled())
            return;
        Bukkit.getScheduler().runTaskLater(FightSystem.getPlugin(), () -> {
            for(Pair<Integer, Integer> chunk : chunksToReload){
                if(bypass(p, chunk.getKey(), chunk.getValue()))
                    reloadChunk(p, chunk);
            }
        }, 40);
    }

    private static void reloadChunk(Player p, Pair<Integer, Integer> chunk){
        switch(Core.getVersion()){
            case 8:
                TechHider_8.reloadChunk(p, chunk);
                break;
            default:
                TechHider_12.reloadChunk(p, chunk);
        }
    }

    private static boolean disabled(){
        return Config.OnlyPublicSchematics;
    }
}