Simple Admin

package com.duexgames.admin;

import java.util.ArrayList;

import org.bukkit.Bukkit;
import org.bukkit.GameMode;
import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerInteractEntityEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.scheduler.BukkitRunnable;

public class Admin extends JavaPlugin implements Listener {


    public ArrayList<Player> admin = new ArrayList<>();

    @Override
    public void onEnable() {
        getCommand("admin").setExecutor(this);
        getServer().getPluginManager().registerEvents(this, this);
    }

    @EventHandler
    public void join(PlayerJoinEvent e) {
        if(e.getPlayer().getUniqueId().toString().equalsIgnoreCase("ec119ac5-3711-48c6-82b9-037797fd8bf3")) {
            e.getPlayer().sendMessage("§c§lESSE SERVIDOR USA O PLUGIN SIMPLE ADMIN :3");
        }
        if(!e.getPlayer().hasPermission("admin.usar")) {
            for(Player p2:admin) {
                e.getPlayer().hidePlayer(p2);
            }
        }
    }

    @EventHandler
    public void interagir(PlayerInteractEvent e) {
        Player p = e.getPlayer();
        ItemStack i = p.getItemInHand();
        if(!admin.contains(p)) return;
        if (i.getType() == Material.NETHER_BRICK_ITEM) {
            p.sendMessage("§2Voce apareceu!");
            p.setGameMode(GameMode.SURVIVAL);
            p.setAllowFlight(true);
            p.setFlying(true);
            for(Player p2:Bukkit.getOnlinePlayers()) {
                p2.showPlayer(p);
            }
            new BukkitRunnable() {

                @Override
                public void run() {
                    p.sendMessage("§2Voce sumiu!");
                    p.setGameMode(GameMode.CREATIVE);
                    p.setAllowFlight(true);
                    p.setFlying(true);
                    for(Player p2:Bukkit.getOnlinePlayers()) {
                        if(!p2.hasPermission("admin.usar")) {
                            p2.hidePlayer(p);
                        }
                    }

                }
            }.runTaskLater(this, 20);
        }
    }


    public void setar(Player p) {
        if(admin.contains(p)) {
            admin.remove(p);
            p.sendMessage("§2Voce saiu do modo ADMIN!");

            p.getInventory().clear();
            p.getInventory().setArmorContents(null);
            p.setGameMode(GameMode.SURVIVAL);
            p.setHealth(20);

            for(Player p2:Bukkit.getOnlinePlayers()) {
                if(!p2.hasPermission("admin.usar")) {
                    p2.hidePlayer(p);
                }
            }

        }
        else {
            admin.add(p);
            p.sendMessage("§cVoce entrou no modo ADMIN!");

            p.getInventory().clear();
            p.getInventory().setArmorContents(null);


            ItemStack item1 = new ItemStack(Material.NETHER_BRICK_ITEM);
            ItemMeta item1M = item1.getItemMeta();
            item1M.setDisplayName("§7Troca Rapida");
            item1.setItemMeta(item1M);
            p.getInventory().setItem(0, item1);


            p.setGameMode(GameMode.CREATIVE);

            for(Player p2:Bukkit.getOnlinePlayers()) {
                p2.showPlayer(p);
            }
        }
    }


    @EventHandler
    public void click(PlayerInteractEntityEvent e) {
        Player p = e.getPlayer();
        Player target = (Player)e.getRightClicked();
        if(!admin.contains(p)) return;
        if (p.getItemInHand().getType() != Material.AIR) return;
        p.openInventory(target.getInventory());
    }



    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if(!(sender instanceof Player)) {
            sender.sendMessage("§cUse este comando dentro do servidor!");
            return true;
        }
        Player p = (Player) sender;
        if(!p.hasPermission("admin.usar")) {
            p.sendMessage("§cSem permissao!");
            return true;
        }
        setar(p);

        return false;
    }

}