import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Location;
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.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.event.block.BlockPlaceEvent;
import org.bukkit.event.player.AsyncPlayerChatEvent;
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;
import org.bukkit.util.Vector;

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

public class CaptchaPlugin extends JavaPlugin implements Listener, CommandExecutor {

    private Map<Player, String> captchaMap = new HashMap<>();

    @Override
    public void onEnable() {
        getServer().getPluginManager().registerEvents(this, this);
        getCommand(“register”).setExecutor(this);
    }

    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent event) {
        Player player = event.getPlayer();

        // Teleport player to specified coordinates
        World world = Bukkit.getWorld(“world”);
        Location location = new Location(world, 0, 99999999, 0);
        player.teleport(location);

        // Make player invulnerable
        player.setInvulnerable(true);

        // Disable command input
        player.setOp(false);

        // Disable block breaking and placing
        player.getInventory().clear();
        player.setCanPickupItems(false);
    }

    @EventHandler
    public void onBlockBreak(BlockBreakEvent event) {
        event.setCancelled(true);
    }

    @EventHandler
    public void onBlockPlace(BlockPlaceEvent event) {
        event.setCancelled(true);
    }

    @EventHandler
    public void onPlayerChat(AsyncPlayerChatEvent event) {
        Player player = event.getPlayer();
        String message = event.getMessage();

        // Check if player is in captcha
        if (captchaMap.containsKey(player)) {
            event.setCancelled(true);
            String captcha = captchaMap.get(player);

            // Check entered captcha
            if (message.equalsIgnoreCase(captcha)) {
                // Correct captcha, ask player to register or login
                player.sendMessage(ChatColor.GREEN + “Captcha is correct! Enter password to register or login.”);

                // Add player to enter password in next chat
                captchaMap.put(player, “password”);
            } else {
                // Incorrect captcha, give another chance
                player.sendMessage(ChatColor.RED + “Incorrect captcha! Please try again.”);
            }

            return;
        }

        // Check if player is entering password
        if (captchaMap.containsValue(“password”)) {
            event.setCancelled(true);

            // Check if entered password is correct
            if (message.equals(getPassword(player))) {
                player.sendMessage(ChatColor.GREEN + “Password is correct! You are registered or logged in.”);

                // Password is correct, remove player from captchaMap
                captchaMap.remove(player, “password”);
            } else {
                player.kickPlayer(ChatColor.RED + “Incorrect password! Please try again.”);
            }
        }
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (command.getName().equalsIgnoreCase(“register”)) {
            if (sender instanceof Player) {
                Player player = (Player) sender;

                // Check if player is already registered
                if (isRegistered(player)) {
                    player.sendMessage(ChatColor.RED + “You are already registered!”);
                    return true;
                }

                // Generate and display captcha
                String captcha = generateCaptcha();
                captchaMap.put(player, captcha);
                displayCaptcha(player, captcha);

                player.sendMessage(ChatColor.GREEN + “Please enter the captcha in chat.”);

            } else {
                sender.sendMessage(ChatColor.RED + “You must be a player to use this command.”);
            }

            return true;
        }

        return false;
    }

    private String generateCaptcha() {
        // Generate a random captcha
        // Here, you can use any method or libraries for captcha generation
        return “captcha”; // Here’s an example - always “captcha”
    }

    private void displayCaptcha(Player player, String captcha) {
        // Display captcha in player’s screen center
        player.spigot().sendMessage(ChatMessageType.ACTION_BAR, new TextComponent(ChatColor.YELLOW + "Captcha: " + captcha));
    }

    private boolean isRegistered(Player player) {
        // Check if player is registered in password.yml file
        // Here, you should use code to read data from password.yml file and check player’s presence
        // Return the respective result
        return false; // Here’s an example - player is not registered
    }

    private String getPassword(Player player) {
        // Get player’s password from password.yml file
        // Here, you should use code to read data from password.yml file and get player’s password
        // Return the respective result
        return “password”; // Here’s an example - always “password”
    }
} Допиши код