secreterproject/src/main/java/net/pivipi/LoginHandler.java

package net.pivipi;

import net.minestom.server.coordinate.Pos;
import net.minestom.server.entity.GameMode;
import net.minestom.server.entity.Player;
import net.minestom.server.entity.attribute.Attribute;
import net.minestom.server.event.GlobalEventHandler;
import net.minestom.server.event.player.AsyncPlayerConfigurationEvent;
import net.minestom.server.event.player.PlayerDisconnectEvent;
import net.minestom.server.event.player.PlayerSpawnEvent;
import net.minestom.server.instance.Instance;
import net.pivipi.ball.Ball;
import net.pivipi.ball.BallKicker;
import net.pivipi.world.Stadium;

public class LoginHandler {
    private final Instance spawningInstance;
    private final Stadium stadium = new Stadium();

    public LoginHandler(Instance spawningInstance) {
        this.spawningInstance = spawningInstance;
    }

    public void setup(GlobalEventHandler globalEventHandler) {
        globalEventHandler.addListener(AsyncPlayerConfigurationEvent.class, event -> onLogin(event));
        globalEventHandler.addListener(PlayerDisconnectEvent.class, event -> onQuit(event));
        globalEventHandler.addListener(PlayerSpawnEvent.class, event -> onSpawn(event));
        new BallKicker(stadium).setup(globalEventHandler);
    }

    private void onLogin(AsyncPlayerConfigurationEvent event) {
        Player player = event.getPlayer();

        event.setSpawningInstance(spawningInstance);
        event.setHardcore(true);

        player.setRespawnPoint(new Pos(5, 5, 0));
        stadium.players.add(player);
    }
    
    private void onQuit(PlayerDisconnectEvent event) {
    	stadium.players.remove(event.getPlayer());
    }

    private void onSpawn(PlayerSpawnEvent event) {
        Player player = event.getPlayer();

        player.setGameMode(GameMode.CREATIVE);
        player.getAttribute(Attribute.GENERIC_MOVEMENT_SPEED).setBaseValue(0.2);
        player.getAttribute(Attribute.GENERIC_JUMP_STRENGTH).setBaseValue(0.36813); // just enough to jump a block
        
        if (stadium.ball == null) {
            Ball ball = new Ball(stadium);
            ball.setInstance(event.getInstance());
            ball.teleport(new Pos(0, 15, 0));
            stadium.ball = ball;
        }
    }
}