import greenfoot.*;

public class Player extends Actor
{
    private int speed = 4;
    private int jumpStrength = 12;
    private int gravity = 1;
    
    private int verticalSpeed = 0;
    private boolean onGround = false;

    public void act()
    {
        moveLeftAndRight();
        jump();
        fall();
    }

    // Bewegung nach links und rechts
    private void moveLeftAndRight()
    {
        if (Greenfoot.isKeyDown("a"))
        {
            setLocation(getX() - speed, getY());
        }

        if (Greenfoot.isKeyDown("d"))
        {
            setLocation(getX() + speed, getY());
        }
    }

    // Springen
    private void jump()
    {
        if (Greenfoot.isKeyDown("space") && onGround)
        {
            verticalSpeed = -jumpStrength;
            onGround = false;
        }
    }

    // Schwerkraft und Boden-Kollision
    private void fall()
    {
        verticalSpeed += gravity;

        int newY = getY() + verticalSpeed;

        // Prüfen, ob wir auf Ground landen
        setLocation(getX(), newY);

        Actor ground = getOneIntersectingObject(Ground.class);

        if (ground != null)
        {
            // Wenn wir fallen, stehen wir auf dem Ground
            if (verticalSpeed >= 0)
            {
                int groundTop = ground.getY() - ground.getImage().getHeight() / 2;
                int characterHalfHeight = getImage().getHeight() / 2;

                setLocation(getX(), groundTop - characterHalfHeight);

                verticalSpeed = 0;
                onGround = true;
            }
        }
        else
        {
            onGround = false;
        }
    }
}