public class Haemorrhage extends MobEffect {
    public int passiveDMGdelay = 50;
    public static DamageSource BLEEDING = new DamageSource("bleeding");

    public Haemorrhage(MobEffectCategory pCategory, int pColor) {
        super(pCategory, pColor);
    }

    @Override
    public boolean isDurationEffectTick(int pDuration, int pAmplifier) {
        passiveDMGdelay = Math.max(0, passiveDMGdelay - 1);
        return true;
    }

    @Override
    public void applyEffectTick(LivingEntity pLivingEntity, int pAmplifier) {
        float damage;
        // calculates player's horizontal movement speed
        double dx = pLivingEntity.getDeltaMovement().x();
        double dz = pLivingEntity.getDeltaMovement().z();
        double velocity = Math.sqrt(dx * dx + dz * dz);

        if (velocity == 0 || pLivingEntity.isCrouching()) {
            if (passiveDMGdelay == 0) {
                damage = 1F;
                pLivingEntity.hurt(BLEEDING, damage);
                passiveDMGdelay = Math.max(40, 80 - pAmplifier * 5);
            }
        } else if (velocity > 0) {
            damage = (float) ((pAmplifier * 0.25F + 1) * (pLivingEntity.isSprinting() && pLivingEntity.isOnGround() ? velocity * 50 : velocity * 20));
            pLivingEntity.hurt(BLEEDING, 2F);
            passiveDMGdelay = Math.max(25, 50 - pAmplifier * 5);
        }
    }
}