public class StarlightWeaponBeam implements BeamEffectPlugin {

    private IntervalUtil fireInterval = new IntervalUtil(0.2f, 0.3f);
    private boolean wasZero = true;

    public void advance(float amount, CombatEngineAPI engine, BeamAPI beam) {
        CombatEntityAPI target = beam.getDamageTarget();
        if (target instanceof ShipAPI && beam.getBrightness() >= 1f) {
            float dur = beam.getDamage().getDpsDuration();
            if (!wasZero) dur = 0;
            wasZero = beam.getDamage().getDpsDuration() <= 0;
            fireInterval.advance(dur);
            if (fireInterval.intervalElapsed()) {
                ShipAPI ship = (ShipAPI) target;
                boolean hitShield = target.getShield() != null && target.getShield().isWithinArc(beam.getTo());
                float pierceChance = ((ShipAPI) target).getHardFluxLevel() - 0.1f;
                pierceChance *= ship.getMutableStats().getDynamic().getValue(Stats.SHIELD_PIERCED_MULT);

                boolean piercedShield = hitShield && (float) Math.random() < pierceChance;

                if (!hitShield || piercedShield) {
                    Vector2f dir = Vector2f.sub(beam.getTo(), beam.getFrom(), new Vector2f());
                    if (dir.lengthSquared() > 0) dir.normalise();
                    dir.scale(50f);
                    Vector2f point = Vector2f.sub(beam.getTo(), dir, new Vector2f());
                    float emp = beam.getWeapon().getDamage().getFluxComponent() * 0.5f;
                    float dam = beam.getWeapon().getDamage().getDamage() * 0.25f;
                    engine.spawnEmpArcPierceShields(
                            beam.getSource(), point, beam.getDamageTarget(), beam.getDamageTarget(),
                            DamageType.ENERGY,
                            dam, // damage
                            emp, // emp
                            100000f, // max range
                            "tachyon_lance_emp_impact",
                            beam.getWidth() + 5f,
                            beam.getFringeColor(),
                            beam.getCoreColor()
                    );
                }
            }
        }
    }
}