// An idle rotor or zero speed alone is normal during takeoff, landing and reload.
// Confirm prolonged grounding, but recognize actual loss of flight capability.
class ERR_HelicopterAvailability
{
	protected float m_fGroundedSince = -1;

	string Check(float now, float spawnedAt, bool destroyed, bool disabled, bool livingPilot, bool playerControlled, bool servicing, float height, float speed)
	{
		if (destroyed) return "destroyed";
		if (now - spawnedAt < 20000)
		{
			m_fGroundedSince = -1;
			return "";
		}
		if (disabled) return "engine, rotor or airframe disabled";
		if (playerControlled)
		{
			m_fGroundedSince = -1;
			return "";
		}
		if (!livingPilot) return "no living pilot";
		if (servicing || height > 5 || speed > 2)
		{
			m_fGroundedSince = -1;
			return "";
		}
		if (m_fGroundedSince < 0) m_fGroundedSince = now;
		if (now - m_fGroundedSince >= 60000) return "grounded for 60 seconds";
		return "";
	}
}