// Decisions consume detached HQ memory and delivered friendly check-ins only.
class ERR_AirSupportSituation
{
 int BeliefId;
 int Samples;
 int Spotted;
 int GroundFit;
 int CommittedFit;
 int ConfirmedLosses;
 float Age;
 float Confidence;
 float Radius;
 float Speed;
 bool MotionKnown;
 bool Infantry;
 bool AircraftReady;
 bool ArtilleryBusy;
}
class ERR_AirSupportPolicy
{
 int Candidate;
 float ConsideringSince = -1;
 float NextDrop;
 string Reason = "waiting for delivered intelligence";
 static string Refusal(ERR_AirSupportSituation s, bool checkAirspace = true)
 {
  if (!s || !s.AircraftReady) return "no ready helicopter passenger load";
  if (!ERR_HQMemoryRules.Finite(s.Age) || !ERR_HQMemoryRules.Finite(s.Confidence) || !ERR_HQMemoryRules.Finite(s.Radius) || !ERR_HQMemoryRules.Finite(s.Speed)) return "invalid memory sample";
  if (s.BeliefId <= 0 || s.Samples < 2 || s.Age < 0 || s.Age > 90 || s.Confidence < 0.7 || s.Confidence > 1 || s.Radius < 0 || s.Radius > 160) return "memory is too uncertain; continue reconnaissance";
  if (!s.Infantry || !s.MotionKnown || s.Speed < 0 || s.Speed > 6) return "target movement does not justify an infantry drop";
  int needed = Math.Clamp(s.Spotted * 2, 4, 12);
  if (s.CommittedFit >= needed) return "ground forces already committed in sufficient strength";
  if (s.GroundFit + s.CommittedFit >= needed && s.ConfirmedLosses < 2) return "nearby ground forces can handle this contact";
  if (checkAirspace && s.ArtilleryBusy) return "mortar order or shells occupy the approach area";
  return "";
 }
 bool Consider(ERR_AirSupportSituation s, float now)
 {
  if (!ERR_HQMemoryRules.Finite(now) || now < 0) return false;
  // Artillery temporarily closes the approach; it does not invalidate fresh
  // contact history or the confirmed lack of ground support. Restarting the
  // timer on every salvo could prevent a drop through every clear interval.
  string refusal = Refusal(s, false);
  if (!refusal.IsEmpty()) { Candidate = 0;
  ConsideringSince = -1;
  Reason = refusal;
  return false;
  }
  if (now < NextDrop) { Reason = "reinforcement cooldown; retain remaining troops";
  return false;
  }
  if (Candidate != s.BeliefId || ConsideringSince < 0) { Candidate = s.BeliefId;
  ConsideringSince = now;
  }
  if (s.ArtilleryBusy) { Reason = Refusal(s);
  return false;
  }
  float delay = 45000;
  if (s.ConfirmedLosses >= 2) delay = 20000;
  if (now - ConsideringSince < delay) { Reason = "confirming persistent contact and ground-force shortfall";
  return false;
  }
  Reason = "persistent infantry contact exceeds available ground response";
  return true;
 }
 void Committed(float now) { NextDrop = now + 480000;
  Candidate = 0;
  ConsideringSince = -1;
  }
 void Retry(float now) { NextDrop = Math.Max(NextDrop, now + 15000);
  Candidate = 0;
  ConsideringSince = -1;
  }
}

// One immutable authorization; receiver revalidates memory and physical safety.
class ERR_AirDropOrder
{
 int BeliefId;
 int BeliefRevision;
 int MessageId;
 vector Target;
 float ExpiresAt;
 ref ERR_HQReport Report;
}