Attack detecting radars with low priority.

IADS that are in detection range (but not attack range) of missions will
be targeted at very low priority. These will typically only be planned
when no other targets are in range.

game/commander/tasks/compound/degradeiads.py

@@ -1,16 +1,24 @@
 from collections import Iterator
+from typing import Union
 
 from game.commander.tasks.primitive.antiship import PlanAntiShip
 from game.commander.tasks.primitive.dead import PlanDead
 from game.commander.theaterstate import TheaterState
 from game.htn import CompoundTask, Method
-from game.theater.theatergroundobject import IadsGroundObject
+from game.theater.theatergroundobject import IadsGroundObject, NavalGroundObject
 
 
 class DegradeIads(CompoundTask[TheaterState]):
     def each_valid_method(self, state: TheaterState) -> Iterator[Method[TheaterState]]:
         for air_defense in state.threatening_air_defenses:
-            if isinstance(air_defense, IadsGroundObject):
-                yield [PlanDead(air_defense)]
-            else:
-                yield [PlanAntiShip(air_defense)]
+            yield [self.plan_against(air_defense)]
+        for detector in state.detecting_air_defenses:
+            yield [self.plan_against(detector)]
+
+    @staticmethod
+    def plan_against(
+        target: Union[IadsGroundObject, NavalGroundObject]
+    ) -> Union[PlanDead, PlanAntiShip]:
+        if isinstance(target, IadsGroundObject):
+            return PlanDead(target)
+        return PlanAntiShip(target)