Save budget for filling whole packages.

No sense filling airbases with cheap escorts if we'll never afford the
rest of the package. Filling the airbases with cheap escorts also makes
it impossible to buy the rest of the package when the faction eventually
does have the money since there's nowhere to park the needed aircraft.

https://github.com/dcs-liberation/dcs_liberation/issues/1058

changelog.md

@@ -16,6 +16,7 @@ Saves from 2.5 are not compatible with 3.0.
 
 * **[Campaign AI]** Fixed bug causing AI to over-purchase cheap aircraft.
 * **[Campaign AI]** Auto planner will no longer attempt to plan missions for which the faction has no compatible aircraft.
+* **[Campaign AI]** Stop purchasing aircraft after the first unaffordable package to attempt to complete more packages rather than filling airfields with cheap escorts that will never be used.
 
 # 2.5.1
 

game/procurement.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 import math
 import random
 from dataclasses import dataclass
-from typing import Iterator, List, Optional, TYPE_CHECKING, Type
+from typing import Iterator, List, Optional, TYPE_CHECKING, Tuple, Type
 
 from dcs.unittype import FlyingType, VehicleType
 
@@ -194,7 +194,7 @@ class ProcurementAi:
 
     def fulfill_aircraft_request(
         self, request: AircraftProcurementRequest, budget: float
-    ) -> float:
+    ) -> Tuple[float, bool]:
         for airbase in self.best_airbases_for(request):
             unit = self.affordable_aircraft_for(request, airbase, budget)
             if unit is None:
@@ -207,12 +207,22 @@ class ProcurementAi:
 
             budget -= db.PRICES[unit] * request.number
             airbase.pending_unit_deliveries.order({unit: request.number})
-            break
-        return budget
+            return budget, True
+        return budget, False
 
     def purchase_aircraft(self, budget: float) -> float:
         for request in self.game.procurement_requests_for(self.is_player):
-            budget = self.fulfill_aircraft_request(request, budget)
+            if not list(self.best_airbases_for(request)):
+                # No airbases in range of this request. Skip it.
+                continue
+            budget, fulfilled = self.fulfill_aircraft_request(request, budget)
+            if not fulfilled:
+                # The request was not fulfilled because we could not afford any suitable
+                # aircraft. Rather than continuing, which could proceed to buy tons of
+                # cheap escorts that will never allow us to plan a strike package, stop
+                # buying so we can save the budget until a turn where we *can* afford to
+                # fill the package.
+                break
         return budget
 
     @property