Add slider option for weighted AI procurement

Resolves #81

game/procurement.py

@@ -73,13 +73,15 @@ class ProcurementAi:
             cp_aircraft = cp.allocated_aircraft()
             aircraft_investment += cp_aircraft.total_value
 
-        total_investment = aircraft_investment + armor_investment
-        if total_investment == 0:
+        air = self.game.settings.auto_procurement_balance / 100.0
+        ground = 1 - air
+        weighted_investment = aircraft_investment * air + armor_investment * ground
+        if weighted_investment == 0:
             # Turn 0 or all units were destroyed. Either way, split 30/70.
-            return 0.3
+            return min(0.3, ground)
 
         # the more planes we have, the more ground units we want and vice versa
-        ground_unit_share = aircraft_investment / total_investment
+        ground_unit_share = aircraft_investment * air / weighted_investment
         if ground_unit_share > 1.0:
             raise ValueError
 

game/settings/settings.py

@@ -273,6 +273,19 @@ class Settings:
         HQ_AUTOMATION_SECTION,
         default=True,
     )
+    auto_procurement_balance: int = bounded_int_option(
+        "AI ground unit procurement budget ratio (%)",
+        CAMPAIGN_MANAGEMENT_PAGE,
+        HQ_AUTOMATION_SECTION,
+        min=0,
+        max=100,
+        default=50,
+        detail=(
+            "Ratio (larger number -> more budget for ground units) "
+            "that indicates how the AI procurement planner should "
+            "spend its budget."
+        ),
+    )
     reserves_procurement_target: int = 10
 
     # Mission Generator