feat: define action completion costs

simulation/actions/ActionSelectionSystem.gd

@@ -182,9 +182,13 @@ func _choose_best_work_action(npc: SimNPC, village: SimVillage, all_npcs: Array)
 			0.75
 		)
 	}
-	if village.wood < 1.0:
-		scores[SimulationIds.ACTION_PATROL] = UNAVAILABLE_ACTION_SCORE
-		scores[SimulationIds.ACTION_STUDY] = UNAVAILABLE_ACTION_SCORE
+	var rejections := {}
+	for action_id in scores:
+		var definition := SimulationDefinitions.get_action(action_id)
+		var rejection := _get_cost_rejection(definition, village)
+		if not rejection.is_empty():
+			scores[action_id] = UNAVAILABLE_ACTION_SCORE
+			rejections[action_id] = rejection
 	for familiar_id in npc.familiarity:
 		if not familiar_id is int:
 			continue
@@ -205,10 +209,32 @@ func _choose_best_work_action(npc: SimNPC, village: SimVillage, all_npcs: Array)
 			best_action = action_id
 			best_score = score
 	return ActionSelectionResult.new(
-		best_action, -1.0, "Highest current work utility", scores
+		best_action, -1.0, "Highest current work utility", scores, rejections
 	)
 
 
+func _get_cost_rejection(definition: ActionDefinition, village: SimVillage) -> String:
+	if definition == null or not definition.has_completion_cost():
+		return ""
+	var available := _get_village_resource_amount(village, definition.completion_cost_resource_id)
+	if available >= definition.completion_cost_amount:
+		return ""
+	return "Needs %.0f %s (%.1f available)" % [
+		definition.completion_cost_amount,
+		String(definition.completion_cost_resource_id).capitalize(),
+		available,
+	]
+
+
+func _get_village_resource_amount(village: SimVillage, resource_id: StringName) -> float:
+	match resource_id:
+		SimulationIds.RESOURCE_FOOD:
+			return village.food
+		SimulationIds.RESOURCE_WOOD:
+			return village.wood
+	return 0.0
+
+
 func _calculate_score(
 	npc: SimNPC,
 	action_id: StringName,