refactor: separate action system responsibilities

simulation/actions/ActionTargetResolver.gd

@@ -0,0 +1,60 @@
+class_name ActionTargetResolver
+extends RefCounted
+
+func resolve(
+	npc: SimNPC,
+	origin: Vector3,
+	simulation_manager: Node,
+	active_world_adapter: Node
+) -> Dictionary:
+	var definition := SimulationDefinitions.get_action(npc.current_task)
+	if definition == null:
+		return {}
+	match definition.target_type:
+		SimulationIds.TARGET_RESOURCE:
+			return _resolve_resource(
+				npc, origin, definition, simulation_manager,
+				active_world_adapter
+			)
+		SimulationIds.TARGET_ACTIVITY:
+			return active_world_adapter.get_activity_target(npc.current_task)
+		SimulationIds.TARGET_FREE:
+			return {
+				"target_id": "",
+				"position": origin + simulation_manager.get_wander_offset(npc.id)
+			}
+	return {}
+
+func _resolve_resource(
+	npc: SimNPC,
+	origin: Vector3,
+	definition: ActionDefinition,
+	simulation_manager: Node,
+	active_world_adapter: Node
+) -> Dictionary:
+	var best: Dictionary = {}
+	var best_distance := INF
+	for candidate in active_world_adapter.get_resource_candidates(
+		definition.resource_action_id
+	):
+		var node_id := StringName(candidate["target_id"])
+		var state: ResourceStateRecord = simulation_manager.get_resource_state(
+			node_id
+		)
+		if (
+			state == null
+			or not state.can_npc_use()
+			or not state.is_available_for(npc.id)
+		):
+			continue
+		var position: Vector3 = candidate["position"]
+		var distance := origin.distance_squared_to(position)
+		if distance < best_distance:
+			best_distance = distance
+			best = candidate
+	if best.is_empty():
+		return {}
+	var target_id := StringName(best["target_id"])
+	if not simulation_manager.reserve_resource(target_id, npc.id):
+		return {}
+	return best