Made building consume resources

Now may build more than one if resources allow
building placement is red/green for indicating success

scripts/autoloads/resource_manager.gd

@@ -1,4 +1,4 @@
-
+extends Node
 signal changed_resource
 
 @export var resources := {}
@@ -10,6 +10,29 @@ func _on_gained_resource(res: GameResource) -> void:
 	}
 	changed_resource.emit(ResourceChangedSignal.new(changed_resources))
 
+func pickup(resource: GameResource) -> void:
+	if not resources.has(resource):
+		resources[resource] = 0
+	resources[resource] += resource.pickup_value
+	var changed_resources := {
+		resource: resource.pickup_value
+	}
+	changed_resource.emit(ResourceChangedSignal.new(changed_resources))
+
+func has_amount(res: GameResource, amount: int) -> bool:
+	return resources[res] >= amount if resources.has(res) else false
+	
+func has_resources(cost: Dictionary) -> bool:
+	return cost.keys().reduce(func(accum, res): return accum and has_amount(res, cost[res]), true)
+	
+func use_resources(cost: Dictionary) -> void:
+	var changed_resources := {
+	}
+	for res in cost.keys():
+		resources[res] -= cost[res]
+		changed_resources[res] = -cost[res]
+	changed_resource.emit(ResourceChangedSignal.new(changed_resources))
+
 #func _on_timer_timeout() -> void:
 	#var corrupted_resources := Grid.get_corrupted_resources()
 	#if corrupted_resources.size() > 0: