import ifcopenshell.api


class Usecase:
    def __init__(self, file, **settings):
        self.file = file
        self.settings = {"cost_item": None, "products": []}
        for key, value in settings.items():
            self.settings[key] = value

    def execute(self):
        self.quantities = set(self.settings["cost_item"].CostQuantities or [])
        for quantity in self.settings["cost_item"].CostQuantities or []:
            for inverse in self.file.get_inverse(quantity):
                if not inverse.is_a("IfcElementQuantity"):
                    continue
                for rel in inverse.DefinesOccurrence or []:
                    for related_object in rel.RelatedObjects:
                        if related_object in self.settings["products"]:
                            self.quantities.remove(quantity)
        self.settings["cost_item"].CostQuantities = list(self.quantities)

        for product in self.settings["products"]:
            ifcopenshell.api.run(
                "control.unassign_control",
                self.file,
                related_object=product,
                relating_control=self.settings["cost_item"],
            )