# IfcOpenShell - IFC toolkit and geometry engine
# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
#
# This file is part of IfcOpenShell.
#
# IfcOpenShell is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# IfcOpenShell is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
import ifcopenshell


def remove_metric(file: ifcopenshell.file, metric: ifcopenshell.entity_instance) -> None:
    """Remove a metric benchmark

    Removes a metric benchmark and all of its associations to any products
    and objectives.

    :param metric: The IfcMetric you want to remove.
    :type metric: ifcopenshell.entity_instance
    :return: None
    :rtype: None

    Example:

    .. code:: python

        objective = ifcopenshell.api.constraint.add_objective(model)
        metric = ifcopenshell.api.constraint.add_metric(model,
            objective=objective)
        ifcopenshell.api.constraint.remove_metric(model,
            metric=metric)
    """
    usecase = Usecase()
    usecase.file = file
    usecase.settings = {"metric": metric}
    return usecase.execute()


class Usecase:
    def execute(self):
        if self.settings["metric"].ReferencePath:
            reference = self.settings["metric"].ReferencePath
            self.delete_reference(reference)

        self.file.remove(self.settings["metric"])
        for rel in self.file.by_type("IfcRelAssociatesConstraint"):
            if not rel.RelatingConstraint:
                history = rel.OwnerHistory
                self.file.remove(rel)
                if history:
                    ifcopenshell.util.element.remove_deep2(self.file, history)
        for resource_rel in self.file.by_type("IfcResourceConstraintRelationship"):
            if not resource_rel.RelatingConstraint:
                self.file.remove(resource_rel)

    def delete_reference(self, reference):
        if reference.InnerReference:
            self.delete_reference(reference.InnerReference)
        self.file.remove(reference)
