# 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/>.


class Usecase:
    def __init__(self, file, role=None):
        """Removes a role

        People and organisations using the role will be untouched. This may
        leave some of them without roles.

        :param role: The IfcActorRole to remove.
        :type role: ifcopenshell.entity_instance.entity_instance
        :return: None
        :rtype: None

        Example:

        .. code:: python

            organisation = ifcopenshell.api.run("owner.add_organisation", model,
                identification="AWB", name="Architects Without Ballpens")
            role = ifcopenshell.api.run("owner.add_role", model, assigned_object=organisation, role="ARCHITECT")

            # After running this, the organisation will have no role again
            ifcopenshell.api.run("owner.remove_role", model, role=role)
        """
        self.file = file
        self.settings = {"role": role}

    def execute(self):
        for inverse in self.file.get_inverse(self.settings["role"]):
            if inverse.is_a() in ("IfcOrganization", "IfcPerson", "IfcPersonAndOrganization"):
                if inverse.Roles == (self.settings["role"],):
                    inverse.Roles = None
            elif inverse.is_a("IfcResourceLevelRelationship") and not inverse.is_a("IfcOrganizationRelationship"):
                if inverse.RelatedResourceObjects == (self.settings["organisation"],):
                    self.file.remove(inverse)
        self.file.remove(self.settings["role"])