# 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_role(file: ifcopenshell.file, role: ifcopenshell.entity_instance) -> 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.
    :return: None

    Example:

    .. code:: python

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

        # After running this, the organisation will have no role again
        ifcopenshell.api.owner.remove_role(model, role=role)
    """
    for inverse in file.get_inverse(role):
        if inverse.is_a() in ("IfcOrganization", "IfcPerson", "IfcPersonAndOrganization"):
            if inverse.Roles == (role,):
                inverse.Roles = None
        elif inverse.is_a("IfcResourceLevelRelationship"):
            # IfcResourceConstraintRelationship or other rels with IfcResourceObjectSelect.
            if inverse.RelatedResourceObjects == (role,):
                file.remove(inverse)
    file.remove(role)