# 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_list_item(
    file: ifcopenshell.file, material_list: ifcopenshell.entity_instance, material_index: int = 0
) -> None:
    """Removes an item in an material list

    Note that it is invalid to have zero items in a list, so you should leave
    at least one item to ensure a valid IFC dataset.

    :param material_list: The IfcMaterialList entity you want to remove an
        item from.
    :param material_index: The index of the material you want to remove from
        the list. Starts counting at 0. Defaults to 0.
    :return: None

    Example:

    .. code:: python

        # Create a material list for aluminium windows.
        material_set = ifcopenshell.api.material.add_material_set(model,
            name="Window", set_type="IfcMaterialMaterialList")

        aluminium = ifcopenshell.api.material.add_material(model, name="AL01", category="aluminium")
        glass = ifcopenshell.api.material.add_material(model, name="GLZ01", category="glass")

        # Now let's use those materials as two items in our list.
        ifcopenshell.api.material.add_list_item(model, material_list=material_set, material=aluminium)
        ifcopenshell.api.material.add_list_item(model, material_list=material_set, material=glass)

        # Let's remove the glass
        ifcopenshell.api.material.remove_list_item(model, material_list=material_set, material_index=1)
    """
    materials = list(material_list.Materials)
    materials.pop(material_index)
    material_list.Materials = materials
