# 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
import ifcopenshell.util.element


def copy_material(file: ifcopenshell.file, material: ifcopenshell.entity_instance) -> ifcopenshell.entity_instance:
    """Copies a material or material set

    All material psets and styles are copied. The copied material is not
    associated to any elements.

    If a material set is copied, the set items are also copied. However the
    underlying materials (and profiles) used within the set items are reused.

    If a material is associated with a presentation style, that presentation
    style is reused.

    :param material: The IfcMaterialDefinition to copy
    :return: The new copy of the material

    Example:

    .. code:: python

        concrete = ifcopenshell.api.material.add_material(model, name="CON01", category="concrete")

        # Let's duplicate the concrete material
        concrete_copy = ifcopenshell.api.material.copy_material(model, material=concrete)
    """
    if material.is_a("IfcMaterial"):
        return _copy_material_with_inverses(file, material)
    elif material.is_a("IfcMaterialConstituentSet"):
        new = _copy_material_with_inverses(file, material)
        new.MaterialConstituents = [copy_material(file, i) for i in material.MaterialConstituents]
        return new
    elif material.is_a("IfcMaterialConstituent"):
        return _copy_material_with_inverses(file, material)
    elif material.is_a("IfcMaterialLayerSet"):
        new = _copy_material_with_inverses(file, material)
        new.MaterialLayers = [copy_material(file, i) for i in material.MaterialLayers]
        return new
    elif material.is_a("IfcMaterialLayer"):
        return _copy_material_with_inverses(file, material)
    elif material.is_a("IfcMaterialProfileSet"):
        new = _copy_material_with_inverses(file, material)
        new.MaterialProfiles = [copy_material(file, i) for i in material.MaterialProfiles]
        return new
    elif material.is_a("IfcMaterialProfile"):
        return _copy_material_with_inverses(file, material)
    elif material.is_a("IfcMaterialList"):
        return _copy_material_with_inverses(file, material)
    else:
        raise Exception(f"Unexpected material type: '{material.is_a()}' ({material}).")


def _copy_material_with_inverses(
    file: ifcopenshell.file, material: ifcopenshell.entity_instance
) -> ifcopenshell.entity_instance:
    new = ifcopenshell.util.element.copy(file, material)
    for inverse in file.get_inverse(material):
        if inverse.is_a("IfcMaterialProperties"):
            # Properties must not be shared between objects for convenience of authoring
            inverse = ifcopenshell.util.element.copy(file, inverse)
            inverse.Material = new

            props_attribute = "Properties"
            if file.schema == "IFC2X3":
                if not inverse.is_a("IfcExtendedMaterialProperties"):
                    continue
                props_attribute = "ExtendedProperties"

            props = getattr(inverse, props_attribute)
            if not props:
                continue

            copied_props = []
            for pset in props:
                copied_props.append(ifcopenshell.util.element.copy_deep(file, pset))
            setattr(inverse, props_attribute, copied_props)

        elif inverse.is_a("IfcMaterialDefinitionRepresentation"):
            inverse = ifcopenshell.util.element.copy_deep(
                file, inverse, exclude=["IfcRepresentationContext", "IfcMaterial", "IfcPresentationStyle"]
            )
            inverse.RepresentedMaterial = new
    return new