# 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.util.representation


class Usecase:
    def __init__(self, file, material_profile=None, profile=None):
        """Changes the profile curve of a material profile item in a profile set

        In addition to changing the profile curve, it will also change the
        profile curve used in any body representation extrusions.

        :param material_profile: The IfcMaterialProfile to change the profile
            curve of. See ifcopenshell.api.material.add_profile to see how to
            create profiles.
        :type material_profile: ifcopenshell.entity_instance.entity_instance
        :param profile: The IfcProfileDef to set the profile item's curve to.
        :type profile: ifcopenshell.entity_instance.entity_instance
        :return: None
        :rtype: None

        Example:

        .. code:: python

            # Let's imagine we have a steel I-beam. Notice we are assigning to
            # the type only, as all occurrences of that type will automatically
            # inherit the material.
            beam_type = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBeamType", name="B1")

            # First, let's create a material set. This will later be assigned
            # to our beam type element.
            material_set = ifcopenshell.api.run("material.add_profile_set", model,
                name="B1", set_type="IfcMaterialProfileSet")

            # Create a steel material.
            steel = ifcopenshell.api.run("material.add_material", model, name="ST01", category="steel")

            # Create an I-beam profile curve. Notice how we name our profiles
            # based on standardised steel profile names.
            hea100 = self.file.create_entity(
                "IfcIShapeProfileDef", ProfileName="HEA100", ProfileType="AREA",
                OverallWidth=100, OverallDepth=96, WebThickness=5, FlangeThickness=8, FilletRadius=12,
            )

            # Define that steel material and cross section as a single profile
            # item. If this were a composite beam, we might add multiple profile
            # items instead, but this is rarely the case in most construction.
            profile_item = ifcopenshell.api.run("material.add_profile", model,
                profile_set=material_set, material=steel, profile=hea100)

            # Great! Let's assign our material set to our beam type.
            ifcopenshell.api.run("material.assign_material", model, product=beam_type, material=material_set)

            # Let's create an occurrence of this beam.
            beam = ifcopenshell.api.run("root.create_entity", model, ifc_class="IfcBeam", name="B1.01")
            ifcopenshell.api.run("material.assign_material", model,
                product=beam, type="IfcMaterialProfileSetUsage")

            # Let's give a 1000mm long beam body representation.
            body = ifcopenshell.api.run("geoemtry.add_profile_representation",
                context=body_context, profile=hea100, depth=1000)
            ifcopenshell.api.run("geometry.assign_representation", model, product=beam, representation=body)
            ifcopenshell.api.run("geometry.edit_object_placement", model, product=beam)

            # Now let's change the profile to a HEA200 standard profile instead.
            # This will automatically change the body representation that we
            # just added as well to a HEA200 profile.
            hea200 = self.file.create_entity(
                "IfcIShapeProfileDef", ProfileName="HEA200", ProfileType="AREA",
                OverallWidth=200, OverallDepth=190, WebThickness=6.5, FlangeThickness=10, FilletRadius=18,
            )
            ifcopenshell.api.run("material.assign_profile", model, material_profile=profile_item, profile=hea200)
        """
        self.file = file
        self.settings = {"material_profile": material_profile, "profile": profile}

    def execute(self):
        # TODO: handle composite profiles
        old_profile = self.settings["material_profile"].Profile
        self.settings["material_profile"].Profile = self.settings["profile"]
        for profile_set in self.settings["material_profile"].ToMaterialProfileSet:
            for inverse in self.file.get_inverse(profile_set):
                if not inverse.is_a("IfcMaterialProfileSetUsage"):
                    continue
                if self.file.schema == "IFC2X3":
                    for rel in self.file.get_inverse(inverse):
                        if not rel.is_a("IfcRelAssociatesMaterial"):
                            continue
                        for element in rel.RelatedObjects:
                            self.change_profile(element)
                else:
                    for rel in inverse.AssociatedTo:
                        for element in rel.RelatedObjects:
                            self.change_profile(element)

        if old_profile and len(self.file.get_inverse(old_profile)) == 0:
            self.file.remove(old_profile)

    def change_profile(self, element):
        representation = ifcopenshell.util.representation.get_representation(element, "Model", "Body", "MODEL_VIEW")
        if not representation:
            return
        for subelement in self.file.traverse(representation):
            if subelement.is_a("IfcSweptAreaSolid"):
                subelement.SweptArea = self.settings["profile"]