# IfcOpenShell - IFC toolkit and geometry engine
# Copyright (C) 2022 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.unit
from math import sin, cos
from typing import Optional, Union, Any
from ifcopenshell.util.data import Clipping


def add_wall_representation(
    file: ifcopenshell.file,
    context: ifcopenshell.entity_instance,  # IfcGeometricRepresentationContext
    # all lengths are in meters
    length: float = 1.0,
    height: float = 3.0,
    offset: float = 0.0,
    thickness: float = 0.2,
    # Sloped walls along the wall's X axis, provided in radians
    x_angle: float = 0.0,
    # A list of planes that define clipping half space solids
    # Planes are defined either by Clipping objects
    # or by dictionaries of arguments for `Clipping.parse`
    clippings: Optional[list[Union[Clipping, dict[str, Any]]]] = None,
    # Any existing IfcBooleanResults
    booleans: Optional[list[ifcopenshell.entity_instance]] = None,
) -> ifcopenshell.entity_instance:
    usecase = Usecase()
    usecase.file = file
    usecase.settings = {
        "context": context,
        "length": length,
        "height": height,
        "offset": offset,
        "thickness": thickness,
        "x_angle": x_angle,
        "clippings": clippings if clippings is not None else [],
        "booleans": booleans if booleans is not None else [],
    }
    return usecase.execute()


class Usecase:
    def execute(self):
        self.settings["unit_scale"] = ifcopenshell.util.unit.calculate_unit_scale(self.file)
        self.settings["clippings"] = [Clipping.parse(c) for c in self.settings["clippings"]]
        return self.file.createIfcShapeRepresentation(
            self.settings["context"],
            self.settings["context"].ContextIdentifier,
            "Clipping" if self.settings["clippings"] or self.settings["booleans"] else "SweptSolid",
            [self.create_item()],
        )

    def create_item(self):
        length = self.convert_si_to_unit(self.settings["length"])
        thickness = self.convert_si_to_unit(self.settings["thickness"])
        thickness *= 1 / cos(self.settings["x_angle"])
        points = (
            (0.0, 0.0),
            (0.0, thickness),
            (length, thickness),
            (length, 0.0),
            (0.0, 0.0),
        )
        if self.file.schema == "IFC2X3":
            curve = self.file.createIfcPolyline([self.file.createIfcCartesianPoint(p) for p in points])
        else:
            curve = self.file.createIfcIndexedPolyCurve(self.file.createIfcCartesianPointList2D(points), None, False)
        if self.settings["x_angle"]:
            extrusion_direction = self.file.createIfcDirection(
                (0.0, sin(self.settings["x_angle"]), cos(self.settings["x_angle"]))
            )
        else:
            extrusion_direction = self.file.createIfcDirection((0.0, 0.0, 1.0))
        extrusion = self.file.createIfcExtrudedAreaSolid(
            self.file.createIfcArbitraryClosedProfileDef("AREA", None, curve),
            self.file.createIfcAxis2Placement3D(
                self.file.createIfcCartesianPoint((0.0, self.convert_si_to_unit(self.settings["offset"]), 0.0)),
                self.file.createIfcDirection((0.0, 0.0, 1.0)),
                self.file.createIfcDirection((1.0, 0.0, 0.0)),
            ),
            extrusion_direction,
            self.convert_si_to_unit(self.settings["height"]) * (1 / cos(self.settings["x_angle"])),
        )
        if self.settings["booleans"]:
            extrusion = self.apply_booleans(extrusion)
        if self.settings["clippings"]:
            extrusion = self.apply_clippings(extrusion)
        return extrusion

    def apply_booleans(self, first_operand):
        while self.settings["booleans"]:
            boolean = self.settings["booleans"].pop()
            boolean.FirstOperand = first_operand
            first_operand = boolean
        return first_operand

    def apply_clippings(self, first_operand):
        while self.settings["clippings"]:
            clipping = self.settings["clippings"].pop()
            if isinstance(clipping, ifcopenshell.entity_instance):
                new = ifcopenshell.util.element.copy(self.file, clipping)
                new.FirstOperand = first_operand
                first_operand = new
            else:  # Clipping
                first_operand = clipping.apply(self.file, first_operand, self.settings["unit_scale"])
        return first_operand

    def convert_si_to_unit(self, co):
        return co / self.settings["unit_scale"]