# IfcOpenShell - IFC toolkit and geometry engine
# Copyright (C) 2025 Thomas Krijnen <thomas@aecgeeks.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.api.alignment
import math

import numpy as np

import ifcopenshell
import ifcopenshell.geom
import ifcopenshell.guid
import ifcopenshell.template
from ifcopenshell import entity_instance
from ifcopenshell import ifcopenshell_wrapper
import ifcopenshell.util
import ifcopenshell.util.alignment


def evaluate_representation(shape_rep: entity_instance, dist_along: float) -> np.ndarray:
    """
    Calculate the 4x4 geometric transform at a point on an alignment segment

    :param shape_rep: The representation shape (composite curve, gradient curve, or segmented reference curve) to evaluate
    :param dist_along: The distance along this representation at the point of interest (point to be calculated)
    """
    supported_rep_types = ["IFCCOMPOSITECURVE", "IFCGRADIENTCURVE", "IFCSEGMENTEDREFERENCECURVE"]
    shape_rep_type = shape_rep.is_a().upper()
    if not shape_rep_type in supported_rep_types:
        raise NotImplementedError(
            f"Expected entity type to be one of {[_ for _ in supported_rep_types]}, got '{shape_rep_type}"
        )

    # TODO: confirm point is not beyond limits of alignment

    s = ifcopenshell.geom.settings()
    function_item = ifcopenshell_wrapper.map_shape(s, shape_rep.wrapped_data)
    evaluator = ifcopenshell_wrapper.function_item_evaluator(s, function_item)

    trans_matrix = evaluator.evaluate(dist_along)

    return np.array(trans_matrix, dtype=np.float64).T


def evaluate_segment(segment: entity_instance, dist_along: float) -> np.ndarray:
    """
    Calculate the 4x4 geometric transform at a point on an alignment segment

    :param segment: The segment containing the point that we would like to
    :param dist_along: The distance along this segment at the point of interest (point to be calculated)
    """
    supported_segment_types = ["IFCCURVESEGMENT"]
    segment_type = segment.is_a().upper()
    if not segment_type in supported_segment_types:
        raise NotImplementedError(f"Expected entity type 'IFCCURVESEGMENT', got '{segment_type}")
    if dist_along > segment.SegmentLength:
        raise ValueError(f"Provided value {dist_along=} is beyond the end of the segment ({segment.SegmentLength}).")

    s = ifcopenshell.geom.settings()
    function_item = ifcopenshell_wrapper.map_shape(s, segment.wrapped_data)
    evaluator = ifcopenshell_wrapper.function_item_evaluator(s, function_item)

    trans_matrix = evaluator.evaluate(dist_along)

    return np.array(trans_matrix, dtype=np.float64).T


def generate_vertices(rep_curve: entity_instance, distance_interval: float = 5.0) -> np.ndarray:
    """
    Generate vertices along an alignment

    :param rep_curve: The alignment's representation curve to use to generate vertices.
    :param distance_interval: The distance between points along the alignment at which to generate the points
    """
    if rep_curve is None:
        raise ValueError("Alignment representation not found.")

    supported_rep_types = ["IFCCOMPOSITECURVE", "IFCGRADIENTCURVE", "IFCSEGMENTEDREFERENCECURVE"]
    shape_rep_type = rep_curve.is_a().upper()
    if not shape_rep_type in supported_rep_types:
        raise NotImplementedError(
            f"Expected entity type to be one of {[_ for _ in supported_rep_types]}, got '{shape_rep_type}"
        )

    s = ifcopenshell.geom.settings()
    s.set("piecewise-step-type", 0)  # 0 = step-size is maximum step size, 1 = step-size is mininimum number of steps
    s.set("piecewise-step-size", distance_interval)
    shape = ifcopenshell.geom.create_shape(s, rep_curve)
    vertices = shape.verts
    if len(vertices) == 0:
        msg = f"[ERROR] No vertices generated by ifcopenshell.geom.create_shape()."
        raise ValueError(msg)
    return np.array(vertices).reshape((-1, 3))


def print_alignment(alignment, indent=0):
    """
    Debugging function to print alignment decomposition
    """
    print(" " * indent, alignment)

    for rel in alignment.IsNestedBy:
        for child in rel.RelatedObjects:
            print_alignment(child, indent + 2)

    for agg in alignment.IsDecomposedBy:
        for child in agg.RelatedObjects:
            print_alignment(child, indent + 2)


def print_alignment_deep(alignment, indent=0):
    """
    Debugging function to print alignment decomposition, including layout segments
    """
    print(" " * indent, alignment)

    for rel in alignment.IsNestedBy:
        for child in rel.RelatedObjects:
            print_alignment_deep(child, indent + 2)
            if child.is_a("IfcAlignmentSegment"):
                print(" " * (indent + 4), child.DesignParameters)

    for agg in alignment.IsDecomposedBy:
        for child in agg.RelatedObjects:
            print_alignment_deep(child, indent + 2)


def print_composite_curve(curve):
    """
    Debugging function to print composite curve segments
    """
    print(str(curve)[0:100])

    for segment in curve.Segments:
        print(" " * 2, segment)


def print_composite_curve_deep(curve):
    """
    Debugging function to print composite curve segments, including curve segment details
    """
    print(str(curve)[0:100])

    for segment in curve.Segments:
        print(" " * 2, segment)
        print(" " * 4, segment.ParentCurve)
        print(" " * 4, segment.Placement)
        print(" " * 4, segment.Placement.Location)
        print(" " * 4, segment.Placement.RefDirection)
