"""
Geometry helper
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2020 Project Author Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
"""
import math
import numpy as np


class Geometry:
  def __init__(self, delta=0.5):
    self._delta = delta

  def almost_equal(self, v1, v2):
    delta = math.sqrt(pow((v1[0] - v2[0]), 2) + pow((v1[1] - v2[1]), 2) + pow((v1[2] - v2[2]), 2))
    return delta <= self._delta

  def is_almost_same_surface(self, s1, s2):
    # delta is grads an need to be converted into radians
    delta = np.rad2deg(self._delta)
    difference = (s1.inclination - s2.inclination) % math.pi
    if abs(difference) > delta:
      return False
    # s1 and s2 are at least almost parallel surfaces
    # calculate distance point to plane using all the vertex
    # select surface1 value for the point (X,Y,Z) where two of the values are 0
    minimum_distance = self._delta + 1
    parametric = s2.polygon.get_parametric()
    n2 = s2.normal
    for point in s1.points:
      distance = abs(
        (point[0] * parametric[0]) + (point[1] * parametric[1]) + (point[2] * parametric[2]) + parametric[3])
      normal_module = math.sqrt(pow(n2[0], 2) + pow(n2[1], 2) + pow(n2[2], 2))

      if normal_module == 0:
        continue
      distance = distance / normal_module
      if distance < minimum_distance:
        minimum_distance = distance
      if minimum_distance <= self._delta:
        break
    if minimum_distance > self._delta or s1.intersect(s2) is None:
      return False
    else:
      return True

  @staticmethod
  def to_points_matrix(points, remove_last=False):
    rows = points.size // 3
    points = points.reshape(rows, 3)
    if remove_last:
      points = np.delete(points, rows - 1, 0)
    return points