"""
Plane module
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2020 Project Author Pilar Monsalvete Alvarez de Uribarri pilar.monsalvete@concordia.ca
"""

from typing import TypeVar
import numpy as np

Point = TypeVar('Point')


class Plane:
  """
  Plane class
  """

  def __init__(self, origin=None, normal=None):
    # todo: other options to define the plane:
    #  by two lines
    #  by three points
    self._origin = origin
    self._normal = normal
    self._opposite_normal = None

  @property
  def origin(self) -> Point:
    """
    Get plane origin point
    :return: Point
    """
    if self._origin is None:
      raise NotImplementedError
    return self._origin

  @property
  def normal(self):
    """
    Get plane normal [x, y, z]
    :return: np.ndarray
    """
    if self._normal is None:
      raise NotImplementedError
    return self._normal

  @property
  def opposite_normal(self):
    """
    get plane normal in the opposite direction [x, y, z]
    :return: np.ndarray
    """
    if self._opposite_normal is None:
      coordinates = []
      for coordinate in self.normal:
        coordinates.append(-coordinate)
      self._opposite_normal = np.array(coordinates)
    return self._opposite_normal