"""
CityObject module
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2020 Project Author Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
"""
from pathlib import Path
from typing import List, Union
from city_model_structure.attributes.surface import Surface
from helpers.geometry_helper import GeometryHelper
from city_model_structure.attributes.polyhedron import Polyhedron
import math


class CityObject:
  """
  class CityObject
  """
  def __init__(self, lod, surfaces, name):
    self._name = name
    self._lod = lod
    self._surfaces = surfaces
    self._polyhedron = None
    self._geometry = GeometryHelper()

  @property
  def lod(self):
    """
    City object level of detail 1, 2, 3 or 4
    :return: int
    """
    lod = math.log(self._lod, 2) + 1
    return lod

  @property
  def volume(self):
    """
    City object volume in cubic meters
    :return: float
    """
    return self.polyhedron.volume

  @property
  def polyhedron(self):
    """
    City object polyhedron
    :return: Polyhedron
    """
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    return self._polyhedron

  @property
  def surfaces(self) -> List[Surface]:
    """
    City object surfaces
    :return: [Surface]
    """
    return self._surfaces

  def surface(self, name) -> Union[Surface, None]:
    """
    Get the city object surface with a given name
    :param name: str
    :return: None or Surface
    """
    for s in self.surfaces:
      if s.name == name:
        return s
    return None

  @property
  def location(self):
    """
    City object location
    :return: [x,y,z]
    """
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    return self._polyhedron.center

  def stl_export(self, path):
    """
    Export the city object to stl file (city_object_name.stl) to the given path
    :param path: str
    :return: None
    """
    # todo: this is a method just for debugging, it will be soon removed
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    full_path = (Path(path) / (self._name + '.stl')).resolve()
    self._polyhedron.stl_export(full_path)

  def obj_export(self, path):
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    full_path = (Path(path) / (self._name + '.obj')).resolve()
    self._polyhedron.obj_export(full_path)

  def show(self):
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    self._polyhedron.show()

  @property
  def max_height(self):
    """
    City object maximal height in meters
    :return: float
    """
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    return self._polyhedron.max_z