"""
CityObject module
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2020 Project Author Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
"""
from typing import Union, List
from matplotlib import pylab
from city_model_structure.polyhedron import Polyhedron
from city_model_structure.thermal_zone import ThermalZone
from city_model_structure.thermal_boundary import ThermalBoundary
from city_model_structure.surface import Surface
from shapely import ops
from shapely.geometry import MultiPolygon
import numpy as np
from pathlib import Path
import matplotlib.patches as patches
from helpers.geometry import Geometry
from city_model_structure.usage_zone import UsageZone



class CityObject:
  """
  CityObject class
  """
  def __init__(self, name, lod, surfaces, terrains, year_of_construction, function, lower_corner, attic_heated=0,
               basement_heated=0):
    self._name = name
    self._lod = lod
    self._surfaces = surfaces
    self._polyhedron = None
    self._basement_heated = basement_heated
    self._attic_heated = attic_heated
    self._terrains = terrains
    self._year_of_construction = year_of_construction
    self._function = function
    self._lower_corner = lower_corner
    self._geometry = Geometry()
    self._average_storey_height = None
    self._storeys_above_ground = None
    self._foot_print = None
    self._usage_zones = []
    # ToDo: this need to be changed when we have other city_objects beside "buildings"
    self._type = 'building'

    # ToDo: Check this for LOD4
    self._thermal_zones = []
    if self.lod < 8:
      # for lod under 4 is just one thermal zone
      self._thermal_zones.append(ThermalZone(self.surfaces))

    for t in self._thermal_zones:
      t.bounded = [ThermalBoundary(s, [t]) for s in t.surfaces]
    surface_id = 0
    for surface in self._surfaces:
      surface.lower_corner = self._lower_corner
      surface.parent(self, surface_id)
      surface_id += 1

  @property
  def usage_zones(self) -> List[UsageZone]:
    """
    Get city object usage zones
    :return: [UsageZone]
    """
    return self._usage_zones

  @usage_zones.setter
  def usage_zones(self, values):
    """
    Set city objects usage zones
    :param values: [UsageZones]
    :return: None
    """
    # ToDo: this is only valid for one usage zone need to be revised for multiple usage zones.
    self._usage_zones = values
    for thermal_zone in self.thermal_zones:
      thermal_zone.usage_zones = [(100, usage_zone) for usage_zone in values]

  @property
  def terrains(self) -> List[Surface]:
    """
    Get city object terrain surfaces
    :return: [Surface]
    """
    return self._terrains

  @property
  def attic_heated(self):
    """
    Get if the city object attic is heated
    :return: Boolean
    """
    return self._attic_heated

  @attic_heated.setter
  def attic_heated(self, value):
    """
    Set if the city object attic is heated
    :param value: Boolean
    :return: None
    """
    self._attic_heated = value

  @property
  def basement_heated(self):
    """
    Get if the city object basement is heated
    :return: Boolean
    """
    return self._basement_heated

  @basement_heated.setter
  def basement_heated(self, value):
    """
    Set if the city object basement is heated
    :param value: Boolean
    :return: None
    """
    self._attic_heated = value

  @property
  def name(self):
    """
    City object name
    :return: str
    """
    return self._name

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

  @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: Surface name:str
    :return: None or Surface
    """
    for s in self.surfaces:
      if s.name == name:
        return s
    return None

  @property
  def thermal_zones(self) -> List[ThermalZone]:
    """
    City object thermal zones
    :return: [ThermalZone]
    """
    return self._thermal_zones

  @property
  def volume(self):
    """
    City object volume in cubic meters
    :return: float
    """
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    return self._polyhedron.volume

  @property
  def heated_volume(self):
    """
    City object heated volume in cubic meters
    :return: float
    """
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    # ToDo: this need to be the calculated based on the basement and attic heated values
    return self._polyhedron.volume

  def stl_export(self, path):
    """
    Export the city object to stl file (city_object_name.stl)
    :param path: path to export
    :return: None
    """
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    full_path = (Path(path) / (self._name + '.stl')).resolve()
    self._polyhedron.save(full_path)

  @property
  def year_of_construction(self):
    """
    City object year of construction
    :return: int
    """
    return self._year_of_construction

  @property
  def function(self):
    """
    City object function
    :return: str
    """
    return self._function

  @property
  def average_storey_height(self):
    """
    Get city object average storey height in meters
    :return: float
    """
    return self._average_storey_height

  @average_storey_height.setter
  def average_storey_height(self, value):
    """
    Set city object average storey height in meters
    :param value: average storey height in meters:float
    :return: None
    """
    self._average_storey_height = value

  @property
  def storeys_above_ground(self):
    return self._storeys_above_ground

  @storeys_above_ground.setter
  def storeys_above_ground(self, value):
    self._storeys_above_ground = value

  @staticmethod
  def _tuple_to_point(xy_tuple):
    return [xy_tuple[0], xy_tuple[1], 0.0]

  def _plot(self, polygon):
    points = ()
    for point_tuple in polygon.exterior.coords:
      almost_equal = False
      for point in points:
        point_1 = CityObject._tuple_to_point(point)
        point_2 = CityObject._tuple_to_point(point_tuple)
        if self._geometry.almost_equal(point_1, point_2):
          almost_equal = True
          break
      if not almost_equal:
        points = points + (point_tuple,)
    points = points + (points[0],)
    pylab.scatter([point[0] for point in points], [point[1] for point in points])
    pylab.gca().add_patch(patches.Polygon(points, closed=True, fill=True))
    pylab.grid()
    pylab.show()

  @property
  def foot_print(self) -> Surface:
    if self._foot_print is None:
      shapelys = []
      union = None
      for surface in self.surfaces:
        if surface.shapely.is_empty or not surface.shapely.is_valid:
          continue
        shapelys.append(surface.shapely)
        union = ops.unary_union(shapelys)
        shapelys = [union]
      if type(union) == MultiPolygon:
        Exception('foot print returns a multipolygon')
      points_list = []
      for point_tuple in union.exterior.coords:
        # ToDo: should be Z 0.0 or min Z?
        point = CityObject._tuple_to_point(point_tuple)
        almost_equal = False
        for existing_point in points_list:
          if self._geometry.almost_equal(point, existing_point):
            almost_equal = True
            break
        if not almost_equal:
          points_list.append(point)
      points_list = np.reshape(points_list, len(points_list) * 3)
      points = np.array_str(points_list).replace('[', '').replace(']', '')
      self._foot_print = Surface(points, remove_last=False, is_projected=True)
    return self._foot_print

  @property
  def type(self):
    return self._type

  @property
  def max_height(self):
    if self._polyhedron is None:
      self._polyhedron = Polyhedron(self.surfaces)
    return self._polyhedron.max_z