"""
CityGml module parses citygml files and import the geometry into the city model structure
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2020 Project Author Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
"""
import numpy as np
import xmltodict

from city_model_structure.city import City
from city_model_structure.building import Building
from helpers.geometry_helper import GeometryHelper
from imports.geometry.citygml_lod2 import CityGmlLod2
from imports.geometry.citygml_lod1 import CityGmlLod1
from city_model_structure.parts_consisting_building import PartsConsistingBuilding


class CityGml:
  """
  CityGml class
  """
  def __init__(self, path):
    self._city = None
    self._lod1_tags = ['lod1Solid', 'lod1MultiSurface']
    self._lod2_tags = ['lod2Solid', 'lod2MultiSurface', 'lod2MultiCurve']
    with open(path) as gml:
      # Clean the namespaces is an important task to prevent wrong ns:field due poor citygml implementations
      fl = ('cityObjectMember', 'curveMember', 'boundedBy', 'surfaceMember', 'consistsOfBuildingPart')
      self._gml = xmltodict.parse(gml.read(), process_namespaces=True, xml_attribs=True, namespaces={
        'http://www.opengis.net/gml': None,
        'http://www.opengis.net/citygml/1.0': None,
        'http://www.opengis.net/citygml/building/1.0': None,
        'http://schemas.opengis.net/citygml/building/1.0/building.xsd': None,
        'http://www.opengis.net/citygml/appearance/1.0': None,
        'http://schemas.opengis.net/citygml/appearance/1.0/appearance.xsd': None,
        'http://www.opengis.net/citygml/relief/1.0': None,
        'http://schemas.opengis.net/citygml/relief/1.0/relief.xsd': None,
        'http://www.opengis.net/citygml/generics/1.0': None,
        'http://www.w3.org/2001/XMLSchema-instance': None,
        'urn:oasis:names:tc:ciq:xsdschema:xAL:2.0': None,
        'http://www.w3.org/1999/xlink': None,
        'http://www.opengis.net/citygml/relief/2.0': None,
        'http://www.opengis.net/citygml/building/2.0': None,
        'http://www.opengis.net/citygml/building/2.0 http://schemas.opengis.net/citygml/building/2.0/building.xsd '
        'http://www.opengis.net/citygml/relief/2.0 http://schemas.opengis.net/citygml/relief/2.0/relief.xsd" '
        'xmlns="http://www.opengis.net/citygml/2.0': None,
        'http://www.opengis.net/citygml/2.0': None
      }, force_list=fl)

      self._city_objects = None
      self._geometry = GeometryHelper()
      for bound in self._gml['CityModel']['boundedBy']:
        envelope = bound['Envelope']
        if '#text' in envelope['lowerCorner']:
          self._lower_corner = np.fromstring(envelope['lowerCorner']['#text'], dtype=float, sep=' ')
          self._upper_corner = np.fromstring(envelope['upperCorner']['#text'], dtype=float, sep=' ')
        else:
          self._lower_corner = np.fromstring(envelope['lowerCorner'], dtype=float, sep=' ')
          self._upper_corner = np.fromstring(envelope['upperCorner'], dtype=float, sep=' ')
        if '@srsName' in envelope:
          self._srs_name = envelope['@srsName']

  @property
  def content(self):
    """
    CityGml raw content
    :return: str
    """
    return self._gml

  def _create_building(self, city_object):
    name = city_object['@id']
    function = None
    year_of_construction = None
    if 'yearOfConstruction' in city_object:
      year_of_construction = city_object['yearOfConstruction']
    if 'function' in city_object:
      function = city_object['function']
    if any(key in city_object for key in self._lod1_tags):
      lod = 1
      surfaces = CityGmlLod1(city_object).surfaces
    elif any(key in city_object for key in self._lod2_tags):
      lod = 2
      surfaces = CityGmlLod2(city_object).surfaces
    else:
      raise NotImplementedError("Not supported level of detail")
    return Building(name, lod, surfaces, year_of_construction, function, self._lower_corner, [])

  def _create_parts_consisting_building(self, city_object):
    name = city_object['@id']
    building_parts = []
    for part in city_object['consistsOfBuildingPart']:
      building = self._create_building(part['BuildingPart'])
      print(f'add city building part {building.name}')
      self._city.add_city_object(building)
      building_parts.append(building)
    print(f'add building cluster {name}')
    return PartsConsistingBuilding(name, building_parts)

  @property
  def city(self) -> City:
    """
    City model structure enriched with the geometry information
    :return: City
    """

    if self._city is None:
      self._city = City(self._lower_corner, self._upper_corner, self._srs_name)
      for o in self._gml['CityModel']['cityObjectMember']:
        city_object = o['Building']
        if 'consistsOfBuildingPart' in city_object:
          print('create building parts')
          self._city.add_city_objects_cluster(self._create_parts_consisting_building(city_object))
        else:
          self._city.add_city_object(self._create_building(city_object))
    return self._city