"""
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 city_model_structure.surface import Surface
from helpers.geometry_helper import GeometryHelper

class CityGml:
  """
  CityGml class
  """
  def __init__(self, path):
    self._city = None
    with open(path) as gml:
      # Clean the namespaces is an important task to prevent wrong ns:field due poor citygml implementations
      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=('cityObjectMember', 'curveMember', 'boundedBy', 'surfaceMember'))
      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=' ')

        self._srs_name = envelope['@srsName']

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

  @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)
      i = 0
      for o in self._gml['CityModel']['cityObjectMember']:
        i += 1
        lod = 0
        surfaces = []
        if 'lod1Solid' in o['Building']:
          lod += 1
          surfaces = self._lod1(o)
        else:
          for bound in o['Building']['boundedBy']:
            surface_type = next(iter(bound))
            if 'lod2MultiSurface' in bound[surface_type]:
              lod = 2
              surfaces = CityGml._lod2(bound)
            if 'lod3Solid' in o['Building']:
              lod += 4
            if 'lod4Solid' in o['Building']:
              lod += 8
        name = o['Building']['@id']
        lod_terrain_str = 'lod' + str(lod) + 'TerrainIntersection'
        terrains = []
        if lod_terrain_str in o['Building']:
          terrains = self._terrains(o, lod_terrain_str)

        year_of_construction = None
        function = None
        if 'yearOfConstruction' in o['Building']:
          year_of_construction = o['Building']['yearOfConstruction']
        if 'function' in o['Building']:
          function = o['Building']['function']
        self._city.add_city_object(Building(name, lod, surfaces, terrains, year_of_construction, function,
                                            self._lower_corner))
    return self._city

  def _terrains(self, city_object, lod_terrain_str):
    try:
      curves = [c['LineString']['posList']['#text']
                for c in city_object['Building'][lod_terrain_str]['MultiCurve']['curveMember']]
    except TypeError:
      curves = [c['LineString']['posList']
                for c in city_object['Building'][lod_terrain_str]['MultiCurve']['curveMember']]
    terrains = []
    for curve in curves:
      curve_points = np.fromstring(curve, dtype=float, sep=' ')
      curve_points = self._geometry.to_points_matrix(curve_points, True)
      terrains.append(curve_points)
    return terrains

  def _lod1(self, o):
    try:
      surfaces = [Surface(s['Polygon']['exterior']['LinearRing']['posList']['#text'])
                  for s in o['Building']['lod1Solid']['Solid']['exterior']['CompositeSurface']['surfaceMember']]
    except TypeError:
      surfaces = [Surface(s['Polygon']['exterior']['LinearRing']['posList'])
                  for s in o['Building']['lod1Solid']['Solid']['exterior']['CompositeSurface']['surfaceMember']]
    terrains = []
    for s in surfaces:
      ground = True
      ground_points = []
      for row in s.points:
        # all surface vertex are in the lower z
        ground_point = [row[0], row[1], self._lower_corner[2]]
        ground_points = np.concatenate((ground_points, ground_point), axis=None)
        ground = ground and self._geometry.almost_equal(row, ground_point)
      if ground:
        ground_points = self._geometry.to_points_matrix(ground_points)
        # Do i need to remove the duplicated?
        terrains.append(ground_points)
    return surfaces

  @staticmethod
  def _lod2(bound):
    surfaces = []
    for surface_type in iter(bound):
      for s in bound[surface_type]['lod2MultiSurface']['MultiSurface']['surfaceMember']:
        try:
          surfaces = [Surface(s['Polygon']['exterior']['LinearRing']['posList']['#text'],
                              surface_type=GeometryHelper.gml_surface_to_libs(surface_type))
                      for s in bound[surface_type]['lod2MultiSurface']['MultiSurface']['surfaceMember']]
        except TypeError:
          surfaces = [Surface(s['Polygon']['exterior']['LinearRing']['posList'],
                              surface_type=GeometryHelper.gml_surface_to_libs(surface_type))
                      for s in bound[surface_type]['lod2MultiSurface']['MultiSurface']['surfaceMember']]
    return surfaces