import glob
import json
import os
import shutil
import zipfile
from pathlib import Path

from flask import Response, request, send_file, make_response
from flask_restful import Resource
from hub.exports.exports_factory import ExportsFactory
from hub.imports.geometry_factory import GeometryFactory
from werkzeug.utils import secure_filename

from hub_api.config import Config
from hub_api.helpers.session_helper import refresh_session


class Glb(Resource, Config):
  def __init__(self):
    super().__init__()
    self._extensions = ['.geojson', '.gml']
    self._tmp_path = (Path(__file__).parent / 'tmp').resolve()
    self._response_path = (Path(__file__).parent.parent / 'response_files').resolve()
    self._city = None

  def _allowed_extensions(self, filename):
    self._file_extension = Path(filename).suffix
    return self._file_extension in self._extensions

  def _geojson(self, file_path):
    try:
      height_field = request.form.get('height_field')
      year_of_construction_field = request.form.get('year_of_construction_field')
      function_field = request.form.get('function_field')
      function_dictionary = self._dictionaries[request.form.get('function_to_hub')]
      return GeometryFactory('geojson',
                             path=file_path,
                             height_field=height_field,
                             year_of_construction_field=year_of_construction_field,
                             function_field=function_field,
                             function_to_hub=function_dictionary).city
    except KeyError:
      return None

  def _citygml(self, file_path):
    try:
      year_of_construction_field = request.form.get('year_of_construction_field')
      function_field = request.form.get('function_field')
      function_dictionary = self._dictionaries[request.form.get('function_dictionary_name')]
      hub_crs = request.form.get('hub_crs')
      return GeometryFactory('citygml',
                             path=file_path,
                             year_of_construction_field=year_of_construction_field,
                             function_field=function_field,
                             function_to_hub=function_dictionary,
                             hub_crs=hub_crs).city
    except KeyError:
      return None

  def post(self):
    """
    API call for performing the monthly energy balance workflow
    """
    session_id = request.headers.get('session-id', None)
    token = request.headers.get('token', None)
    application_uuid = request.headers.get('application-uuid', None)
    _session = refresh_session(session_id, token, application_uuid)
    if _session is None:
      return Response(json.dumps({'error': 'unauthorized'}), status=403)
    else:
      response_token = {'token': _session['token']}
      tmp_path = (self._tmp_path / token).resolve()
      response_path = (self._response_path / session_id).resolve()
      try:
        os.mkdir(tmp_path)
      except FileExistsError:
        pass
      try:
        os.mkdir(response_path)
      except FileExistsError:
        pass
      geometry_file = request.files['geometry_file']
      if not self._allowed_extensions(geometry_file.filename):
        shutil.rmtree(tmp_path)
        return Response(json.dumps({'error': 'Unsupported media type'}), status=415, headers=response_token)
      filename = secure_filename(geometry_file.filename)
      file_path = os.path.join(tmp_path, filename)
      geometry_file.save(file_path)
      if self._file_extension == '.geojson':
        self._city = self._geojson(file_path)
      else:
        self._city = self._citygml(file_path)
      if self._city is None:
        shutil.rmtree(tmp_path)
        return Response(json.dumps({'error': 'Bad request'}), status=400, headers=response_token)
      ExportsFactory('glb', self._city, tmp_path).export()
      result_files = glob.glob(f'{tmp_path}/*.glb')
      result_zip = (response_path / f'{token}.zip').resolve()
      with zipfile.ZipFile(result_zip, 'w') as zf:
        for result_file in result_files:
          zf.write(result_file, Path(result_file).name)
    shutil.rmtree(tmp_path)
    response = make_response(send_file(result_zip))
    response.headers['token'] = token
    return response