"""
DBFactory performs read related operations
SPDX - License - Identifier: LGPL - 3.0 - or -later
Copyright © 2022 Concordia CERC group
Project CoderPeter Yefi peteryefi@gmail.com
"""
import json
from typing import Union, Dict

from hub.city_model_structure.city import City
from hub.persistence import Application
from hub.persistence import City as CityRepository
from hub.persistence import CityObject
from hub.persistence import SimulationResults
from hub.persistence import User
from hub.persistence import UserRoles


class DBControl:
  """
  DBFactory class
  """

  def __init__(self, db_name, app_env, dotenv_path):
    self._city_repository = CityRepository(db_name=db_name, dotenv_path=dotenv_path, app_env=app_env)
    self._application = Application(db_name=db_name, app_env=app_env, dotenv_path=dotenv_path)
    self._user = User(db_name=db_name, app_env=app_env, dotenv_path=dotenv_path)
    self._city_object = CityObject(db_name=db_name, app_env=app_env, dotenv_path=dotenv_path)
    self._simulation_results = SimulationResults(db_name=db_name, dotenv_path=dotenv_path, app_env=app_env)

  def application_info(self, application_uuid) -> Union[Application, None]:
    """
    Retrieve the application info for the given uuid
    :param application_uuid: the uuid for the application
    :return: Application or None
    """
    return self._application.get_by_uuid(application_uuid)

  def user_info(self, name, password, application_id):
    """
    Retrieve the user info for the given name and password and application_id
    :param name: the username
    :param password: the user password
    :param application_id: the application id
    :return: User or None
    """
    return self._user.get_by_name_application_id_and_password(name, password, application_id)

  def user_login(self, name, password, application_uuid):
    """
    Retrieve the user info
    :param name: the username
    :param password: the user password
    :param application_uuid: the application uuid
    :return: User or None
    """
    return self._user.get_by_name_application_uuid_and_password(name, password, application_uuid)

  def cities_by_user_and_application(self, user_id, application_id) -> [City]:
    """
    Retrieve the cities belonging to the user and the application
    :param user_id: User id
    :param application_id: Application id
    :return: [City]
    """
    return self._city_repository.get_by_user_id_and_application_id(user_id, application_id)

  def building_info(self, name, city_id) -> Union[CityObject, None]:
    """
    Retrieve the building info
    :param name: Building name
    :param city_id: City ID
    :return: CityObject or None
    """
    return self._city_object.get_by_name_and_city(name, city_id)

  def results(self, user_id, application_id, cities, result_names=None) -> Dict:
    """
    Retrieve the simulation results for the given cities
    :param user_id: the user id owning the results
    :param application_id: the application id owning the results
    :param cities: dictionary containing the city and building names for the results
    :param result_names: if given, filter the results to the selected names
    """
    if result_names is None:
      result_names = []
    results = {}
    for city in cities['cities']:
      city_name = next(iter(city))
      result_set = self._city_repository.get_by_user_id_application_id_and_name(user_id, application_id, city_name)
      if result_set is None:
        continue
      city_id = result_set.id
      results[city_name] = []
      for building_name in city[city_name]:
        if self._city_object.get_by_name_and_city(building_name, city_id) is None:
          continue
        city_object_id = self._city_object.get_by_name_and_city(building_name, city_id).id
        _ = self._simulation_results.get_simulation_results_by_city_id_city_object_id_and_names(
          city_id,
          city_object_id,
          result_names)

        for value in _:
          values = json.loads(value.values)
          values["building"] = building_name
          results[city_name].append(values)
    return results

  def persist_city(self, city: City, pickle_path, application_id: int, user_id: int):
    """
    Persist city into postgres database
    :param city: City to be stored
    :param pickle_path: Path to save the pickle file
    :param application_id: Application id owning this city
    :param user_id: User who create the city
    """
    return self._city_repository.insert(city, pickle_path, application_id, user_id)

  def update_city(self, city_id, city):
    """
   Update an existing city in postgres database
   :param city_id: the id of the city to update
   :param city: the updated city object
    """
    return self._city_repository.update(city_id, city)

  def persist_application(self, name: str, description: str, application_uuid: str):
    """
    Creates an application
   :param name: name of application
   :param description: the description of the application
   :param application_uuid: the uuid of the application to be created
    """
    return self._application.insert(name, description, application_uuid)

  def update_application(self, name: str, description: str, application_uuid: str):
    """
    Update an application
   :param name: name of application
   :param description: the description of the application
   :param application_uuid: the uuid of the application to be created
    """
    return self._application.update(application_uuid, name, description)

  def delete_city(self, city_id):
    """
    Deletes a single city from postgres
    :param city_id: the id of the city to get
    """
    self._city_repository.delete(city_id)

  def delete_application(self, application_uuid):
    """
    Deletes a single application from postgres
    :param application_uuid: the id of the application to get
    """
    self._application.delete(application_uuid)

  def add_simulation_results(self, name, values, city_id=None, city_object_id=None):
    """
    Add simulation results to the city or to the city_object
    :param name: simulation and simulation engine name
    :param values: simulation values in json format
    :param city_id: city id or None
    :param city_object_id: city object id or None
    """
    self._simulation_results.insert(name, values, city_id, city_object_id)

  def create_user(self, name: str, application_id: int, password: str, role: UserRoles):
    """
    Creates a new user
    :param name: the name of the user
    :param application_id: the application id of the user
    :param password: the password of the user
    :param role: the role of the user
    """
    return self._user.insert(name, password, role, application_id)

  def update_user(self, user_id: int, name: str, password: str, role: UserRoles):
    """
    Creates a new user
    :param user_id: the id of the user
    :param name: the name of the user
    :param password: the password of the user
    :param role: the role of the user
    """
    return self._user.update(user_id, name, password, role)

  def delete_user(self, user_id):
    """
    Retrieve a single user
    :param user_id: the id of the user to delete
    """
    return self._user.delete(user_id)

  def get_by_name_and_application(self, name: str, application: int):
    """
    Retrieve a single user
    :param name: username
    :param application: application accessing hub
    """
    return self._user.get_by_name_and_application(name, application)