text: ##    _____  _____
  ##   |  __ \|  __ \    AUTHOR: Pedro Rivero
  ##   | |__) | |__) |   ---------------------------------
  ##   |  ___/|  _  /    DATE: May 19, 2021
  ##   | |    | | \ \    ---------------------------------
  ##   |_|    |_|  \_\   https://github.com/pedrorrivero
  ##
  
  ## Copyright 2021 Pedro Rivero
  ##
  ## Licensed under the Apache License, Version 2.0 (the "License");
  ## you may not use this file except in compliance with the License.
  ## You may obtain a copy of the License at
  ##
  ## http://www.apache.org/licenses/LICENSE-2.0
  ##
  ## Unless required by applicable law or agreed to in writing, software
  ## distributed under the License is distributed on an "AS IS" BASIS,
  ## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ## See the License for the specific language governing permissions and
  ## limitations under the License.
  
  from typing import Callable, Optional
  
  from qiskit.providers import BackendV1 as Backend
  from qiskit.providers import Job, Options
  
  from ..backend import QuantumBackend
  
  
  ###############################################################################
  ## QISKIT BACKEND (DECORATOR)
  ###############################################################################
  class QiskitBackend(QuantumBackend, Backend):
      def __init__(self, backend: Backend) -> None:
          self._base_backend: Backend = backend
          super(QuantumBackend, self).__init__(
              backend.configuration(), backend.provider()
          )
          self._options: Options = backend._options
  
      ############################### PUBLIC API ###############################
      @property
      def configuration_dict(self) -> dict:
          return self.configuration().to_dict()
  
      @property
      def max_experiments(self) -> int:
          return (
              self.configuration_dict["max_experiments"]
              if self.configuration_dict.__contains__("max_experiments")
              and self.configuration_dict["max_experiments"]
              else 1
          )
  
      @property
      def max_measurements(self) -> int:
          return self.max_shots * self.max_experiments
  
      @property
      def max_qubits(self) -> int:
          return (
              self.configuration_dict["n_qubits"]
              if self.configuration_dict.__contains__("n_qubits")
              and self.configuration_dict["n_qubits"]
              else 1
          )
  
      @property
      def max_shots(self) -> int:
          return (
              self.configuration_dict["max_shots"]
              if self.configuration_dict.__contains__("max_shots")
              and self.configuration_dict["max_shots"]
              and self.memory
              else 1
          )
  
      @property
      def memory(self) -> bool:
          return (
              self.configuration_dict["memory"]
              if self.configuration_dict.__contains__("memory")
              else False
          )
  
      ############################ QISKIT INTERFACE ############################
      def _default_options(self) -> Options:
          return self._base_backend._default_options()
  
      def run(self, run_input, **options) -> Job:
          return self._base_backend.run(run_input, **options)
  