text: #
  # Copyright (c) 2019, Neptune Labs Sp. z o.o.
  #
  # 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 neptune.new.attributes.constants import SIGNAL_TYPE_ABORT, SIGNAL_TYPE_STOP
  
  
  class Message(object):
      def __init__(self):
          pass
  
      MESSAGE_TYPE = "messageType"
      MESSAGE_NEW_TYPE = "type"
      MESSAGE_BODY = "messageBody"
      MESSAGE_NEW_BODY = "body"
  
      @classmethod
      def from_json(cls, json_value):
          message_type = json_value.get(Message.MESSAGE_TYPE) or json_value.get(
              Message.MESSAGE_NEW_TYPE
          )
          message_body = json_value.get(Message.MESSAGE_BODY) or json_value.get(
              Message.MESSAGE_NEW_BODY
          )
  
          if message_type == SIGNAL_TYPE_STOP:
              message_type = MessageType.STOP
          elif message_type == SIGNAL_TYPE_ABORT:
              message_type = MessageType.ABORT
  
          if message_type in MessageClassRegistry.MESSAGE_CLASSES:
              return MessageClassRegistry.MESSAGE_CLASSES[message_type].from_json(
                  message_body
              )
          else:
              raise ValueError(u"Unknown message type '{}'!".format(message_type))
  
      @classmethod
      def get_type(cls):
          raise NotImplementedError()
  
      def body_to_json(self):
          raise NotImplementedError()
  
  
  class AbortMessage(Message):
      @classmethod
      def get_type(cls):
          return MessageType.ABORT
  
      @classmethod
      def from_json(cls, json_value):
          return AbortMessage()
  
      def body_to_json(self):
          return None
  
  
  class StopMessage(Message):
      @classmethod
      def get_type(cls):
          return MessageType.STOP
  
      @classmethod
      def from_json(cls, json_value):
          return StopMessage()
  
      def body_to_json(self):
          return None
  
  
  class ActionInvocationMessage(Message):
      _ACTION_ID_JSON_KEY = "actionId"
      _ACTION_INVOCATION_ID_JSON_KEY = "actionInvocationId"
      _ARGUMENT_JSON_KEY = "argument"
  
      def __init__(self, action_id, action_invocation_id, argument):
          super(ActionInvocationMessage, self).__init__()
          self.action_id = action_id
          self.action_invocation_id = action_invocation_id
          self.argument = argument
  
      @classmethod
      def get_type(cls):
          return MessageType.ACTION_INVOCATION
  
      @classmethod
      def from_json(cls, json_value):
          field_names = [
              cls._ACTION_ID_JSON_KEY,
              cls._ACTION_INVOCATION_ID_JSON_KEY,
              cls._ARGUMENT_JSON_KEY,
          ]
          return ActionInvocationMessage(*[json_value[field] for field in field_names])
  
      def body_to_json(self):
          return {
              self._ACTION_ID_JSON_KEY: self.action_id,
              self._ACTION_INVOCATION_ID_JSON_KEY: self.action_invocation_id,
              self._ARGUMENT_JSON_KEY: self.argument,
          }
  
  
  class MessageType(object):
      NEW_CHANNEL_VALUES = "NewChannelValues"
      ABORT = "Abort"
      STOP = "Stop"
      ACTION_INVOCATION = "InvokeAction"
  
  
  class MessageClassRegistry(object):
      # pylint:disable=no-member
      def __init__(self):
          pass
  
      MESSAGE_CLASSES = dict([(cls.get_type(), cls) for cls in Message.__subclasses__()])
  