class UserBase:
    """
    Base interface implementation for API's to manage users.
    """

    # create a user
    def create_user(self, request: str) -> str:
        """
        :param request: A json string with the user details
        {
          "name" : "<user_name>",
          "display_name" : "<display name>"
        }
        :return: A json string with the response {"id" : "<user_id>"}

        Constraint:
            * user name must be unique
            * name can be max 64 characters
            * display name can be max 64 characters
        """
        pass

    # list all users
    def list_users(self) -> str:
        """
        :return: A json list with the response
        [
          {
            "name" : "<user_name>",
            "display_name" : "<display name>",
            "creation_time" : "<some date:time format>"
          }
        ]
        """
        pass

    # describe user
    def describe_user(self, request: str) -> str:
        """
        :param request: A json string with the user details
        {
          "id" : "<user_id>"
        }

        :return: A json string with the response

        {
          "name" : "<user_name>",
          "description" : "<some description>",
          "creation_time" : "<some date:time format>"
        }

        """
        pass

    # update user
    def update_user(self, request: str) -> str:
        """
        :param request: A json string with the user details
        {
          "id" : "<user_id>",
          "user" : {
            "name" : "<user_name>",
            "display_name" : "<display name>"
          }
        }

        :return:

        Constraint:
            * user name cannot be updated
            * name can be max 64 characters
            * display name can be max 128 characters
        """
        pass

    def get_user_teams(self, request: str) -> str:
        """
        :param request:
        {
          "id" : "<user_id>"
        }

        :return: A json list with the response.
        [
          {
            "name" : "<team_name>",
            "description" : "<some description>",
            "creation_time" : "<some date:time format>"
          }
        ]
        """
        pass