import abc


class DCOSException(Exception):
    pass


class DCOSHTTPException(DCOSException):
    """ A wrapper around Response objects for HTTP error codes.

    :param response: requests Response object
    :type response: Response
    """
    def __init__(self, response):
        self.response = response

    def __str__(self):
        return 'Error while fetching [{0}]: HTTP {1}: {2}'.format(
            self.response.request.url,
            self.response.status_code,
            self.response.reason)


class Error(object):
    """Abstract class for describing errors."""

    @abc.abstractmethod
    def error(self):
        """Creates an error message

        :returns: The error message
        :rtype: str
        """

        raise NotImplementedError


class DefaultError(Error):
    """Construct a basic Error class based on a string

    :param message: String to use for the error message
    :type message: str
    """

    def __init__(self, message):
        self._message = message

    def error(self):
        return self._message