"""Custom exceptions."""


class OwsError(Exception):
    """Exception to create OwsException from str message."""

    def __init__(self, message, status=500):
        """Initialize exception."""
        super().__init__()
        self.message = message
        self.status = status

    @classmethod
    def not_found(cls, message=None):
        """Return not found error."""
        return OwsError(message, 404)

    @classmethod
    def forbidden(cls, message='Access Forbidden'):
        """Return not found error."""
        return OwsError(message, 403)

    @classmethod
    def bad_request(cls, message=None):
        """Return bad request error."""
        return OwsError(message, 400)

    @classmethod
    def internal_server_error(cls, message=None):
        """Return bad request error."""
        return OwsError(message, 500)

    @classmethod
    def response_error(cls, response):
        """Return a ows response error."""
        return OwsError(response.text, response.status_code)

    @classmethod
    def from_boto3_client_error(cls, client_error, app_error):
        """Turn a boto3 ClientError into an OwsError."""
        error_response = client_error.response
        error_code = error_response['Error']['Code']
        error_message = error_response['Error']['Message']
        error_status = error_response['ResponseMetadata']['HTTPStatusCode']

        raise OwsError('{code}: {app_err}, {boto_err}'.format(
            code=error_code, app_err=app_error, boto_err=error_message), error_status)

    def __str__(self):
        """Turn this exception into a string."""
        if not self.message:
            return str(self.status)
        return 'Status %d: %s' % (self.status, self.message)