import time


class DeviceCredentialMixin(object):
    def get_client_id(self):
        raise NotImplementedError()

    def get_scope(self):
        raise NotImplementedError()

    def get_user_code(self):
        raise NotImplementedError()

    def is_expired(self):
        raise NotImplementedError()


class DeviceCredentialDict(dict, DeviceCredentialMixin):
    def get_client_id(self):
        return self['client_id']

    def get_scope(self):
        return self.get('scope')

    def get_user_code(self):
        return self['user_code']

    def get_nonce(self):
        return self.get('nonce')

    def get_auth_time(self):
        return self.get('auth_time')

    def is_expired(self):
        expires_at = self.get('expires_at')
        if expires_at:
            return expires_at < time.time()
        return False