"""Generate fake lamba event containing SNS Topic events."""


def generate_records(messages):
    """Create many fake SNS Topic messages in one Lambda event.

    Args:
        messages (list): array of tuples representing SNS Endpoint events

    Returns:
        object: fake Lambda event trigger
    """
    return {
        'Records': [generate_message(x[0], x[1]) for x in messages]
    }


def generate_message(endpoint_arn, message_type):
    """Create SNS Endpoint message inside SNS Topic message.

    Args:
        endpoint_arn (str): fake endpoint arn value
        message_type (str): fake SNS Endpoint message type

    Returns:
        object: fake SNS Topic message
    """
    return {
        'EventSource': 'aws:sns',
        'EventVersion': '1.0',
        'EventSubscriptionArn': '',
        'Sns': {
            'Type': 'Notification',
            'MessageId': '',
            'TopicArn': '',
            'Subject': 'DeliveryFailure event for app',
            'Message': '{\"DeliveryAttempts\":1,\"EndpointArn\":\"%s\",\"EventType\":\"%s\",\"FailureMessage\":\"Platform token associated with the endpoint is not valid\",\"FailureType\":\"InvalidPlatformToken\",\"MessageId\":\"\",\"Resource\":\"\",\"Service\":\"SNS\",\"Time\":\"\"}' % (endpoint_arn, message_type),  # noqa:E501
            'Timestamp': '',
            'SignatureVersion': '1',
            'Signature': '',
            'SigningCertUrl': '',
            'UnsubscribeUrl': '',
            'MessageAttributes': {}
        }
    }