"""Amazon SNS connector."""

import boto3


def get_sns_resource():
    """Get SNS client.

    Returns:
         boto3.resources.base.ServiceResource: SNS resource represents
         object-oriented interface of SNS.

    """
    sns_resource = boto3.resource('sns')
    return sns_resource


def publish_sns_message_to_email(message, topic, sns_resource=None):
    """Publish Amazon SNS message.

    Args:
        message (str): the message content.
        topic (str): sns topic.
        sns_resource (boto3.resources.base.ServiceResource): optional
            SNS resource.

    Returns:
        dict: Result of SNS publish

    """
    sns = sns_resource if sns_resource else get_sns_resource()
    topic = sns.Topic(topic)
    return topic.publish(Message=message, MessageStructure='string')