"""This Lambda sends transcoding status to SNS topic."""

import os
import boto3

sns_client = boto3.client('sns')


def send_transcoding_status(event):
    """Send sns message with event['status'] to topic with name: SNS_TOPIC_ARN.

    Args:
        event: (dict): Information about file transcoding process.
    """
    topic_arn = os.environ.get('SNS_TOPIC_ARN')
    sns_client.publish(TopicArn=topic_arn, Message=event['status'])


def handler(event, context):
    """Lambda handler.

    Args:
        event: (dict): Information about uploaded file.
        context: (dict): Environment state.
    Returns:
        str: 'Finish'
    """
    send_transcoding_status(event)
    return 'Finish'