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from aws_lambda_powertools import Logger

LOG: Logger = Logger(service=__name__)


def build_kinesis_stream_template(dynamodb_client: object, source_table_name: str = ""):
    """Builds a CFN template for the DynamoDB table kinesis stream settings.

    Args:
        dynamodb_client: Authenticated DynamoDB boto3 client.
        source_table_name: The name of the source table.

    Returns:
      A dictionary representing CFN yaml for the Kinesis Stream settings of a DynamoDB table

    Raises:
    """
    kinesis_stream_arn = ""
    kinesis_stream_specification = {}
    response = dynamodb_client.describe_kinesis_streaming_destination(
        TableName=source_table_name
    )
    kinesis_stream_destinations = response.get("KinesisDataStreamDestinations", [])
    LOG.info(f"Source table kinesis stream destinations: {kinesis_stream_destinations}")

    if kinesis_stream_destinations:
        kinesis_stream_arn = kinesis_stream_destinations[0].get("StreamArn", None)
    LOG.info(f"Kinesis stream ARN: {kinesis_stream_arn}")

    if kinesis_stream_arn:
        kinesis_stream_specification.update(StreamArn=kinesis_stream_arn)
    LOG.info(f"Kinesis stream specification: {kinesis_stream_specification}")

    return kinesis_stream_specification