"""Step Functions common functions."""

import boto3
import config

client = boto3.client('stepfunctions', region_name=config.AWS_REGION)


def start_execution(execution_input, execution_name, state_machine_arn):
    """Start a state machine execution.

    Args:
        execution_input (str): String of JSON input data for the execution.
        execution_name (str): The name of the execution.
        state_machine_arn (str): The Amazon Resource Name of the state machine.

    Returns:
        Response from Step Functions.
    """
    response = client.start_execution(
        input=execution_input,
        name=execution_name,
        stateMachineArn=state_machine_arn
    )
    return response