""" An Simple example lambda"""
from typing import Set

# pylint: disable=unused-argument
def handler(event, context):
    """
    Lambda event handler takes a number and returns it's factors

    event must have an value key which can be cast to an int

    return value is a comma separated list of numbers as a string
  """
    try:
        value = int(event["value"])
    except Exception as error:
        print(f"Failure\tFailed to read value\t{error}\t{event}")
        raise error
    try:
        factors = get_factors(value)
        response = stringify(factors)
        print(f"Success\tCalculated\t{value}\t{response}")
        return response
    except Exception as error:
        print(f"Failure\tFailed to calculate response\t{error}\t{value}")
        raise error


def get_factors(number: int) -> Set[int]:
    """ Calculate factors of an integer """
    result = set()
    for i in range(1, int(number ** 0.5) + 1):
        div, mod = divmod(number, i)
        if mod == 0:
            result.add(i)
            result.add(div)
    return result


def stringify(numbers: Set[int]) -> str:
    """ Convert a list of numbers to an order comma separated list """
    numbers = list(numbers)
    numbers.sort()
    numbers = [str(i) for i in numbers]
    response = ",".join(numbers)
    return response