import random
import typing
from flytekit import conditional, task, workflow


@task
def coin_toss(seed: int) -> typing.Optional[bool]:
    r = random.Random(seed)
    if r.random() < 0.5:
        return True
    return None


@task
def failed() -> int:
    return -1


@task
def success() -> int:
    return 0


@workflow
def wf(seed: int = 5) -> int:
    result = coin_toss(seed=seed)
    return conditional("test").if_(result.is_none()).then(success()).else_().then(failed())


if __name__ == '__main__':
    wf()