import itertools
import random
from typing import Sequence

from ..dav_common import dav_get_file


async def get_loesungswort() -> str:
    fp = await dav_get_file("loesungswort.txt")
    return fp.read().decode("utf8").strip()


async def shuffle(seq: Sequence, length: int | None = None) -> list:
    rnd = random.Random(await get_loesungswort())

    if length is not None:
        infinity = itertools.cycle(seq)
        seq = list(itertools.islice(infinity, length))

    return rnd.sample(seq, len(seq))