import itertools
import random
from typing import Any, 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 get_rnd(bonus_salt: Any = "") -> random.Random:
    loesungswort = await get_loesungswort()
    return random.Random(f"{loesungswort}{bonus_salt}")


async def set_length(seq: Sequence, length: int) -> list:
    # `seq` unendlich wiederholen
    infinite = itertools.cycle(seq)
    # Die ersten `length` einträge nehmen
    return list(itertools.islice(infinite, length))


async def shuffle(seq: Sequence, rnd: random.Random | None = None) -> list:
    # Zufallsgenerator
    if rnd is None:
        rnd = await get_rnd()

    # Elemente mischen
    return rnd.sample(seq, len(seq))