from __future__ import annotations

import os
from pathlib import Path


def zkac_home() -> Path:
    return Path(os.environ.get("ZKAC_HOME", Path.home() / ".zkac"))


def user_dir(userid: str) -> Path:
    return zkac_home() / userid


def ensure_user(userid: str) -> Path:
    zkac_home().mkdir(parents=True, exist_ok=True)
    d = user_dir(userid)
    d.mkdir(parents=True, exist_ok=True)
    return d