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 data_dir() -> Path:
    """Server data directory (overridable via ZKAC_DATA_DIR)."""
    return Path(os.environ.get("ZKAC_DATA_DIR", zkac_home()))