"""Settings that must not live in git — database URLs. Read from the environment first, else from the
git-ignored `.env` at the repo root (KEY=VALUE lines, # comments)."""
import os
from functools import lru_cache
from pathlib import Path

ENV_FILE = Path(__file__).resolve().parents[1] / ".env"


@lru_cache(maxsize=1)
def _values():
    values = {}
    if ENV_FILE.exists():
        for line in ENV_FILE.read_text(encoding="utf-8").splitlines():
            line = line.strip()
            if line and not line.startswith("#") and "=" in line:
                key, value = line.split("=", 1)
                values[key.strip()] = value.strip()
    return values


def get(key, default=None):
    return os.environ.get(key) or _values().get(key, default)