import os
import sys
from pathlib import Path

from dotenv import load_dotenv  # type: ignore


def load_dotenv_if_present(dotenv_path: str | os.PathLike = ".env.local") -> bool:
    """
    Optional convenience for local dev: loads .env if python-dotenv is installed.
    If python-dotenv is not installed or file doesn't exist, this is a no-op.

    Returns True if a .env was loaded, else False.
    """
    p = Path(dotenv_path)
    if not p.exists():
        return False

    load_dotenv(dotenv_path=p)
    return True


def require_secrets(*names: str) -> None:
    """Verify that required HF Space secrets are set, or exit with a clear message.

    Only enforced when ``SPACE_ID`` is present in the environment (i.e. the app
    is running on Hugging Face Spaces).  Locally, developers authenticate via
    ``hf auth login`` so secrets like ``MODEL_ACCESS_TOKEN`` are not needed.

    Args:
        *names: Environment variable names that must be non-empty.

    Raises:
        SystemExit: If any secret is missing while running on HF Spaces.
    """
    space_id = os.environ.get("SPACE_ID", "")
    if not space_id or not names:
        return

    missing = [n for n in names if not os.environ.get(n, "").strip()]
    if not missing:
        return

    settings_url = f"https://huggingface.co/spaces/{space_id}/settings"
    print(
        f"ERROR: Missing required secrets: {', '.join(missing)}\n" f"Set them at: {settings_url}",
        file=sys.stderr,
    )
    sys.exit(1)