from pathlib import Path

import pytest

from nisse_dev.config import REQUIRED
from nisse_dev.main import main


def test_main_refuses_to_start_without_configuration(
    monkeypatch: pytest.MonkeyPatch,
    capsys: pytest.CaptureFixture[str],
    tmp_path: Path,
) -> None:
    # Clear the real variables rather than swapping os.environ: from_env binds
    # the environment object as a default argument, so a replacement would be
    # ignored. And point NISSE_ENV at a file that does not exist, because the
    # working directory's .env holds live credentials.
    for name in REQUIRED:
        monkeypatch.delenv(name, raising=False)
    monkeypatch.setenv("NISSE_ENV", str(tmp_path / "absent.env"))

    assert main() == 2

    err = capsys.readouterr().err
    assert "cannot start" in err
    assert "NISSE_LLM_TOKEN" in err