from pydantic import SecretStr

from tutor.config import Settings


def _settings(**overrides: object) -> Settings:
    # _env_file=None: ignore any local .env so tests are hermetic.
    return Settings(_env_file=None, **overrides)  # type: ignore[arg-type]


def test_defaults_are_offline_safe() -> None:
    settings = _settings()
    assert settings.llm_provider == "fake"
    assert settings.storage_backend == "memory"
    assert settings.port == 7860


def test_env_overrides(monkeypatch) -> None:
    monkeypatch.setenv("LLM_PROVIDER", "gemini")
    monkeypatch.setenv("LLM_MODEL", "gemini-2.5-flash")
    monkeypatch.setenv("LLM_API_KEY", "sk-test")
    settings = _settings()
    assert settings.llm_provider == "gemini"
    assert settings.llm_model == "gemini-2.5-flash"
    assert isinstance(settings.llm_api_key, SecretStr)


def test_api_key_is_not_leaked_in_repr() -> None:
    settings = _settings(llm_api_key=SecretStr("sk-very-secret"))
    assert "sk-very-secret" not in repr(settings)
    assert "sk-very-secret" not in str(settings)