"""Smoke tests for codex.config.Settings."""

from __future__ import annotations

from codex.config import Settings, get_settings


def test_settings_defaults() -> None:
    """Settings() is constructable without env vars; expected defaults are set."""
    s = Settings()
    assert s.database_url == "postgresql://researcher:change_me@localhost:5432/papers"
    assert s.embedding_model == "BAAI/bge-m3"
    assert s.embedding_dim == 1024


def test_settings_env_override(monkeypatch: object) -> None:
    """DATABASE_URL env var overrides the default database_url."""
    import pytest

    mp: pytest.MonkeyPatch = monkeypatch  # type: ignore[assignment]
    mp.setenv("DATABASE_URL", "postgresql://x:y@h:5432/db")
    s = Settings()
    assert s.database_url == "postgresql://x:y@h:5432/db"


def test_get_settings_is_singleton() -> None:
    """get_settings() returns the same object on repeated calls; new object after cache_clear."""
    get_settings.cache_clear()
    first = get_settings()
    second = get_settings()
    assert first is second

    get_settings.cache_clear()
    third = get_settings()
    assert third is not first