"""`/health` is the load-balancer probe — it must keep working even when the
engine bridge is absent (Phase 0 default)."""

from fastapi.testclient import TestClient


def test_health_returns_ok(client: TestClient) -> None:
    response = client.get("/health")
    assert response.status_code == 200

    payload = response.json()
    assert payload["status"] == "ok"
    assert payload["engine_available"] is False
    assert "version" in payload
    assert "environment" in payload


def test_health_does_not_require_engine(client: TestClient) -> None:
    """Regression guard: importing the app and hitting /health must not
    transitively import the pybind11 module (which doesn't exist yet)."""
    import sys

    had_pdfengine = "pdfengine" in sys.modules
    pdfengine_module = sys.modules.pop("pdfengine", None)
    try:
        response = client.get("/health")
        assert response.status_code == 200
        assert "pdfengine" not in sys.modules
    finally:
        if had_pdfengine and pdfengine_module is not None:
            sys.modules["pdfengine"] = pdfengine_module