import pathlib

import bootstrap


def test_ensure_python_prefers_agent_venv_when_launcher_cannot_import_agent(monkeypatch, tmp_path):
    """Avoid starting WebUI with a local venv that later cannot import AIAgent."""
    local_python = tmp_path / "webui" / ".venv" / "bin" / "python"
    agent_python = tmp_path / "agent" / "venv" / "bin" / "python"
    agent_python.parent.mkdir(parents=True)
    agent_python.write_text("", encoding="utf-8")

    probes = []

    def fake_can_run(python_exe: str, agent_dir: pathlib.Path | None = None) -> bool:
        probes.append(pathlib.Path(python_exe))
        return pathlib.Path(python_exe) == agent_python

    monkeypatch.setattr(bootstrap, "_python_can_run_webui_and_agent", fake_can_run)

    selected = bootstrap.ensure_python_has_webui_deps(str(local_python), tmp_path / "agent")

    assert selected == str(agent_python)
    assert probes == [local_python, agent_python]


def test_ensure_python_fails_loudly_when_no_interpreter_can_import_agent(monkeypatch, tmp_path):
    """Do not report health OK when chat would fail with missing AIAgent."""
    local_python = tmp_path / "webui" / ".venv" / "bin" / "python"
    agent_python = tmp_path / "agent" / "venv" / "bin" / "python"
    agent_python.parent.mkdir(parents=True)
    agent_python.write_text("", encoding="utf-8")

    monkeypatch.setattr(bootstrap, "_python_can_run_webui_and_agent", lambda *a, **k: False)
    monkeypatch.setattr(bootstrap.subprocess, "run", lambda *a, **k: None)

    try:
        bootstrap.ensure_python_has_webui_deps(str(local_python), tmp_path / "agent")
    except RuntimeError as exc:
        assert "cannot import both WebUI dependencies and Hermes Agent" in str(exc)
    else:
        raise AssertionError("expected RuntimeError")