from __future__ import annotations

import socket
from types import SimpleNamespace

import pytest

from tools import start_n7web


def test_tcp_port_probe_detects_an_existing_listener() -> None:
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as listener:
        listener.bind(("127.0.0.1", 0))
        listener.listen(1)

        assert start_n7web._tcp_port_is_listening(  # noqa: SLF001
            "0.0.0.0",
            listener.getsockname()[1],
        )


def test_startup_rejects_a_duplicate_service_port(monkeypatch: pytest.MonkeyPatch) -> None:
    args = SimpleNamespace(
        host="127.0.0.1",
        port=8000,
        scene_bind="0.0.0.0",
        scene_port=8090,
    )
    monkeypatch.setattr(
        start_n7web,
        "_tcp_port_is_listening",
        lambda _host, port: port == 8000,
    )

    with pytest.raises(RuntimeError, match="stop the previous N7Web instance"):
        start_n7web._ensure_service_ports_available(args)  # noqa: SLF001