from __future__ import annotations

import pytest

from somafm_tui import macos_tap


def test_osstatus_decodes_four_character_codes() -> None:
    # 'who?' is kAudioHardwareBadObjectError.
    assert macos_tap._osstatus(int.from_bytes(b"who?", "big")) == "'who?'"
    assert macos_tap._osstatus(-50) == "-50"


def test_start_raises_without_the_native_api(monkeypatch) -> None:
    monkeypatch.setattr(macos_tap, "available", lambda: False)
    tap = macos_tap.SystemAudioTap()
    with pytest.raises(macos_tap.TapError):
        tap.start()
    assert tap.running is False
    tap.stop()  # tearing down a tap that never started is safe


def test_read_returns_none_when_not_running() -> None:
    tap = macos_tap.SystemAudioTap()
    assert tap.read(0.0) is None


def test_uses_no_external_helpers() -> None:
    # The tap must never shell out: no helper binary, no ffmpeg, no driver.
    import inspect

    source = inspect.getsource(macos_tap).casefold()
    assert "subprocess" not in source
    assert "avfoundation" not in source