import re

from discovery import Camera, discover_cameras, select_cameras

CARD_RE = re.compile(r"\s*(\d+)\s+\[([A-Za-z0-9_]+)\s*\]:\s*(.*)")


def test_padded_c920_card_line_matches():
    line = " 2 [C920            ]: USB-Audio - HD Pro Webcam C920"
    m = CARD_RE.match(line)
    assert m is not None
    assert int(m.group(1)) == 2
    assert m.group(2) == "C920"


def test_naive_word_regex_misses_padding():
    line = " 2 [C920            ]: USB-Audio - HD Pro Webcam C920"
    assert re.match(r"\s*(\d+)\s+\[(\w+)\]:", line) is None


def test_live_discover_present_cameras():
    cams = discover_cameras()
    assert len(cams) >= 1
    assert all(c.audio_card is not None for c in cams)
    assert all(c.serial for c in cams)
    assert all(re.match(r"cam-\d{2}$", c.identity) for c in cams)
    ids = [c.identity for c in cams]
    assert ids == sorted(ids)


def test_select_cameras_by_identity_not_index():
    cams = [
        Camera(index=0, identity="cam-01", video_device="/dev/cam01",
               audio_card=2, serial="A"),
        Camera(index=1, identity="cam-05", video_device="/dev/cam05",
               audio_card=6, serial="B"),
        Camera(index=2, identity="cam-20", video_device="/dev/cam20",
               audio_card=21, serial="C"),
    ]
    out = select_cameras(cams, ["1", "5"])
    assert [c.identity for c in out] == ["cam-01", "cam-05"]


def test_select_cameras_all():
    cams = [
        Camera(index=0, identity="cam-01", video_device="/dev/cam01",
               audio_card=2, serial="A"),
    ]
    assert select_cameras(cams, ["all"]) == cams