from __future__ import annotations

import unittest

from src.hdmi_control import _parse_v4l2_devices, _recommend_capture_device


class HdmiControlTests(unittest.TestCase):
    def test_parse_v4l2_devices_extracts_nodes(self) -> None:
        text = (
            "USB Video:\n"
            "\t/dev/video0\n"
            "\t/dev/video1\n"
            "\n"
            "bcm2835-codec:\n"
            "\t/dev/video10\n"
        )
        items = _parse_v4l2_devices(text)
        self.assertEqual(items[0]["name"], "USB Video")
        self.assertEqual(items[0]["nodes"], ["/dev/video0", "/dev/video1"])
        self.assertTrue(items[0]["is_capture_candidate"])

    def test_parse_v4l2_devices_handles_empty(self) -> None:
        self.assertEqual(_parse_v4l2_devices(""), [])

    def test_recommend_capture_device_skips_codec_only_nodes(self) -> None:
        text = (
            "bcm2835-codec:\n"
            "\t/dev/video10\n"
            "\n"
            "USB Video:\n"
            "\t/dev/video0\n"
        )
        items = _parse_v4l2_devices(text)
        self.assertFalse(items[0]["is_capture_candidate"])
        self.assertEqual(_recommend_capture_device(["/dev/video0", "/dev/video10"], items), "/dev/video0")


if __name__ == "__main__":
    unittest.main()