from __future__ import annotations

import asyncio

from app.bpm.service import BeatAnalyzer, BpmService


def test_beat_analyzer_estimates_click_track_bpm() -> None:
    analyzer = BeatAnalyzer(sample_rate=44_100, window_size=1024)
    click = (b"\x00\x40" * 2048) + (b"\x00\x00" * (44_100 // 2 - 2048))

    result = None
    for _ in range(6):
        result = analyzer.feed_pcm16(click)

    assert result is not None
    bpm, confidence = result
    assert 117 <= bpm <= 124
    assert confidence > 0.5


def test_bpm_service_synthetic_audio_updates_snapshot() -> None:
    async def run_test() -> None:
        service = BpmService()
        await service.start_audio("synthetic-click-track")
        await asyncio.sleep(1.2)
        snapshot = service.snapshot()
        await service.stop_audio()

        assert snapshot["mode"] == "audio:synthetic-click-track"
        assert snapshot["audio_connected"] is True
        assert 117 <= float(snapshot["bpm"]) <= 123
        assert float(snapshot["confidence"]) > 0.3
        assert float(snapshot["input_level"]) > 0.0
        assert float(snapshot["peak_level"]) >= float(snapshot["input_level"])
        assert snapshot["clipping"] is False

    asyncio.run(run_test())


def test_parse_alsa_card_line_supports_named_aliases() -> None:
    service = BpmService()

    card = service._parse_card_line("card 1: SB [HDA ATI SB], device 0: ALC883 Analog [ALC883 Analog]")
    device = service._parse_device_from_card_line(
        "card 1: SB [HDA ATI SB], device 0: ALC883 Analog [ALC883 Analog]"
    )

    assert card == ("1", "SB", "HDA ATI SB")
    assert device == ("0", "ALC883 Analog", "ALC883 Analog")


def test_busy_alsa_error_is_humanized() -> None:
    service = BpmService()

    message = service._humanize_alsa_error(
        "alsa:plughw:CARD=SB,DEV=0",
        "arecord: main:831: audio open error: Device or resource busy",
    )

    assert "Mikrofonen er optaget" in message