"""How loud UI sounds are, and the album picker's two sounds."""

from __future__ import annotations

import io
import wave
from collections.abc import Callable

import pytest

from musicmouse.blubb import RATE, confirm_wav, tick_wav
from musicmouse.sound import MIN_PLAYER_VOLUME, ui_level


def test_ui_sounds_follow_the_music_volume() -> None:
    assert ui_level(0.8, 1.0) == pytest.approx(0.8)
    assert ui_level(1.0, 0.5) == pytest.approx(0.5)


def test_ui_sounds_never_drop_below_the_minimum_player_volume() -> None:
    # A muted player must not mute the timer, nor make the album picker silent.
    assert ui_level(0.0, 1.0) == pytest.approx(MIN_PLAYER_VOLUME)
    assert ui_level(0.0, 0.5) == pytest.approx(MIN_PLAYER_VOLUME * 0.5)


def test_parents_can_still_turn_ui_sounds_off() -> None:
    assert ui_level(0.8, 0.0) == 0.0


@pytest.mark.parametrize(("make", "longest"), [(tick_wav, 0.05), (confirm_wav, 0.4)])
def test_the_picker_sounds_are_short_mono_wavs(make: Callable[..., bytes], longest: float) -> None:
    with wave.open(io.BytesIO(make(gain=0.5))) as wav:
        assert (wav.getnchannels(), wav.getsampwidth(), wav.getframerate()) == (1, 2, RATE)
        assert 0 < wav.getnframes() / RATE < longest


def test_the_gain_sets_the_peak() -> None:
    def peak(data: bytes) -> int:
        with wave.open(io.BytesIO(data)) as wav:
            frames = wav.readframes(wav.getnframes())
        return max(
            abs(int.from_bytes(frames[i : i + 2], "little", signed=True))
            for i in range(0, len(frames), 2)
        )

    assert peak(tick_wav(gain=1.0)) == pytest.approx(32767, abs=1)
    assert peak(tick_wav(gain=0.25)) == pytest.approx(32767 / 4, abs=1)