import pytest
import sys
from unittest.mock import MagicMock, patch

# Mock RPi.GPIO and pygame before importing wecker
sys.modules["RPi"] = MagicMock()
sys.modules["RPi.GPIO"] = MagicMock()
sys.modules["pygame"] = MagicMock()

import wecker  # noqa: E402


@pytest.fixture
def mock_gpio():
    with patch.object(wecker, "GPIO") as mock:
        mock.LOW = 0
        mock.HIGH = 1
        yield mock


@pytest.fixture
def mock_pygame():
    with patch.object(wecker, "pygame") as mock:
        yield mock


def test_set_led(mock_gpio):
    wecker.set_led(True)
    mock_gpio.output.assert_called_with(wecker.LED_PIN, mock_gpio.LOW)

    wecker.set_led(False)
    mock_gpio.output.assert_called_with(wecker.LED_PIN, mock_gpio.HIGH)


@patch("wecker.time.time")
def test_run_alarm_plays_music(mock_time, mock_gpio, mock_pygame):
    mock_pygame.mixer.get_init.return_value = True
    wecker.run_alarm(test_mode=True)
    assert mock_pygame.mixer.music.play.called


def test_run_alarm_unknown_style_raises(mock_gpio, mock_pygame):
    """An unknown style is rejected before any hardware is touched."""
    with pytest.raises(ValueError, match="Unknown alarm style"):
        wecker.run_alarm(style_name="nope", test_mode=True)
    mock_pygame.mixer.init.assert_not_called()


def test_run_alarm_uses_selected_style(mock_gpio, mock_pygame):
    """run_alarm looks up the style by name and drives the returned style."""
    mock_pygame.mixer.get_init.return_value = True
    fake = MagicMock()
    fake.update.return_value = True  # keep ringing
    fake_style_cls = MagicMock(return_value=fake)

    with patch("wecker.get_style", return_value=fake_style_cls) as get_style:
        wecker.run_alarm(style_name="whatever", test_mode=True)

    get_style.assert_called_once_with("whatever")
    fake_style_cls.assert_called_once_with(wecker.set_led)
    fake.update.assert_called()


def test_setup_uses_env_music_file(mock_gpio, mock_pygame, monkeypatch):
    monkeypatch.setenv("MUSIC_FILE", "/custom/track.mp3")
    wecker.setup()
    mock_pygame.mixer.music.load.assert_called_with("/custom/track.mp3")


def test_setup_music_file_argument_overrides_env(mock_gpio, mock_pygame, monkeypatch):
    monkeypatch.setenv("MUSIC_FILE", "/env/track.mp3")
    wecker.setup(music_file="/arg/track.mp3")
    mock_pygame.mixer.music.load.assert_called_with("/arg/track.mp3")
