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_start_to_wait(mock_time, mock_gpio, mock_pygame):
    # Mock pygame.mixer.get_init() to return True so music plays
    mock_pygame.mixer.get_init.return_value = True

    # Just run it in test mode, it should execute the loop once and exit
    wecker.run_alarm(test_mode=True)
    assert mock_pygame.mixer.music.play.called


def test_state_machine_evaluation(mock_gpio, mock_pygame):
    clock = wecker.AlarmClock()

    # Transition to ringing -> wait before blink
    clock.update(100.0, True)  # button press
    assert clock.state == wecker.STATE_WAIT_BEFORE_BLINK

    # Wait 3 seconds -> blinking
    with patch("wecker.random.randint", return_value=3):
        clock.update(103.1, False)
    assert clock.state == wecker.STATE_BLINKING
    assert clock.target_blinks == 3

    # Advance time past the blink sequence (3 blinks * 2 phases * 0.3s = 1.8s)
    clock.update(105.0, False)
    assert clock.state == wecker.STATE_WAIT_FOR_INPUT

    # Press 1
    clock.update(105.5, True)
    clock.update(105.6, False)
    # Press 2
    clock.update(106.0, True)
    clock.update(106.1, False)
    # Press 3
    clock.update(106.5, True)
    clock.update(106.6, False)

    assert clock.user_presses == 3

    # Wait 3 seconds to evaluate
    clock.update(109.7, False)  # Triggers state change
    keep_running = clock.update(109.8, False)  # Triggers evaluation

    # It should evaluate, see it's correct, and return False (stop running)
    assert clock.state == wecker.STATE_EVALUATING
    assert not keep_running


def test_state_machine_incorrect(mock_gpio, mock_pygame):
    clock = wecker.AlarmClock()
    clock.state = wecker.STATE_WAIT_FOR_INPUT
    clock.target_blinks = 3

    # Only press once
    clock.update(100.0, True)
    clock.update(100.1, False)

    # Wait to evaluate
    clock.last_interaction_time = 100.1
    clock.update(103.2, False)  # triggers eval state
    keep_running = clock.update(103.3, False)  # evals to incorrect

    # Evaluated incorrectly, should wait before retry
    assert keep_running
    assert clock.state == wecker.STATE_WAIT_BEFORE_RETRY


def test_blinking_is_non_blocking(mock_gpio, mock_pygame):
    clock = wecker.AlarmClock()
    clock.state = wecker.STATE_BLINKING
    clock.target_blinks = 2

    # Start of blinking: LED on
    clock.update(100.0, False)
    assert clock.state == wecker.STATE_BLINKING
    mock_gpio.output.assert_called_with(wecker.LED_PIN, mock_gpio.LOW)

    # Mid-blink: LED toggles based on elapsed time
    clock.update(100.3, False)
    mock_gpio.output.assert_called_with(wecker.LED_PIN, mock_gpio.HIGH)

    # After sequence completes (2 blinks * 2 phases * 0.3s = 1.2s)
    clock.update(101.2, False)
    assert clock.state == wecker.STATE_WAIT_FOR_INPUT
    mock_gpio.output.assert_called_with(wecker.LED_PIN, mock_gpio.HIGH)


def test_blinking_updates_time_correctly(mock_gpio, mock_pygame):
    clock = wecker.AlarmClock()
    clock.state = wecker.STATE_BLINKING
    clock.target_blinks = 4

    # Start blinking, then advance to the end of the sequence.
    # 4 blinks * 2 phases * 0.3s = 2.4s
    clock.update(100.0, False)
    clock.update(102.4, False)

    assert clock.state == wecker.STATE_WAIT_FOR_INPUT
    assert clock.last_interaction_time == 102.4


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")
