import pytest

from notifier import Notifier
from player_mock import Player

@pytest.fixture
def mockPlayer():
    return Player()

@pytest.fixture
def uut(mockPlayer):
    return Notifier(mockPlayer)

def test_allEvents(uut):
    def checkEvent(uut, event):
        callbacks = 2
        calledFlags = [False] * callbacks
        values = [None] * callbacks

        def createCallback(i):
            def cb(value):
                nonlocal calledFlags, values
                calledFlags[i] = True
                values[i] = value

            return cb

        for i in range(0, callbacks):
            uut.registerCallback(event, createCallback(i))

        assert not any(calledFlags)
        uut.notify(event, 123)
        assert all(calledFlags)
        assert values == [123] * callbacks

    checkEvent(uut, Notifier.PLAYING_STATE_EVENT)
    checkEvent(uut, Notifier.PLAYBACK_VOLUME_EVENT)
    checkEvent(uut, Notifier.PLAYBACK_RATE_EVENT)
    checkEvent(uut, Notifier.CURRENT_SONG_EVENT)
    checkEvent(uut, Notifier.CURRENT_AB_EVENT)

def test_eventWithoutRegisteredCallbacks(uut):
    uut.notify(Notifier.PLAYING_STATE_EVENT, 0)
    # expect no crash

def test_eventsWithMockPlayer(uut, mockPlayer):
    def checkEvent(eventCode, simulateEvent, expectedValue):
        called = False
        receivedValue = None
        def callback(value):
            nonlocal called, receivedValue
            called = True
            receivedValue = value

        uut.registerCallback(eventCode, callback)

        assert not called
        simulateEvent()
        assert called
        assert receivedValue == expectedValue

    mockPlayer.state = 1
    mockPlayer.volume = 75

    checkEvent(Notifier.PLAYING_STATE_EVENT, mockPlayer.simulatePlayingStateChanged, True)
    checkEvent(Notifier.PLAYBACK_VOLUME_EVENT, mockPlayer.simulatePlaybackVolumeChanged, 75)

def test_singleEventNotification(uut):
    playingStateCalled = False
    def playingStateCallback(value):
        nonlocal playingStateCalled
        playingStateCalled = True

    volumeCalled = False
    def volumeCallback(value):
        nonlocal volumeCalled
        volumeCalled = True

    uut.registerCallback(Notifier.PLAYING_STATE_EVENT, playingStateCallback)
    uut.registerCallback(Notifier.PLAYBACK_VOLUME_EVENT, volumeCallback)

    assert not playingStateCalled
    assert not volumeCalled

    uut.notify(Notifier.PLAYING_STATE_EVENT, 0)
    assert playingStateCalled
    assert not volumeCalled

    playingStateCalled = False

    uut.notify(Notifier.PLAYBACK_VOLUME_EVENT, 0)
    assert not playingStateCalled
    assert volumeCalled

    volumeCalled = False

    uut.notify(Notifier.PLAYBACK_RATE_EVENT, 0)
    assert not playingStateCalled
    assert not volumeCalled