import random
import time

from nose.plugins.skip import SkipTest

from mopidy.mixers.dummy import DummyMixer
from mopidy.models import Playlist, Track

def populate_playlist(func):
    def wrapper(self):
        for track in self.tracks:
            self.backend.current_playlist.add(track)
        return func(self)

    wrapper.__name__ = func.__name__
    wrapper.__doc__ = func.__doc__
    return wrapper


class BaseCurrentPlaylistControllerTest(object):
    tracks = []
    backend_class = None

    def setUp(self):
        self.backend = self.backend_class(mixer=DummyMixer())
        self.controller = self.backend.current_playlist
        self.playback = self.backend.playback

        assert len(self.tracks) >= 3, 'Need at least three tracks to run tests.'

    def tearDown(self):
        self.backend.destroy()

    def test_add(self):
        for track in self.tracks:
            self.controller.add(track)
            self.assertEqual(track, self.controller.playlist.tracks[-1])

    def test_add_at_position(self):
        for track in self.tracks[:-1]:
            self.controller.add(track, 0)
            self.assertEqual(track, self.controller.playlist.tracks[0])

    @populate_playlist
    def test_add_at_position_outside_of_playlist(self):
        test = lambda: self.controller.add(self.tracks[0], len(self.tracks)+2)
        self.assertRaises(AssertionError, test)

    @populate_playlist
    def test_add_sets_id_property(self):
        for track in self.controller.playlist.tracks:
            self.assertNotEqual(None, track.id)

    @populate_playlist
    def test_get_by_id(self):
        track = self.controller.playlist.tracks[1]
        self.assertEqual(track, self.controller.get(id=track.id))

    @populate_playlist
    def test_get_by_id_raises_error_for_invalid_id(self):
        self.assertRaises(LookupError, lambda: self.controller.get(id=1337))

    @populate_playlist
    def test_get_by_uri(self):
        track = self.controller.playlist.tracks[1]
        self.assertEqual(track, self.controller.get(uri=track.uri))

    @populate_playlist
    def test_get_by_uri_raises_error_for_invalid_id(self):
        self.assertRaises(LookupError, lambda: self.controller.get(uri='foobar'))

    @populate_playlist
    def test_clear(self):
        self.controller.clear()
        self.assertEqual(len(self.controller.playlist.tracks), 0)

    def test_clear_empty_playlist(self):
        self.controller.clear()
        self.assertEqual(len(self.controller.playlist.tracks), 0)

    @populate_playlist
    def test_clear_when_playing(self):
        self.playback.play()
        self.assertEqual(self.playback.state, self.playback.PLAYING)
        self.controller.clear()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    def test_load(self):
        new_playlist = Playlist()
        self.assertNotEqual(new_playlist, self.controller.playlist)
        self.controller.load(new_playlist)
        # FIXME how do we test this without going into internals?
        self.assertEqual(new_playlist, self.controller._playlist)

    def test_load_does_not_reset_version(self):
        version = self.controller.version

        self.controller.load(Playlist())
        self.assertEqual(self.controller.version, version+1)

    def test_load_appends(self):
        raise SkipTest

    @populate_playlist
    def test_load_preserves_playing_state(self):
        tracks = self.controller.playlist.tracks
        playback = self.playback

        self.playback.play()
        self.controller.load(Playlist(tracks=[tracks[1]]))
        self.assertEqual(playback.state, playback.PLAYING)
        self.assertEqual(tracks[1], self.playback.current_track)

    @populate_playlist
    def test_load_preserves_stopped_state(self):
        tracks = self.controller.playlist.tracks
        playback = self.playback

        self.controller.load(Playlist(tracks=[tracks[2]]))
        self.assertEqual(playback.state, playback.STOPPED)
        self.assertEqual(None, self.playback.current_track)

    @populate_playlist
    def test_move_single(self):
        self.controller.move(0, 0, 2)

        tracks = self.controller.playlist.tracks
        self.assertEqual(tracks[2], self.tracks[0])

    @populate_playlist
    def test_move_group(self):
        self.controller.move(0, 2, 1)

        tracks = self.controller.playlist.tracks
        self.assertEqual(tracks[1], self.tracks[0])
        self.assertEqual(tracks[2], self.tracks[1])

    @populate_playlist
    def test_moving_track_outside_of_playlist(self):
        tracks = len(self.controller.playlist.tracks)
        test = lambda: self.controller.move(0, 0, tracks+5)
        self.assertRaises(AssertionError, test)

    @populate_playlist
    def test_move_group_outside_of_playlist(self):
        tracks = len(self.controller.playlist.tracks)
        test = lambda: self.controller.move(0, 2, tracks+5)
        self.assertRaises(AssertionError, test)

    @populate_playlist
    def test_move_group_out_of_range(self):
        tracks = len(self.controller.playlist.tracks)
        test = lambda: self.controller.move(tracks+2, tracks+3, 0)
        self.assertRaises(AssertionError, test)

    @populate_playlist
    def test_move_group_invalid_group(self):
        tracks = len(self.controller.playlist.tracks)
        test = lambda: self.controller.move(2, 1, 0)
        self.assertRaises(AssertionError, test)

    def test_playlist_attribute_is_imutable(self):
        raise SkipTest # design decision needed

    @populate_playlist
    def test_remove(self):
        track1 = self.controller.playlist.tracks[1]
        track2 = self.controller.playlist.tracks[2]
        self.controller.remove(track1)
        self.assert_(track1 not in self.controller.playlist.tracks)
        self.assertEqual(track2, self.controller.playlist.tracks[1])

    @populate_playlist
    def test_removing_track_that_does_not_exist(self):
        test = lambda: self.controller.remove(Track())
        self.assertRaises(AssertionError, test)

    def test_removing_from_empty_playlist(self):
        test = lambda: self.controller.remove(Track())
        self.assertRaises(AssertionError, test)

    @populate_playlist
    def test_shuffle(self):
        random.seed(1)
        self.controller.shuffle()

        shuffled_tracks = self.controller.playlist.tracks

        self.assertNotEqual(self.tracks, shuffled_tracks)
        self.assertEqual(set(self.tracks), set(shuffled_tracks))

    @populate_playlist
    def test_shuffle_subset(self):
        random.seed(1)
        self.controller.shuffle(1, 3)

        shuffled_tracks = self.controller.playlist.tracks

        self.assertNotEqual(self.tracks, shuffled_tracks)
        self.assertEqual(self.tracks[0], shuffled_tracks[0])
        self.assertEqual(set(self.tracks), set(shuffled_tracks))

    @populate_playlist
    def test_shuffle_invalid_subset(self):
        test = lambda: self.controller.shuffle(3, 1)
        self.assertRaises(AssertionError, test)

    @populate_playlist
    def test_shuffle_superset(self):
        tracks = len(self.controller.playlist.tracks)
        test = lambda: self.controller.shuffle(1, tracks+5)
        self.assertRaises(AssertionError, test)

    def test_shuffle_open_subset(self):
        raise SkipTest

    def test_version(self):
        version = self.controller.version
        self.controller.playlist = Playlist()
        self.assertEqual(version+1, self.controller.version)


class BasePlaybackControllerTest(object):
    tracks = []
    backend_class = None

    def setUp(self):
        self.backend = self.backend_class(mixer=DummyMixer())
        self.playback = self.backend.playback

        assert len(self.tracks) >= 3, \
            'Need at least three tracks to run tests.'
        assert self.tracks[0].length >= 2000, \
            'First song needs to be at least 2000 miliseconds'

    def tearDown(self):
        self.backend.destroy()

    def test_initial_state_is_stopped(self):
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    def test_play_with_empty_playlist(self):
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.playback.play()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    def test_play_with_empty_playlist_return_value(self):
        self.assertEqual(self.playback.play(), None)

    @populate_playlist
    def test_play_state(self):
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.playback.play()
        self.assertEqual(self.playback.state, self.playback.PLAYING)

    @populate_playlist
    def test_play_return_value(self):
        self.assertEqual(self.playback.play(), None)

    @populate_playlist
    def test_play_track_state(self):
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.playback.play(self.tracks[-1])
        self.assertEqual(self.playback.state, self.playback.PLAYING)

    @populate_playlist
    def test_play_track_return_value(self):
        self.assertEqual(self.playback.play(self.tracks[-1]), None)

    @populate_playlist
    def test_play_when_playing(self):
        self.playback.play()
        track = self.playback.current_track
        self.playback.play()
        self.assertEqual(track, self.playback.current_track)

    @populate_playlist
    def test_play_when_paused(self):
        self.playback.play()
        track = self.playback.current_track
        self.playback.pause()
        self.playback.play()
        self.assertEqual(self.playback.state, self.playback.PLAYING)
        self.assertEqual(track, self.playback.current_track)

    @populate_playlist
    def test_play_sets_current_track(self):
        self.playback.play()
        self.assertEqual(self.playback.current_track, self.tracks[0])

    @populate_playlist
    def test_play_track_sets_current_track(self):
        self.playback.play(self.tracks[-1])
        self.assertEqual(self.playback.current_track, self.tracks[-1])

    @populate_playlist
    def test_current_track_after_completed_playlist(self):
        self.playback.play(self.tracks[-1])
        self.playback.seek(self.tracks[0].length - 1)
        time.sleep(0.2)
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.assertEqual(self.playback.current_track, None)

        self.playback.play(self.tracks[-1])
        self.playback.next()
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.assertEqual(self.playback.current_track, None)

    @populate_playlist
    def test_next(self):
        self.playback.play()

        old_position = self.playback.playlist_position
        old_uri = self.playback.current_track.uri

        self.playback.next()

        self.assertEqual(self.playback.playlist_position, old_position+1)
        self.assertNotEqual(self.playback.current_track.uri, old_uri)

    @populate_playlist
    def test_next_return_value(self):
        self.playback.play()
        self.assertEqual(self.playback.next(), None)

    @populate_playlist
    def test_next_does_not_trigger_playback(self):
        self.playback.next()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_next_at_end_of_playlist(self):
        self.playback.play()

        for i, track in enumerate(self.tracks):
            self.assertEqual(self.playback.state, self.playback.PLAYING)
            self.assertEqual(self.playback.current_track, track)
            self.assertEqual(self.playback.playlist_position, i)

            self.playback.next()

        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_next_until_end_of_playlist_and_play_from_start(self):
        self.playback.play()

        for track in self.tracks:
            self.playback.next()

        self.assertEqual(self.playback.current_track, None)
        self.assertEqual(self.playback.state, self.playback.STOPPED)

        self.playback.play()
        self.assertEqual(self.playback.state, self.playback.PLAYING)
        self.assertEqual(self.playback.current_track, self.tracks[0])

    def test_next_for_empty_playlist(self):
        self.playback.next()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_previous(self):
        self.playback.play()
        self.playback.next()
        self.playback.previous()
        self.assertEqual(self.playback.current_track, self.tracks[0])

    @populate_playlist
    def test_previous_more(self):
        self.playback.play() # At track 0
        self.playback.next() # At track 1
        self.playback.next() # At track 2
        self.playback.previous() # At track 1
        self.assertEqual(self.playback.current_track, self.tracks[1])

    @populate_playlist
    def test_previous_return_value(self):
        self.playback.play()
        self.playback.next()
        self.assertEqual(self.playback.previous(), None)

    @populate_playlist
    def test_previous_does_not_trigger_playback(self):
        self.playback.play()
        self.playback.next()
        self.playback.stop()
        self.playback.previous()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_previous_at_start_of_playlist(self):
        self.playback.previous()
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.assertEqual(self.playback.current_track, None)

    def test_previous_for_empty_playlist(self):
        self.playback.previous()
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.assertEqual(self.playback.current_track, None)

    @populate_playlist
    def test_next_track_before_play(self):
        self.assertEqual(self.playback.next_track, self.tracks[0])

    @populate_playlist
    def test_next_track_during_play(self):
        self.playback.play()
        self.assertEqual(self.playback.next_track, self.tracks[1])

    @populate_playlist
    def test_next_track_after_previous(self):
        self.playback.play()
        self.playback.next()
        self.playback.previous()
        self.assertEqual(self.playback.next_track, self.tracks[1])

    def test_next_track_empty_playlist(self):
        self.assertEqual(self.playback.next_track, None)

    @populate_playlist
    def test_next_track_at_end_of_playlist(self):
        self.playback.play()
        for track in self.tracks[1:]:
            self.playback.next()
        self.assertEqual(self.playback.next_track, None)

    @populate_playlist
    def test_next_track_at_end_of_playlist_with_repeat(self):
        self.playback.repeat = True
        self.playback.play()
        for track in self.tracks[1:]:
            self.playback.next()
        self.assertEqual(self.playback.next_track, self.tracks[0])

    @populate_playlist
    def test_next_track_with_random(self):
        random.seed(1)
        self.playback.random = True
        self.assertEqual(self.playback.next_track, self.tracks[2])

    @populate_playlist
    def test_previous_track_before_play(self):
        self.assertEqual(self.playback.previous_track, None)

    @populate_playlist
    def test_previous_track_after_play(self):
        self.playback.play()
        self.assertEqual(self.playback.previous_track, None)

    @populate_playlist
    def test_previous_track_after_next(self):
        self.playback.play()
        self.playback.next()
        self.assertEqual(self.playback.previous_track, self.tracks[0])

    @populate_playlist
    def test_previous_track_after_previous(self):
        self.playback.play() # At track 0
        self.playback.next() # At track 1
        self.playback.next() # At track 2
        self.playback.previous() # At track 1
        self.assertEqual(self.playback.previous_track, self.tracks[0])

    def test_previous_track_empty_playlist(self):
        self.assertEqual(self.playback.previous_track, None)

    @populate_playlist
    def test_previous_track_with_consume(self):
        self.playback.consume = True
        for track in self.tracks:
            self.playback.next()
            self.assertEqual(self.playback.previous_track,
                self.playback.current_track)

    @populate_playlist
    def test_previous_track_with_random(self):
        self.playback.repeat = True
        for track in self.tracks:
            self.playback.next()
            self.assertEqual(self.playback.previous_track,
                self.playback.current_track)

    @populate_playlist
    def test_initial_current_track(self):
        self.assertEqual(self.playback.current_track, None)

    @populate_playlist
    def test_current_track_during_play(self):
        self.playback.play()
        self.assertEqual(self.playback.current_track, self.tracks[0])

    @populate_playlist
    def test_current_track_after_next(self):
        self.playback.play()
        self.playback.next()
        self.assertEqual(self.playback.current_track, self.tracks[1])

    @populate_playlist
    def test_initial_playlist_position(self):
        self.assertEqual(self.playback.playlist_position, None)

    @populate_playlist
    def test_playlist_position_during_play(self):
        self.playback.play()
        self.assertEqual(self.playback.playlist_position, 0)

    @populate_playlist
    def test_playlist_position_after_next(self):
        self.playback.play()
        self.playback.next()
        self.assertEqual(self.playback.playlist_position, 1)

    def test_playlist_position_at_end_of_playlist(self):
        raise SkipTest

    def test_new_playlist_loaded_callback_gets_called(self):
        new_playlist_loaded_callback = self.playback.new_playlist_loaded_callback

        def wrapper():
            wrapper.called = True
            return new_playlist_loaded_callback()
        wrapper.called = False

        self.playback.new_playlist_loaded_callback = wrapper
        self.backend.current_playlist.load(Playlist())

        self.assert_(wrapper.called)

    @populate_playlist
    def test_end_of_track_callback_gets_called(self):
        end_of_track_callback = self.playback.end_of_track_callback

        def wrapper():
            wrapper.called = True
            return end_of_track_callback()
        wrapper.called = False

        self.playback.end_of_track_callback= wrapper

        self.playback.play()
        self.playback.seek(self.tracks[0].length - 1)
        time.sleep(0.2)

        self.assert_(wrapper.called)

    @populate_playlist
    def test_new_playlist_loaded_callback_when_playing(self):
        playlist = Playlist(tracks=[self.tracks[2]])
        self.playback.play()
        self.backend.current_playlist.load(playlist)
        self.assertEqual(self.playback.state, self.playback.PLAYING)
        self.assertEqual(self.playback.current_track, self.tracks[2])

    @populate_playlist
    def test_new_playlist_loaded_callback_when_stopped(self):
        playlist = Playlist(tracks=[self.tracks[2]])
        self.backend.current_playlist.load(playlist)
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.assertEqual(self.playback.current_track, None)
        self.assertEqual(self.playback.next_track, self.tracks[2])

    @populate_playlist
    def test_new_playlist_loaded_callback_when_paused(self):
        playlist = Playlist(tracks=[self.tracks[2]])
        self.playback.play()
        self.playback.pause()
        self.backend.current_playlist.load(playlist)
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.assertEqual(self.playback.current_track, None)
        self.assertEqual(self.playback.next_track, self.tracks[2])

    @populate_playlist
    def test_pause_when_stopped(self):
        self.playback.pause()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_pause_when_playing(self):
        self.playback.play()
        self.playback.pause()
        self.assertEqual(self.playback.state, self.playback.PAUSED)

    @populate_playlist
    def test_pause_when_paused(self):
        self.playback.play()
        self.playback.pause()
        self.playback.pause()
        self.assertEqual(self.playback.state, self.playback.PAUSED)

    @populate_playlist
    def test_pause_return_value(self):
        self.playback.play()
        self.assertEqual(self.playback.pause(), None)

    @populate_playlist
    def test_resume_when_stopped(self):
        self.playback.resume()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_resume_when_playing(self):
        self.playback.play()
        self.playback.resume()
        self.assertEqual(self.playback.state, self.playback.PLAYING)

    @populate_playlist
    def test_resume_when_paused(self):
        self.playback.play()
        self.playback.pause()
        self.playback.resume()
        self.assertEqual(self.playback.state, self.playback.PLAYING)

    @populate_playlist
    def test_resume_return_value(self):
        self.playback.play()
        self.playback.pause()
        self.assertEqual(self.playback.resume(), None)

    @populate_playlist
    def test_resume_continues_from_right_position(self):
        self.playback.play()
        time.sleep(0.2)
        self.playback.pause()
        self.playback.resume()
        self.assertNotEqual(self.playback.time_position, 0)

    @populate_playlist
    def test_seek_when_stopped(self):
        self.playback.seek(1000)
        position = self.playback.time_position
        self.assert_(position >= 990, position)

    def test_seek_on_empty_playlist(self):
        self.playback.seek(0)
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_seek_when_stopped_triggers_play(self):
        self.playback.seek(0)
        self.assertEqual(self.playback.state, self.playback.PLAYING)

    @populate_playlist
    def test_seek_when_playing(self):
        length = self.backend.current_playlist.playlist.tracks[0].length
        self.playback.play()
        self.playback.seek(length - 1000)
        position = self.playback.time_position
        self.assert_(position >= length - 1010, position)

    @populate_playlist
    def test_seek_when_paused(self):
        length = self.backend.current_playlist.playlist.tracks[0].length
        self.playback.play()
        self.playback.pause()
        self.playback.seek(length - 1000)
        position = self.playback.time_position
        self.assert_(position >= length - 1010, position)

    @populate_playlist
    def test_seek_when_paused_triggers_play(self):
        self.playback.play()
        self.playback.pause()
        self.playback.seek(0)
        self.assertEqual(self.playback.state, self.playback.PLAYING)

    @populate_playlist
    def test_seek_beyond_end_of_song(self):
        self.playback.play()
        self.playback.seek(self.tracks[0].length*100)
        self.assertEqual(self.playback.current_track, self.tracks[1])

    @populate_playlist
    def test_seek_beyond_end_of_song_for_last_track(self):
        self.playback.play(self.tracks[-1])
        self.playback.seek(self.tracks[-1].length*100)
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_seek_beyond_start_of_song(self):
        self.playback.play()
        self.playback.seek(-1000)
        position = self.playback.time_position
        self.assert_(position >= 0, position)
        self.assertEqual(self.playback.state, self.playback.PLAYING)

    @populate_playlist
    def test_seek_return_value(self):
        self.playback.play()
        self.assertEqual(self.playback.seek(0), None)

    @populate_playlist
    def test_stop_when_stopped(self):
        self.playback.stop()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_stop_when_playing(self):
        self.playback.play()
        self.playback.stop()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    @populate_playlist
    def test_stop_when_paused(self):
        self.playback.play()
        self.playback.pause()
        self.playback.stop()
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    def test_stop_return_value(self):
        self.playback.play()
        self.assertEqual(self.playback.stop(), None)

    def test_time_position_when_stopped(self):
        self.assertEqual(self.playback.time_position, 0)

    @populate_playlist
    def test_time_position_when_stopped_with_playlist(self):
        self.assertEqual(self.playback.time_position, 0)

    @populate_playlist
    def test_time_position_when_playing(self):
        self.playback.play()
        time.sleep(0.2)
        first = self.playback.time_position
        time.sleep(0.2)
        second = self.playback.time_position

        self.assert_(second > first, '%s - %s' % (first, second))

    @populate_playlist
    def test_time_position_when_paused(self):
        self.playback.play()
        time.sleep(0.2)
        self.playback.pause()
        first = self.playback.time_position
        second = self.playback.time_position

        self.assertEqual(first, second)

    @populate_playlist
    def test_play_with_consume(self):
        self.playback.consume = True
        self.playback.play()
        self.assertEqual(self.playback.current_track, self.tracks[0])

    @populate_playlist
    def test_next_with_consume(self):
        self.playback.consume = True
        self.playback.play()
        self.playback.next()
        tracks = self.backend.current_playlist.playlist.tracks
        self.assert_(self.tracks[0] not in tracks)

    @populate_playlist
    def test_play_with_random(self):
        random.seed(1)
        self.playback.random = True
        self.playback.play()
        self.assertEqual(self.playback.current_track, self.tracks[2])

    @populate_playlist
    def test_next_with_random(self):
        # FIXME feels very fragile
        random.seed(1)
        self.playback.random = True
        self.playback.play()
        self.playback.next()
        self.assertEqual(self.playback.current_track, self.tracks[1])

    @populate_playlist
    def test_previous_with_random(self):
        random.seed(1)
        self.playback.random = True
        self.playback.play()
        self.playback.next()
        current_track = self.playback.current_track
        self.playback.previous()
        self.assertEqual(self.playback.current_track, current_track)

    @populate_playlist
    def test_end_of_song_starts_next_track(self):
        self.playback.play()
        self.playback.seek(self.tracks[0].length - 1)
        time.sleep(0.2)
        self.assertEqual(self.playback.current_track, self.tracks[1])

    @populate_playlist
    def test_end_of_playlist_stops(self):
        self.playback.play(self.tracks[-1])
        self.playback.seek(self.tracks[-1].length - 1)
        time.sleep(0.2)
        self.assertEqual(self.playback.state, self.playback.STOPPED)

    def test_repeat_off_by_default(self):
        self.assertEqual(self.playback.repeat, False)

    def test_random_off_by_default(self):
        self.assertEqual(self.playback.random, False)

    def test_consume_off_by_default(self):
        self.assertEqual(self.playback.consume, False)

    @populate_playlist
    def test_random_until_end_of_playlist(self):
        self.playback.random = True
        self.playback.play()
        for track in self.tracks[1:]:
            self.playback.next()
        self.assertEqual(self.playback.next_track, None)

    @populate_playlist
    def test_random_until_end_of_playlist_and_play_from_start(self):
        self.playback.repeat = True
        for track in self.tracks:
            self.playback.next()
        self.assertNotEqual(self.playback.next_track, None)
        self.assertEqual(self.playback.state, self.playback.STOPPED)
        self.playback.play()
        self.assertEqual(self.playback.state, self.playback.PLAYING)

    @populate_playlist
    def test_random_until_end_of_playlist_with_repeat(self):
        self.playback.repeat = True
        self.playback.random = True
        for track in self.tracks:
            self.playback.next()
        self.assertNotEqual(self.playback.next_track, None)

    @populate_playlist
    def test_next_track_with_random_after_load_playlist(self):
        random.seed(1)
        self.playback.random = True
        self.assertEqual(self.playback.next_track, self.tracks[2])
        self.backend.current_playlist.load(Playlist(tracks=self.tracks[:1]))
        self.assertEqual(self.playback.next_track, self.tracks[0])

    @populate_playlist
    def test_played_track_during_random_not_played_again(self):
        self.playback.random = True
        self.playback.play()
        played = []
        for track in self.tracks:
            self.assert_(self.playback.current_track not in played)
            played.append(self.playback.current_track)
            self.playback.next()