import vlc


class AudioPlayer:
    def __init__(self, alsa_device=None):
        params = ["-A", "alsa", "--alsa-audio-device", alsa_device] if alsa_device else []
        self.instance = vlc.Instance(*params)
        self.media_list_player = self.instance.media_list_player_new()
        self.media_player = self.media_list_player.get_media_player()

        evm = self.media_player.event_manager()
        evm.event_attach(vlc.EventType.MediaPlayerStopped, self._callback)

        evm2 = self.media_list_player.event_manager()
        evm2.event_attach(vlc.EventType.MediaListPlayerPlayed, self._callback)
        evm2.event_attach(vlc.EventType.MediaListPlayerStopped, self._callback)

        self.on_playlist_end_callback = None

        self.volume_min = None
        self.volume_max = None

    def create_playlist(self, files):
        result = vlc.MediaList()
        for e in files:
            result.add_media(self.instance.media_new(e))

        evm = result.event_manager()
        evm.event_attach(vlc.EventType.MediaListEndReached,
                         lambda e: print("Ml CB", str(vlc.EventType(e.type))))
        evm.event_attach(vlc.EventType.MediaListItemAdded,
                         lambda e: print("Ml ia CB", str(vlc.EventType(e.type))))

        return result

    def set_playlist(self, media_list):
        self.media_list_player.set_media_list(media_list)
        print("Setting media list of length ", media_list.count())
        self.media_list_player.set_playback_mode(vlc.PlaybackMode.default)

    def next(self):
        return self.media_list_player.next()

    def previous(self):
        return self.media_list_player.previous()

    def play(self):
        self.media_list_player.play()

    def play_from_start(self):
        self.media_list_player.play_item_at_index(0)

    def is_playing(self):
        return self.media_list_player.is_playing()

    def pause(self):
        self.media_list_player.pause()

    def _callback(self, event, *args, **kwargs):
        eventStr = str(vlc.EventType(event.type))
        print(f"Got vlc event type {event.type} {eventStr} , event {event}")
        if event.type == vlc.EventType.MediaPlayerStopped:
            if self.on_playlist_end_callback:
                print("Calling playlist end cb")
                self.on_playlist_end_callback()
        #print("Callback from VLC", event, args, kwargs)
        #print(event.meta_type, event.obj, event.type)

    def set_volume(self, volume):
        if self.volume_min and volume < self.volume_min:
            volume = self.volume_min
        if self.volume_max and volume > self.volume_max:
            volume = self.volume_max
        self.media_player.audio_set_volume(volume)

    def set_volume_limits(self, vmin, vmax):
        self.volume_min = vmin
        self.volume_max = vmax

    def change_volume(self, amount=1):
        vol = self.media_player.audio_get_volume() + amount
        self.set_volume(vol)