text: import time
  import logging
  import random
  import os
  import argparse
  
  import RPi.GPIO as gpio
  import alsaaudio as alsa
  import vlc
  import pydbus
  
  
  class Consts:
      PIN_HANDLERS = ['play', 'volume_up', 'volume_down']
      DEFAULT_PINS = [7, 11, 13]
  
      BLUETOOTH_PROFILE = 'bluealsa'
      BASE_VOLUME = 40
      VOLUME_STEP = 5
      SONGS_PATH = '/home/pi/songs'
      DEFAULT_VERBOSITY = 'info'
      VERBOSITY_OPTIONS = ('info', 'debug')
      PLAYABLE_FILE_TYPES = ('.mp3', '.m4a', '.webm', '.wav', '.aac', '.ogg')
      DEFAULT_PLAYER_ARGS = ['--aout=alsa']
  
  
  class JukeBox:
      def __init__(self):
          self.macaddr = None
          self.bt_profile = Consts.BLUETOOTH_PROFILE
          self.start_volume = Consts.BASE_VOLUME
          self.songs_dir = Consts.SONGS_PATH
          self.pins = Consts.DEFAULT_PINS
          self.verbosity = Consts.DEFAULT_VERBOSITY
          self.logger = logging.getLogger(__name__)
  
          self._parse_args()
  
          self.logger.setLevel(self.verbosity.upper())
  
          self.bluetooth = self.Bluetooth(mac_address=self.macaddr)
          self._setup_bluetooth()
  
          self.audio = self.Audio(control=f'{self.bluetooth.name} - A2DP',
                                  device=self.bt_profile)
          self._setup_sound()
  
          self.player = self.Player(audio_device=self.bt_profile)
          self._setup_player()
  
          self._setup_gpio()
  
      def _parse_args(self):
          parser = argparse.ArgumentParser(description='PiZero JukeBox')
          parser.add_argument('-m', '--macaddr', required=True,
                              help="An already paired Bluetooth device's MAC address")
          parser.add_argument('-b', '--bt-profile', default=self.bt_profile,
                              help='Bluetooth profile name as configured in ALSA (~/.asoundrc)')
          parser.add_argument('-o', '--start-volume', type=int, default=self.start_volume,
                              help='Default volume level')
          parser.add_argument('-s', '--songs-dir', default=self.songs_dir,
                              help='Root directory for songs')
          parser.add_argument('-p', '--pins', nargs=3, default=self.pins,
                              help='Pins layout in order of play volume-up volume-down')
          parser.add_argument('-v', '--verbosity', default=self.verbosity,
                              choices=Consts.VERBOSITY_OPTIONS, help='Verbosity level')
          args = parser.parse_args()
          self.__dict__.update(vars(args))
  
      def _setup_bluetooth(self):
          self.bluetooth.initialize()
          self.bluetooth.connect()
  
      def _setup_sound(self):
          self.audio.initialize()
          self.audio.unmute()
          self.audio.set_volume(self.start_volume)
  
      def _setup_player(self):
          def song_finished_callback(event):
              self.player.finished = True
  
          self.player.initialize()
          self.play_next()
          self.player.events.event_attach(eventtype=vlc.EventType.MediaPlayerEndReached,
                                          callback=song_finished_callback)
  
      def _setup_gpio(self):
          gpio.setwarnings(False)
          gpio.setmode(gpio.BOARD)
  
          for pin in self.pins:
             gpio.setup(pin, gpio.IN, pull_up_down=gpio.PUD_DOWN)
  
      def get_song(self):
          files = []
          for root, _, f in os.walk(self.songs_dir):
              f = filter(lambda f: f.endswith(Consts.PLAYABLE_FILE_TYPES), f)
              files.extend(map(lambda x: os.path.join(root, x), f))
          return random.choice(files)
  
      def play_next(self, file=None):
          if not file:
              file = self.get_song()
          self.player.load_file(file)
          self.player.play()
          self.player.finished = False
  
      def play_handler(self):
          self.player.pause()
  
      def volume_up_handler(self):
          self.audio.set_volume(f'+{Consts.VOLUME_STEP}')
  
      def volume_down_handler(self):
          self.audio.set_volume(f'-{Consts.VOLUME_STEP}')
  
      def run(self):
          try:
              counter = 0
              while True:
                  time.sleep(0.1)
  
                  if counter % 20 == 0:
                      counter = 1
  
                      if not self.bluetooth.connected:
                          self.player.stop()
                          self._setup_bluetooth()
                          self._setup_sound()
                          self._setup_player()
  
                  counter += 1
  
                  if self.player.finished:
                      self.play_next()
  
                  for pin, handler in zip(self.pins, Consts.PIN_HANDLERS):
                      if gpio.input(pin):
                          getattr(self, f'{handler}_handler')()
  
                          # Neglect further actions while button is pressed
                          while gpio.input(pin):
                              time.sleep(0.3)
          except KeyboardInterrupt:
              self.logger.info('buh-bye')
          finally:
              gpio.cleanup()
  
      class Bluetooth:
          def __init__(self, mac_address):
              self.mac_address = mac_address
              self.bus = pydbus.SystemBus()
              self.device = None
              self.logger = logging.getLogger(__name__)
  
          def _get_device(self):
              try:
                  mac_address_conv = self.mac_address.replace(':', '_')
                  device = self.bus.get('org.bluez',
                                        f'/org/bluez/hci0/dev_{mac_address_conv}')
              except ValueError:
                  raise
  
              return device
  
          def initialize(self):
              self.device = self._get_device()
  
          def connect(self):
              while not self.connected:
                  self.logger.info(
                      f'Device {self.name} ({self.mac_address}) is disconnected. Trying to reconnect...')
                  try:
                      self.device.connect()
                  except AttributeError as e:
                      self.logger.error(e)
                      pass
                  time.sleep(3)
  
              self.logger.info(
                  f'Device {self.name} ({self.mac_address}) is connected!')
  
          def __getattr__(self, attr):
              try:
                  return object.__getattribute__(self, attr)
              except AttributeError:
                  self.logger.debug(f'Bluetooth device action received: {attr}')
                  return getattr(self.device, attr.title())
  
      class Audio:
          def __init__(self, **kwargs):
              self.mixer = None
              self.kwargs = kwargs
              self.logger = logging.getLogger(__name__)
  
          def _get_mixer(self):
              while True:
                  try:
                      mixer = alsa.Mixer(**self.kwargs)
                      break
                  except alsa.ALSAAudioError as e:
                      self.logger.error(e)
                      time.sleep(3)
  
              return mixer
  
          def initialize(self):
              self.mixer = self._get_mixer()
  
          def unmute(self):
              self.mixer.setmute(0)
              self.logger.debug(f'Unmuted {self.mixer.mixer()}')
  
          def toggle_mute(self):
              self.mixer.setmute(0 if all(self.mixer.getmute()) else 1)
              self.logger.debug(f'Toggled mute for {self.mixer.mixer()}')
  
          def set_volume(self, volume):
              if isinstance(volume, str):
                  if volume.startswith(('+', '-')):
                      current_volume = max(self.mixer.getvolume())
                      operator, new_volume = volume[0], volume[1:]
                      volume = eval(f'{current_volume}{operator}{new_volume}')
                  else:
                      volume = int(volume)
  
              volume = max(0, min(100, volume))  # Ensure we're in the 0 to 100 range
              self.mixer.setvolume(volume)
              self.logger.debug(
                  f'Set volume for {self.mixer.mixer()} to {volume}')
  
      class Player:
          def __init__(self, player_args=[], audio_device=None):
              self.args = player_args or Consts.DEFAULT_PLAYER_ARGS
  
              if audio_device:
                  self.args.append(f'--alsa-audio-device={audio_device}')
  
              self.instance = self.player = self.events = self.finished = None
  
              self.logger = logging.getLogger(__name__)
  
          def initialize(self):
              self.instance = vlc.Instance(' '.join(self.args))
              self.player = self.instance.media_player_new()
              self.events = self.player.event_manager()
              self.finished = False
  
          def load_file(self, file):
              media = self.instance.media_new_path(file)
              self.player.set_media(media)
              self.logger.info(f'Loaded file {file}')
  
          def __getattr__(self, attr):
              try:
                  return object.__getattribute__(self, attr)
              except AttributeError:
                  self.logger.debug(f'Player action received: {attr}')
                  return getattr(self.player, attr)
  