#####
# # enable ssh at http://volumio.local/dev 
# 
# # fix sources https://forums.raspberrypi.com/viewtopic.php?t=320294#p1918001
# sudo apt-get update
# 
# sudo apt-get install python3-dev python3-rpi.gpio
# sudo apt-get install python3-pip
# pip3 install python-socketio==4.6.1    # https://community.volumio.com/t/cannot-connect-to-volumio-using-pythons-socketio-client/67479/2
# # https://python-socketio.readthedocs.io/en/v4/client.html#creating-a-client-instance
#####


import RPi.GPIO as GPIO
import socketio

GPIO.setmode(GPIO.BOARD)

sio = socketio.Client()
sio.connect('http://localhost:3000')

status = 'pause'

def button_pressed(channel):
  if channel == 11:
    print('next')
    sio.emit('next')
  elif channel == 13:
#    print('state', status)
    if status == 'play':
      print('pause')
      sio.emit('pause')
    else:
      print('play')
      sio.emit('play')
  elif channel == 15:
    print('prev')
    sio.emit('prev')

def setup_channel(channel):
  try: 
    print("register %d" %channel)
    GPIO.setup(channel, GPIO.IN, GPIO.PUD_UP)
    GPIO.add_event_detect(channel, GPIO.FALLING, callback = button_pressed, bouncetime = 400)
    print('success')
  except (ValueError, RuntimeError) as e:
    print('ERROR:', e)

for x in [11, 13, 15]:
  setup_channel(x)


@sio.on('pushState')
def on_push_state(*args):
  global status
  status = args[0]['status']
  print(status)

# get initial state
sio.emit('getState')

try:
  while True : pass
except:
  GPIO.cleanup()