# piplayer4 - AudioLauncher
# http://www.tilman.de/piplayer4

import RPi.GPIO as GPIO
import logging
import time
import subprocess
import select  # for polling zbarcam, see http://stackoverflow.com/a/10759061/3761783
import os
import urllib
from socketIO_client import SocketIO, LoggingNamespace # https://gist.github.com/ivesdebruycker/4b08bdd5415609ce95e597c1d28e9b9e


logging.basicConfig(level=logging.INFO, format='%(asctime)s %(levelname)s - %(message)s')
logging.info('Initializing TEST')

# Configuration
MUSIC_BASE_DIRECTORY = "mnt/NAS/"
SOUND_SCANNING = "~/sounds/scanning.mp3"
SOUND_OK = "~/sounds/ok.mp3"
SOUND_SCAN_FAIL = "~/sounds/fail.mp3"
SOUND_PLAYBACK_ERROR = "~/sounds/error.mp3"
QR_SCANNER_TIMEOUT = 3


# photo sensor on PIN 17
PIN_SENSOR = 4 # TEST

# IR LED on PIN 22
PIN_IR_LED = 22

# LED on PIN 27
PIN_LED = 27

# Buttons on PINs 9, 10 and 11
PIN_PREV = 9
PIN_PLAY = 10
PIN_NEXT = 11


GPIO.setmode(GPIO.BCM)
GPIO.setup(PIN_SENSOR, GPIO.IN, pull_up_down=GPIO.PUD_UP) # TEST
GPIO.setup(PIN_IR_LED, GPIO.OUT)
GPIO.output(PIN_IR_LED, GPIO.LOW)
GPIO.setup(PIN_LED, GPIO.OUT)
GPIO.output(PIN_LED, GPIO.LOW)
GPIO.setup(PIN_PREV, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(PIN_PLAY, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(PIN_NEXT, GPIO.IN, pull_up_down=GPIO.PUD_UP)


pending_play = False # to determine whether we should send a play command when we receive a pushQueue event
is_paused = True # for toggling play/pause

socketIO = SocketIO('127.0.0.1', 3000)


def play_sound(filename):
    socketIO.emit('clearQueue')
    logging.debug('Cleared queue, now playing ' + filename)
    pending_play = True
    socketIO.emit('addToQueue', {'uri':filename})

def prev_callback(channel):
    logging.info("PREVIOUS")
    socketIO.emit('previous')
    ## TODO implement seek
     
def play_callback(channel):
    if (is_paused):
        logging.info("PLAY")
        socketIO.emit('play')
        is_paused = False
    else:
        logging.info("PAUSE")
        socketIO.emit('pause')
        is_paused = True

def next_callback(channel):
    logging.info("NEXT")
    socketIO.emit('next')
    ## TODO implement seek

def on_pushQueue(*args):
    logging.debug("pushQueue: " + args[0])
    if pending_play:
        if not args[0]:
            play_sound(SOUND_PLAYBACK_ERROR)
        else:
            socketIO.emit('play')
            pending_play = False


GPIO.add_event_detect(PIN_PREV, GPIO.FALLING, callback=prev_callback, bouncetime=400)
GPIO.add_event_detect(PIN_PLAY, GPIO.FALLING, callback=play_callback, bouncetime=400)
GPIO.add_event_detect(PIN_NEXT, GPIO.FALLING, callback=next_callback, bouncetime=400)


try:
    # play_sound(SOUND_OK)

    #socketIO.on('pushQueue', on_pushQueue)
    
    while True:
        logging.info('Wait for photo sensor')
        GPIO.wait_for_edge(PIN_SENSOR, GPIO.FALLING) # TEST
        
        logging.info('Photo sensor active, activating light and camera')
        #play_sound(SOUND_SCANNING)
        
        # turn LED on
        GPIO.output(PIN_LED, GPIO.HIGH)
        
        # scan QR code
        zbarcam = subprocess.Popen(['zbarcam', '--quiet', '--nodisplay', '--raw', '-Sdisable', '-Sqrcode.enable', '--prescale=320x240', '/dev/video0'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        
        poll_obj = select.poll()
        poll_obj.register(zbarcam.stdout, select.POLLIN)
        
        # wait for scan result (or timeout)
        start_time = time.time()
        poll_result = False
        while ((time.time() - start_time) < QR_SCANNER_TIMEOUT and (not poll_result)):
            poll_result = poll_obj.poll(100)

        if (poll_result):
            
            # play confirmation sound
            #play_sound(SOUND_OK)
            #socketIO.emit('removeFromQueue', 0)
            
            qr_code = zbarcam.stdout.readline().rstrip()
            qr_code = qr_code.decode("utf-8") # python3
            logging.info("QR Code: " + qr_code)
            
            pending_play = True
            
            if (not qr_code.startswith("http://")):
                # create full path
                if (qr_code.startswith("/")):
                    qr_code = qr_code[1:]
                full_path = MUSIC_BASE_DIRECTORY + qr_code
                logging.info("full_path: " + full_path)
                socketIO.emit('addToQueue', {'uri':full_path})
            else:
                socketIO.emit('addToQueue', {'service':'webradio','uri':qr_code})
            
            ###########socketIO.wait()
#https://github.com/invisibleroads/socketIO-client/issues/145
#https://github.com/miguelgrinberg/Flask-SocketIO/issues/194
            socketIO.emit('play')
            
        else:
            logging.warning('Timeout on zbarcam')
            play_sound(SOUND_SCAN_FAIL)
            
        zbarcam.terminate()
        GPIO.output(PIN_LED, GPIO.LOW)

        # wait until sensor is not blocked anymore
        if (GPIO.input(PIN_SENSOR) == GPIO.HIGH):
            GPIO.wait_for_edge(PIN_SENSOR, GPIO.FALLING)
            time.sleep(1)

        
# Exit when Ctrl-C is pressed
except KeyboardInterrupt:
    logging.info('Shutdown')
    
finally:
    logging.info('Reset GPIO configuration and close')
    GPIO.cleanup()