# For running this code you need a working MPD installation (set the right address and port in the switch function) as well as a KY-40 or similar rotary encoder connected to the right pins on your Raspberry Pi. 

from mpd import MPDClient
import atexit
import RPi.GPIO as GPIO
from time import sleep

GPIO.setmode(GPIO.BCM)

#Setup rotary encoder
pinA = 24 # Connect to CLK
pinB = 23 # Connect to DATA

GPIO.setup(pinA, GPIO.IN, pull_up_down = GPIO.PUD_UP)
GPIO.setup(pinB, GPIO.IN, pull_up_down = GPIO.PUD_UP)

encoderPos = 0

#Take care we exit gracefully
def cleanup():
	print("Exiting ...")
	GPIO.cleanup()

#Callback function when the knob moves
def detectrotation(pin):
	if (GPIO.input(pinA) == 0):		
		if (GPIO.input(pinB) == 1):
			switch(1) #Clockwise
		else:
			switch(0) #Counterclockwise

#Switching channels
def switch(direction):
	global encoderPos
	
	client = MPDClient()
	client.connect('localhost', 6600)
	client.clear()
	client.load("somafm")
	
	if (direction == 1): #Clockwise
		if (encoderPos < len(client.playlistinfo())):
			encoderPos += 1
			client.play(encoderPos)
			print("Now playing: " + str(client.currentsong()['file']))
		else: 
			print("End of playlist")
			encoderPos = len(client.playlistinfo())
	elif (direction == 0): #Counterclockwise
		if (encoderPos > 0):
			encoderPos -= 1
			client.play(encoderPos)
			print("Now playing: " + str(client.currentsong()['file']))
		else: 
			print ("End of playlist")
			encoderPos = 0
	else: #Resume
		if (encoderPos < len(client.playlistinfo())):		
			print("Resuming ...")		
			client.play(encoderPos)
			print("Now playing: " + str(client.currentsong()['file']))
		else: 
			print("End of playlist")
			encoderPos = len(client.playlistinfo())
	
	client.close()
	client.disconnect()

atexit.register(cleanup)
GPIO.add_event_detect(pinA, GPIO.FALLING, callback=detectrotation, bouncetime=250)
switch(-1) #Just resume

while True:
	sleep(0.01)