#!/usr/bin/python2
import RPi.GPIO as GPIO
import time
import threading
from subprocess import call

PIR_PIN = 18
TIMER = None
TIMEOUT=60*10

def handleEdge(pin):
    if(GPIO.input(pin) == 1):
        handleMotion()
    else:
        handleAbsense()

def handleMotion():
    global TIMER
    stopTimer()
    call(['vcgencmd','display_power','1'])

def handleAbsense():
    startTimer()

def stopTimer():
    global TIMER
    if TIMER:
        TIMER.cancel()
        TIMER = None

def startTimer():
    global TIMER
    stopTimer()
    TIMER = threading.Timer(TIMEOUT, handleShutdown)
    TIMER.start()

def handleShutdown():
    global TIMER
    TIMER.cancel();
    TIMER = None
    call(['vcgencmd','display_power','0'])

def main():
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(PIR_PIN, GPIO.IN)

    GPIO.add_event_detect(PIR_PIN, GPIO.BOTH, callback=handleEdge)

    # main loop
    while True:
        time.sleep(0.1)

    GPIO.cleanup()

if __name__ == "__main__":
    main()