import os
import picamera
import RPi.GPIO as GPIO
import time
import datetime

sensor = 23
busy = False
#dirMax = 1000000000
dirMax = 10000000

GPIO.setmode(GPIO. BCM)
GPIO.setwarnings(False)   
GPIO.setup(sensor, GPIO.IN, pull_up_down = GPIO.PUD_UP)
 
def fileErace(dp):
    files = os.listdir(dp)
    files.sort()
    os.remove(dp + files[0])
    return

def dirSize():
    getSize = 0
    dirPath = '/home/pi/recording/'
    dirList = os.listdir(dirPath)
    for filename in dirList:
        getSize += os.path.getsize(os.path.join(dirPath,filename))
    if getSize > dirMax:
        fileErace(dirPath)
    return

def cameraOn():
    with picamera.PiCamera() as camera:
        camera.resolution = (640, 480)
        camera.start_preview()
        time.sleep(2)
        camera.start_recording(filename)
        camera.wait_recording(5)
        camera.stop_recording()
        dirSize()
        return False

try:
    while True:
        today = datetime.datetime.now()
        filename = '/home/pi/recording/' + today.strftime('%Y%m%d-%H:%M:%S') + '.h264'
        value=GPIO.input(sensor)
        if value != 0 and busy != True:
            print('CAMERA ON')
            busy = cameraOn()
            print('CAMERA OFF')
        else:
            print('NO DETECT')

        time.sleep(1)

except KeyboardInterrupt:
    pass
GPIO.cleanup()