#!/usr/bin/python3

import sys
import time
import os
import signal


def stop_cams():
    f = open("/tmp/pid_1", "r")
    pid1 = int(f.read())
    f.close()
    f = open("/tmp/pid_2", "r")
    pid2 = int(f.read())
    f.close()

    os.kill(pid1, signal.SIGINT)
    os.kill(pid2, signal.SIGINT)

def read_old_time():
    f = open("/tmp/sensor", "r")
    sensor_time = int(f.read())
    f.close()
    return sensor_time


def main():
    # minimum write time
    record_time = 60

    os.system("echo 0 > /tmp/sensor")
    #os.system("./read_sensor.py &")

    while (True):
        time.sleep(1)
        print (int(time.time()) - read_old_time())

        if ((int(time.time()) - read_old_time()) <= record_time):
            print("Wait to start camera script.")
            os.system("./cam1.sh")
            os.system("./cam2.sh")            
            time.sleep(10)
            
            print("Start min write.")
            time.sleep(record_time)

            while ((int(time.time()) - read_old_time()) < record_time):
                t = read_old_time() - (int(time.time()) - record_time)
                print("Continue record video on camera -> " + str(t) + ".")
                time.sleep(t)
                
            print("Wait to stop camera script.")
            stop_cams()
            time.sleep(10)
            print("Stop camera script.")

if __name__ == '__main__':
    main()