#!/usr/bin/python

"""
OBS countdown timer for OBS
"""

import argparse
import os
import time

TIMER_FILE = '/home/kleph/stream/timer.txt'

parser = argparse.ArgumentParser()
parser.add_argument('-t', '--timer', help="start time in seconds", type=int, default=300)
parser.add_argument('-f', '--file', help="where to write the time", type=str, default=TIMER_FILE)
args = parser.parse_args()


def write_countdown(filename, stimer):
    """ decrease counter anf write synchronously to dest file """
    tsec = stimer
    with open(filename, 'w') as destfile:
        while tsec > 0:
            tsec -= 1
            minutes, sec = divmod(tsec, 60)
            print(f'{minutes:02d}:{sec:02d}')
            destfile.seek(0)
            destfile.write(f'{minutes:02d}:{sec:02d}')
            os.fsync(destfile)
            time.sleep(1)


write_countdown(args.file, args.timer)