#!/usr/bin/env python
from datetime import datetime
import os
import pwd
import subprocess
import time

LOG_FILE = os.path.expanduser('~/hours_log.csv')


cmd = subprocess.Popen(["dbus-monitor \"type='signal',interface="
                        "'org.freedesktop.ScreenSaver'\""], shell=True,
                       stdout=subprocess.PIPE)

running = 0
while 1:
    time.sleep(0.1)
    if running:
        output = cmd.stdout.readline()
        status = 'unlocked' if 'true' in output else 'locked'
        new_line = "{time} {user} {status} the screen\n".format(
            time=datetime.now().ctime(),
            user=pwd.getpwuid(os.getuid())[0],
            status=status
        )
        with open(LOG_FILE, 'a') as f:
            f.write(new_line)

        running = 0
    line = cmd.stdout.readline()
    if "ActiveChange" in line and 'org.freedesktop.ScreenSaver' in line:
        running = 1