#!/usr/bin/python3
#
# This file is part of FreedomBox.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

"""
Set time zones with timedatectl (requires root permission).
"""

import argparse
import subprocess
import sys


def parse_arguments():
    """Return parsed command line arguments as dictionary."""
    parser = argparse.ArgumentParser()
    parser.add_argument(
        'timezone', help='Time zone to set; see "timedatectl list-timezones".')
    return parser.parse_args()


def _set_timezone(arguments):
    """Set time zone with timedatectl."""
    try:
        command = ['timedatectl', 'set-timezone', arguments.timezone]
        subprocess.run(command, stdout=subprocess.DEVNULL, check=True)
    except subprocess.CalledProcessError as exception:
        print('Error setting timezone:', exception, file=sys.stderr)
        sys.exit(1)


def main():
    """Parse arguments and perform all duties."""
    arguments = parse_arguments()
    _set_timezone(arguments)


if __name__ == '__main__':
    main()