#!/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/>.
#

"""
Configure Mumble server.
"""

import argparse
import sys
from subprocess import Popen, PIPE


def parse_arguments():
    """Return parsed command line arguments as dictionary."""

    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')

    subparsers.add_parser('create-password',
                          help='Setup mumble superuser password')

    return parser.parse_args()


def read_from_stdin():
    """Read password from stdin"""

    return (''.join(sys.stdin)).strip()


def subcommand_create_password(arguments):
    """Save superuser password with murmurd command"""

    password = read_from_stdin()

    cmd = ['murmurd', '-ini', '/etc/mumble-server.ini', '-readsupw']
    proc = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE, shell=False)

    # The exit code of the command above seems to be 1 when successful!
    # checking if the 'phrase' is included in the error message which
    # shows that the password is successfully set.
    out, err = proc.communicate(input=password.encode())
    out, err = out.decode(), err.decode()

    phrase = "Superuser password set on server"
    if phrase not in err:
        print(
            "Error occured while saving password: %s" % err
        )
        sys.exit(1)


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

    subcommand = arguments.subcommand.replace('-', '_')
    subcommand_method = globals()['subcommand_' + subcommand]
    subcommand_method(arguments)


if __name__ == '__main__':
    main()