#!/usr/bin/python3
# -*- mode: python -*-
#
# This file is part of Plinth.
#
# 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/>.
#

"""
Configuration helper for BIND server.
"""

import argparse

from plinth import action_utils


CONFIG_FILE = '/etc/bind/named.conf.options'

def parse_arguments():
    """Return parsed command line arguments as dictionary"""
    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')

    configure = subparsers.add_parser('configure', help='Configure Minetest')
    configure.add_argument('--set-forwarding', choices=['true', 'false'],
                           help='Set forwarding true/false')
    configure.add_argument('--dnssec', choices=['true', 'false'],
                           help='Set DNSSEC true/false')

    return parser.parse_args()


def subcommand_configure(arguments):
    """Configure BIND."""

    if arguments.set_forwarding:
        set_forwarding(arguments.set_forwarding)

    action_utils.service_restart('bind9')


def set_forwarding(choice):
    actions.superuser_run('bind', ['setup'])
    if choice == False:
        flag = 0
        data = [line.strip() for line in open(CONFIG_FILE, 'r')]
        if 'forwarders {' in data and not '// forwarders {' in data:
            f = open(CONFIG_FILE, 'w')
            for line in data:
                if 'forwarders {' in line and not '// forwarders {' in line:
                   flag = 1
                if flag == 1:
                   line = '	//'+line
                if 'forward only' in line:
                    flag = 0
                f.write(line+'\n')
            f.close()



    if choice == True:
        flag = 0
        data = [line.strip() for line in open(CONFIG_FILE, 'r')]
        if '// forwarders {' in data:
            f = open(CONFIG_FILE, 'w')
            for line in data:
                if '// forwarders {' in line:
                   flag = 1
                if flag == 1:
                   line = line[2:]
                if 'forward only' in line:
                    flag = 0
                f.write(line+'\n')
            f.close()


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()