#!/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 Plinth firewall inteface
"""

import argparse
import subprocess


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

    # Get status
    subparsers.add_parser('get-status',
                          help='Get whether firewalld is running')

    # Get service status
    get_enabled_services = subparsers.add_parser(
        'get-enabled-services', help='Get list of enabled services')
    get_enabled_services.add_argument(
        '--zone', help='Zone from which the list is to be retrieved',
        required=True)

    # Add a service
    add_service = subparsers.add_parser('add-service', help='Add a service')
    add_service.add_argument('service', help='Name of the service to add')
    add_service.add_argument('--zone',
                             help='Zone to which service is to be added',
                             required=True)

    # Remove a service status
    remove_service = subparsers.add_parser('remove-service',
                                           help='Remove a service')
    remove_service.add_argument('service',
                                help='Name of the service to remove')
    remove_service.add_argument(
        '--zone', help='Zone from which service is to be removed',
        required=True)

    return parser.parse_args()


def subcommand_get_status(_):
    """Print status of the firewalld service"""
    subprocess.call(['firewall-cmd', '--state'])


def subcommand_get_enabled_services(arguments):
    """Print the status of variours services"""
    subprocess.call(['firewall-cmd', '--zone', arguments.zone,
                     '--list-services'])


def subcommand_add_service(arguments):
    """Permit a service in the firewall"""
    subprocess.call(['firewall-cmd', '--zone', arguments.zone, '--add-service',
                     arguments.service])
    subprocess.call(['firewall-cmd', '--zone', arguments.zone, '--permanent',
                     '--add-service', arguments.service])


def subcommand_remove_service(arguments):
    """Block a service in the firewall"""
    subprocess.call(['firewall-cmd', '--zone', arguments.zone,
                     '--remove-service', arguments.service])
    subprocess.call(['firewall-cmd', '--zone', arguments.zone, '--permanent',
                     '--remove-service', arguments.service])


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()
