#!/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 Privoxy server.
"""

import argparse
import re

from plinth import action_utils


CONFIG_FILE = '/etc/privoxy/config'


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('setup',
                          help='Perform Privoxy configuration setup')
    subparsers.add_parser('enable', help='Enable Privoxy service')
    subparsers.add_parser('disable', help='Disable Privoxy service')

    return parser.parse_args()


def subcommand_setup(_):
    """Setup configuration for the first time."""
    with open(CONFIG_FILE, 'r') as conffile:
        lines = conffile.readlines()

    with open(CONFIG_FILE, 'w') as conffile:
        written = False
        for line in lines:
            if re.match(r'#?listen-address', line) and not written:
                conffile.write('listen-address [::]:8118\n')
                written = True
            else:
                conffile.write(line)

        if not written:
            conffile.write('listen-address [::]:8118')

    action_utils.service_restart('privoxy')


def subcommand_enable(_):
    """Start service."""
    action_utils.service_enable('privoxy')


def subcommand_disable(_):
    """Stop service."""
    action_utils.service_disable('privoxy')


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()
