#!/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 BitTorrent web client.
"""

import argparse
import os
import subprocess

from plinth import action_utils


SYSTEMD_SERVICE_PATH = '/etc/systemd/system/deluge-web.service'
SYSTEMD_SERVICE = '''
#
# This file is managed and overwritten by Plinth.  If you wish to edit
# it, disable Deluge in Plinth, remove this file and manage it manually.
#
[Unit]
Description=Deluge Web Interface
Documentation=man:deluge-web(1)
After=network.target

[Service]
ExecStart=/usr/bin/deluge-web --base=deluge
Restart=on-failure
User=debian-deluged
Group=debian-deluged

[Install]
WantedBy=multi-user.target
'''


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('enable', help='Enable deluge-web site')
    subparsers.add_parser('disable', help='Disable deluge-web site')

    return parser.parse_args()


def subcommand_enable(_):
    """Enable deluge-web site and start deluge-web."""
    setup()
    action_utils.service_enable('deluge-web')
    action_utils.webserver_enable('deluge-plinth')


def subcommand_disable(_):
    """Disable deluge-web site and stop deluge-web."""
    action_utils.webserver_disable('deluge-plinth')
    action_utils.service_disable('deluge-web')


def setup():
    """Perform initial setup for deluge-web."""
    if not os.path.isfile(SYSTEMD_SERVICE_PATH):
        with open(SYSTEMD_SERVICE_PATH, 'w') as file_handle:
            file_handle.write(SYSTEMD_SERVICE)

        subprocess.check_call(['systemctl', 'daemon-reload'])


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()
