#!/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


SITE_CONF = '/etc/apache2/conf-available/deluge-web.conf'
SITE_ENABLED = '/etc/apache2/conf-enabled/deluge-web.conf'


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

    # Get whether deluge-web site is enabled
    subparsers.add_parser('get-enabled',
                          help='Get whether deluge-web site is enabled')

    # Enable deluge-web site and start deluge-web
    subparsers.add_parser('enable', help='Enable deluge-web site')

    # Disable deluge-web site and stop deluge-web
    subparsers.add_parser('disable', help='Disable deluge-web site')

    # Get whether deluge-web is running
    subparsers.add_parser('is-running',
                          help='Get whether deluge-web is running')

    # Start deluge-web
    subparsers.add_parser('start', help='Start deluge-web')

    # Stop deluge-web
    subparsers.add_parser('stop', help='Stop deluge-web')

    return parser.parse_args()


def subcommand_get_enabled(_):
    """Get whether deluge-web site is enabled."""
    if os.path.isfile(SITE_ENABLED):
        print('yes')
    else:
        print('no')


def subcommand_enable(_):
    """Enable deluge-web site and start deluge-web."""
    if not os.path.isfile(SITE_CONF):
        setup()
    subprocess.check_call(['a2enconf', 'deluge-web'])
    subprocess.check_call(['service', 'apache2', 'reload'])

    subcommand_start(_)


def subcommand_disable(_):
    """Disable deluge-web site and stop deluge-web."""
    subprocess.check_call(['a2disconf', 'deluge-web'])
    subprocess.check_call(['service', 'apache2', 'reload'])

    subcommand_stop(_)


def subcommand_is_running(_):
    """Get whether deluge-web is running."""
    if subprocess.call(['pgrep', 'deluge-web']) == 0:
        print('yes')
    else:
        print('no')


def subcommand_start(_):
    """Start deluge-web."""
    subprocess.check_call(['start-stop-daemon', '--start', '--background',
                           '--name', 'deluge-web',
                           '--exec', '/usr/bin/deluge-web',
                           '--chuid', 'debian-deluged',
                           '--', '--base=bittorrent'])


def subcommand_stop(_):
    """Stop deluge-web."""
    subprocess.call(['killall', 'deluge-web'])


def setup():
    """Perform initial setup for deluge-web site."""
    with open(SITE_CONF, 'w') as conffile:
        conffile.writelines([
            '<Location /bittorrent>\n',
            '    ProxyPass http://localhost:8112\n',
            '</Location>\n',
        ])


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()