#!/usr/bin/python3
# -*- mode: python -*-
#
# This file is part of FreedomBox.
#
# 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 FreedomBox general configuration.
"""

import argparse

import augeas

from plinth import action_utils

APACHE_CONFIGURATION = '/etc/apache2/conf-available/freedombox.conf'


def parse_arguments():
    """Return parsed command line arguments as dictionary."""
    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(dest='subcommand', help='Sub command')
    set_default_app = subparsers.add_parser(
        'set-default-app',
        help='Set the default app for this FreedomBox instance.')
    set_default_app.add_argument('app', help='name of the default app')

    subparsers.required = True
    return parser.parse_args()


def subcommand_set_default_app(arguments):
    """Set the default app for this FreedomBox."""
    app = arguments.app

    aug = augeas.Augeas(flags=augeas.Augeas.NO_LOAD +
                        augeas.Augeas.NO_MODL_AUTOLOAD)
    aug.set('/augeas/load/Httpd/lens', 'Httpd.lns')
    aug.set('/augeas/load/Httpd/incl[last() + 1]', APACHE_CONFIGURATION)
    aug.load()

    aug.defvar('conf', '/files' + APACHE_CONFIGURATION)

    for match in aug.match('/files' + APACHE_CONFIGURATION +
                           '/directive["RedirectMatch"]'):
        if aug.get(match + "/arg[1]") == '''"^/$"''':
            aug.set(match + "/arg[2]", '"/{}/"'.format(app))

    aug.save()

    action_utils.service_reload('apache2')


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()