#!/usr/bin/python3
#
# 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 Radicale.
"""

import argparse
import augeas

from plinth import action_utils

CONFIG_FILE = '/etc/radicale/config'
DEFAULT_FILE = '/etc/default/radicale'


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='Setup Radicale configuration')
    subparsers.add_parser('enable', help='Enable Radicale service')
    subparsers.add_parser('disable', help='Disable Radicale service')
    configure = subparsers.add_parser('configure',
                                      help='Configure various options')
    configure.add_argument('--rights_type',
                           help='Set the rights type for radicale')

    return parser.parse_args()


def subcommand_setup(_):
    """Setup Radicale configuration."""
    aug = load_augeas()

    aug.set('/files' + DEFAULT_FILE + '/ENABLE_RADICALE', 'yes')

    aug.set('/files' + CONFIG_FILE + '/server/hosts',
            '127.0.0.1:5232, [::1]:5232')
    aug.set('/files' + CONFIG_FILE + '/server/base_prefix', '/radicale/')
    aug.set('/files' + CONFIG_FILE + '/well-known/caldav',
            '/radicale/%(user)s/caldav/')
    aug.set('/files' + CONFIG_FILE + '/well-known/carddav',
            '/radicale/%(user)s/carddav/')
    aug.set('/files' + CONFIG_FILE + '/auth/type', 'remote_user')
    aug.set('/files' + CONFIG_FILE + '/rights/type', 'owner_only')

    aug.save()

    action_utils.service_restart('radicale')
    action_utils.webserver_enable('radicale-plinth')


def subcommand_configure(arguments):
    """Sets the radicale rights type to a particular value"""
    aug = load_augeas()
    aug.set('/files' + CONFIG_FILE + '/rights/type', arguments.rights_type)
    aug.save()

    action_utils.service_restart('radicale')


def subcommand_enable(_):
    """Start service."""
    action_utils.service_enable('radicale')
    action_utils.webserver_enable('radicale-plinth')


def subcommand_disable(_):
    """Stop service."""
    action_utils.webserver_disable('radicale-plinth')
    action_utils.service_disable('radicale')


def load_augeas():
    """Initialize Augeas."""
    aug = augeas.Augeas(flags=augeas.Augeas.NO_LOAD +
                        augeas.Augeas.NO_MODL_AUTOLOAD)

    # shell-script config file lens
    aug.set('/augeas/load/Shellvars/lens', 'Shellvars.lns')
    aug.set('/augeas/load/Shellvars/incl[last() + 1]', DEFAULT_FILE)

    # INI file lens
    aug.set('/augeas/load/Puppet/lens', 'Puppet.lns')
    aug.set('/augeas/load/Puppet/incl[last() + 1]', CONFIG_FILE)

    aug.load()
    return aug


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()