# SPDX-License-Identifier: AGPL-3.0-or-later
"""
FreedomBox app for radicale.
"""

import logging

import augeas
from django.utils.translation import ugettext_lazy as _

from plinth import actions
from plinth import app as app_module
from plinth import cfg, frontpage, menu
from plinth.modules.apache.components import Uwsgi, Webserver
from plinth.modules.backups.components import BackupRestore
from plinth.modules.firewall.components import Firewall
from plinth.modules.users.components import UsersAndGroups
from plinth.utils import Version, format_lazy

from . import manifest

version = 2

managed_packages = ['radicale']

_description = [
    format_lazy(
        _('Radicale is a CalDAV and CardDAV server. It allows synchronization '
          'and sharing of scheduling and contact data. To use Radicale, a '
          '<a href="https://radicale.org/master.html#documentation/supported-'
          'clients">supported client application</a> is needed. Radicale can '
          'be accessed by any user with a {box_name} login.'),
        box_name=_(cfg.box_name)),
    _('Radicale provides a basic web interface, which only supports creating '
      'new calendars and addressbooks. It does not support adding events or '
      'contacts, which must be done using a separate client.'),
]

logger = logging.getLogger(__name__)

CONFIG_FILE = '/etc/radicale/config'

app = None


class RadicaleApp(app_module.App):
    """FreedomBox app for Radicale."""

    app_id = 'radicale'

    def __init__(self):
        """Create components for the app."""
        super().__init__()
        info = app_module.Info(app_id=self.app_id, version=version,
                               name=_('Radicale'), icon_filename='radicale',
                               short_description=_('Calendar and Addressbook'),
                               description=_description,
                               manual_page='Radicale',
                               clients=manifest.clients)
        self.add(info)

        menu_item = menu.Menu('menu-radicale', info.name,
                              info.short_description, info.icon_filename,
                              'radicale:index', parent_url_name='apps')
        self.add(menu_item)

        shortcut = frontpage.Shortcut('shortcut-radicale', info.name,
                                      short_description=info.short_description,
                                      icon=info.icon_filename,
                                      url='/radicale/', clients=info.clients,
                                      login_required=True)
        self.add(shortcut)

        firewall = Firewall('firewall-radicale', info.name,
                            ports=['http', 'https'], is_external=True)
        self.add(firewall)

        webserver = Webserver('webserver-radicale', 'radicale2-freedombox',
                              urls=['https://{host}/radicale'])
        self.add(webserver)

        uwsgi = Uwsgi('uwsgi-radicale', 'radicale')
        self.add(uwsgi)

        users_and_groups = UsersAndGroups('users-and-groups-radicale',
                                          reserved_usernames=['radicale'])
        self.add(users_and_groups)

        backup_restore = BackupRestore('backup-restore-radicale',
                                       **manifest.backup)
        self.add(backup_restore)

    def enable(self):
        """Fix missing directories before enabling radicale."""
        actions.superuser_run('radicale', ['fix-paths'])
        super().enable()


def setup(helper, old_version=None):
    """Install and configure the module."""
    helper.install(managed_packages)
    helper.call('post', app.enable)


def force_upgrade(helper, packages):
    """Force upgrade radicale to resolve conffile prompt."""
    if 'radicale' not in packages:
        return False

    # Allow upgrade from 2.* to newer 2.* and 3.*
    package = packages['radicale']
    if Version(package['new_version']) > Version('4~'):
        return False

    rights = get_rights_value()
    helper.install(['radicale'], force_configuration='new')
    actions.superuser_run('radicale', ['configure', '--rights_type', rights])

    return True


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

    # 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 get_rights_value():
    """Returns the current Rights value."""
    aug = load_augeas()
    value = aug.get('/files' + CONFIG_FILE + '/rights/type')

    if value == 'from_file':
        # Default rights file is equivalent to owner_only.
        value = 'owner_only'

    return value