# SPDX-License-Identifier: AGPL-3.0-or-later
"""
FreedomBox app for calibre e-book library.
"""

import json
import re

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.daemon import Daemon
from plinth.modules.apache.components import Webserver
from plinth.modules.firewall.components import Firewall
from plinth.modules.users.components import UsersAndGroups
from plinth.utils import format_lazy

from .manifest import backup, clients  # noqa, pylint: disable=unused-import

version = 1

managed_services = ['calibre-server-freedombox']

managed_packages = ['calibre']

_description = [
    format_lazy(
        _('calibre server provides online access to your e-book collection. '
          'You can store your e-books on your {box_name}, read them online or '
          'from any of your devices.'), box_name=_(cfg.box_name)),
    _('You can organize your e-books, extract and edit their metadata, and '
      'perform advanced search. calibre can import, export, or convert across '
      'a wide range of formats to make e-books ready for reading on any '
      'device. It also provides an online web reader. It remembers your '
      'last read location, bookmarks, and highlighted text. Content '
      'distribution using OPDS is currently not supported.'),
    _('Only users belonging to <em>calibre</em> group will be able to access '
      'the app. All users with access can use all the libraries.')
]

app = None

LIBRARY_NAME_PATTERN = r'[a-zA-Z0-9 _-]+'


class CalibreApp(app_module.App):
    """FreedomBox app for calibre."""

    app_id = 'calibre'

    def __init__(self):
        """Create components for the app."""
        super().__init__()

        groups = {'calibre': _('Use calibre e-book libraries')}

        info = app_module.Info(app_id=self.app_id, version=version,
                               name=_('calibre'), icon_filename='calibre',
                               short_description=_('E-book Library'),
                               description=_description, manual_page='Calibre',
                               clients=clients,
                               donation_url='https://calibre-ebook.com/donate')
        self.add(info)

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

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

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

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

        daemon = Daemon('daemon-calibre', managed_services[0],
                        listen_ports=[(8844, 'tcp4')])
        self.add(daemon)

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


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


def validate_library_name(library_name):
    """Raise exception if library name does not fit the accepted pattern."""
    if not re.fullmatch(r'[A-Za-z0-9_.-]+', library_name):
        raise Exception('Invalid library name')


def list_libraries():
    """Return a list of libraries."""
    output = actions.superuser_run('calibre', ['list-libraries'])
    return json.loads(output)['libraries']


def create_library(name):
    """Create an empty library."""
    actions.superuser_run('calibre', ['create-library', name])
    actions.superuser_run('service', ['try-restart', managed_services[0]])


def delete_library(name):
    """Delete a library and its contents."""
    actions.superuser_run('calibre', ['delete-library', name])
    actions.superuser_run('service', ['try-restart', managed_services[0]])