# SPDX-License-Identifier: AGPL-3.0-or-later
"""
FreedomBox app to configure Searx.
"""

import os

from django.utils.translation import ugettext_lazy as _

from plinth import actions
from plinth import app as app_module
from plinth import frontpage, menu
from plinth.modules.apache.components import Uwsgi, Webserver
from plinth.modules.firewall.components import Firewall
from plinth.modules.users.components import UsersAndGroups

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

version = 4

managed_packages = ['searx', 'uwsgi', 'uwsgi-plugin-python3']

_description = [
    _('Searx is a privacy-respecting Internet metasearch engine. '
      'It aggregrates and displays results from multiple search engines.'),
    _('Searx can be used to avoid tracking and profiling by search engines. '
      'It stores no cookies by default.')
]

manual_page = 'Searx'

app = None


class SearxApp(app_module.App):
    """FreedomBox app for Searx."""

    app_id = 'searx'

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

        groups = {'web-search': _('Search the web')}

        info = app_module.Info(app_id=self.app_id, version=version,
                               name=_('Searx'), icon_filename='searx',
                               short_description=_('Web Search'),
                               description=_description, manual_page='Searx',
                               clients=clients)
        self.add(info)

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

        shortcut = frontpage.Shortcut(
            'shortcut-searx', info.name,
            short_description=info.short_description, icon=info.icon_filename,
            url='/searx/', clients=info.clients,
            login_required=(not is_public_access_enabled()),
            allowed_groups=list(groups))
        self.add(shortcut)

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

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

        webserver = SearxWebserverAuth('webserver-searx-auth',
                                       'searx-freedombox-auth')
        self.add(webserver)

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

        users_and_groups = UsersAndGroups('users-and-groups-searx',
                                          groups=groups)
        self.add(users_and_groups)

    def set_shortcut_login_required(self, login_required):
        """Change the login_required property of shortcut."""
        shortcut = self.remove('shortcut-searx')
        shortcut.login_required = login_required
        self.add(shortcut)


class SearxWebserverAuth(Webserver):
    """Component to handle Searx authentication webserver configuration."""

    def is_enabled(self):
        """Return if configuration is enabled or public access is enabled."""
        return is_public_access_enabled() or super().is_enabled()

    def enable(self):
        """Enable apache configuration only if public access is disabled."""
        if not is_public_access_enabled():
            super().enable()


def init():
    """Initialize the module."""
    global app
    app = SearxApp()

    setup_helper = globals()['setup_helper']
    if setup_helper.get_state() != 'needs-setup' and app.is_enabled():
        app.set_enabled(True)


def setup(helper, old_version=None):
    """Install and configure the module."""
    helper.install(managed_packages)
    helper.call('post', actions.superuser_run, 'searx', ['setup'])
    if not old_version or old_version < 3:
        helper.call('post', actions.superuser_run, 'searx',
                    ['disable-public-access'])
        helper.call('post', app.enable)
        app.set_shortcut_login_required(True)


def get_safe_search_setting():
    """Get the current value of the safe search setting for Searx."""
    value = actions.superuser_run('searx', ['get-safe-search'])
    return int(value.strip())


def is_public_access_enabled():
    """Check whether public access is enabled for Searx."""
    return os.path.exists(PUBLIC_ACCESS_SETTING_FILE)


def enable_public_access():
    """Allow Searx app to be accessed by anyone with access."""
    actions.superuser_run('searx', ['enable-public-access'])
    app.get_component('webserver-searx-auth').disable()
    app.set_shortcut_login_required(False)


def disable_public_access():
    """Allow Searx app to be accessed by logged-in users only."""
    actions.superuser_run('searx', ['disable-public-access'])
    app.get_component('webserver-searx-auth').enable()
    app.set_shortcut_login_required(True)
