#
# 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/>.
#
"""
FreedomBox app to configure ejabberd server.
"""

import logging

from django.urls import reverse_lazy
from django.utils.translation import ugettext_lazy as _

from plinth import action_utils, actions
from plinth import app as app_module
from plinth import cfg, frontpage, menu
from plinth.daemon import Daemon
from plinth.modules import config
from plinth.modules.apache.components import Webserver
from plinth.modules.firewall.components import Firewall
from plinth.signals import (domainname_change, post_hostname_change,
                            pre_hostname_change)
from plinth.utils import format_lazy

from .manifest import backup, clients

version = 3

managed_services = ['ejabberd']

managed_packages = ['ejabberd']

name = _('ejabberd')

short_description = _('Chat Server')

description = [
    _('XMPP is an open and standardized communication protocol. Here '
      'you can run and configure your XMPP server, called ejabberd.'),
    format_lazy(
        _('To actually communicate, you can use the <a href="{jsxc_url}">'
          'web client</a> or any other <a href=\'https://xmpp.org/'
          'software/clients\' target=\'_blank\'>XMPP client</a>. '
          'When enabled, ejabberd can be accessed by any '
          '<a href="{users_url}"> user with a {box_name} login</a>.'),
        box_name=_(cfg.box_name), users_url=reverse_lazy('users:index'),
        jsxc_url=reverse_lazy('jsxc:index'))
]

clients = clients

reserved_usernames = ['ejabberd']

manual_page = 'ejabberd'

port_forwarding_info = [
    ('TCP', 5222),
    ('TCP', 5269),
    ('TCP', 5280),
]

logger = logging.getLogger(__name__)

app = None


class EjabberdApp(app_module.App):
    """FreedomBox app for ejabberd."""

    app_id = 'ejabberd'

    def __init__(self):
        """Create components for the app."""
        super().__init__()
        menu_item = menu.Menu('menu-ejabberd', name, short_description,
                              'ejabberd', 'ejabberd:index',
                              parent_url_name='apps')
        self.add(menu_item)

        shortcut = frontpage.Shortcut(
            'shortcut-ejabberd', name, short_description=short_description,
            icon='ejabberd', description=description,
            configure_url=reverse_lazy('ejabberd:index'), clients=clients,
            login_required=True)
        self.add(shortcut)

        firewall = Firewall('firewall-ejabberd', name,
                            ports=['xmpp-client', 'xmpp-server',
                                   'xmpp-bosh'], is_external=True)
        self.add(firewall)

        webserver = Webserver('webserver-ejabberd', 'jwchat-plinth')
        self.add(webserver)

        daemon = Daemon('daemon-ejabberd', managed_services[0])
        self.add(daemon)


def init():
    """Initialize the ejabberd module"""
    global app
    app = EjabberdApp()

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

    pre_hostname_change.connect(on_pre_hostname_change)
    post_hostname_change.connect(on_post_hostname_change)
    domainname_change.connect(on_domainname_change)


def setup(helper, old_version=None):
    """Install and configure the module."""
    domainname = config.get_domainname()
    logger.info('ejabberd service domainname - %s', domainname)

    helper.call('pre', actions.superuser_run, 'ejabberd',
                ['pre-install', '--domainname', domainname])
    helper.install(managed_packages)
    helper.call('post', actions.superuser_run, 'ejabberd', ['setup'])
    helper.call('post', app.enable)


def on_pre_hostname_change(sender, old_hostname, new_hostname, **kwargs):
    """
    Backup ejabberd database before hostname is changed.
    """
    del sender  # Unused
    del kwargs  # Unused

    actions.superuser_run('ejabberd', [
        'pre-change-hostname', '--old-hostname', old_hostname,
        '--new-hostname', new_hostname
    ])


def on_post_hostname_change(sender, old_hostname, new_hostname, **kwargs):
    """Update ejabberd config after hostname change."""
    del sender  # Unused
    del kwargs  # Unused

    actions.superuser_run('ejabberd', [
        'change-hostname', '--old-hostname', old_hostname, '--new-hostname',
        new_hostname
    ], run_in_background=True)


def on_domainname_change(sender, old_domainname, new_domainname, **kwargs):
    """Update ejabberd config after domain name change."""
    del sender  # Unused
    del old_domainname  # Unused
    del kwargs  # Unused

    actions.superuser_run(
        'ejabberd', ['change-domainname', '--domainname', new_domainname],
        run_in_background=True)


def diagnose():
    """Run diagnostics and return the results."""
    results = []

    results.append(action_utils.diagnose_port_listening(5222, 'tcp4'))
    results.append(action_utils.diagnose_port_listening(5222, 'tcp6'))
    results.append(action_utils.diagnose_port_listening(5269, 'tcp4'))
    results.append(action_utils.diagnose_port_listening(5269, 'tcp6'))
    results.append(action_utils.diagnose_port_listening(5443, 'tcp4'))
    results.append(action_utils.diagnose_port_listening(5443, 'tcp6'))
    results.extend(action_utils.diagnose_url_on_all('http://{host}/bosh/'))

    return results