#
# 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/>.
#

"""
Plinth module to configure matrix-synapse server
"""

import logging
import os

from django.urls import reverse_lazy
from django.utils.translation import ugettext_lazy as _
from ruamel.yaml.util import load_yaml_guess_indent

from plinth import action_utils
from plinth import actions
from plinth import cfg
from plinth import frontpage
from plinth import service as service_module
from plinth.modules import names

version = 1

depends = ['apps']

managed_services = ['matrix-synapse']

managed_packages = ['matrix-synapse']

title = _('Federated IM, VoIP and Video server \n (matrix-synapse)')

description = [
    _('Matrix is an new ecosystem for open federated Instant Messaging '
      'and VoIP. Synapse is a reference Matrix server implementation.'),

    _('To communicate, you can use the '
      '<a href=\'https://riot.im/\' target=\'_blank\'>Riot</a> client.'),

    _('Changing the FreedomBox domain name needs a reinstall of '
      'Matrix-Synapse and you WILL LOSE DATA.')
]

service = None

logger = logging.getLogger(__name__)

SERVER_NAME_PATH = "/etc/matrix-synapse/conf.d/server_name.yaml"


def init():
    """Initialize the matrix-synapse module"""
    menu = cfg.main_menu.get('apps:index')
    menu.add_urlname(title, 'glyphicon-comment', 'matrixsynapse:index')

    global service
    setup_helper = globals()['setup_helper']
    if setup_helper.get_state() != 'needs-setup':
        service = service_module.Service(
            'matrix-synapse', title,
            ports=['matrix-synapse'],
            is_external=True, is_enabled=is_enabled, enable=enable,
            disable=disable)
        if is_enabled():
            add_shortcut()


def setup(helper, old_version=None):
    """Install and configure the module."""
    helper.install(managed_packages)
    global service
    if service is None:
        service = service_module.Service(
            'matrix-synapse', title,
            ports=['matrix-synapse-plinth'],
            is_external=True, is_enabled=is_enabled, enable=enable,
            disable=disable)
    helper.call('post', actions.superuser_run, 'matrixsynapse',
                ['post-install'])
    helper.call('post', service.notify_enabled, None, True)
    helper.call('post', add_shortcut)


def add_shortcut():
    frontpage.add_shortcut('matrixsynapse', title, details=description,
                           configure_url=reverse_lazy('matrixsynapse:index'),
                           login_required=True)


def is_setup():
    return os.path.exists(SERVER_NAME_PATH)


def is_enabled():
    """Return whether the module is enabled."""
    return action_utils.service_is_enabled('matrix-synapse')


def get_domain_names():
    """Return the domain name(s)"""
    results = []

    for domain_type, domains in names.domains.items():
        if domain_type == 'hiddenservice':
            continue
        for domain in domains:
            results.append((domain, domain))

    return results


def get_configured_domain_name():
    if not is_setup():
        return ""

    with open(SERVER_NAME_PATH) as config_file:
        config, _, _ = load_yaml_guess_indent(config_file)

    return config["server_name"]


def enable():
    """Enable the module."""
    actions.superuser_run('matrixsynapse', ['enable'])
    add_shortcut()


def disable():
    """Enable the module."""
    actions.superuser_run('matrixsynapse', ['disable'])
    frontpage.remove_shortcut('matrixsynapse')


def diagnose():
    """Run diagnostics and return the results."""
    return [action_utils.diagnose_port_listening(8008, 'tcp4')]