# Copyright (C) 2018 André Apitzsch <git AT apitzsch.eu>
#
# This file is part of Gajim.
#
# Gajim is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published
# by the Free Software Foundation; version 3 only.
#
# Gajim 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Gajim. If not, see <http://www.gnu.org/licenses/>.

import logging

from gi.repository import Gio

from gajim.common import app

log = logging.getLogger('gajim.c.dbus.screensaver')


class ScreensaverListener:
    _instance = None

    @classmethod
    def get(cls):
        if cls._instance is None:
            cls._instance = cls()
        return cls._instance

    def __init__(self):
        Gio.bus_watch_name(
            Gio.BusType.SESSION,
            'org.gnome.ScreenSaver',
            Gio.BusNameWatcherFlags.NONE,
            self._appeared,
            None)

    @staticmethod
    def _signal_received(_connection, _sender_name, _object_path,
                         interface_name, _signal_name, parameters, *_user_data):
        '''Signal handler for screensaver active change'''

        log.info('Signal received: %s - %s', interface_name, parameters)

        roster = app.interface.roster

        if not parameters[0]:
            for account in app.connections:
                if app.account_is_connected(account) and \
                        app.sleeper_state[account] == 'autoaway-forced':
                    # We came back online after screensaver
                    # autoaway
                    roster.send_status(account, 'online',
                                       app.status_before_autoaway[account])
                    app.status_before_autoaway[account] = ''
                    app.sleeper_state[account] = 'online'
            return
        if not app.config.get('autoaway'):
            # Don't go auto away if user disabled the option
            return
        for account in app.connections:
            if account not in app.sleeper_state or not app.sleeper_state[account]:
                continue
            if app.sleeper_state[account] == 'online':
                if not app.account_is_connected(account):
                    continue
                # we save our online status
                app.status_before_autoaway[account] = \
                    app.connections[account].status
                # we go away (no auto status) [we pass True to auto param]
                auto_message = app.config.get('autoaway_message')
                if not auto_message:
                    auto_message = app.connections[account].status
                else:
                    auto_message = auto_message.replace('$S', '%(status)s')
                    auto_message = auto_message.replace('$T', '%(time)s')
                    auto_message = auto_message % {
                        'status': app.status_before_autoaway[account],
                        'time': app.config.get('autoxatime')}
                roster.send_status(account, 'away', auto_message, auto=True)
                app.sleeper_state[account] = 'autoaway-forced'

    def _appeared(self, connection, name, _name_owner, *_user_data):
        '''Set up a listener for screensaver signals'''
        log.info('%s appeared', name)
        connection.signal_subscribe(
            'org.gnome.ScreenSaver',
            'org.gnome.ScreenSaver',
            'ActiveChanged',
            '/org/gnome/ScreenSaver',
            None,
            Gio.DBusSignalFlags.NONE,
            self._signal_received,
            None)


def enable():
    ScreensaverListener.get()