## Copyright (C) 2012-2013  Daniel Pavel
## Copyright (C) 2014-2024  Solaar Contributors https://pwr-solaar.github.io/Solaar/
##
## This program 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; either version 2 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 General Public License for more details.
##
## You should have received a copy of the GNU General Public License along
## with this program; if not, write to the Free Software Foundation, Inc.,
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
from __future__ import annotations

import logging

from typing import Callable

logger = logging.getLogger(__name__)

try:
    import dbus

    from dbus.mainloop.glib import DBusGMainLoop  # integration into the main GLib loop

    DBusGMainLoop(set_as_default=True)
    bus = dbus.SystemBus()
    assert bus

except Exception:
    # Either the dbus library is not available or the system dbus is not running
    logger.warning("failed to set up dbus")
    bus = None


_suspend_callback = None
_resume_callback = None


def _suspend_or_resume(suspend):
    if suspend and _suspend_callback:
        _suspend_callback()
    if not suspend and _resume_callback:
        _resume_callback()


_LOGIND_PATH = "/org/freedesktop/login1"
_LOGIND_INTERFACE = "org.freedesktop.login1.Manager"


def watch_suspend_resume(
    on_resume_callback: Callable[[], None] | None = None,
    on_suspend_callback: Callable[[], None] | None = None,
):
    """Register callback for suspend/resume events.
    They are called only if the system DBus is running, and the Login daemon is available."""
    global _resume_callback, _suspend_callback
    _suspend_callback = on_suspend_callback
    _resume_callback = on_resume_callback
    if bus is not None and on_resume_callback is not None or on_suspend_callback is not None:
        bus.add_signal_receiver(
            _suspend_or_resume,
            "PrepareForSleep",
            dbus_interface=_LOGIND_INTERFACE,
            path=_LOGIND_PATH,
        )
    logger.info("connected to system dbus, watching for suspend/resume events")


_BLUETOOTH_PATH_PREFIX = "/org/bluez/hci0/dev_"
_BLUETOOTH_INTERFACE = "org.freedesktop.DBus.Properties"

_bluetooth_callbacks = {}


def watch_bluez_connect(serial, callback=None):
    if _bluetooth_callbacks.get(serial):
        _bluetooth_callbacks.get(serial).remove()
    path = _BLUETOOTH_PATH_PREFIX + serial.replace(":", "_").upper()
    if bus is not None and callback is not None:
        _bluetooth_callbacks[serial] = bus.add_signal_receiver(
            callback, "PropertiesChanged", path=path, dbus_interface=_BLUETOOTH_INTERFACE
        )