#!/usr/bin/python -OO
# Copyright 2008-2017 The SABnzbd-Team <team@sabnzbd.org>
#
# 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.

"""
sabnzbd.powersup - System power management support
"""

import os
import subprocess
import logging
import time


##############################################################################
# Power management for Windows
##############################################################################
try:
    import win32security
    import win32api
    import ntsecuritycon
except ImportError:
    pass


def win_power_privileges():
    """ To do any power-options, the process needs higher privileges """
    flags = ntsecuritycon.TOKEN_ADJUST_PRIVILEGES | ntsecuritycon.TOKEN_QUERY
    htoken = win32security.OpenProcessToken(win32api.GetCurrentProcess(), flags)
    id_ = win32security.LookupPrivilegeValue(None, ntsecuritycon.SE_SHUTDOWN_NAME)
    newPrivileges = [(id_, ntsecuritycon.SE_PRIVILEGE_ENABLED)]
    win32security.AdjustTokenPrivileges(htoken, 0, newPrivileges)


def win_hibernate():
    """ Hibernate Windows system, returns after wakeup """
    try:
        win_power_privileges()
        win32api.SetSystemPowerState(False, True)
    except:
        logging.error(T('Failed to hibernate system'))
        logging.info("Traceback: ", exc_info=True)


def win_standby():
    """ Standby Windows system, returns after wakeup """
    try:
        win_power_privileges()
        win32api.SetSystemPowerState(True, True)
    except:
        logging.error(T('Failed to standby system'))
        logging.info("Traceback: ", exc_info=True)


def win_shutdown():
    """ Shutdown Windows system, never returns """
    try:
        win_power_privileges()
        win32api.InitiateSystemShutdown("", "", 30, 1, 0)
    finally:
        os._exit(0)


##############################################################################
# Power management for OSX
##############################################################################

def osx_shutdown():
    """ Shutdown OSX system, never returns """
    try:
        subprocess.call(['osascript', '-e', 'tell app "System Events" to shut down'])
    except:
        logging.error(T('Error while shutting down system'))
        logging.info("Traceback: ", exc_info=True)
    os._exit(0)


def osx_standby():
    """ Make OSX system sleep, returns after wakeup """
    try:
        subprocess.call(['osascript', '-e', 'tell app "System Events" to sleep'])
        time.sleep(10)
    except:
        logging.error(T('Failed to standby system'))
        logging.info("Traceback: ", exc_info=True)


def osx_hibernate():
    """ Make OSX system sleep, returns after wakeup """
    osx_standby()


##############################################################################
# Power management for Linux
##############################################################################

#    Requires DBus plus either HAL [1] or the more modern ConsoleKit [2] and
#    DeviceKit(-power) [3]. HAL will eventually be deprecated but older systems
#    might still use it.
#    [1] http://people.freedesktop.org/~hughsient/temp/dbus-interface.html
#    [2] http://www.freedesktop.org/software/ConsoleKit/doc/ConsoleKit.html
#    [3] http://hal.freedesktop.org/docs/DeviceKit-power/
#
#    Original code was contributed by Marcel de Vries <marceldevries@phannet.cc>
#

try:
    import dbus
    HAVE_DBUS = True
except ImportError:
    HAVE_DBUS = False


_IS_NOT_INTERACTIVE = False
_LOGIND_SUCCESSFUL_RESULT = 'yes'


def _get_sessionproxy():
    """ Return (proxy-object, interface), (None, None) if not available """
    name = 'org.freedesktop.PowerManagement'
    path = '/org/freedesktop/PowerManagement'
    interface = 'org.freedesktop.PowerManagement'
    try:
        bus = dbus.SessionBus()
        return bus.get_object(name, path), interface
    except dbus.exceptions.DBusException:
        return None, None


def _get_systemproxy(method):
    """ Return (proxy-object, interface, pinterface), (None, None, None) if not available """
    if method == 'ConsoleKit':
        name = 'org.freedesktop.ConsoleKit'
        path = '/org/freedesktop/ConsoleKit/Manager'
        interface = 'org.freedesktop.ConsoleKit.Manager'
        pinterface = None
    elif method == 'DeviceKit':
        name = 'org.freedesktop.DeviceKit.Power'
        path = '/org/freedesktop/DeviceKit/Power'
        interface = 'org.freedesktop.DeviceKit.Power'
        pinterface = 'org.freedesktop.DBus.Properties'
    elif method == 'UPower':
        name = 'org.freedesktop.UPower'
        path = '/org/freedesktop/UPower'
        interface = 'org.freedesktop.UPower'
        pinterface = 'org.freedesktop.DBus.Properties'
    elif method == 'Logind':
        name = 'org.freedesktop.login1'
        path = '/org/freedesktop/login1'
        interface = 'org.freedesktop.login1.Manager'
        pinterface = None
    try:
        bus = dbus.SystemBus()
        return bus.get_object(name, path), interface, pinterface
    except dbus.exceptions.DBusException, msg:
        logging.info('DBus not reachable (%s)', msg)
        return None, None, None


def linux_shutdown():
    """ Make Linux system shutdown, never returns """
    if not HAVE_DBUS:
        os._exit(0)

    try:
        proxy, interface = _get_sessionproxy()

        if proxy:
            if proxy.CanShutdown():
                proxy.Shutdown(dbus_interface=interface)
        else:
            proxy, interface, pinterface = _get_systemproxy('Logind')
            if proxy:
                if proxy.CanPowerOff(dbus_interface=interface) == _LOGIND_SUCCESSFUL_RESULT:
                    proxy.PowerOff(_IS_NOT_INTERACTIVE, dbus_interface=interface)
            else:
                proxy, interface, _pinterface = _get_systemproxy('ConsoleKit')
                if proxy:
                    if proxy.CanStop(dbus_interface=interface):
                        proxy.Stop(dbus_interface=interface)
                else:
                    logging.info('DBus does not support Stop (shutdown)')
    except dbus.exceptions.DBusException, msg:
        logging.error('Received a DBus exception %s', msg)
    os._exit(0)


def linux_hibernate():
    """ Make Linux system go into hibernate, returns after wakeup """
    if not HAVE_DBUS:
        return

    try:
        proxy, interface = _get_sessionproxy()
        if proxy:
            if proxy.CanHibernate():
                proxy.Hibernate(dbus_interface=interface)
        else:
            proxy, interface, pinterface = _get_systemproxy('Logind')
            if proxy:
                if proxy.CanHibernate(dbus_interface=interface) == _LOGIND_SUCCESSFUL_RESULT:
                    proxy.Hibernate(_IS_NOT_INTERACTIVE, dbus_interface=interface)
            else:
                proxy, interface, pinterface = _get_systemproxy('UPower')
                if not proxy:
                    proxy, interface, pinterface = _get_systemproxy('DeviceKit')
                if proxy:
                    if proxy.Get(interface, 'can-hibernate', dbus_interface=pinterface):
                        proxy.Hibernate(dbus_interface=interface)
                else:
                    logging.info('DBus does not support Hibernate')
        time.sleep(10)
    except dbus.exceptions.DBusException, msg:
        logging.error('Received a DBus exception %s', msg)


def linux_standby():
    """ Make Linux system go into standby, returns after wakeup """
    if not HAVE_DBUS:
        return

    try:
        proxy, interface = _get_sessionproxy()
        if proxy:
            if proxy.CanSuspend():
                proxy.Suspend(dbus_interface=interface)
        else:
            proxy, interface, pinterface = _get_systemproxy('Logind')
            if proxy:
                if proxy.CanSuspend(dbus_interface=interface) == _LOGIND_SUCCESSFUL_RESULT:
                    proxy.Suspend(_IS_NOT_INTERACTIVE, dbus_interface=interface)
            else:
                proxy, interface, pinterface = _get_systemproxy('UPower')
                if not proxy:
                    proxy, interface, pinterface = _get_systemproxy('DeviceKit')
                if proxy:
                    if proxy.Get(interface, 'can-suspend', dbus_interface=pinterface):
                        proxy.Suspend(dbus_interface=interface)
                else:
                    logging.info('DBus does not support Suspend (standby)')
        time.sleep(10)
    except dbus.exceptions.DBusException, msg:
        logging.error('Received a DBus exception %s', msg)
