/*  QWinFF - a qt4 gui frontend for ffmpeg
 *  Copyright (C) 2011-2013 Timothy Lin <lzh9102@gmail.com>
 *
 *  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 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/* Windows32 Implementation of PowerManagement class */

#include "powermanagement.h"
#include <windows.h>
#include <powrprof.h>

namespace
{

bool adjustPrivilegeForShutdown()
{
    HANDLE hCurrentProc = GetCurrentProcess();
    HANDLE hToken;
    LUID tmpLuid;
    TOKEN_PRIVILEGES tkp;
    LUID_AND_ATTRIBUTES luidAttr;

    if (!OpenProcessToken(hCurrentProc
                     , TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY
                     , &hToken))
        return false;

    if (!LookupPrivilegeValueA("", "SeShutdownPrivilege", &tmpLuid))
        return false;

    luidAttr.Luid = tmpLuid;
    luidAttr.Attributes = SE_PRIVILEGE_ENABLED;
    tkp.PrivilegeCount = 1;
    tkp.Privileges[0] = luidAttr;

    if (!AdjustTokenPrivileges(hToken, false, &tkp
                               , sizeof(TOKEN_PRIVILEGES), 0, 0))
        return false;

    return true;
}

bool power_suspend()
{
    /*
        BOOLEAN WINAPI SetSuspendState(
          __in  BOOLEAN Hibernate,
          __in  BOOLEAN ForceCritical,
          __in  BOOLEAN DisableWakeEvent
        );
    */
    bool hal_works = SetSuspendState(false, true, false);
    return hal_works;
}

bool power_hibernate()
{
    /* SetSuspendState: see power_suspend() */
    bool hal_works = SetSuspendState(true, true, false);
    return hal_works;
}

bool power_shutdown()
{
    bool shutdown_works = false;

    if (!adjustPrivilegeForShutdown())
        return false;

    shutdown_works = ExitWindowsEx(EWX_SHUTDOWN | EWX_FORCE | EWX_POWEROFF, 0);

    return shutdown_works;
}

} // anonymous namespace

bool PowerManagement::sendRequest(int action)
{
    switch (action) {
    case SHUTDOWN:
        return power_shutdown();
    case SUSPEND:
        return power_suspend();
    case HIBERNATE:
        return power_hibernate();
    }
    return false;
}

bool PowerManagement::implemented()
{
    return true;
}