/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 1999, 2000 Matthias Ettrich <ettrich@kde.org>
Copyright (C) 2003 Lubos Lunak <l.lunak@kde.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, see <http://www.gnu.org/licenses/>.
*********************************************************************/

/*

 This file is for (very) small utility functions/classes.

*/

#include "utils.h"

#include <QWidget>
#include <kkeyserver.h>

#ifndef KCMRULES
#include <assert.h>
#include <QApplication>
#include <QDebug>

#include <X11/Xlib.h>

#include <stdio.h>

#include "atoms.h"
#include "platform.h"
#include "workspace.h"

#include <signal.h>

#endif

Q_LOGGING_CATEGORY(KWIN_CORE, "kwin_core", QtCriticalMsg)
namespace KWin
{

#ifndef KCMRULES

//************************************
// StrutRect
//************************************

StrutRect::StrutRect(QRect rect, StrutArea area)
    : QRect(rect)
    , m_area(area)
{
}

StrutRect::StrutRect(const StrutRect& other)
    : QRect(other)
    , m_area(other.area())
{
}

#endif

#ifndef KCMRULES
void updateXTime()
{
    kwinApp()->platform()->updateXTime();
}

static int server_grab_count = 0;

void grabXServer()
{
    if (++server_grab_count == 1)
        xcb_grab_server(connection());
}

void ungrabXServer()
{
    assert(server_grab_count > 0);
    if (--server_grab_count == 0) {
        xcb_ungrab_server(connection());
        xcb_flush(connection());
    }
}

bool grabbedXServer()
{
    return server_grab_count > 0;
}

static bool keyboard_grabbed = false;

bool grabXKeyboard(xcb_window_t w)
{
    if (QWidget::keyboardGrabber() != NULL)
        return false;
    if (keyboard_grabbed)
        return false;
    if (qApp->activePopupWidget() != NULL)
        return false;
    if (w == XCB_WINDOW_NONE)
        w = rootWindow();
    const xcb_grab_keyboard_cookie_t c = xcb_grab_keyboard_unchecked(connection(), false, w, xTime(),
                                                                     XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
    ScopedCPointer<xcb_grab_keyboard_reply_t> grab(xcb_grab_keyboard_reply(connection(), c, NULL));
    if (grab.isNull()) {
        return false;
    }
    if (grab->status != XCB_GRAB_STATUS_SUCCESS) {
        return false;
    }
    keyboard_grabbed = true;
    return true;
}

void ungrabXKeyboard()
{
    if (!keyboard_grabbed) {
        // grabXKeyboard() may fail sometimes, so don't fail, but at least warn anyway
        qCDebug(KWIN_CORE) << "ungrabXKeyboard() called but keyboard not grabbed!";
    }
    keyboard_grabbed = false;
    xcb_ungrab_keyboard(connection(), XCB_TIME_CURRENT_TIME);
}

Process::Process(QObject *parent)
    : QProcess(parent)
{
}

Process::~Process() = default;

void Process::setupChildProcess()
{
    sigset_t userSiganls;
    sigemptyset(&userSiganls);
    sigaddset(&userSiganls, SIGUSR1);
    sigaddset(&userSiganls, SIGUSR2);
    pthread_sigmask(SIG_UNBLOCK, &userSiganls, nullptr);
}

#endif

// converting between X11 mouse/keyboard state mask and Qt button/keyboard states

int qtToX11Button(Qt::MouseButton button)
{
    if (button == Qt::LeftButton)
        return XCB_BUTTON_INDEX_1;
    else if (button == Qt::MidButton)
        return XCB_BUTTON_INDEX_2;
    else if (button == Qt::RightButton)
        return XCB_BUTTON_INDEX_3;
    return XCB_BUTTON_INDEX_ANY; // 0
}

Qt::MouseButton x11ToQtMouseButton(int button)
{
    if (button == XCB_BUTTON_INDEX_1)
        return Qt::LeftButton;
    if (button == XCB_BUTTON_INDEX_2)
        return Qt::MidButton;
    if (button == XCB_BUTTON_INDEX_3)
        return Qt::RightButton;
    if (button == XCB_BUTTON_INDEX_4)
        return Qt::XButton1;
    if (button == XCB_BUTTON_INDEX_5)
        return Qt::XButton2;
    return Qt::NoButton;
}

int qtToX11State(Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers)
{
    int ret = 0;
    if (buttons & Qt::LeftButton)
        ret |= XCB_KEY_BUT_MASK_BUTTON_1;
    if (buttons & Qt::MidButton)
        ret |= XCB_KEY_BUT_MASK_BUTTON_2;
    if (buttons & Qt::RightButton)
        ret |= XCB_KEY_BUT_MASK_BUTTON_3;
    if (modifiers & Qt::ShiftModifier)
        ret |= XCB_KEY_BUT_MASK_SHIFT;
    if (modifiers & Qt::ControlModifier)
        ret |= XCB_KEY_BUT_MASK_CONTROL;
    if (modifiers & Qt::AltModifier)
        ret |= KKeyServer::modXAlt();
    if (modifiers & Qt::MetaModifier)
        ret |= KKeyServer::modXMeta();
    return ret;
}

Qt::MouseButtons x11ToQtMouseButtons(int state)
{
    Qt::MouseButtons ret = 0;
    if (state & XCB_KEY_BUT_MASK_BUTTON_1)
        ret |= Qt::LeftButton;
    if (state & XCB_KEY_BUT_MASK_BUTTON_2)
        ret |= Qt::MidButton;
    if (state & XCB_KEY_BUT_MASK_BUTTON_3)
        ret |= Qt::RightButton;
    if (state & XCB_KEY_BUT_MASK_BUTTON_4)
        ret |= Qt::XButton1;
    if (state & XCB_KEY_BUT_MASK_BUTTON_5)
        ret |= Qt::XButton2;
    return ret;
}

Qt::KeyboardModifiers x11ToQtKeyboardModifiers(int state)
{
    Qt::KeyboardModifiers ret = 0;
    if (state & XCB_KEY_BUT_MASK_SHIFT)
        ret |= Qt::ShiftModifier;
    if (state & XCB_KEY_BUT_MASK_CONTROL)
        ret |= Qt::ControlModifier;
    if (state & KKeyServer::modXAlt())
        ret |= Qt::AltModifier;
    if (state & KKeyServer::modXMeta())
        ret |= Qt::MetaModifier;
    return ret;
}

} // namespace

#ifndef KCMRULES
#endif