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

Copyright (C) 2016, 2017 Martin Gräßlin <mgraesslin@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/>.
*********************************************************************/
#include "keyboard_layout.h"
#include "keyboard_input.h"
#include "input_event.h"
#include "main.h"
#include "platform.h"

#include <KGlobalAccel>
#include <QAction>
#include <QDBusConnection>
#include <QDBusMessage>
#include <QDBusPendingCall>

namespace KWin
{

KeyboardLayout::KeyboardLayout(Xkb *xkb)
    : QObject()
    , m_xkb(xkb)
{
}

KeyboardLayout::~KeyboardLayout() = default;

void KeyboardLayout::init()
{
    QAction *switchKeyboardAction = new QAction(this);
    switchKeyboardAction->setObjectName(QStringLiteral("Switch to Next Keyboard Layout"));
    switchKeyboardAction->setProperty("componentName", QStringLiteral("KDE Keyboard Layout Switcher"));
    const QKeySequence sequence = QKeySequence(Qt::ALT+Qt::CTRL+Qt::Key_K);
    KGlobalAccel::self()->setDefaultShortcut(switchKeyboardAction, QList<QKeySequence>({sequence}));
    KGlobalAccel::self()->setShortcut(switchKeyboardAction, QList<QKeySequence>({sequence}));
    kwinApp()->platform()->setupActionForGlobalAccel(switchKeyboardAction);
    connect(switchKeyboardAction, &QAction::triggered, this,
        [this] {
            m_xkb->switchToNextLayout();
            checkLayoutChange();
        }
    );

    QDBusConnection::sessionBus().connect(QString(),
                                          QStringLiteral("/Layouts"),
                                          QStringLiteral("org.kde.keyboard"),
                                          QStringLiteral("reloadConfig"),
                                          this,
                                          SLOT(reconfigure()));

    reconfigure();
}

void KeyboardLayout::reconfigure()
{
    m_xkb->reconfigure();
    resetLayout();
}

void KeyboardLayout::resetLayout()
{
    m_layout = m_xkb->currentLayout();
}

void KeyboardLayout::keyEvent(KeyEvent *event)
{
    if (!event->isAutoRepeat()) {
        checkLayoutChange();
    }
}

void KeyboardLayout::checkLayoutChange()
{
    const auto layout = m_xkb->currentLayout();
    if (m_layout == layout) {
        return;
    }
    m_layout = layout;
    notifyLayoutChange();
}

void KeyboardLayout::notifyLayoutChange()
{
    // notify OSD service about the new layout
    if (!kwinApp()->usesLibinput()) {
        return;
    }
    // only if kwin is in charge of keyboard input
    QDBusMessage msg = QDBusMessage::createMethodCall(
        QStringLiteral("org.kde.plasmashell"),
        QStringLiteral("/org/kde/osdService"),
        QStringLiteral("org.kde.osdService"),
        QStringLiteral("kbdLayoutChanged"));

    msg << m_xkb->layoutName();

    QDBusConnection::sessionBus().asyncCall(msg);
}

}