/* BEGIN_COMMON_COPYRIGHT_HEADER
 * (c)LGPL2+
 *
 * LXDE-Qt - a lightweight, Qt based, desktop toolset
 * http://razor-qt.org
 *
 * Copyright: 2010-2011 Razor team
 * Authors:
 *   Petr Vanek <petr@scribus.info>
 *
 * This program or library is free software; you can redistribute it
 * and/or modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA
 *
 * END_COMMON_COPYRIGHT_HEADER */

#include <QToolButton>
#include <QAction>
#include <QX11Info>
#include <lxqt-globalkeys.h>
#include <XdgIcon>
#include <LXQt/Notification>
#include <KF5/KWindowSystem/KWindowSystem>
#include <KF5/KWindowSystem/NETWM>
#include "showdesktop.h"

// Still needed for lxde/lxqt#338
#include <X11/Xlib.h>
#include <X11/Xatom.h>

#define DEFAULT_SHORTCUT "Control+Alt+D"

ShowDesktop::ShowDesktop(const ILxQtPanelPluginStartupInfo &startupInfo) :
    QObject(),
    ILxQtPanelPlugin(startupInfo)
{
    m_key = GlobalKeyShortcut::Client::instance()->addAction(QString(), QString("/panel/%1/show_hide").arg(settings()->group()), tr("Show desktop"), this);
    if (m_key)
    {
        connect(m_key, SIGNAL(activated()), this, SLOT(toggleShowingDesktop()));

        if (m_key->shortcut().isEmpty())
        {
            m_key->changeShortcut(DEFAULT_SHORTCUT);
            if (m_key->shortcut().isEmpty())
            {
                LxQt::Notification::notify(tr("Show Desktop: Global shortcut '%1' cannot be registered").arg(DEFAULT_SHORTCUT));
            }
        }
    }

    QAction * act = new QAction(XdgIcon::fromTheme("user-desktop"), tr("Show Desktop"), this);
    connect(act, SIGNAL(triggered()), this, SLOT(toggleShowingDesktop()));

    mButton.setDefaultAction(act);
    mButton.setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
}

void ShowDesktop::toggleShowingDesktop()
{
    // Paulo: KWindowSystem is not working for Openbox here, see lxde/lxqt#338
    // KWindowSystem fix: https://git.reviewboard.kde.org/r/121667
    // NETRootInfo info(QX11Info::connection(), NET::WMDesktop);
    // info.setShowingDesktop(!KWindowSystem::showingDesktop());

    const char *atomStr = "_NET_SHOWING_DESKTOP";
    xcb_intern_atom_cookie_t cookie = xcb_intern_atom(QX11Info::connection(), false, strlen(atomStr), atomStr);
    xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(QX11Info::connection(), cookie, 0);
    xcb_atom_t showing_desktop_atom = reply->atom;
    free(reply);

    uint32_t data[5] = {
        uint32_t(KWindowSystem::showingDesktop() ? 0 : 1), 0, 0, 0, 0
    };

    xcb_client_message_event_t event;
    event.response_type = XCB_CLIENT_MESSAGE;
    event.format = 32;
    event.sequence = 0;
    event.window = QX11Info::appRootWindow();
    event.type = showing_desktop_atom;
    for (int i = 0; i < 5; i++)
        event.data.data32[i] = data[i];

    xcb_send_event(QX11Info::connection(), false, QX11Info::appRootWindow(),
                   (XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT | XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY),
                   (const char *) &event);
}

#undef DEFAULT_SHORTCUT