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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qeglfsx11integration.h"
#include <QThread>

#include <X11/Xlib.h>
#include <X11/Xlib-xcb.h>

/* Make no mistake: This is not a replacement for the xcb platform plugin.
   This here is barely an extremely useful tool for developing eglfs itself because
   it allows to do so without any requirements for devices or drivers. */

QT_BEGIN_NAMESPACE

class EventReader : public QThread
{
public:
    EventReader(QEglFSX11Integration *integration)
        : m_integration(integration) { }

    void run() override;

private:
    QEglFSX11Integration *m_integration;
};

QAtomicInt running;

void EventReader::run()
{
    xcb_generic_event_t *event = nullptr;
    while (running.load() && (event = xcb_wait_for_event(m_integration->connection()))) {
        uint response_type = event->response_type & ~0x80;
        switch (response_type) {
        case XCB_CLIENT_MESSAGE: {
            xcb_client_message_event_t *client = (xcb_client_message_event_t *) event;
            const xcb_atom_t *atoms = m_integration->atoms();
            if (client->format == 32
                && client->type == atoms[Atoms::WM_PROTOCOLS]
                && client->data.data32[0] == atoms[Atoms::WM_DELETE_WINDOW]) {
                QWindow *window = m_integration->platformWindow() ? m_integration->platformWindow()->window() : 0;
                if (window)
                    QWindowSystemInterface::handleCloseEvent(window);
            }
            break;
            }
        default:
            break;
        }
    }
}

void QEglFSX11Integration::sendConnectionEvent(xcb_atom_t a)
{
    xcb_client_message_event_t event;
    memset(&event, 0, sizeof(event));

    event.response_type = XCB_CLIENT_MESSAGE;
    event.format = 32;
    event.sequence = 0;
    event.window = m_connectionEventListener;
    event.type = a;

    xcb_send_event(m_connection, false, m_connectionEventListener, XCB_EVENT_MASK_NO_EVENT, (const char *)&event);
    xcb_flush(m_connection);
}

#define DISPLAY ((Display *) m_display)

void QEglFSX11Integration::platformInit()
{
    m_display = XOpenDisplay(0);
    if (Q_UNLIKELY(!m_display))
        qFatal("Could not open display");

    XSetEventQueueOwner(DISPLAY, XCBOwnsEventQueue);
    m_connection = XGetXCBConnection(DISPLAY);

    running.ref();

    xcb_screen_iterator_t it = xcb_setup_roots_iterator(xcb_get_setup(m_connection));

    m_connectionEventListener = xcb_generate_id(m_connection);
    xcb_create_window(m_connection, XCB_COPY_FROM_PARENT,
                      m_connectionEventListener, it.data->root,
                      0, 0, 1, 1, 0, XCB_WINDOW_CLASS_INPUT_ONLY,
                      it.data->root_visual, 0, 0);

    m_eventReader = new EventReader(this);
    m_eventReader->start();
}

void QEglFSX11Integration::platformDestroy()
{
    running.deref();

    sendConnectionEvent(XCB_ATOM_NONE);

    m_eventReader->wait();
    delete m_eventReader;
    m_eventReader = 0;

    XCloseDisplay(DISPLAY);
    m_display = 0;
    m_connection = 0;
}

EGLNativeDisplayType QEglFSX11Integration::platformDisplay() const
{
    return DISPLAY;
}

QSize QEglFSX11Integration::screenSize() const
{
    if (m_screenSize.isEmpty()) {
        QList<QByteArray> env = qgetenv("EGLFS_X11_SIZE").split('x');
        if (env.length() == 2) {
            m_screenSize = QSize(env.at(0).toInt(), env.at(1).toInt());
        } else {
            XWindowAttributes a;
            if (XGetWindowAttributes(DISPLAY, DefaultRootWindow(DISPLAY), &a))
                m_screenSize = QSize(a.width, a.height);
        }
    }
    return m_screenSize;
}

EGLNativeWindowType QEglFSX11Integration::createNativeWindow(QPlatformWindow *platformWindow,
                                                       const QSize &size,
                                                       const QSurfaceFormat &format)
{
    Q_UNUSED(format);

    m_platformWindow = platformWindow;

    xcb_screen_iterator_t it = xcb_setup_roots_iterator(xcb_get_setup(m_connection));
    m_window = xcb_generate_id(m_connection);
    xcb_create_window(m_connection, XCB_COPY_FROM_PARENT, m_window, it.data->root,
                      0, 0, size.width(), size.height(), 0,
                      XCB_WINDOW_CLASS_INPUT_OUTPUT, it.data->root_visual,
                      0, 0);

    xcb_intern_atom_cookie_t cookies[Atoms::N_ATOMS];
    static const char *atomNames[Atoms::N_ATOMS] = {
        "_NET_WM_NAME",
        "UTF8_STRING",
        "WM_PROTOCOLS",
        "WM_DELETE_WINDOW",
        "_NET_WM_STATE",
        "_NET_WM_STATE_FULLSCREEN"
    };

    for (int i = 0; i < Atoms::N_ATOMS; ++i) {
        cookies[i] = xcb_intern_atom(m_connection, false, strlen(atomNames[i]), atomNames[i]);
        xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(m_connection, cookies[i], 0);
        m_atoms[i] = reply->atom;
        free(reply);
    }

    // Set window title
    xcb_change_property(m_connection, XCB_PROP_MODE_REPLACE, m_window,
                        m_atoms[Atoms::_NET_WM_NAME], m_atoms[Atoms::UTF8_STRING], 8, 5, "EGLFS");

    // Enable WM_DELETE_WINDOW
    xcb_change_property(m_connection, XCB_PROP_MODE_REPLACE, m_window,
                        m_atoms[Atoms::WM_PROTOCOLS], XCB_ATOM_ATOM, 32, 1, &m_atoms[Atoms::WM_DELETE_WINDOW]);

    // Go fullscreen.
    xcb_change_property(m_connection, XCB_PROP_MODE_REPLACE, m_window,
                        m_atoms[Atoms::_NET_WM_STATE], XCB_ATOM_ATOM, 32, 1, &m_atoms[Atoms::_NET_WM_STATE_FULLSCREEN]);

    xcb_map_window(m_connection, m_window);

    xcb_flush(m_connection);

    return qt_egl_cast<EGLNativeWindowType>(m_window);
}

void QEglFSX11Integration::destroyNativeWindow(EGLNativeWindowType window)
{
    xcb_destroy_window(m_connection, qt_egl_cast<xcb_window_t>(window));
}

bool QEglFSX11Integration::hasCapability(QPlatformIntegration::Capability cap) const
{
    Q_UNUSED(cap);
    return false;
}

QT_END_NAMESPACE