/****************************************************************************
**
** Copyright (C) 2015 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2016 Pelagicore AG
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** General Public License version 2.0 or (at your option) the GNU General
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****************************************************************************/

#include "qeglfskmsgbmintegration.h"
#include "qeglfskmsgbmdevice.h"
#include "qeglfskmsgbmscreen.h"
#include "qeglfskmsgbmcursor.h"
#include "private/qeglfscursor_p.h"

#include <QtDeviceDiscoverySupport/private/qdevicediscovery_p.h>
#include <QtCore/QLoggingCategory>
#include <QtCore/QJsonDocument>
#include <QtCore/QJsonObject>
#include <QtCore/QJsonArray>
#include <QtGui/qpa/qplatformwindow.h>
#include <QtGui/qpa/qplatformcursor.h>
#include <QtGui/QScreen>

#include <xf86drm.h>
#include <xf86drmMode.h>
#include <gbm.h>

QT_BEGIN_NAMESPACE

QMutex QEglFSKmsGbmScreen::m_waitForFlipMutex;

QEglFSKmsGbmIntegration::QEglFSKmsGbmIntegration()
{
    qCDebug(qLcEglfsKmsDebug, "New DRM/KMS via GBM integration created");
}

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

    QEglFSKmsGbmScreen *screen = static_cast<QEglFSKmsGbmScreen *>(platformWindow->screen());
    if (screen->surface()) {
        qWarning("Only single window per screen supported!");
        return 0;
    }

    return reinterpret_cast<EGLNativeWindowType>(screen->createSurface());
}

EGLNativeWindowType QEglFSKmsGbmIntegration::createNativeOffscreenWindow(const QSurfaceFormat &format)
{
    Q_UNUSED(format);
    Q_ASSERT(device());

    qCDebug(qLcEglfsKmsDebug) << "Creating native off screen window";
    gbm_surface *surface = gbm_surface_create(static_cast<QEglFSKmsGbmDevice *>(device())->gbmDevice(),
                                              1, 1,
                                              GBM_FORMAT_XRGB8888,
                                              GBM_BO_USE_RENDERING);

    return reinterpret_cast<EGLNativeWindowType>(surface);
}

void QEglFSKmsGbmIntegration::destroyNativeWindow(EGLNativeWindowType window)
{
    gbm_surface *surface = reinterpret_cast<gbm_surface *>(window);
    gbm_surface_destroy(surface);
}

QPlatformCursor *QEglFSKmsGbmIntegration::createCursor(QPlatformScreen *screen) const
{
#if QT_CONFIG(opengl)
    if (!screenConfig()->hwCursor()) {
        qCDebug(qLcEglfsKmsDebug, "Using plain OpenGL mouse cursor");
        return new QEglFSCursor(screen);
    }
#endif
    return nullptr;
}

void QEglFSKmsGbmIntegration::presentBuffer(QPlatformSurface *surface)
{
    QWindow *window = static_cast<QWindow *>(surface->surface());
    QEglFSKmsScreen *screen = static_cast<QEglFSKmsScreen *>(window->screen()->handle());

    screen->flip();
}

QKmsDevice *QEglFSKmsGbmIntegration::createDevice()
{
    QString path = screenConfig()->devicePath();
    if (!path.isEmpty()) {
        qCDebug(qLcEglfsKmsDebug) << "GBM: Using DRM device" << path << "specified in config file";
    } else {
        QDeviceDiscovery *d = QDeviceDiscovery::create(QDeviceDiscovery::Device_VideoMask);
        const QStringList devices = d->scanConnectedDevices();
        qCDebug(qLcEglfsKmsDebug) << "Found the following video devices:" << devices;
        d->deleteLater();

        if (Q_UNLIKELY(devices.isEmpty()))
            qFatal("Could not find DRM device!");

        path = devices.first();
        qCDebug(qLcEglfsKmsDebug) << "Using" << path;
    }

    return new QEglFSKmsGbmDevice(screenConfig(), path);
}

QT_END_NAMESPACE