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#include "mmrendererplayervideorenderercontrol.h"

#include "windowgrabber.h"

#include <QCoreApplication>
#include <QDebug>
#include <QVideoSurfaceFormat>
#include <QOpenGLContext>

#include <mm/renderer.h>

QT_BEGIN_NAMESPACE

static int winIdCounter = 0;

MmRendererPlayerVideoRendererControl::MmRendererPlayerVideoRendererControl(QObject *parent)
    : QVideoRendererControl(parent)
    , m_windowGrabber(new WindowGrabber(this))
    , m_context(0)
    , m_videoId(-1)
{
    connect(m_windowGrabber, SIGNAL(frameGrabbed(QImage, int)), SLOT(frameGrabbed(QImage, int)));
}

MmRendererPlayerVideoRendererControl::~MmRendererPlayerVideoRendererControl()
{
    detachDisplay();
}

QAbstractVideoSurface *MmRendererPlayerVideoRendererControl::surface() const
{
    return m_surface;
}

void MmRendererPlayerVideoRendererControl::setSurface(QAbstractVideoSurface *surface)
{
    m_surface = QPointer<QAbstractVideoSurface>(surface);
    if (QOpenGLContext::currentContext())
        m_windowGrabber->checkForEglImageExtension();
    else
        m_surface->setProperty("_q_GLThreadCallback", QVariant::fromValue<QObject*>(this));
}

void MmRendererPlayerVideoRendererControl::attachDisplay(mmr_context_t *context)
{
    if (m_videoId != -1) {
        qWarning() << "MmRendererPlayerVideoRendererControl: Video output already attached!";
        return;
    }

    if (!context) {
        qWarning() << "MmRendererPlayerVideoRendererControl: No media player context!";
        return;
    }

    const QByteArray windowGroupId = m_windowGrabber->windowGroupId();
    if (windowGroupId.isEmpty()) {
        qWarning() << "MmRendererPlayerVideoRendererControl: Unable to find window group";
        return;
    }

    const QString windowName = QStringLiteral("MmRendererPlayerVideoRendererControl_%1_%2")
                                             .arg(winIdCounter++)
                                             .arg(QCoreApplication::applicationPid());

    m_windowGrabber->setWindowId(windowName.toLatin1());

    // Start with an invisible window, because we just want to grab the frames from it.
    const QString videoDeviceUrl = QStringLiteral("screen:?winid=%1&wingrp=%2&initflags=invisible&nodstviewport=1")
                                                 .arg(windowName)
                                                 .arg(QString::fromLatin1(windowGroupId));

    m_videoId = mmr_output_attach(context, videoDeviceUrl.toLatin1(), "video");
    if (m_videoId == -1) {
        qWarning() << "mmr_output_attach() for video failed";
        return;
    }

    m_context = context;
}

void MmRendererPlayerVideoRendererControl::detachDisplay()
{
    m_windowGrabber->stop();

    if (m_surface)
        m_surface->stop();

    if (m_context && m_videoId != -1)
        mmr_output_detach(m_context, m_videoId);

    m_context = 0;
    m_videoId = -1;
}

void MmRendererPlayerVideoRendererControl::pause()
{
    m_windowGrabber->pause();
}

void MmRendererPlayerVideoRendererControl::resume()
{
    m_windowGrabber->resume();
}

class BBTextureBuffer : public QAbstractVideoBuffer
{
public:
    BBTextureBuffer(int handle) :
        QAbstractVideoBuffer(QAbstractVideoBuffer::GLTextureHandle)
    {
        m_handle = handle;
    }
    MapMode mapMode() const {
        return QAbstractVideoBuffer::ReadWrite;
    }
    void unmap() {

    }
    uchar *map(MapMode mode, int * numBytes, int * bytesPerLine) {
        Q_UNUSED(mode);
        Q_UNUSED(numBytes);
        Q_UNUSED(bytesPerLine);
        return 0;
    }
    QVariant handle() const {
        return m_handle;
    }
private:
    int m_handle;
};

void MmRendererPlayerVideoRendererControl::frameGrabbed(const QImage &frame, int handle)
{
    if (m_surface) {
        if (!m_surface->isActive()) {
            if (m_windowGrabber->eglImageSupported()) {
                if (QOpenGLContext::currentContext())
                    m_windowGrabber->createEglImages();
                else
                    m_surface->setProperty("_q_GLThreadCallback", QVariant::fromValue<QObject*>(this));

                m_surface->start(QVideoSurfaceFormat(frame.size(), QVideoFrame::Format_BGR32,
                                                 QAbstractVideoBuffer::GLTextureHandle));
            } else {
                m_surface->start(QVideoSurfaceFormat(frame.size(), QVideoFrame::Format_ARGB32));
            }
        } else {
            if (m_surface->surfaceFormat().frameSize() != frame.size()) {
                QAbstractVideoBuffer::HandleType type = m_surface->surfaceFormat().handleType();
                m_surface->stop();
                if (type != QAbstractVideoBuffer::NoHandle) {
                    m_surface->setProperty("_q_GLThreadCallback", QVariant::fromValue<QObject*>(this));
                    m_surface->start(QVideoSurfaceFormat(frame.size(), QVideoFrame::Format_BGR32,
                                                     QAbstractVideoBuffer::GLTextureHandle));
                } else {
                    m_surface->start(QVideoSurfaceFormat(frame.size(), QVideoFrame::Format_ARGB32));
                }
            }
        }

        // Depending on the support of EGL images on the current platform we either pass a texture
        // handle or a copy of the image data
        if (m_surface->surfaceFormat().handleType() != QAbstractVideoBuffer::NoHandle) {
            if (m_windowGrabber->eglImagesInitialized() &&
                    m_surface->property("_q_GLThreadCallback") != 0)
                m_surface->setProperty("_q_GLThreadCallback", 0);


            BBTextureBuffer *textBuffer = new BBTextureBuffer(handle);
            QVideoFrame actualFrame(textBuffer, frame.size(), QVideoFrame::Format_BGR32);
            m_surface->present(actualFrame);
        } else {
            m_surface->present(frame.copy());
        }
    }
}

void MmRendererPlayerVideoRendererControl::customEvent(QEvent *e)
{
    // This is running in the render thread (OpenGL enabled)
    if (e->type() == QEvent::User)
        m_windowGrabber->checkForEglImageExtension();
    else if (e->type() == QEvent::User + 1)
        m_windowGrabber->createEglImages();
}

QT_END_NAMESPACE