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#include <QtMultimedia/qgraphicsvideoitem.h>

#include <QtMultimedia/qmediaobject.h>
#include <QtMultimedia/qmediaservice.h>
#include "qpaintervideosurface_p.h"
#include <QtMultimedia/qvideooutputcontrol.h>
#include <QtMultimedia/qvideorenderercontrol.h>

#include <QtMultimedia/qvideosurfaceformat.h>


QT_BEGIN_NAMESPACE

class QGraphicsVideoItemPrivate
{
public:
    QGraphicsVideoItemPrivate()
        : q_ptr(0)
        , surface(0)
        , mediaObject(0)
        , service(0)
        , outputControl(0)
        , rendererControl(0)
    {
    }

    QGraphicsVideoItem *q_ptr;

    QPainterVideoSurface *surface;
    QMediaObject *mediaObject;
    QMediaService *service;
    QVideoOutputControl *outputControl;
    QVideoRendererControl *rendererControl;
    QRect boundingRect;

    void clearService();

    void _q_present();
    void _q_formatChanged(const QVideoSurfaceFormat &format);
    void _q_serviceDestroyed();
    void _q_mediaObjectDestroyed();
};

void QGraphicsVideoItemPrivate::clearService()
{
    if (outputControl) {
        outputControl->setOutput(QVideoOutputControl::NoOutput);
        outputControl = 0;
    }
    if (rendererControl) {
        surface->stop();
        rendererControl->setSurface(0);
        rendererControl = 0;
    }
    if (service) {
        QObject::disconnect(service, SIGNAL(destroyed()), q_ptr, SLOT(_q_serviceDestroyed()));
        service = 0;
    }
}

void QGraphicsVideoItemPrivate::_q_present()
{
    q_ptr->update(boundingRect);
}

void QGraphicsVideoItemPrivate::_q_formatChanged(const QVideoSurfaceFormat &format)
{
    q_ptr->prepareGeometryChange();

    boundingRect = QRect(QPoint(0, 0), format.sizeHint());
    boundingRect.moveCenter(QPoint(0, 0));
}

void QGraphicsVideoItemPrivate::_q_serviceDestroyed()
{
    rendererControl = 0;
    outputControl = 0;
    service = 0;

    surface->stop();
}

void QGraphicsVideoItemPrivate::_q_mediaObjectDestroyed()
{
    mediaObject = 0;

    clearService();
}

/*!
    \class QGraphicsVideoItem

    \brief The QGraphicsVideoItem class provides a graphics item which display video produced by a QMediaObject.

    \ingroup multimedia

    Attaching a QGraphicsVideoItem to a QMediaObject allows it to display
    the video or image output of that media object.  A QGraphicsVideoItem
    is attached to a media object by passing a pointer to the QMediaObject
    to the setMediaObject() function.

    \code
    player = new QMediaPlayer(this);

    QGraphicsVideoItem *item = new QGraphicsVideoItem;
    item->setMediaObject(player);
    graphicsView->scence()->addItem(item);
    graphicsView->show();

    player->setMedia(video);
    player->play();
    \endcode

    \bold {Note}: Only a single display output can be attached to a media object at one time.

    \sa QMediaObject, QMediaPlayer, QVideoWidget
*/

/*!
    Constructs a graphics item that displays video.

    The \a parent is passed to QGraphicsItem.
*/
QGraphicsVideoItem::QGraphicsVideoItem(QGraphicsItem *parent)
    : QGraphicsItem(parent)
    , d_ptr(new QGraphicsVideoItemPrivate)
{
    d_ptr->q_ptr = this;
    d_ptr->surface = new QPainterVideoSurface;
}

/*!
    Destroys a video graphics item.
*/
QGraphicsVideoItem::~QGraphicsVideoItem()
{
    if (d_ptr->outputControl)
        d_ptr->outputControl->setOutput(QVideoOutputControl::NoOutput);

    if (d_ptr->rendererControl)
        d_ptr->rendererControl->setSurface(0);

    delete d_ptr->surface;
    delete d_ptr;
}

/*!
    \property QGraphicsVideoItem::mediaObject
    \brief the media object which provides the video displayed by a graphics item.
*/

QMediaObject *QGraphicsVideoItem::mediaObject() const
{
    return d_func()->mediaObject;
}

void QGraphicsVideoItem::setMediaObject(QMediaObject *object)
{
    Q_D(QGraphicsVideoItem);

    if (object == d->mediaObject)
        return;

    d->clearService();

    if (d->mediaObject) {
        disconnect(d->mediaObject, SIGNAL(destroyed()), this, SLOT(_q_mediaObjectDestroyed()));
        d->mediaObject->unbind(this);
    }

    d->mediaObject = object;

    if (d->mediaObject) {
        d->mediaObject->bind(this);

        connect(d->mediaObject, SIGNAL(destroyed()), this, SLOT(_q_mediaObjectDestroyed()));

        d->service = d->mediaObject->service();

        if (d->service) {
            connect(d->service, SIGNAL(destroyed()), this, SLOT(_q_serviceDestroyed()));

            d->outputControl = qobject_cast<QVideoOutputControl *>(
                    d->service->control(QVideoOutputControl_iid));
            d->rendererControl = qobject_cast<QVideoRendererControl *>(
                    d->service->control(QVideoRendererControl_iid));

            if (d->outputControl != 0 && d->rendererControl != 0) {
                if (!d->surface) {
                    d->surface = new QPainterVideoSurface;

                    connect(d->surface, SIGNAL(frameChanged()), this, SLOT(_q_present()));
                    connect(d->surface, SIGNAL(surfaceFormatChanged(QVideoSurfaceFormat)),
                            this, SLOT(_q_formatChanged(QVideoSurfaceFormat)));
                    connect(d->service, SIGNAL(destroyed()), this, SLOT(_q_serviceDestroyed()));
                }

                d->rendererControl->setSurface(d->surface);

                if (isVisible())
                    d->outputControl->setOutput(QVideoOutputControl::RendererOutput);
            }
        }
    }
}

/*!
    \reimp
*/
QRectF QGraphicsVideoItem::boundingRect() const
{
    return d_func()->boundingRect;
}

/*!
    \reimp
*/
void QGraphicsVideoItem::paint(
        QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    Q_D(QGraphicsVideoItem);

    Q_UNUSED(option);
    Q_UNUSED(widget);

    if (d->surface != 0) {
        d->surface->paint(painter, d->boundingRect);
        d->surface->setReady(true);
    }
}

/*!
    \reimp

    \internal
*/
QVariant QGraphicsVideoItem::itemChange(GraphicsItemChange change, const QVariant &value)
{
    Q_D(QGraphicsVideoItem);

    if (change == ItemVisibleChange && d->outputControl != 0 && d->rendererControl != 0) {
        if (value.toBool()) {
            d->outputControl->setOutput(QVideoOutputControl::RendererOutput);

            return d->outputControl->output() == QVideoOutputControl::RendererOutput;
        } else {
            d->outputControl->setOutput(QVideoOutputControl::NoOutput);

            return value;
        }
    } else {
        return QGraphicsItem::itemChange(change, value);
    }
}

QT_END_NAMESPACE

#include "moc_qgraphicsvideoitem.cpp"