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#include "qrendertarget.h"
#include "qrendertarget_p.h"
#include "qrendertargetoutput.h"
#include <Qt3DCore/qpropertyupdatedchange.h>
#include <Qt3DCore/qpropertynodeaddedchange.h>
#include <Qt3DCore/qpropertynoderemovedchange.h>

QT_BEGIN_NAMESPACE

using namespace Qt3DCore;

namespace Qt3DRender {

/*!
 * \class Qt3DRender::QRenderTarget
 * \brief The QRenderTarget class encapsulates a target (usually a frame buffer
 * object) which the renderer can render into.
 * \since 5.7
 * \inmodule Qt3DRender
 */

/*! \internal */
QRenderTargetPrivate::QRenderTargetPrivate()
    : QComponentPrivate()
{
}

/*!
 * The constructor creates a new QRenderTarget::QRenderTarget instance with
 * the specified \a parent.
 */
QRenderTarget::QRenderTarget(QNode *parent)
    : QComponent(*new QRenderTargetPrivate, parent)
{
}

/*! \internal */
QRenderTarget::~QRenderTarget()
{
}

/*! \internal */
QRenderTarget::QRenderTarget(QRenderTargetPrivate &dd, QNode *parent)
    : QComponent(dd, parent)
{
}

/*!
 * Adds a chosen output via \a output.
 * \param output
 */
void QRenderTarget::addOutput(QRenderTargetOutput *output)
{
    Q_D(QRenderTarget);
    if (output && !d->m_outputs.contains(output)) {
        d->m_outputs.append(output);

        // Ensures proper bookkeeping
        d->registerDestructionHelper(output, &QRenderTarget::removeOutput, d->m_outputs);

        if (!output->parent())
            output->setParent(this);

        if (d->m_changeArbiter != nullptr) {
            const auto change = QPropertyNodeAddedChangePtr::create(id(), output);
            change->setPropertyName("output");
            d->notifyObservers(change);
        }
    }
}

/*!
 * Removes a chosen output via \a output.
 * \param output
 */
void QRenderTarget::removeOutput(QRenderTargetOutput *output)
{
    Q_D(QRenderTarget);

    if (output && d->m_changeArbiter != nullptr) {
        const auto change = QPropertyNodeRemovedChangePtr::create(id(), output);
        change->setPropertyName("output");
        d->notifyObservers(change);
    }
    d->m_outputs.removeOne(output);
    // Remove bookkeeping connection
    d->unregisterDestructionHelper(output);
}

/*!
 * \return the chosen outputs.
 */
QVector<QRenderTargetOutput *> QRenderTarget::outputs() const
{
    Q_D(const QRenderTarget);
    return d->m_outputs;
}

Qt3DCore::QNodeCreatedChangeBasePtr QRenderTarget::createNodeCreationChange() const
{
    auto creationChange = Qt3DCore::QNodeCreatedChangePtr<QRenderTargetData>::create(this);
    auto &data = creationChange->data;
    data.outputIds = qIdsForNodes(outputs());
    return creationChange;
}

} // namespace Qt3DRender

QT_END_NAMESPACE