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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
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****************************************************************************/

#include "qnodecreatedchange.h"
#include "qnodecreatedchange_p.h"
#include <Qt3DCore/qnode.h>
#include <QtCore/qmetaobject.h>
#include <QtCore/private/qmetaobject_p.h>

QT_BEGIN_NAMESPACE

namespace {

/*! \internal */
inline const QMetaObjectPrivate *priv(const uint* data)
{
    return reinterpret_cast<const QMetaObjectPrivate*>(data);
}

/*! \internal */
inline bool isDynamicMetaObject(const QMetaObject *mo)
{
    return (priv(mo->d.data)->flags & DynamicMetaObject);
}

/*!
 * \internal
 *
 * Find the most derived metaobject that doesn't have a dynamic
 * metaobject farther up the chain.
 * TODO: Add support to QMetaObject to explicitly say if it's a dynamic
 * or static metaobject so we don't need this logic
 */
const QMetaObject *findStaticMetaObject(const QMetaObject *metaObject)
{
    const QMetaObject *lastStaticMetaobject = nullptr;
    auto mo = metaObject;
    while (mo) {
        const bool dynamicMetaObject = isDynamicMetaObject(mo);
        if (dynamicMetaObject)
            lastStaticMetaobject = nullptr;

        if (!dynamicMetaObject && !lastStaticMetaobject)
            lastStaticMetaobject = mo;

        mo = mo->superClass();
    }
    Q_ASSERT(lastStaticMetaobject);
    return lastStaticMetaobject;
}

}

namespace Qt3DCore {

QNodeCreatedChangeBasePrivate::QNodeCreatedChangeBasePrivate(const QNode *node)
    : QSceneChangePrivate()
    , m_parentId(node->parentNode() ? node->parentNode()->id() : QNodeId())
    , m_metaObject(findStaticMetaObject(node->metaObject()))
    , m_nodeEnabled(node->isEnabled())
{
}

/*!
 * \class Qt3DCore::QNodeCreatedChangeBase
 * \inherits Qt3DCore::QSceneChange
 * \inmodule Qt3DCore
 * \brief The QNodeCreatedChangeBase class is the base class for all NodeCreated QSceneChange events
 *
 * The QNodeCreatedChangeBase class is the base class for all QSceneChange events that
 * have the changeType() NodeCreated. You should not need to instantiate this class.
 * Usually you should be using one of its subclasses such as QNodeCreatedChange.
 *
 * You can subclass this to create your own node update types for communication between
 * your QNode and QBackendNode subclasses when writing your own aspects.
 */

/*!
 * \typedef Qt3DCore::QNodeCreatedChangeBasePtr
 * \relates Qt3DCore::QNodeCreatedChangeBase
 *
 * A shared pointer for QNodeCreatedChangeBase.
 */

/*!
 * Constructs a new QNodeCreatedChangeBase with \a node.
 */
QNodeCreatedChangeBase::QNodeCreatedChangeBase(const QNode *node)
    : QSceneChange(*new QNodeCreatedChangeBasePrivate(node), NodeCreated, node->id())
{
}

QNodeCreatedChangeBase::QNodeCreatedChangeBase(QNodeCreatedChangeBasePrivate &dd, const QNode *node)
    : QSceneChange(dd, NodeCreated, node->id())
{
}

QNodeCreatedChangeBase::~QNodeCreatedChangeBase()
{
}

/*!
 * \return parent id.
 */
QNodeId QNodeCreatedChangeBase::parentId() const Q_DECL_NOTHROW
{
    Q_D(const QNodeCreatedChangeBase);
    return d->m_parentId;
}

/*!
 * \return metaobject.
 */
const QMetaObject *QNodeCreatedChangeBase::metaObject() const Q_DECL_NOTHROW
{
    Q_D(const QNodeCreatedChangeBase);
    return d->m_metaObject;
}

/*!
 * \return node enabled.
 */
bool QNodeCreatedChangeBase::isNodeEnabled() const Q_DECL_NOTHROW
{
    Q_D(const QNodeCreatedChangeBase);
    return d->m_nodeEnabled;
}

} // namespace Qt3DCore

/*!
 * \class Qt3DCore::QNodeCreatedChange
 * \inherits Qt3DCore::QNodeCreatedChangeBase
 * \since 5.7
 * \inmodule Qt3DCore
 * \brief Used to notify when a node is created.
 */

QT_END_NAMESPACE
