/****************************************************************************
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** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
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** This file is part of the Qt3D module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
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** packaging of this file. Please review the following information to
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****************************************************************************/

#ifndef QT3DRENDER_QRAYCASTINGSERVICE_P_H
#define QT3DRENDER_QRAYCASTINGSERVICE_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <Qt3DCore/qt3dcore_global.h>
#include <Qt3DRender/private/qabstractcollisionqueryservice_p.h>
#include <Qt3DRender/private/qray3d_p.h>

#include <QHash>
#include <QtConcurrent>
#include <QAtomicInt>

QT_BEGIN_NAMESPACE

namespace Qt3DRender {

class QBoundingVolumeProvider;
class QRayCastingServicePrivate;

typedef QFuture<QCollisionQueryResult> FutureQueryResult;

class QT3DRENDERSHARED_EXPORT QRayCastingService : public QAbstractCollisionQueryService
{
public:
    QRayCastingService();

    QQueryHandle query(const QRay3D &ray, QueryMode mode, QBoundingVolumeProvider *provider) Q_DECL_OVERRIDE;
    QCollisionQueryResult::Hit query(const QRay3D &ray, const QBoundingVolume *volume) Q_DECL_OVERRIDE;

    QCollisionQueryResult fetchResult(const QQueryHandle &handle) Q_DECL_OVERRIDE;
    QVector<QCollisionQueryResult> fetchAllResults() const Q_DECL_OVERRIDE;

protected:
    QRayCastingService(QRayCastingServicePrivate &dd);

private:
    Q_DISABLE_COPY(QRayCastingService)
    Q_DECLARE_PRIVATE(QRayCastingService)
};

class QRayCastingServicePrivate : public QAbstractCollisionQueryServicePrivate
{
public:
    QRayCastingServicePrivate(const QString &description);

    QCollisionQueryResult collides(const QRay3D &ray,
                                   QBoundingVolumeProvider *provider,
                                   QAbstractCollisionQueryService::QueryMode mode,
                                   const QQueryHandle &handle);
    QCollisionQueryResult::Hit collides(const QRay3D &ray,
                                        const QBoundingVolume *volume);

    Q_DECLARE_PUBLIC(QRayCastingService)

    struct Query
    {
        QQueryHandle handle;
        QRay3D ray;
        QRayCastingService::QueryMode mode;
    };

    QHash<QQueryHandle, FutureQueryResult> m_results;
    QAtomicInt m_handlesCount;
};

} // namespace Qt3DRender

QT_END_NAMESPACE

#endif // QT3DRENDER_QRAYCASTINGSERVICE_P_H
