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** $QT_END_LICENSE$
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****************************************************************************/

#ifndef CUSTOMAFFECTOR_H
#define CUSTOMAFFECTOR_H

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

#include <QObject>
#include <QtQml/qqml.h>
#include "qquickparticlesystem_p.h"
#include "qquickparticleextruder_p.h"
#include "qquickparticleaffector_p.h"
#include "qquickdirection_p.h"

QT_BEGIN_NAMESPACE

class QQuickCustomAffector : public QQuickParticleAffector
{
    Q_OBJECT
    Q_PROPERTY(bool relative READ relative WRITE setRelative NOTIFY relativeChanged)
    Q_PROPERTY(QQuickDirection *position READ position WRITE setPosition NOTIFY positionChanged RESET positionReset)
    Q_PROPERTY(QQuickDirection *velocity READ velocity WRITE setVelocity NOTIFY velocityChanged RESET velocityReset)
    Q_PROPERTY(QQuickDirection *acceleration READ acceleration WRITE setAcceleration NOTIFY accelerationChanged RESET accelerationReset)
    QML_NAMED_ELEMENT(Affector)

public:
    explicit QQuickCustomAffector(QQuickItem *parent = 0);
    void affectSystem(qreal dt) override;

    QQuickDirection * position() const
    {
        return m_position;
    }

    QQuickDirection * velocity() const
    {
        return m_velocity;
    }

    QQuickDirection * acceleration() const
    {
        return m_acceleration;
    }

    void positionReset()
    {
        m_position = &m_nullVector;
    }

    void velocityReset()
    {
        m_velocity = &m_nullVector;
    }

    void accelerationReset()
    {
        m_acceleration = &m_nullVector;
    }

    bool relative() const
    {
        return m_relative;
    }


Q_SIGNALS:
    void affectParticles(const QJSValue &particles, qreal dt);

    void positionChanged(QQuickDirection * arg);

    void velocityChanged(QQuickDirection * arg);

    void accelerationChanged(QQuickDirection * arg);

    void relativeChanged(bool arg);

public Q_SLOTS:
    void setPosition(QQuickDirection * arg)
    {
        if (m_position != arg) {
            m_position = arg;
            Q_EMIT positionChanged(arg);
        }
    }

    void setVelocity(QQuickDirection * arg)
    {
        if (m_velocity != arg) {
            m_velocity = arg;
            Q_EMIT velocityChanged(arg);
        }
    }

    void setAcceleration(QQuickDirection * arg)
    {
        if (m_acceleration != arg) {
            m_acceleration = arg;
            Q_EMIT accelerationChanged(arg);
        }
    }

    void setRelative(bool arg)
    {
        if (m_relative != arg) {
            m_relative = arg;
            Q_EMIT relativeChanged(arg);
        }
    }

protected:
    bool isAffectConnected();
    bool affectParticle(QQuickParticleData *d, qreal dt) override;

private:
    void affectProperties(const QList<QQuickParticleData*> &particles, qreal dt);
    QQuickDirection * m_position;
    QQuickDirection * m_velocity;
    QQuickDirection * m_acceleration;

    QQuickDirection m_nullVector;
    bool m_relative;
};

QT_END_NAMESPACE
#endif // CUSTOMAFFECTOR_H