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#ifndef PARTICLEAFFECTOR_H
#define PARTICLEAFFECTOR_H

#include <QObject>
#include "qsgparticlesystem_p.h"
#include "qsgparticleextruder_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

class QSGParticleAffector : public QSGItem
{
    Q_OBJECT
    Q_PROPERTY(QSGParticleSystem* system READ system WRITE setSystem NOTIFY systemChanged)
    Q_PROPERTY(QStringList particles READ particles WRITE setParticles NOTIFY particlesChanged)
    Q_PROPERTY(QStringList collisionParticles READ collisionParticles WRITE setCollisionParticles NOTIFY collisionParticlesChanged)
    Q_PROPERTY(bool active READ active WRITE setActive NOTIFY activeChanged)
    Q_PROPERTY(bool onceOff READ onceOff WRITE setOnceOff NOTIFY onceOffChanged)
    Q_PROPERTY(QSGParticleExtruder* shape READ shape WRITE setShape NOTIFY shapeChanged)
    Q_PROPERTY(bool signal READ signal WRITE setSignal NOTIFY signalChanged)//TODO: Determine by whether it's connected

public:
    explicit QSGParticleAffector(QSGItem *parent = 0);
    virtual void affectSystem(qreal dt);
    virtual void reset(QSGParticleData*);//As some store their own data per particle?
    QSGParticleSystem* system() const
    {
        return m_system;
    }

    QStringList particles() const
    {
        return m_particles;
    }

    bool active() const
    {
        return m_active;
    }

    bool onceOff() const
    {
        return m_onceOff;
    }

    QSGParticleExtruder* shape() const
    {
        return m_shape;
    }

    bool signal() const
    {
        return m_signal;
    }

    QStringList collisionParticles() const
    {
        return m_collisionParticles;
    }

signals:

    void systemChanged(QSGParticleSystem* arg);

    void particlesChanged(QStringList arg);

    void activeChanged(bool arg);

    void onceOffChanged(bool arg);

    void shapeChanged(QSGParticleExtruder* arg);

    void affected(qreal x, qreal y);
    void signalChanged(bool arg);

    void collisionParticlesChanged(QStringList arg);

public slots:
void setSystem(QSGParticleSystem* arg)
{
    if (m_system != arg) {
        m_system = arg;
        m_system->registerParticleAffector(this);
        emit systemChanged(arg);
    }
}

void setParticles(QStringList arg)
{
    if (m_particles != arg) {
        m_particles = arg;
        m_updateIntSet = true;
        emit particlesChanged(arg);
    }
}

void setActive(bool arg)
{
    if (m_active != arg) {
        m_active = arg;
        emit activeChanged(arg);
    }
}

void setOnceOff(bool arg)
{
    if (m_onceOff != arg) {
        m_onceOff = arg;
        m_needsReset = true;
        emit onceOffChanged(arg);
    }
}

void setShape(QSGParticleExtruder* arg)
{
    if (m_shape != arg) {
        m_shape = arg;
        emit shapeChanged(arg);
    }
}

void setSignal(bool arg)
{
    if (m_signal != arg) {
        m_signal = arg;
        emit signalChanged(arg);
    }
}

void setCollisionParticles(QStringList arg)
{
    if (m_collisionParticles != arg) {
        m_collisionParticles = arg;
        emit collisionParticlesChanged(arg);
    }
}

protected:
    friend class QSGParticleSystem;
    virtual bool affectParticle(QSGParticleData *d, qreal dt);
    bool m_needsReset;//### What is this really saving?
    QSGParticleSystem* m_system;
    QStringList m_particles;
    bool activeGroup(int g) {return m_groups.isEmpty() || m_groups.contains(g);}
    bool m_active;
    virtual void componentComplete();
    QPointF m_offset;
private:
    QSet<int> m_groups;
    QSet<QPair<int, int> > m_onceOffed;
    bool m_updateIntSet;

    bool m_onceOff;

    QSGParticleExtruder* m_shape;

    bool m_signal;

    QStringList m_collisionParticles;

    bool isColliding(QSGParticleData* d);
private slots:
    void updateOffsets();
};

QT_END_NAMESPACE
QT_END_HEADER
#endif // PARTICLEAFFECTOR_H