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#include "particleaffector.h"
#include <QDebug>
QT_BEGIN_NAMESPACE
ParticleAffector::ParticleAffector(QSGItem *parent) :
    QSGItem(parent), m_needsReset(false), m_system(0), m_active(true), m_updateIntSet(false)
{
    connect(this, SIGNAL(systemChanged(ParticleSystem*)),
            this, SLOT(updateOffsets()));
    connect(this, SIGNAL(xChanged()),
            this, SLOT(updateOffsets()));
    connect(this, SIGNAL(yChanged()),
            this, SLOT(updateOffsets()));//TODO: in componentComplete and all relevant signals
}

void ParticleAffector::componentComplete()
{
    if(!m_system)
        qWarning() << "Affector created without a particle system specified";//TODO: useful QML warnings, like line number?
    QSGItem::componentComplete();
}

void ParticleAffector::affectSystem(qreal dt)
{
    if(!m_active)
        return;
    if(!m_system){
        qDebug() << "No system" << this;
        return;
    }
    //If not reimplemented, calls affect particle per particle
    //But only on particles in targeted system/area
    if(m_updateIntSet){
        m_groups.clear();
        foreach(const QString &p, m_particles)
            m_groups << m_system->m_groupIds[p];//###Can this occur before group ids are properly assigned?
        m_updateIntSet = false;
    }
    //foreach(ParticleData* d, m_system->m_data){
    for(int i=0; i<m_system->m_particle_count; i++){
        ParticleData* d = m_system->m_data[i];
        if(!d || (m_onceOff && m_onceOffed.contains(d->systemIndex)))
            continue;
        if(m_groups.isEmpty() || m_groups.contains(d->group)){
            if(width() == 0 || height() == 0 || QRectF(m_offset.x(), m_offset.y(), width(), height()).contains(d->curX(), d->curY())){
                if(affectParticle(d, dt)){
                    m_system->m_needsReset << d;
                    if(m_onceOff)
                        m_onceOffed << d->systemIndex;
                }
            }
        }
    }
}

bool ParticleAffector::affectParticle(ParticleData *d, qreal dt)
{
    Q_UNUSED(d);
    Q_UNUSED(dt);
    return false;
}

void ParticleAffector::reset(int idx)
{//TODO: This, among other ones, should be restructured so they don't all need to remember to call the superclass
    if(m_onceOff)
        m_onceOffed.remove(idx);
}

void ParticleAffector::updateOffsets()
{
    if(m_system)
        m_offset = m_system->mapFromItem(this, QPointF(0, 0));
}

QT_END_NAMESPACE