/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Declarative module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qsgparticleaffector_p.h"
#include <QDebug>
QT_BEGIN_NAMESPACE
QSGParticleAffector::QSGParticleAffector(QSGItem *parent) :
    QSGItem(parent), m_needsReset(false), m_system(0), m_active(true)
  , m_updateIntSet(false), m_shape(new QSGParticleExtruder(this)), m_signal(false)
{
    connect(this, SIGNAL(systemChanged(QSGParticleSystem*)),
            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 QSGParticleAffector::componentComplete()
{
    if(!m_system && qobject_cast<QSGParticleSystem*>(parentItem()))
        setSystem(qobject_cast<QSGParticleSystem*>(parentItem()));
    if(!m_system)
        qWarning() << "Affector created without a particle system specified";//TODO: useful QML warnings, like line number?
    QSGItem::componentComplete();
}

void QSGParticleAffector::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++){
        QSGParticleData* 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)){
            //Need to have previous location for affected. if signal || shape might be faster?
            QPointF curPos = QPointF(d->curX(), d->curY());
            if(width() == 0 || height() == 0
                    || m_shape->contains(QRectF(m_offset.x(), m_offset.y(), width(), height()),curPos)){
                if(affectParticle(d, dt)){
                    m_system->m_needsReset << d;
                    if(m_onceOff)
                        m_onceOffed << d->systemIndex;
                    if(m_signal)
                        emit affected(curPos.x(), curPos.y());
                }
            }
        }
    }
}

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

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

QT_END_NAMESPACE