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+/****************************************************************************
+**
+** 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKSPRITEENGINE_P_H
+#define QQUICKSPRITEENGINE_P_H
+
+#include <QObject>
+#include <QVector>
+#include <QTimer>
+#include <QTime>
+#include <QList>
+#include <QDeclarativeListProperty>
+#include <QImage>
+#include <QPair>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+class QQuickSprite;
+class Q_AUTOTEST_EXPORT QQuickStochasticState : public QObject //For internal use
+{
+    Q_OBJECT
+    Q_PROPERTY(int duration READ duration WRITE setDuration NOTIFY durationChanged)
+    Q_PROPERTY(int durationVariation READ durationVariance WRITE setDurationVariance NOTIFY durationVarianceChanged)
+    Q_PROPERTY(QVariantMap to READ to WRITE setTo NOTIFY toChanged)
+    Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged)
+    Q_PROPERTY(qreal speedModifiesDuration READ speedModifer WRITE setSpeedModifier NOTIFY speedModifierChanged)
+    Q_PROPERTY(int frames READ frames WRITE setFrames NOTIFY framesChanged)
+
+public:
+    QQuickStochasticState(QObject* parent = 0)
+        : QObject(parent)
+        , m_frames(1)
+        , m_duration(1000)
+    {
+    }
+
+    int duration() const
+    {
+        return m_duration;
+    }
+
+    QString name() const
+    {
+        return m_name;
+    }
+
+    QVariantMap to() const
+    {
+        return m_to;
+    }
+
+    qreal speedModifer() const
+    {
+        return m_speedModifier;
+    }
+
+    int durationVariance() const
+    {
+        return m_durationVariance;
+    }
+
+
+    int variedDuration() const
+    {
+        return m_duration
+                + (m_durationVariance * ((qreal)qrand()/RAND_MAX) * 2)
+                - m_durationVariance;
+    }
+
+    int frames() const
+    {
+        return m_frames;
+    }
+
+signals:
+    void durationChanged(int arg);
+
+    void nameChanged(QString arg);
+
+    void toChanged(QVariantMap arg);
+
+    void speedModifierChanged(qreal arg);
+
+    void durationVarianceChanged(int arg);
+
+    void entered();//### Just playing around - don't expect full state API
+    void framesChanged(int arg);
+
+public slots:
+    void setDuration(int arg)
+    {
+        if (m_duration != arg) {
+            m_duration = arg;
+            emit durationChanged(arg);
+        }
+    }
+
+    void setName(QString arg)
+    {
+        if (m_name != arg) {
+            m_name = arg;
+            emit nameChanged(arg);
+        }
+    }
+
+    void setTo(QVariantMap arg)
+    {
+        if (m_to != arg) {
+            m_to = arg;
+            emit toChanged(arg);
+        }
+    }
+
+    void setSpeedModifier(qreal arg)
+    {
+        if (m_speedModifier != arg) {
+            m_speedModifier = arg;
+            emit speedModifierChanged(arg);
+        }
+    }
+
+    void setDurationVariance(int arg)
+    {
+        if (m_durationVariance != arg) {
+            m_durationVariance = arg;
+            emit durationVarianceChanged(arg);
+        }
+    }
+
+    void setFrames(int arg)
+    {
+        if (m_frames != arg) {
+            m_frames = arg;
+            emit framesChanged(arg);
+        }
+    }
+
+private:
+    QString m_name;
+    int m_frames;
+    QVariantMap m_to;
+    int m_duration;
+    qreal m_speedModifier;
+    int m_durationVariance;
+
+    friend class QQuickStochasticEngine;
+};
+
+class Q_AUTOTEST_EXPORT QQuickStochasticEngine : public QObject
+{
+    Q_OBJECT
+    //TODO: Optimize single state case?
+    Q_PROPERTY(QString globalGoal READ globalGoal WRITE setGlobalGoal NOTIFY globalGoalChanged)
+    Q_PROPERTY(QDeclarativeListProperty<QQuickStochasticState> states READ states)
+public:
+    explicit QQuickStochasticEngine(QObject *parent = 0);
+    QQuickStochasticEngine(QList<QQuickStochasticState*> states, QObject *parent=0);
+    ~QQuickStochasticEngine();
+
+    QDeclarativeListProperty<QQuickStochasticState> states()
+    {
+        return QDeclarativeListProperty<QQuickStochasticState>(this, m_states);
+    }
+
+    QString globalGoal() const
+    {
+        return m_globalGoal;
+    }
+
+    int count() const {return m_things.count();}
+    void setCount(int c);
+
+    void setGoal(int state, int sprite=0, bool jump=false);
+    void start(int index=0, int state=0);
+    void stop(int index=0);
+    int curState(int index=0) {return m_things[index];}
+
+    QQuickStochasticState* state(int idx){return m_states[idx];}
+    int stateIndex(QQuickStochasticState* s){return m_states.indexOf(s);}
+    int stateIndex(const QString& s) {
+        for (int i=0; i<m_states.count(); i++)
+            if (m_states[i]->name() == s)
+                return i;
+        return -1;
+    }
+
+    int stateCount() {return m_states.count();}
+private:
+signals:
+
+    void globalGoalChanged(QString arg);
+    void stateChanged(int idx);
+
+public slots:
+    void setGlobalGoal(QString arg)
+    {
+        if (m_globalGoal != arg) {
+            m_globalGoal = arg;
+            emit globalGoalChanged(arg);
+        }
+    }
+
+    uint updateSprites(uint time);
+
+protected:
+    friend class QQuickParticleSystem;
+    void restart(int index);
+    void addToUpdateList(uint t, int idx);
+    int goalSeek(int curState, int idx, int dist=-1);
+    QList<QQuickStochasticState*> m_states;
+    //### Consider struct or class for the four data variables?
+    QVector<int> m_things;//int is the index in m_states of the current state
+    QVector<int> m_goals;
+    QVector<int> m_duration;
+    QVector<int> m_startTimes;
+    QList<QPair<uint, QList<int> > > m_stateUpdates;//### This could be done faster - priority queue?
+
+    QTime m_advanceTime;
+    uint m_timeOffset;
+    QString m_globalGoal;
+    int m_maxFrames;
+    int m_imageStateCount;
+};
+
+class QQuickSpriteEngine : public QQuickStochasticEngine
+{
+    Q_OBJECT
+    Q_PROPERTY(QDeclarativeListProperty<QQuickSprite> sprites READ sprites)
+public:
+    explicit QQuickSpriteEngine(QObject *parent = 0);
+    QQuickSpriteEngine(QList<QQuickSprite*> sprites, QObject *parent=0);
+    ~QQuickSpriteEngine();
+    QDeclarativeListProperty<QQuickSprite> sprites()
+    {
+        return QDeclarativeListProperty<QQuickSprite>(this, m_sprites);
+    }
+
+
+    int spriteState(int sprite=0);
+    int spriteStart(int sprite=0);
+    int spriteFrames(int sprite=0);
+    int spriteDuration(int sprite=0);
+    int spriteX(int /* sprite */ = 0) { return 0; }//Currently all rows are 0 aligned, if we get more space efficient we might change this
+    int spriteY(int sprite=0);
+    int spriteWidth(int sprite=0);
+    int spriteHeight(int sprite=0);
+    int spriteCount();//Like state count, but for the image states
+    int maxFrames();
+    QImage assembledImage();
+private:
+    QList<QQuickSprite*> m_sprites;
+};
+
+//Common use is to have your own list property which is transparently an engine
+inline void spriteAppend(QDeclarativeListProperty<QQuickSprite> *p, QQuickSprite* s)
+{
+    reinterpret_cast<QList<QQuickSprite *> *>(p->data)->append(s);
+    p->object->metaObject()->invokeMethod(p->object, "createEngine");
+}
+
+inline QQuickSprite* spriteAt(QDeclarativeListProperty<QQuickSprite> *p, int idx)
+{
+    return reinterpret_cast<QList<QQuickSprite *> *>(p->data)->at(idx);
+}
+
+inline void spriteClear(QDeclarativeListProperty<QQuickSprite> *p)
+{
+    reinterpret_cast<QList<QQuickSprite *> *>(p->data)->clear();
+    p->object->metaObject()->invokeMethod(p->object, "createEngine");
+}
+
+inline int spriteCount(QDeclarativeListProperty<QQuickSprite> *p)
+{
+    return reinterpret_cast<QList<QQuickSprite *> *>(p->data)->count();
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QQUICKSPRITEENGINE_P_H