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#include "lifecycle.h"

#include "stickman.h"

#include "node.h"

#include "animation.h"

#include "graphicsview.h"

#include <QtCore>

#include <QtGui>

class KeyPressTransition: public QSignalTransition

{

public:

    KeyPressTransition(GraphicsView *receiver, Qt::Key key)

        : QSignalTransition(receiver, SIGNAL(keyPressed(int))), m_key(key)

    {

    }

    KeyPressTransition(GraphicsView *receiver, Qt::Key key, QAbstractState *target)

        : QSignalTransition(receiver, SIGNAL(keyPressed(int))), m_key(key)

    {

        setTargetState(target);

    }

    virtual bool eventTest(QEvent *e)

    {

        if (QSignalTransition::eventTest(e)) {

            QVariant key = static_cast<QStateMachine::SignalEvent*>(e)->arguments().at(0);

            return (key.toInt() == int(m_key));

        } 

        return false;

    }

private:

    Qt::Key m_key;

};

//! [4]

class LightningStrikesTransition: public QEventTransition

{

public:

    LightningStrikesTransition(QAbstractState *target)

        : QEventTransition(this, QEvent::Timer)

    {

        setTargetState(target);

        qsrand((uint)QDateTime::currentDateTime().toTime_t());

        startTimer(1000);

    }

    virtual bool eventTest(QEvent *e)

    {

        return QEventTransition::eventTest(e) && ((qrand() % 50) == 0);

    }

};

//! [4]

LifeCycle::LifeCycle(StickMan *stickMan, GraphicsView *keyReceiver)

    : m_stickMan(stickMan), m_keyReceiver(keyReceiver)

{

    // Create animation group to be used for all transitions

    m_animationGroup = new QParallelAnimationGroup();

    const int stickManNodeCount = m_stickMan->nodeCount();

    for (int i=0; i<stickManNodeCount; ++i) {

        QPropertyAnimation *pa = new QPropertyAnimation(m_stickMan->node(i), "pos");

        m_animationGroup->addAnimation(pa);    

    }

    // Set up intial state graph

//! [3]

    m_machine = new QStateMachine();

    m_machine->addDefaultAnimation(m_animationGroup);

//! [3]

    m_alive = new QState(m_machine);

    m_alive->setObjectName("alive");

    // Make it blink when lightning strikes before entering dead animation

    QState *lightningBlink = new QState(m_machine);    

    lightningBlink->assignProperty(m_stickMan->scene(), "backgroundBrush", Qt::white);

    lightningBlink->assignProperty(m_stickMan, "penColor", Qt::black);

    lightningBlink->assignProperty(m_stickMan, "fillColor", Qt::white);

    lightningBlink->assignProperty(m_stickMan, "isDead", true);

//! [5]

    QTimer *timer = new QTimer(lightningBlink);

    timer->setSingleShot(true);

    timer->setInterval(100);

    QObject::connect(lightningBlink, SIGNAL(entered()), timer, SLOT(start()));

    QObject::connect(lightningBlink, SIGNAL(exited()), timer, SLOT(stop()));

//! [5]

    m_dead = new QState(m_machine);

    m_dead->assignProperty(m_stickMan->scene(), "backgroundBrush", Qt::black);

    m_dead->assignProperty(m_stickMan, "penColor", Qt::white);

    m_dead->assignProperty(m_stickMan, "fillColor", Qt::black);

    m_dead->setObjectName("dead");

    // Idle state (sets no properties)

    m_idle = new QState(m_alive);

    m_idle->setObjectName("idle");

    m_alive->setInitialState(m_idle);

    // Lightning strikes at random

    m_alive->addTransition(new LightningStrikesTransition(lightningBlink));

//! [0]

    lightningBlink->addTransition(timer, SIGNAL(timeout()), m_dead);

//! [0]

    m_machine->setInitialState(m_alive);

}

void LifeCycle::setDeathAnimation(const QString &fileName)

{

    QState *deathAnimation = makeState(m_dead, fileName);

    m_dead->setInitialState(deathAnimation);

}

void LifeCycle::start()

{

    m_machine->start();

}

void LifeCycle::addActivity(const QString &fileName, Qt::Key key)

{

    QState *state = makeState(m_alive, fileName);

    m_alive->addTransition(new KeyPressTransition(m_keyReceiver, key, state));

}

QState *LifeCycle::makeState(QState *parentState, const QString &animationFileName)

{

    QState *topLevel = new QState(parentState);

    Animation animation;

    {

        QFile file(animationFileName);

        if (file.open(QIODevice::ReadOnly))

            animation.load(&file);

    }

    const int frameCount = animation.totalFrames();

    QState *previousState = 0;

    for (int i=0; i<frameCount; ++i) {

        animation.setCurrentFrame(i);

//! [1]

        QState *frameState = new QState(topLevel);                       

        const int nodeCount = animation.nodeCount();

        for (int j=0; j<nodeCount; ++j)

            frameState->assignProperty(m_stickMan->node(j), "pos", animation.nodePos(j));

//! [1]

        frameState->setObjectName(QString::fromLatin1("frame %0").arg(i));

        if (previousState == 0)

            topLevel->setInitialState(frameState);

        else

//! [2]

            previousState->addTransition(previousState, SIGNAL(propertiesAssigned()), frameState);

//! [2]

        previousState = frameState;

    }

    // Loop

    previousState->addTransition(previousState, SIGNAL(propertiesAssigned()), topLevel->initialState());

    return topLevel;

}

LifeCycle::~LifeCycle()

{

    delete m_machine;

    delete m_animationGroup;

}