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//Own

#include "torpedo.h"

#include "pixmapitem.h"

#include "boat.h"

#include "graphicsscene.h"

#include "animationmanager.h"

#include "qanimationstate.h"

#include <QtCore/QPropertyAnimation>

#include <QtCore/QStateMachine>

#include <QtCore/QFinalState>

Torpedo::Torpedo() : PixmapItem(QString::fromLatin1("torpedo"),GraphicsScene::Big),

    currentSpeed(0)

{

    setZValue(2);

}

void Torpedo::launch()

{

    QPropertyAnimation *launchAnimation = new QPropertyAnimation(this, "pos");

    AnimationManager::self()->registerAnimation(launchAnimation);

    launchAnimation->setEndValue(QPointF(x(),qobject_cast<GraphicsScene *>(scene())->sealLevel() - 15));

    launchAnimation->setEasingCurve(QEasingCurve::InQuad);

    launchAnimation->setDuration(y()/currentSpeed*10);

    connect(launchAnimation,SIGNAL(valueChanged(QVariant)),this,SLOT(onAnimationLaunchValueChanged(QVariant)));

    connect(this,SIGNAL(torpedoExploded()), launchAnimation, SLOT(stop()));

    //We setup the state machine of the torpedo

    QStateMachine *machine = new QStateMachine(this);

    //This state is when the launch animation is playing

    QAnimationState *launched = new QAnimationState(machine);

    launched->setAnimation(launchAnimation);

    //End

    QFinalState *final = new QFinalState(machine);

    machine->setInitialState(launched);

    //### Add a nice animation when the torpedo is destroyed

    launched->addTransition(this, SIGNAL(torpedoExploded()),final);

    //If the animation is finished, then we move to the final state

    launched->addTransition(launched, SIGNAL(animationFinished()), final);

    //The machine has finished to be executed, then the boat is dead

    connect(machine,SIGNAL(finished()),this, SIGNAL(torpedoExecutionFinished()));

    machine->start();

}

void Torpedo::setCurrentSpeed(int speed)

{

    if (speed < 0) {

        qWarning("Torpedo::setCurrentSpeed : The speed is invalid");

        return;

    }

    currentSpeed = speed;

}

void Torpedo::onAnimationLaunchValueChanged(const QVariant &)

{

    foreach (QGraphicsItem *item , collidingItems(Qt::IntersectsItemBoundingRect)) {

        if (Boat *b = qgraphicsitem_cast<Boat*>(item))

            b->destroy();

    }

}

void Torpedo::destroy()

{

    emit torpedoExploded();

}