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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(QGraphicsItem * parent, Qt::WindowFlags wFlags)
    : QGraphicsWidget(parent,wFlags), currentSpeed(0), launchAnimation(0)
{
    pixmapItem = new PixmapItem(QString::fromLatin1("torpedo"),GraphicsScene::Big, this);
    setZValue(2);
    setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    setFlags(QGraphicsItem::ItemIsMovable);
    resize(pixmapItem->boundingRect().size());
}

void Torpedo::launch()
{
    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(const QVariant &)),this,SLOT(onAnimationLaunchValueChanged(const QVariant &)));

    //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->rootState());
    launched->setAnimation(launchAnimation);

    //End
    QFinalState *final = new QFinalState(machine->rootState());

    machine->setInitialState(launched);

    //### Add a nice animation when the torpedo is destroyed
    launched->addTransition(this, SIGNAL(torpedoExplosed()),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 (item->type() == Boat::Type) {
            Boat *b = static_cast<Boat *>(item);
            b->destroy();
        }
    }
}

void Torpedo::destroy()
{
    launchAnimation->stop();
    emit torpedoExplosed();
}