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//Own
#include "submarine.h"
#include "submarine_p.h"
#include "torpedo.h"
#include "pixmapitem.h"
#include "graphicsscene.h"
#include "animationmanager.h"
#include "custompropertyanimation.h"
#include "qanimationstate.h"

#include <QtCore/QPropertyAnimation>
#include <QtCore/QStateMachine>
#include <QtCore/QFinalState>
#include <QtCore/QSequentialAnimationGroup>

static QAbstractAnimation *setupDestroyAnimation(SubMarine *sub)
{
    QSequentialAnimationGroup *group = new QSequentialAnimationGroup(sub);
#if QT_VERSION >=0x040500
    PixmapItem *step1 = new PixmapItem(QString("explosion/submarine/step1"),GraphicsScene::Big, sub);
    step1->setZValue(6);
    PixmapItem *step2 = new PixmapItem(QString("explosion/submarine/step2"),GraphicsScene::Big, sub);
    step2->setZValue(6);
    PixmapItem *step3 = new PixmapItem(QString("explosion/submarine/step3"),GraphicsScene::Big, sub);
    step3->setZValue(6);
    PixmapItem *step4 = new PixmapItem(QString("explosion/submarine/step4"),GraphicsScene::Big, sub);
    step4->setZValue(6);
    step1->setOpacity(0);
    step2->setOpacity(0);
    step3->setOpacity(0);
    step4->setOpacity(0);
    CustomPropertyAnimation *anim1 = new CustomPropertyAnimation(sub);
    anim1->setMemberFunctions((QGraphicsItem*)step1, &QGraphicsItem::opacity, &QGraphicsItem::setOpacity);
    anim1->setDuration(100);
    anim1->setEndValue(1);
    CustomPropertyAnimation *anim2 = new CustomPropertyAnimation(sub);
    anim2->setMemberFunctions((QGraphicsItem*)step2, &QGraphicsItem::opacity, &QGraphicsItem::setOpacity);
    anim2->setDuration(100);
    anim2->setEndValue(1);
    CustomPropertyAnimation *anim3 = new CustomPropertyAnimation(sub);
    anim3->setMemberFunctions((QGraphicsItem*)step3, &QGraphicsItem::opacity, &QGraphicsItem::setOpacity);
    anim3->setDuration(100);
    anim3->setEndValue(1);
    CustomPropertyAnimation *anim4 = new CustomPropertyAnimation(sub);
    anim4->setMemberFunctions((QGraphicsItem*)step4, &QGraphicsItem::opacity, &QGraphicsItem::setOpacity);
    anim4->setDuration(100);
    anim4->setEndValue(1);
    group->addAnimation(anim1);
    group->addAnimation(anim2);
    group->addAnimation(anim3);
    group->addAnimation(anim4);
#else
    // work around for a bug where we don't transition if the duration is zero.
    QtPauseAnimation *anim = new QtPauseAnimation(group);
    anim->setDuration(1);
    group->addAnimation(anim);
#endif
    AnimationManager::self()->registerAnimation(group);
    return group;
}


SubMarine::SubMarine(int type, const QString &name, int points, QGraphicsItem * parent, Qt::WindowFlags wFlags)
    : QGraphicsWidget(parent,wFlags), subType(type), subName(name), subPoints(points), speed(0), direction(SubMarine::None)
{
    pixmapItem = new PixmapItem(QString("submarine"),GraphicsScene::Big, this);
    setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    setZValue(5);
    setFlags(QGraphicsItem::ItemIsMovable);
    resize(pixmapItem->boundingRect().width(),pixmapItem->boundingRect().height());
    setTransformOrigin(boundingRect().center());

    //We setup the state machine of the submarine
    QStateMachine *machine = new QStateMachine(this);

    //This state is when the boat is moving/rotating
    QState *moving = new QState(machine);

    //This state is when the boat is moving from left to right
    MovementState *movement = new MovementState(this, moving);

    //This state is when the boat is moving from left to right
    ReturnState *rotation = new ReturnState(this, moving);

    //This is the initial state of the moving root state
    moving->setInitialState(movement);

    movement->addTransition(this, SIGNAL(subMarineStateChanged()), moving);

    //This is the initial state of the machine
    machine->setInitialState(moving);

    //End
    QFinalState *final = new QFinalState(machine);

    //If the moving animation is finished we move to the return state
    movement->addTransition(movement, SIGNAL(animationFinished()), rotation);

    //If the return animation is finished we move to the moving state
    rotation->addTransition(rotation, SIGNAL(animationFinished()), movement);

    //This state play the destroyed animation
    QAnimationState *destroyedState = new QAnimationState(machine);
    destroyedState->setAnimation(setupDestroyAnimation(this));

    //Play a nice animation when the submarine is destroyed
    moving->addTransition(this, SIGNAL(subMarineDestroyed()), destroyedState);

    //Transition to final state when the destroyed animation is finished
    destroyedState->addTransition(destroyedState, SIGNAL(animationFinished()), final);

    //The machine has finished to be executed, then the submarine is dead
    connect(machine,SIGNAL(finished()),this, SIGNAL(subMarineExecutionFinished()));

    machine->start();
}

int SubMarine::points()
{
    return subPoints;
}

void SubMarine::setCurrentDirection(SubMarine::Movement direction)
{
    if (this->direction == direction)
        return;
    if (direction == SubMarine::Right && this->direction == SubMarine::None) {
          setYRotation(180);
    }
    this->direction = direction;
}

enum SubMarine::Movement SubMarine::currentDirection() const
{
    return direction;
}

void SubMarine::setCurrentSpeed(int speed)
{
    if (speed < 0 || speed > 3) {
        qWarning("SubMarine::setCurrentSpeed : The speed is invalid");
    }
    this->speed = speed;
    emit subMarineStateChanged();
}

int SubMarine::currentSpeed() const
{
    return speed;
}

void SubMarine::launchTorpedo(int speed)
{
    Torpedo * torp = new Torpedo();
    GraphicsScene *scene = static_cast<GraphicsScene *>(this->scene());
    scene->addItem(torp);
    torp->setPos(x(), y());
    torp->setCurrentSpeed(speed);
    torp->launch();
}

void SubMarine::destroy()
{
    emit subMarineDestroyed();
}

int SubMarine::type() const
{
    return Type;
}