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#include "cloud.h"

#include "bearercloud.h"

#include <qnetworksession.h>

#include <QGraphicsTextItem>

#include <QGraphicsSvgItem>

#include <QGraphicsSceneMouseEvent>

#include <QSvgRenderer>

#include <QPainter>

#include <QDebug>

#include <math.h>

static QMap<QString, QSvgRenderer *> svgCache;

//! [0]

Cloud::Cloud(const QNetworkConfiguration &config, QGraphicsItem *parent)

:   QGraphicsItem(parent), configuration(config), deleteAfterAnimation(false)

{

    session = new QNetworkSession(configuration, this);

    connect(session, SIGNAL(newConfigurationActivated()),

            this, SLOT(newConfigurationActivated()));

    connect(session, SIGNAL(stateChanged(QNetworkSession::State)),

            this, SLOT(stateChanged(QNetworkSession::State)));

    setFlag(ItemIsMovable);

#if (QT_VERSION >= QT_VERSION_CHECK(4, 6, 0))

    setFlag(ItemSendsGeometryChanges);

#endif

    setZValue(1);

    icon = new QGraphicsSvgItem(this);

    text = new QGraphicsTextItem(this);

    currentScale = 0;

    finalScale = 1;

    setTransform(QTransform::fromScale(currentScale, currentScale), false);

    setOpacity(0);

    newConfigurationActivated();

}

//! [0]

Cloud::~Cloud()

{

}

void Cloud::setFinalScale(qreal factor)

{

    finalScale = factor;

}

void Cloud::setDeleteAfterAnimation(bool deleteAfter)

{

    deleteAfterAnimation = deleteAfter;

}

void Cloud::calculateForces()

{

    if (!scene() || scene()->mouseGrabberItem() == this) {

        newPos = pos();

        return;

    }

    // sum up all the forces push this item away

    qreal xvel = 0;

    qreal yvel = 0;

    QLineF orbitForce;

    foreach (QGraphicsItem *item, scene()->items()) {

        // other clouds

        Cloud *cloud = qgraphicsitem_cast<Cloud *>(item);

        if (!cloud && item->data(0) != QLatin1String("This Device"))

            continue;

        qreal factor = 1.0;

        QLineF line(cloud ? item->mapToScene(0, 0) : QPointF(0, 0), mapToScene(0, 0));

        if (item->data(0) == QLatin1String("This Device"))

            orbitForce = line;

        if (cloud)

            factor = cloud->currentScale;

        qreal dx = line.dx();

        qreal dy = line.dy();

        double l = 2.0 * (dx * dx + dy * dy);

        if (l > 0) {

            xvel += factor * dx * 200.0 / l;

            yvel += factor * dy * 200.0 / l;

        }

    }

    // tendency to stay at a fixed orbit

    qreal orbit = getRadiusForState(configuration.state());

    qreal distance = orbitForce.length();

    QLineF unit = orbitForce.unitVector();

    orbitForce.setLength(xvel * unit.dx() + yvel * unit.dy());

    qreal w = 2 - exp(-pow(distance-orbit, 2)/(2 * 50));

    if (distance < orbit) {

        xvel += orbitForce.dx() * w;

        yvel += orbitForce.dy() * w;

    } else {

        xvel -= orbitForce.dx() * w;

        yvel -= orbitForce.dy() * w;

    }

    if (qAbs(xvel) < 0.1 && qAbs(yvel) < 0.1)

        xvel = yvel = 0;

    QRectF sceneRect = scene()->sceneRect();

    newPos = pos() + QPointF(xvel, yvel);

    newPos.setX(qMin(qMax(newPos.x(), sceneRect.left() + 10), sceneRect.right() - 10));

    newPos.setY(qMin(qMax(newPos.y(), sceneRect.top() + 10), sceneRect.bottom() - 10));

}

bool Cloud::advance()

{

    static const qreal scaleDelta = 0.01;

    bool animated = false;

    if (currentScale < finalScale) {

        animated = true;

        currentScale = qMin<qreal>(currentScale + scaleDelta, finalScale);

        setTransform(QTransform::fromScale(currentScale, currentScale), false);

    } else if (currentScale > finalScale) {

        animated = true;

        currentScale = qMax<qreal>(currentScale - scaleDelta, finalScale);

        setTransform(QTransform::fromScale(currentScale, currentScale), false);

    }

    if (newPos != pos()) {

        setPos(newPos);

        animated = true;

    }

    if (opacity() != finalOpacity) {

        animated = true;

        if (qAbs(finalScale - currentScale) > 0.0) {

            // use scale as reference

            setOpacity(opacity() + scaleDelta * (finalOpacity - opacity()) /

                       qAbs(finalScale - currentScale));

        } else {

            setOpacity(finalOpacity);

        }

    }

    if (!animated && deleteAfterAnimation)

        deleteLater();

    return animated;

}

QRectF Cloud::boundingRect() const

{

    return childrenBoundingRect();

}

void Cloud::paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *)

{

}

//! [4]

QVariant Cloud::itemChange(GraphicsItemChange change, const QVariant &value)

{

    switch (change) {

    case ItemPositionHasChanged:

        if (BearerCloud *bearercloud = qobject_cast<BearerCloud *>(scene()))

            bearercloud->cloudMoved();

    default:

        ;

    };

    return QGraphicsItem::itemChange(change, value);

}

//! [4]

//! [3]

void Cloud::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)

{

    if (event->button() == Qt::LeftButton) {

        if (session->isOpen())

            session->close();

        else

            session->open();

        event->accept();

    }

}

//! [3]

//! [2]

void Cloud::stateChanged(QNetworkSession::State state)

{

    if (configuration.name().isEmpty())

        finalOpacity = qreal(0.1);

    else if (session->state() == QNetworkSession::NotAvailable)

        finalOpacity = 0.5;

    else

        finalOpacity = 1.0;

    QString tooltip;

    if (configuration.name().isEmpty())

        tooltip += tr("<b>HIDDEN NETWORK</b><br>");

    else

        tooltip += tr("<b>%1</b><br>").arg(configuration.name());

    const QNetworkInterface interface = session->interface();

    if (interface.isValid())

        tooltip += tr("<br>Interface: %1").arg(interface.humanReadableName());

    tooltip += tr("<br>Id: %1").arg(configuration.identifier());

    const QString bearerName = configuration.bearerName();

    if (!bearerName.isEmpty())

        tooltip += tr("<br>Bearer: %1").arg(bearerName);

    QString s = tr("<br>State: %1 (%2)");

    switch (state) {

    case QNetworkSession::Invalid:

        s = s.arg(tr("Invalid"));

        break;

    case QNetworkSession::NotAvailable:

        s = s.arg(tr("Not Available"));

        break;

    case QNetworkSession::Connecting:

        s = s.arg(tr("Connecting"));

        break;

    case QNetworkSession::Connected:

        s = s.arg(tr("Connected"));

        break;

    case QNetworkSession::Closing:

        s = s.arg(tr("Closing"));

        break;

    case QNetworkSession::Disconnected:

        s = s.arg(tr("Disconnected"));

        break;

    case QNetworkSession::Roaming:

        s = s.arg(tr("Roaming"));

        break;

    default:

        s = s.arg(tr("Unknown"));

    }

    if (session->isOpen())

        s = s.arg(tr("Open"));

    else

        s = s.arg(tr("Closed"));

    tooltip += s;

    tooltip += tr("<br><br>Active time: %1 seconds").arg(session->activeTime());

    tooltip += tr("<br>Received data: %1 bytes").arg(session->bytesReceived());

    tooltip += tr("<br>Sent data: %1 bytes").arg(session->bytesWritten());

    setToolTip(tooltip);

}

//! [2]

//! [1]

void Cloud::newConfigurationActivated()

{

    const QString bearerName = configuration.bearerName();

    if (!svgCache.contains(bearerName)) {

        if (bearerName == QLatin1String("WLAN"))

            svgCache.insert(bearerName, new QSvgRenderer(QLatin1String(":wlan.svg")));

        else if (bearerName == QLatin1String("Ethernet"))

            svgCache.insert(bearerName, new QSvgRenderer(QLatin1String(":lan.svg")));

        else

            svgCache.insert(bearerName, new QSvgRenderer(QLatin1String(":unknown.svg")));

    }

    icon->setSharedRenderer(svgCache[bearerName]);

    if (configuration.name().isEmpty()) {

        text->setPlainText(tr("HIDDEN NETWORK"));

    } else {

        if (configuration.type() == QNetworkConfiguration::ServiceNetwork)

            text->setHtml("<b>" + configuration.name() + "</b>");

        else

            text->setPlainText(configuration.name());

    }

    const qreal height = icon->boundingRect().height() + text->boundingRect().height();

    icon->setPos(icon->boundingRect().width() / -2, height / -2);

    text->setPos(text->boundingRect().width() / -2,

                 height / 2 - text->boundingRect().height());

    stateChanged(session->state());

}

//! [1]

qreal Cloud::getRadiusForState(QNetworkConfiguration::StateFlags state)

{

    switch (state) {

    case QNetworkConfiguration::Active:

        return 100;

        break;

    case QNetworkConfiguration::Discovered:

        return 150;

        break;

    case QNetworkConfiguration::Defined:

        return 200;

        break;

    case QNetworkConfiguration::Undefined:

        return 250;

        break;

    default:

        return 300;

    }

}