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#include "bearercloud.h"
#include "cloud.h"

#include <QGraphicsTextItem>
#include <QTimer>
#include <QHostInfo>
#include <QRandomGenerator>

#include <QDebug>

#include <qmath.h>

//! [0]
BearerCloud::BearerCloud(QObject *parent)
:   QGraphicsScene(parent), timerId(0)
{
    setSceneRect(-300, -300, 600, 600);


    offset[QNetworkConfiguration::Active] = QRandomGenerator::bounded(2 * M_PI);
    offset[QNetworkConfiguration::Discovered] = offset[QNetworkConfiguration::Active] + M_PI / 6;
    offset[QNetworkConfiguration::Defined] = offset[QNetworkConfiguration::Discovered] - M_PI / 6;
    offset[QNetworkConfiguration::Undefined] = offset[QNetworkConfiguration::Undefined] + M_PI / 6;

    thisDevice = new QGraphicsTextItem(QHostInfo::localHostName());
    thisDevice->setData(0, QLatin1String("This Device"));
    thisDevice->setPos(thisDevice->boundingRect().width() / -2,
                       thisDevice->boundingRect().height() / -2);
    addItem(thisDevice);

    qreal radius = Cloud::getRadiusForState(QNetworkConfiguration::Active);
    QGraphicsEllipseItem *orbit = new QGraphicsEllipseItem(-radius, -radius, 2*radius, 2*radius);
    orbit->setPen(QColor(Qt::green));
    addItem(orbit);
    radius = Cloud::getRadiusForState(QNetworkConfiguration::Discovered);
    orbit = new QGraphicsEllipseItem(-radius, -radius, 2*radius, 2*radius);
    orbit->setPen(QColor(Qt::blue));
    addItem(orbit);
    radius = Cloud::getRadiusForState(QNetworkConfiguration::Defined);
    orbit = new QGraphicsEllipseItem(-radius, -radius, 2*radius, 2*radius);
    orbit->setPen(QColor(Qt::darkGray));
    addItem(orbit);
    radius = Cloud::getRadiusForState(QNetworkConfiguration::Undefined);
    orbit = new QGraphicsEllipseItem(-radius, -radius, 2*radius, 2*radius);
    orbit->setPen(QColor(Qt::lightGray));
    addItem(orbit);

    connect(&manager, SIGNAL(configurationAdded(QNetworkConfiguration)),
            this, SLOT(configurationAdded(QNetworkConfiguration)));
    connect(&manager, SIGNAL(configurationRemoved(QNetworkConfiguration)),
            this, SLOT(configurationRemoved(QNetworkConfiguration)));
    connect(&manager, SIGNAL(configurationChanged(QNetworkConfiguration)),
            this, SLOT(configurationChanged(QNetworkConfiguration)));

    QTimer::singleShot(0, this, SLOT(updateConfigurations()));
}
//! [0]

BearerCloud::~BearerCloud()
{
}

void BearerCloud::cloudMoved()
{
    if (!timerId)
        timerId = startTimer(1000 / 25);
}

void BearerCloud::timerEvent(QTimerEvent *)
{
    std::vector<Cloud *> clouds;
    const auto graphicsItems = items();
    clouds.reserve(graphicsItems.size());
    for (QGraphicsItem *item : graphicsItems) {
        if (Cloud *cloud = qgraphicsitem_cast<Cloud *>(item))
            clouds.push_back(cloud);
    }

    for (Cloud *cloud : clouds)
        cloud->calculateForces();

    bool cloudsMoved = false;
    for (Cloud *cloud : clouds)
        cloudsMoved |= cloud->advance();

    if (!cloudsMoved) {
        killTimer(timerId);
        timerId = 0;
    }
}

//! [2]
void BearerCloud::configurationAdded(const QNetworkConfiguration &config)
{
    const QNetworkConfiguration::StateFlags state = config.state();

    configStates.insert(state, config.identifier());

    const qreal radius = Cloud::getRadiusForState(state);
    const int count = configStates.count(state);
    const qreal angle = 2 * M_PI / count;

    Cloud *item = new Cloud(config);
    configurations.insert(config.identifier(), item);

    item->setPos(radius * cos((count-1) * angle + offset[state]),
                 radius * sin((count-1) * angle + offset[state]));

    addItem(item);

    cloudMoved();
}
//! [2]

//! [3]
void BearerCloud::configurationRemoved(const QNetworkConfiguration &config)
{
    const auto id = config.identifier();
    for (auto it = configStates.begin(), end = configStates.end(); it != end; /* erasing */) {
        if (it.value() == id)
            it = configStates.erase(it);
        else
            ++it;
    }

    Cloud *item = configurations.take(config.identifier());

    item->setFinalScale(0.0);
    item->setDeleteAfterAnimation(true);

    cloudMoved();
}
//! [3]

//! [4]
void BearerCloud::configurationChanged(const QNetworkConfiguration &config)
{
    const auto id = config.identifier();
    for (auto it = configStates.begin(), end = configStates.end(); it != end; /* erasing */) {
        if (it.value() == id)
            it = configStates.erase(it);
        else
            ++it;
    }

    configStates.insert(config.state(), id);

    cloudMoved();
}
//! [4]

//! [1]
void BearerCloud::updateConfigurations()
{
    const auto allConfigurations = manager.allConfigurations();
    for (const QNetworkConfiguration &config : allConfigurations)
        configurationAdded(config);

    cloudMoved();
}
//! [1]