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#include "communicationstarter.h"

#include "bluetoothlistener.h"

#include "trkdevice.h"

#include <QtCore/QTimer>

#include <QtCore/QEventLoop>

namespace trk {

// --------------- AbstractBluetoothStarter

struct BaseCommunicationStarterPrivate {

    explicit BaseCommunicationStarterPrivate(const BaseCommunicationStarter::TrkDevicePtr &d);

    const BaseCommunicationStarter::TrkDevicePtr trkDevice;

    BluetoothListener *listener;

    QTimer *timer;

    int intervalMS;

    int attempts;

    int n;

    QString errorString;

    BaseCommunicationStarter::State state;

};

BaseCommunicationStarterPrivate::BaseCommunicationStarterPrivate(const BaseCommunicationStarter::TrkDevicePtr &d) :

        trkDevice(d),

        listener(0),

        timer(0),

        intervalMS(1000),

        attempts(-1),

        n(0),

        state(BaseCommunicationStarter::TimedOut)

{

}

BaseCommunicationStarter::BaseCommunicationStarter(const TrkDevicePtr &trkDevice, QObject *parent) :

        QObject(parent),

        d(new BaseCommunicationStarterPrivate(trkDevice))

{

}

BaseCommunicationStarter::~BaseCommunicationStarter()

{

    stopTimer();

    delete d;

}

void BaseCommunicationStarter::stopTimer()

{

    if (d->timer && d->timer->isActive())

        d->timer->stop();

}

bool BaseCommunicationStarter::initializeStartupResources(QString *errorMessage)

{

    errorMessage->clear();

    return true;

}

BaseCommunicationStarter::StartResult BaseCommunicationStarter::start()

{

    if (state() == Running) {

        d->errorString = QLatin1String("Internal error, attempt to re-start BaseCommunicationStarter.\n");

        return StartError;

    }

    // Before we instantiate timers, and such, try to open the device,

    // which should succeed if another listener is already running in

    // 'Watch' mode

    if (d->trkDevice->open(&(d->errorString)))

        return ConnectionSucceeded;

    // Pull up resources for next attempt

    d->n = 0;

    if (!initializeStartupResources(&(d->errorString)))

        return StartError;

    // Start timer

    if (!d->timer) {

        d->timer = new QTimer;

        connect(d->timer, SIGNAL(timeout()), this, SLOT(slotTimer()));

    }

    d->timer->setInterval(d->intervalMS);

    d->timer->setSingleShot(false);

    d->timer->start();

    d->state = Running;

    return Started;

}

BaseCommunicationStarter::State BaseCommunicationStarter::state() const

{

    return d->state;

}

int BaseCommunicationStarter::intervalMS() const

{

    return d->intervalMS;

}

void BaseCommunicationStarter::setIntervalMS(int i)

{

    d->intervalMS = i;

    if (d->timer)

        d->timer->setInterval(i);

}

int BaseCommunicationStarter::attempts() const

{

    return d->attempts;

}

void BaseCommunicationStarter::setAttempts(int a)

{

    d->attempts = a;

}

QString BaseCommunicationStarter::device() const

{

    return d->trkDevice->port();

}

QString BaseCommunicationStarter::errorString() const

{

    return d->errorString;

}

void BaseCommunicationStarter::slotTimer()

{

    ++d->n;

    // Check for timeout

    if (d->attempts >= 0 && d->n >= d->attempts) {

        stopTimer();

        d->errorString = tr("%1: timed out after %n attempts using an interval of %2ms.", 0, d->n)

                         .arg(d->trkDevice->port()).arg(d->intervalMS);

        d->state = TimedOut;

        emit timeout();

    } else {

        // Attempt n to connect?

        if (d->trkDevice->open(&(d->errorString))) {

            stopTimer();

            const QString msg = tr("%1: Connection attempt %2 succeeded.").arg(d->trkDevice->port()).arg(d->n);

            emit message(msg);

            d->state = Connected;

            emit connected();

        } else {

            const QString msg = tr("%1: Connection attempt %2 failed: %3 (retrying)...")

                                .arg(d->trkDevice->port()).arg(d->n).arg(d->errorString);

            emit message(msg);

        }

    }

}

// --------------- AbstractBluetoothStarter

AbstractBluetoothStarter::AbstractBluetoothStarter(const TrkDevicePtr &trkDevice, QObject *parent) :

    BaseCommunicationStarter(trkDevice, parent)

{

}

bool AbstractBluetoothStarter::initializeStartupResources(QString *errorMessage)

{

    // Create the listener and forward messages to it.

    BluetoothListener *listener = createListener();

    connect(this, SIGNAL(message(QString)), listener, SLOT(emitMessage(QString)));

    return listener->start(device(), errorMessage);

}

// -------- ConsoleBluetoothStarter

ConsoleBluetoothStarter::ConsoleBluetoothStarter(const TrkDevicePtr &trkDevice,

                                                 QObject *listenerParent,

                                                 QObject *parent) :

AbstractBluetoothStarter(trkDevice, parent),

m_listenerParent(listenerParent)

{

}

BluetoothListener *ConsoleBluetoothStarter::createListener()

{

    BluetoothListener *rc = new BluetoothListener(m_listenerParent);

    rc->setMode(BluetoothListener::Listen);

    rc->setPrintConsoleMessages(true);

    return rc;

}

bool ConsoleBluetoothStarter::startBluetooth(const TrkDevicePtr &trkDevice,

                                             QObject *listenerParent,

                                             int attempts,

                                             QString *errorMessage)

{

    // Set up a console starter to print to stdout.

    ConsoleBluetoothStarter starter(trkDevice, listenerParent);

    starter.setAttempts(attempts);

    switch (starter.start()) {

    case Started:

        break;

    case ConnectionSucceeded:

        return true;

    case StartError:

        *errorMessage = starter.errorString();

        return false;

    }

    // Run the starter with an event loop. @ToDo: Implement

    // some asynchronous keypress read to cancel.

    QEventLoop eventLoop;

    connect(&starter, SIGNAL(connected()), &eventLoop, SLOT(quit()));

    connect(&starter, SIGNAL(timeout()), &eventLoop, SLOT(quit()));

    eventLoop.exec(QEventLoop::ExcludeUserInputEvents);

    if (starter.state() != AbstractBluetoothStarter::Connected) {

        *errorMessage = starter.errorString();

        return false;

    }

    return true;

}

} // namespace trk