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#include <QMap>

#include <QTimer>

#include <QMutex>

#include "qgstreamerbushelper.h"

#ifndef QT_NO_GLIB

class QGstreamerBusHelperPrivate : public QObject

{

    Q_OBJECT

public:

    void addWatch(GstBus* bus, QGstreamerBusHelper* helper)

    {

        setParent(helper);

        m_tag = gst_bus_add_watch_full(bus, 0, busCallback, this, NULL);

        m_helper = helper;

        filter = 0;

    }

    void removeWatch(QGstreamerBusHelper* helper)

    {

        Q_UNUSED(helper);

        g_source_remove(m_tag);

    }

    static QGstreamerBusHelperPrivate* instance()

    {

        return new QGstreamerBusHelperPrivate;

    }

private:

    void processMessage(GstBus* bus, GstMessage* message)

    {

        Q_UNUSED(bus);

        emit m_helper->message(message);

    }

    static gboolean busCallback(GstBus *bus, GstMessage *message, gpointer data)

    {

        reinterpret_cast<QGstreamerBusHelperPrivate*>(data)->processMessage(bus, message);

        return TRUE;

    }

    guint       m_tag;

    QGstreamerBusHelper*  m_helper;

public:

    GstBus* bus;

    QGstreamerSyncEventFilter *filter;

    QMutex filterMutex;

};

#else

class QGstreamerBusHelperPrivate : public QObject

{

    Q_OBJECT

    typedef QMap<QGstreamerBusHelper*, GstBus*>   HelperMap;

public:

    void addWatch(GstBus* bus, QGstreamerBusHelper* helper)

    {

        m_helperMap.insert(helper, bus);

        if (m_helperMap.size() == 1)

            m_intervalTimer->start();

    }

    void removeWatch(QGstreamerBusHelper* helper)

    {

        m_helperMap.remove(helper);

        if (m_helperMap.size() == 0)

            m_intervalTimer->stop();

    }

    static QGstreamerBusHelperPrivate* instance()

    {

        static QGstreamerBusHelperPrivate self;

        return &self;

    }

private slots:

    void interval()

    {

        for (HelperMap::iterator it = m_helperMap.begin(); it != m_helperMap.end(); ++it) {

            GstMessage* message;

            while ((message = gst_bus_poll(it.value(), GST_MESSAGE_ANY, 0)) != 0) {

                emit it.key()->message(message);

                gst_message_unref(message);

            }

            emit it.key()->message(QGstreamerMessage());

        }

    }

private:

    QGstreamerBusHelperPrivate()

    {

        m_intervalTimer = new QTimer(this);

        m_intervalTimer->setInterval(250);

        connect(m_intervalTimer, SIGNAL(timeout()), SLOT(interval()));

    }

    HelperMap   m_helperMap;

    QTimer*     m_intervalTimer;

public:

    GstBus* bus;

    QGstreamerSyncEventFilter *filter;

    QMutex filterMutex;

};

#endif

static GstBusSyncReply syncGstBusFilter(GstBus* bus, GstMessage* message, QGstreamerBusHelperPrivate *d)

{

    Q_UNUSED(bus);

    QMutexLocker lock(&d->filterMutex);

    bool res = false;

    if (d->filter)

        res = d->filter->processSyncMessage(QGstreamerMessage(message));

    return res ? GST_BUS_DROP : GST_BUS_PASS;

}

/*!

    \class gstreamer::QGstreamerBusHelper

    \internal

*/

QGstreamerBusHelper::QGstreamerBusHelper(GstBus* bus, QObject* parent):

    QObject(parent),

    d(QGstreamerBusHelperPrivate::instance())

{

    d->bus = bus;

    d->addWatch(bus, this);

    gst_bus_set_sync_handler(bus, (GstBusSyncHandler)syncGstBusFilter, d);

}

QGstreamerBusHelper::~QGstreamerBusHelper()

{

    d->removeWatch(this);

    gst_bus_set_sync_handler(d->bus,0,0);

}

void QGstreamerBusHelper::installSyncEventFilter(QGstreamerSyncEventFilter *filter)

{

    QMutexLocker lock(&d->filterMutex);

    d->filter = filter;

}

#include "qgstreamerbushelper.moc"