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#include <QtCore/qcoreevent.h>

#include <QtCore/qmetaobject.h>

#include <QtCore/qtimer.h>

#include <QtCore/qdebug.h>

#include <QtCore/qpointer.h>

#include <qmediaplayer.h>

#include <qmediaobject_p.h>

#include <qmediaservice.h>

#include <qmediaplayercontrol.h>

#include <qmediaserviceprovider.h>

#include <qmediaplaylist.h>

#include <qmediaplaylistcontrol.h>

#include <qvideowidget.h>

#include <qgraphicsvideoitem.h>

QTM_BEGIN_NAMESPACE

/*!

    \class QMediaPlayer

    \brief The QMediaPlayer class allows the playing of a media source.

    \ingroup multimedia

    \preliminary

    The QMediaPlayer class is a high level media playback class. It can be used

    to playback such content as songs, movies and internet radio. The content

    to playback is specified as a QMediaContent, which can be thought of as a

    main or canonical URL with addition information attached. When provided

    with a QMediaContent playback may be able to commence.

    \code

        player = new QMediaPlayer;

        connect(player, SIGNAL(positionChanged(qint64)), this, SLOT(positionChanged(qint64)));

        player->setMedia(QUrl::fromLocalFile("/Users/me/Music/coolsong.mp3"));

        player->setVolume(50);

        player->play();

    \endcode

    QVideoWidget can be used with QMediaPlayer for video rendering and QMediaPlaylist

    for accessing playlist functionality.

    \code

        player = new QMediaPlayer;

        playlist = new QMediaPlaylist;

        playlist->setMediaObject(player);

        playlist->append(QUrl("http://example.com/movie1.mp4"));

        playlist->append(QUrl("http://example.com/movie2.mp4"));

        widget = new QVideoWidget;

        widget->setMediaObject(player);

        widget->show();

        player->play();

    \endcode

    \sa QMediaObject, QMediaService, QVideoWidget, QMediaPlaylist

*/

namespace

{

class MediaPlayerRegisterMetaTypes

{

public:

    MediaPlayerRegisterMetaTypes()

    {

        qRegisterMetaType<QMediaPlayer::State>("QMediaPlayer::State");

        qRegisterMetaType<QMediaPlayer::MediaStatus>("QMediaPlayer::MediaStatus");

        qRegisterMetaType<QMediaPlayer::Error>("QMediaPlayer::Error");

    }

} _registerPlayerMetaTypes;

}

class QMediaPlayerPrivate : public QMediaObjectPrivate

{

    Q_DECLARE_NON_CONST_PUBLIC(QMediaPlayer)

public:

    QMediaPlayerPrivate()

        : provider(0)

        , control(0)

        , playlistControl(0)

        , state(QMediaPlayer::StoppedState)

        , error(QMediaPlayer::NoError)

        , filterStates(false)

        , playlist(0)

    {}

    QMediaServiceProvider *provider;

    QMediaPlayerControl* control;

    QMediaPlaylistControl* playlistControl;

    QMediaPlayer::State state;

    QMediaPlayer::Error error;

    QString errorString;

    bool filterStates;

    QMediaPlaylist *playlist;

    QPointer<QVideoWidget> videoWidget;

    QPointer<QGraphicsVideoItem> videoItem;

    void _q_stateChanged(QMediaPlayer::State state);

    void _q_mediaStatusChanged(QMediaPlayer::MediaStatus status);

    void _q_error(int error, const QString &errorString);

    void _q_updateMedia(const QMediaContent&);

    void _q_playlistDestroyed();

};

void QMediaPlayerPrivate::_q_stateChanged(QMediaPlayer::State ps)

{

    Q_Q(QMediaPlayer);

    if (filterStates)

        return;

    if (playlist

            && !playlistControl //service should do this itself

            && ps != state && ps == QMediaPlayer::StoppedState

            && control->mediaStatus() == QMediaPlayer::EndOfMedia) {

        playlist->next();

        ps = control->state();

    }

    if (ps != state) {

        state = ps;

        if (ps == QMediaPlayer::PlayingState)

            q->addPropertyWatch("position");

        else

            q->removePropertyWatch("position");

        emit q->stateChanged(ps);

    }

}

void QMediaPlayerPrivate::_q_mediaStatusChanged(QMediaPlayer::MediaStatus status)

{

    Q_Q(QMediaPlayer);

    switch (status) {

    case QMediaPlayer::StalledMedia:

    case QMediaPlayer::BufferingMedia:

        q->addPropertyWatch("bufferStatus");

        emit q->mediaStatusChanged(status);

        break;

    default:

        q->removePropertyWatch("bufferStatus");

        emit q->mediaStatusChanged(status);

        break;

    }

}

void QMediaPlayerPrivate::_q_error(int error, const QString &errorString)

{

    Q_Q(QMediaPlayer);

    this->error = QMediaPlayer::Error(error);

    this->errorString = errorString;

    emit q->error(this->error);

}

void QMediaPlayerPrivate::_q_updateMedia(const QMediaContent &media)

{

    const QMediaPlayer::State currentState = state;

    filterStates = true;

    control->setMedia(media, 0);

    if (!media.isNull()) {

        switch (currentState) {

        case QMediaPlayer::PlayingState:

            control->play();

            break;

        case QMediaPlayer::PausedState:

            control->pause();

            break;

        default:

            break;

        }

    }

    filterStates = false;

    state = control->state();

    if (state != currentState)

        emit q_func()->stateChanged(state);

}

void QMediaPlayerPrivate::_q_playlistDestroyed()

{

    playlist = 0;

    control->setMedia(QMediaContent(), 0);

}

static QMediaService *playerService(QMediaPlayer::Flags flags, QMediaServiceProvider *provider)

{

    if (flags && QMediaPlayer::LowLatency)

        return provider->requestService(Q_MEDIASERVICE_MEDIAPLAYER,

                                        QMediaServiceProviderHint(QMediaServiceProviderHint::LowLatencyPlayback));

    else

        return provider->requestService(Q_MEDIASERVICE_MEDIAPLAYER);

}

/*!

    Construct a QMediaPlayer that uses the playback service from \a provider,

    parented to \a parent and with \a flags.

    If a playback service is not specified the system default will be used.

*/

QMediaPlayer::QMediaPlayer(QObject *parent, QMediaPlayer::Flags flags, QMediaServiceProvider *provider):

    QMediaObject(*new QMediaPlayerPrivate,

                 parent,

                 playerService(flags,provider))

{

    Q_D(QMediaPlayer);

    d->provider = provider;

    if (d->service == 0) {

        d->error = ServiceMissingError;

    } else {

        d->control = qobject_cast<QMediaPlayerControl*>(d->service->control(QMediaPlayerControl_iid));

        d->playlistControl = qobject_cast<QMediaPlaylistControl*>(d->service->control(QMediaPlaylistControl_iid));

        if (d->control != 0) {

            connect(d->control, SIGNAL(mediaChanged(QMediaContent)), SIGNAL(mediaChanged(QMediaContent)));

            connect(d->control, SIGNAL(stateChanged(QMediaPlayer::State)), SLOT(_q_stateChanged(QMediaPlayer::State)));

            connect(d->control, SIGNAL(mediaStatusChanged(QMediaPlayer::MediaStatus)),

                    SLOT(_q_mediaStatusChanged(QMediaPlayer::MediaStatus)));

            connect(d->control, SIGNAL(error(int,QString)), SLOT(_q_error(int,QString)));

            connect(d->control, SIGNAL(durationChanged(qint64)), SIGNAL(durationChanged(qint64)));

            connect(d->control, SIGNAL(positionChanged(qint64)), SIGNAL(positionChanged(qint64)));

            connect(d->control, SIGNAL(audioAvailableChanged(bool)), SIGNAL(audioAvailableChanged(bool)));

            connect(d->control, SIGNAL(videoAvailableChanged(bool)), SIGNAL(videoAvailableChanged(bool)));

            connect(d->control, SIGNAL(volumeChanged(int)), SIGNAL(volumeChanged(int)));

            connect(d->control, SIGNAL(mutedChanged(bool)), SIGNAL(mutedChanged(bool)));

            connect(d->control, SIGNAL(seekableChanged(bool)), SIGNAL(seekableChanged(bool)));

            connect(d->control, SIGNAL(playbackRateChanged(qreal)), SIGNAL(playbackRateChanged(qreal)));

            if (d->control->state() == PlayingState)

                addPropertyWatch("position");

            if (d->control->mediaStatus() == StalledMedia || d->control->mediaStatus() == BufferingMedia)

                addPropertyWatch("bufferStatus");

        }

    }

}

/*!

    Destroys the player object.

*/

QMediaPlayer::~QMediaPlayer()

{

    Q_D(QMediaPlayer);

    d->provider->releaseService(d->service);

}

QMediaContent QMediaPlayer::media() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->media();

    return QMediaContent();

}

/*!

    Returns the stream source of media data.

    This is only valid if a stream was passed to setMedia().

    \sa setMedia()

*/

const QIODevice *QMediaPlayer::mediaStream() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->mediaStream();

    return 0;

}

QMediaPlayer::State QMediaPlayer::state() const

{

    return d_func()->state;

}

QMediaPlayer::MediaStatus QMediaPlayer::mediaStatus() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->mediaStatus();

    return QMediaPlayer::UnknownMediaStatus;

}

qint64 QMediaPlayer::duration() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->duration();

    return -1;

}

qint64 QMediaPlayer::position() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->position();

    return 0;

}

int QMediaPlayer::volume() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->volume();

    return 0;

}

bool QMediaPlayer::isMuted() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->isMuted();

    return false;

}

int QMediaPlayer::bufferStatus() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->bufferStatus();

    return 0;

}

bool QMediaPlayer::isAudioAvailable() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->isAudioAvailable();

    return false;

}

bool QMediaPlayer::isVideoAvailable() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->isVideoAvailable();

    return false;

}

bool QMediaPlayer::isSeekable() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->isSeekable();

    return false;

}

qreal QMediaPlayer::playbackRate() const

{

    Q_D(const QMediaPlayer);

    if (d->control != 0)

        return d->control->playbackRate();

    return 0.0;

}

/*!

    Returns the current error state.

*/

QMediaPlayer::Error QMediaPlayer::error() const

{

    return d_func()->error;

}

QString QMediaPlayer::errorString() const

{

    return d_func()->errorString;

}

//public Q_SLOTS:

/*!

    Start or resume playing the current source.

*/

void QMediaPlayer::play()

{

    Q_D(QMediaPlayer);

    if (d->control == 0) {

        QMetaObject::invokeMethod(this, "_q_error", Qt::QueuedConnection);

                                    Q_ARG(int, QMediaPlayer::ServiceMissingError),

                                    Q_ARG(QString, tr("The QMediaPlayer object does not have a valid service"));

        return;

    }

    //if playlist control is available, the service should advance itself

    if (d->playlist && !d->playlistControl && d->playlist->currentIndex() == -1 && !d->playlist->isEmpty())

        d->playlist->setCurrentIndex(0);

    // Reset error conditions

    d->error = NoError;

    d->errorString = QString();

    d->control->play();

}

/*!

    Pause playing the current source.

*/

void QMediaPlayer::pause()

{

    Q_D(QMediaPlayer);

    if (d->control != 0)

        d->control->pause();

}

/*!

    Stop playing, and reset the play position to the beginning.

*/

void QMediaPlayer::stop()

{

    Q_D(QMediaPlayer);

    if (d->control != 0)

        d->control->stop();

}

void QMediaPlayer::setPosition(qint64 position)

{

    Q_D(QMediaPlayer);

    if (d->control == 0 || !isSeekable())

        return;

    d->control->setPosition(qBound(qint64(0), duration(), position));

}

void QMediaPlayer::setVolume(int v)

{

    Q_D(QMediaPlayer);

    if (d->control == 0)

        return;

    int clamped = qBound(0, v, 100);

    if (clamped == volume())

        return;

    d->control->setVolume(clamped);