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#include "qgstreamermetadataprovider.h"
#include "qgstreamerplayersession.h"
#include <QDebug>

#include <gst/gstversion.h>

struct QGstreamerMetaDataKeyLookup
{
    QtMediaServices::MetaData key;
    const char *token;
};

static const QGstreamerMetaDataKeyLookup qt_gstreamerMetaDataKeys[] =
{
    { QtMediaServices::Title, GST_TAG_TITLE },
    //{ QtMediaServices::SubTitle, 0 },
    //{ QtMediaServices::Author, 0 },
    { QtMediaServices::Comment, GST_TAG_COMMENT },
    { QtMediaServices::Description, GST_TAG_DESCRIPTION },
    //{ QtMediaServices::Category, 0 },
    { QtMediaServices::Genre, GST_TAG_GENRE },
    { QtMediaServices::Year, "year" },
    //{ QtMediaServices::UserRating, 0 },

    { QtMediaServices::Language, GST_TAG_LANGUAGE_CODE },

    { QtMediaServices::Publisher, GST_TAG_ORGANIZATION },
    { QtMediaServices::Copyright, GST_TAG_COPYRIGHT },
    //{ QtMediaServices::ParentalRating, 0 },
    //{ QtMediaServices::RatingOrganisation, 0 },

    // Media
    //{ QtMediaServices::Size, 0 },
    //{ QtMediaServices::MediaType, 0 },
    { QtMediaServices::Duration, GST_TAG_DURATION },

    // Audio
    { QtMediaServices::AudioBitRate, GST_TAG_BITRATE },
    { QtMediaServices::AudioCodec, GST_TAG_AUDIO_CODEC },
    //{ QtMediaServices::ChannelCount, 0 },
    //{ QtMediaServices::SampleRate, 0 },

    // Music
    { QtMediaServices::AlbumTitle, GST_TAG_ALBUM },
    { QtMediaServices::AlbumArtist,  GST_TAG_ARTIST},
    { QtMediaServices::ContributingArtist, GST_TAG_PERFORMER },
#if (GST_VERSION_MAJOR >= 0) && (GST_VERSION_MINOR >= 10) && (GST_VERSION_MICRO >= 19)
    { QtMediaServices::Composer, GST_TAG_COMPOSER },
#endif
    //{ QtMediaServices::Conductor, 0 },
    //{ QtMediaServices::Lyrics, 0 },
    //{ QtMediaServices::Mood, 0 },
    { QtMediaServices::TrackNumber, GST_TAG_TRACK_NUMBER },

    //{ QtMediaServices::CoverArtUrlSmall, 0 },
    //{ QtMediaServices::CoverArtUrlLarge, 0 },

    // Image/Video
    //{ QtMediaServices::Resolution, 0 },
    //{ QtMediaServices::PixelAspectRatio, 0 },

    // Video
    //{ QtMediaServices::VideoFrameRate, 0 },
    //{ QtMediaServices::VideoBitRate, 0 },
    { QtMediaServices::VideoCodec, GST_TAG_VIDEO_CODEC },

    //{ QtMediaServices::PosterUrl, 0 },

    // Movie
    //{ QtMediaServices::ChapterNumber, 0 },
    //{ QtMediaServices::Director, 0 },
    { QtMediaServices::LeadPerformer, GST_TAG_PERFORMER },
    //{ QtMediaServices::Writer, 0 },

    // Photos
    //{ QtMediaServices::CameraManufacturer, 0 },
    //{ QtMediaServices::CameraModel, 0 },
    //{ QtMediaServices::Event, 0 },
    //{ QtMediaServices::Subject, 0 }
};

QGstreamerMetaDataProvider::QGstreamerMetaDataProvider(QGstreamerPlayerSession *session, QObject *parent)
    :QMetaDataControl(parent), m_session(session)
{
    connect(m_session, SIGNAL(tagsChanged()), SLOT(updateTags()));
}

QGstreamerMetaDataProvider::~QGstreamerMetaDataProvider()
{
}

bool QGstreamerMetaDataProvider::isMetaDataAvailable() const
{
    return !m_session->tags().isEmpty();
}

bool QGstreamerMetaDataProvider::isWritable() const
{
    return false;
}

QVariant QGstreamerMetaDataProvider::metaData(QtMediaServices::MetaData key) const
{
    static const int count = sizeof(qt_gstreamerMetaDataKeys) / sizeof(QGstreamerMetaDataKeyLookup);

    for (int i = 0; i < count; ++i) {
        if (qt_gstreamerMetaDataKeys[i].key == key) {
            return m_session->tags().value(QByteArray(qt_gstreamerMetaDataKeys[i].token));
        }
    }
    return QVariant();
}

void QGstreamerMetaDataProvider::setMetaData(QtMediaServices::MetaData key, QVariant const &value)
{
    Q_UNUSED(key);
    Q_UNUSED(value);
}

QList<QtMediaServices::MetaData> QGstreamerMetaDataProvider::availableMetaData() const
{
    static QMap<QByteArray, QtMediaServices::MetaData> keysMap;
    if (keysMap.isEmpty()) {
        const int count = sizeof(qt_gstreamerMetaDataKeys) / sizeof(QGstreamerMetaDataKeyLookup);
        for (int i = 0; i < count; ++i) {
            keysMap[QByteArray(qt_gstreamerMetaDataKeys[i].token)] = qt_gstreamerMetaDataKeys[i].key;
        }
    }

    QList<QtMediaServices::MetaData> res;
    foreach (const QByteArray &key, m_session->tags().keys()) {
        QtMediaServices::MetaData tag = keysMap.value(key, QtMediaServices::MetaData(-1));
        if (tag != -1)
            res.append(tag);
    }

    return res;
}

QVariant QGstreamerMetaDataProvider::extendedMetaData(const QString &key) const
{
    return m_session->tags().value(key.toLatin1());
}

void QGstreamerMetaDataProvider::setExtendedMetaData(const QString &key, QVariant const &value)
{
    Q_UNUSED(key);
    Q_UNUSED(value);
}

QStringList QGstreamerMetaDataProvider::availableExtendedMetaData() const
{
    QStringList res;
    foreach (const QByteArray &key, m_session->tags().keys())
        res.append(QString(key));

    return res;
}

void QGstreamerMetaDataProvider::updateTags()
{
    emit metaDataChanged();
}