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#include "qgstreamerplayercontrol.h"

#include "qgstreamerplayersession.h"

#include <qmediaplaylistnavigator.h>

#include <QtCore/qdir.h>

#include <QtCore/qsocketnotifier.h>

#include <QtCore/qurl.h>

#include <QtCore/qdebug.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

QGstreamerPlayerControl::QGstreamerPlayerControl(QGstreamerPlayerSession *session, QObject *parent)

    : QMediaPlayerControl(parent)

    , m_session(session)

    , m_state(QMediaPlayer::StoppedState)

    , m_mediaStatus(QMediaPlayer::NoMedia)

    , m_bufferProgress(-1)

    , m_stream(0)

    , m_fifoNotifier(0)

    , m_fifoCanWrite(false)

    , m_bufferSize(0)

    , m_bufferOffset(0)

{

    m_fifoFd[0] = -1;

    m_fifoFd[1] = -1;

    connect(m_session, SIGNAL(positionChanged(qint64)),

            this, SIGNAL(positionChanged(qint64)));

    connect(m_session, SIGNAL(durationChanged(qint64)),

            this, SIGNAL(durationChanged(qint64)));

    connect(m_session, SIGNAL(mutedStateChanged(bool)),

            this, SIGNAL(mutedChanged(bool)));

    connect(m_session, SIGNAL(volumeChanged(int)),

            this, SIGNAL(volumeChanged(int)));

    connect(m_session, SIGNAL(stateChanged(QMediaPlayer::State)),

            this, SLOT(updateState(QMediaPlayer::State)));

    connect(m_session,SIGNAL(bufferingProgressChanged(int)),

            this, SLOT(setBufferProgress(int)));

    connect(m_session, SIGNAL(playbackFinished()),

            this, SLOT(processEOS()));

    connect(m_session, SIGNAL(audioAvailableChanged(bool)),

            this, SIGNAL(audioAvailableChanged(bool)));

    connect(m_session, SIGNAL(videoAvailableChanged(bool)),

            this, SIGNAL(videoAvailableChanged(bool)));

    connect(m_session, SIGNAL(seekableChanged(bool)),

            this, SIGNAL(seekableChanged(bool)));

    connect(m_session, SIGNAL(error(int,QString)),

            this, SIGNAL(error(int,QString)));

}

QGstreamerPlayerControl::~QGstreamerPlayerControl()

{

    if (m_fifoFd[0] >= 0) {

        ::close(m_fifoFd[0]);

        ::close(m_fifoFd[1]);

        m_fifoFd[0] = -1;

        m_fifoFd[1] = -1;

    }

}

qint64 QGstreamerPlayerControl::position() const

{

}

qint64 QGstreamerPlayerControl::duration() const

{

    return m_session->duration();

}

QMediaPlayer::State QGstreamerPlayerControl::state() const

{

    return m_state;

}

QMediaPlayer::MediaStatus QGstreamerPlayerControl::mediaStatus() const

{

    return m_mediaStatus;

}

int QGstreamerPlayerControl::bufferStatus() const

{

    if (m_bufferProgress == -1) {

        return m_session->state() == QMediaPlayer::StoppedState ? 0 : 100;

    } else

        return m_bufferProgress;

}

int QGstreamerPlayerControl::volume() const

{

    return m_session->volume();

}

bool QGstreamerPlayerControl::isMuted() const

{

    return m_session->isMuted();

}

bool QGstreamerPlayerControl::isSeekable() const

{

    return m_session->isSeekable();

}

QMediaTimeRange QGstreamerPlayerControl::availablePlaybackRanges() const

{

    QMediaTimeRange ranges;

    if (m_session->isSeekable())

        ranges.addInterval(0, m_session->duration());

    return ranges;

}

qreal QGstreamerPlayerControl::playbackRate() const

{

    return m_session->playbackRate();

}

void QGstreamerPlayerControl::setPlaybackRate(qreal rate)

{

    m_session->setPlaybackRate(rate);

}

void QGstreamerPlayerControl::setPosition(qint64 pos)

{

}

void QGstreamerPlayerControl::play()

{

}

void QGstreamerPlayerControl::pause()

{

    }

}

void QGstreamerPlayerControl::stop()

{

    if (m_state != QMediaPlayer::StoppedState) {

        m_session->pause();

        emit positionChanged(0);

    }

}

void QGstreamerPlayerControl::setVolume(int volume)

{

    m_session->setVolume(volume);

}

void QGstreamerPlayerControl::setMuted(bool muted)

{

    m_session->setMuted(muted);

}

QMediaContent QGstreamerPlayerControl::media() const

{

    return m_currentResource;

}

const QIODevice *QGstreamerPlayerControl::mediaStream() const

{

    return m_stream;

}

void QGstreamerPlayerControl::setMedia(const QMediaContent &content, QIODevice *stream)

{

    QMediaPlayer::State oldState = m_state;

    m_state = QMediaPlayer::StoppedState;    

    m_session->stop();

    if (m_bufferProgress != -1) {

        m_bufferProgress = -1;

        emit bufferStatusChanged(0);

    }

    if (m_stream) {

        closeFifo();

        disconnect(m_stream, SIGNAL(readyRead()), this, SLOT(writeFifo()));

        m_stream = 0;

    }

    m_currentResource = content;

    m_stream = stream;

    QUrl url;

    if (m_stream) {

        if (m_stream->isReadable() && openFifo()) {

            url = QUrl(QString(QLatin1String("fd://%1")).arg(m_fifoFd[0]));

        }

    } else if (!content.isNull()) {

        url = content.canonicalUrl();

    }

    if (m_fifoFd[1] >= 0) {

        m_fifoCanWrite = true;

        writeFifo();

    }

    if (!url.isEmpty()) {

        if (m_mediaStatus != QMediaPlayer::LoadingMedia)

            emit mediaStatusChanged(m_mediaStatus = QMediaPlayer::LoadingMedia);

        m_session->pause();

    } else {

        if (m_mediaStatus != QMediaPlayer::NoMedia)

            emit mediaStatusChanged(m_mediaStatus = QMediaPlayer::NoMedia);

        setBufferProgress(0);

    }

    emit mediaChanged(m_currentResource);

    if (m_state != oldState)

        emit stateChanged(m_state);

}

void QGstreamerPlayerControl::setVideoOutput(QObject *output)

{

    m_session->setVideoRenderer(output);

}

bool QGstreamerPlayerControl::isAudioAvailable() const

{

    return m_session->isAudioAvailable();

}

bool QGstreamerPlayerControl::isVideoAvailable() const

{

    return m_session->isVideoAvailable();

}

void QGstreamerPlayerControl::updateState(QMediaPlayer::State state)

{

    QMediaPlayer::MediaStatus oldStatus = m_mediaStatus;

    switch (state) {

    case QMediaPlayer::StoppedState:

        break;

    case QMediaPlayer::PlayingState:

    case QMediaPlayer::PausedState:

            m_mediaStatus = QMediaPlayer::LoadedMedia;

                m_mediaStatus = QMediaPlayer::BufferedMedia;

        }

        break;

    }

    if (m_mediaStatus != oldStatus)

        emit mediaStatusChanged(m_mediaStatus);

}

void QGstreamerPlayerControl::processEOS()

{

    m_mediaStatus = QMediaPlayer::EndOfMedia;

    emit mediaStatusChanged(m_mediaStatus);

}

void QGstreamerPlayerControl::setBufferProgress(int progress)

{

    if (m_bufferProgress == progress || m_mediaStatus == QMediaPlayer::NoMedia)

        return;

    QMediaPlayer::MediaStatus oldStatus = m_mediaStatus;

    m_bufferProgress = progress;

    if (m_state == QMediaPlayer::StoppedState) {

        m_mediaStatus = QMediaPlayer::LoadedMedia;

    } else {

        if (m_bufferProgress < 100) {

            m_mediaStatus = QMediaPlayer::StalledMedia;

            m_session->pause();

        } else {

            m_mediaStatus = QMediaPlayer::BufferedMedia;

            if (m_state == QMediaPlayer::PlayingState)

                m_session->play();

        }

    }

    if (m_mediaStatus != oldStatus)

        emit mediaStatusChanged(m_mediaStatus);

    emit bufferStatusChanged(m_bufferProgress);

}

void QGstreamerPlayerControl::writeFifo()

{

    if (m_fifoCanWrite) {

        qint64 bytesToRead = qMin<qint64>(

                m_stream->bytesAvailable(), PIPE_BUF - m_bufferSize);

        if (bytesToRead > 0) {

            int bytesRead = m_stream->read(&m_buffer[m_bufferOffset + m_bufferSize], bytesToRead);

            if (bytesRead > 0)

                m_bufferSize += bytesRead;

        }

        if (m_bufferSize > 0) {

            int bytesWritten = ::write(m_fifoFd[1], &m_buffer[m_bufferOffset], size_t(m_bufferSize));

            if (bytesWritten > 0) {

                m_bufferOffset += bytesWritten;

                m_bufferSize -= bytesWritten;

                if (m_bufferSize == 0)

                    m_bufferOffset = 0;

            } else if (errno == EAGAIN) {

                m_fifoCanWrite = false;

            } else {

                closeFifo();

            }

        }

    }

    m_fifoNotifier->setEnabled(m_stream->bytesAvailable() > 0);

}

void QGstreamerPlayerControl::fifoReadyWrite(int socket)

{

    if (socket == m_fifoFd[1]) {

        m_fifoCanWrite = true;

        writeFifo();

    }

}

bool QGstreamerPlayerControl::openFifo()

{

    Q_ASSERT(m_fifoFd[0] < 0);

    Q_ASSERT(m_fifoFd[1] < 0);

    if (::pipe(m_fifoFd) == 0) {

        int flags = ::fcntl(m_fifoFd[1], F_GETFD);

        if (::fcntl(m_fifoFd[1], F_SETFD, flags | O_NONBLOCK) >= 0) {

            m_fifoNotifier = new QSocketNotifier(m_fifoFd[1], QSocketNotifier::Write);

            connect(m_fifoNotifier, SIGNAL(activated(int)), this, SLOT(fifoReadyWrite(int)));

            return true;

        } else {

            qWarning("Failed to make pipe non blocking %d", errno);

            ::close(m_fifoFd[0]);

            ::close(m_fifoFd[1]);

            m_fifoFd[0] = -1;

            m_fifoFd[1] = -1;

            return false;

        }

    } else {

        qWarning("Failed to create pipe %d", errno);

        return false;

    }

}

void QGstreamerPlayerControl::closeFifo()

{

    if (m_fifoFd[0] >= 0) {

        delete m_fifoNotifier;

        m_fifoNotifier = 0;

        ::close(m_fifoFd[0]);

        ::close(m_fifoFd[1]);

        m_fifoFd[0] = -1;

        m_fifoFd[1] = -1;

        m_fifoCanWrite = false;

        m_bufferSize = 0;

        m_bufferOffset = 0;

    }

}