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#include "qmediaplaylist.h"

#include "qmediaplaylist_p.h"

#include "qmediaplaylistprovider.h"

#include "qlocalmediaplaylistprovider.h"

#include "qmediaplaylistioplugin.h"

#include "qmediaservice.h"

#include "qmediaplaylistcontrol.h"

#include "qmediaplayercontrol.h"

#include <QtCore/qlist.h>

#include <QtCore/qfile.h>

#include <QtCore/qurl.h>

#include <QtCore/qcoreevent.h>

#include <QtCore/qcoreapplication.h>

#include "qmediapluginloader_p.h"

QT_BEGIN_NAMESPACE

Q_GLOBAL_STATIC_WITH_ARGS(QMediaPluginLoader, playlistIOLoader,

        (QMediaPlaylistIOInterface_iid, QLatin1String("playlistformats"), Qt::CaseInsensitive))

/*!

    \class QMediaPlaylist

    \ingroup multimedia

    \preliminary

    \brief The QMediaPlaylist class provides a list of media content to play.

    QMediaPlaylist is intended to be used with other media objects,

    like QMediaPlayer or QMediaImageViewer.

    QMediaPlaylist allows to access the service intrinsic playlist functionality

    if available, otherwise it provides the the local memory playlist implementation.

\code

    player = new QMediaPlayer;

    playlist = new QMediaPlaylist;

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

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

    playlist->append(QUrl("http://example.com/movie3.mp4"));

    playlist->setCurrentIndex(1);

    player->setPlaylist(playlist);

    player->play();

\endcode

    Depending on playlist source implementation, most of the playlist mutating

    operations can be asynchronous.

    \sa QMediaContent

*/

/*!

    \enum QMediaPlaylist::PlaybackMode

    The QMediaPlaylist::PlaybackMode describes the order items in playlist are played.

    \value CurrentItemOnce    The current item is played only once.

    \value CurrentItemInLoop  The current item is played repeatedly in a loop.

    \value Sequential         Playback starts from the current and moves through each successive item until the last is reached and then stops.

                              The next item is a null item when the last one is currently playing.

    \value Loop               Playback restarts at the first item after the last has finished playing.

    \value Random             Play items in random order.

*/

/*!

  Create a new playlist object for with the given \a parent.  

*/

QMediaPlaylist::QMediaPlaylist(QObject *parent)

    : QObject(parent)

    , d_ptr(new QMediaPlaylistPrivate)

{

    Q_D(QMediaPlaylist);

    d->q_ptr = this;

    d->localPlaylistControl = new QLocalMediaPlaylistControl(this);

    setMediaObject(0);

}

/*!

  Destroys the playlist.

  */

QMediaPlaylist::~QMediaPlaylist()

{

    Q_D(QMediaPlaylist);

    if (d->mediaObject)

        d->mediaObject->unbind(this);

    delete d_ptr;

}

/*!

  Returns the QMediaObject instance that this QMediaPlaylist is bound too,

  or 0 otherwise.

*/

QMediaObject *QMediaPlaylist::mediaObject() const

{

    return d_func()->mediaObject;

}

/*!

  \internal

  If \a mediaObject is null or doesn't have an intrinsic playlist,

  internal local memory playlist source will be created.

*/

bool QMediaPlaylist::setMediaObject(QMediaObject *mediaObject)

{

    Q_D(QMediaPlaylist);

    if (mediaObject && mediaObject == d->mediaObject)

        return true;

    QMediaService *service = mediaObject

            ? mediaObject->service() : 0;

    QMediaPlaylistControl *newControl = 0;

    if (service)

        newControl = qobject_cast<QMediaPlaylistControl*>(service->requestControl(QMediaPlaylistControl_iid));

    if (!newControl)

        newControl = d->localPlaylistControl;

    if (d->control != newControl) {

        int oldSize = 0;

        if (d->control) {

            QMediaPlaylistProvider *playlist = d->control->playlistProvider();

            oldSize = playlist->mediaCount();

            disconnect(playlist, SIGNAL(loadFailed(QMediaPlaylist::Error,QString)),

                    this, SLOT(_q_loadFailed(QMediaPlaylist::Error,QString)));

            disconnect(playlist, SIGNAL(mediaChanged(int,int)), this, SIGNAL(mediaChanged(int,int)));

            disconnect(playlist, SIGNAL(mediaAboutToBeInserted(int,int)), this, SIGNAL(mediaAboutToBeInserted(int,int)));

            disconnect(playlist, SIGNAL(mediaInserted(int,int)), this, SIGNAL(mediaInserted(int,int)));

            disconnect(playlist, SIGNAL(mediaAboutToBeRemoved(int,int)), this, SIGNAL(mediaAboutToBeRemoved(int,int)));

            disconnect(playlist, SIGNAL(mediaRemoved(int,int)), this, SIGNAL(mediaRemoved(int,int)));

            disconnect(playlist, SIGNAL(loaded()), this, SIGNAL(loaded()));

            disconnect(d->control, SIGNAL(playbackModeChanged(QMediaPlaylist::PlaybackMode)),

                    this, SIGNAL(playbackModeChanged(QMediaPlaylist::PlaybackMode)));

            disconnect(d->control, SIGNAL(currentIndexChanged(int)),

                    this, SIGNAL(currentIndexChanged(int)));

            disconnect(d->control, SIGNAL(currentMediaChanged(QMediaContent)),

                    this, SIGNAL(currentMediaChanged(QMediaContent)));

            if (d->mediaObject)

                d->mediaObject->service()->releaseControl(d->control);

        }

        d->control = newControl;

        QMediaPlaylistProvider *playlist = d->control->playlistProvider();

        connect(playlist, SIGNAL(loadFailed(QMediaPlaylist::Error,QString)),

                this, SLOT(_q_loadFailed(QMediaPlaylist::Error,QString)));

        connect(playlist, SIGNAL(mediaChanged(int,int)), this, SIGNAL(mediaChanged(int,int)));

        connect(playlist, SIGNAL(mediaAboutToBeInserted(int,int)), this, SIGNAL(mediaAboutToBeInserted(int,int)));

        connect(playlist, SIGNAL(mediaInserted(int,int)), this, SIGNAL(mediaInserted(int,int)));

        connect(playlist, SIGNAL(mediaAboutToBeRemoved(int,int)), this, SIGNAL(mediaAboutToBeRemoved(int,int)));

        connect(playlist, SIGNAL(mediaRemoved(int,int)), this, SIGNAL(mediaRemoved(int,int)));

        connect(playlist, SIGNAL(loaded()), this, SIGNAL(loaded()));

        connect(d->control, SIGNAL(playbackModeChanged(QMediaPlaylist::PlaybackMode)),

                this, SIGNAL(playbackModeChanged(QMediaPlaylist::PlaybackMode)));

        connect(d->control, SIGNAL(currentIndexChanged(int)),

                this, SIGNAL(currentIndexChanged(int)));

        connect(d->control, SIGNAL(currentMediaChanged(QMediaContent)),

                this, SIGNAL(currentMediaChanged(QMediaContent)));

        if (oldSize)

            emit mediaRemoved(0, oldSize-1);

        if (playlist->mediaCount()) {

            emit mediaAboutToBeInserted(0,playlist->mediaCount()-1);

            emit mediaInserted(0,playlist->mediaCount()-1);

        }

    }

    d->mediaObject = mediaObject;

    return true;

}

/*!

  \property QMediaPlaylist::playbackMode

  This property defines the order, items in playlist are played.

  \sa QMediaPlaylist::PlaybackMode

*/

QMediaPlaylist::PlaybackMode QMediaPlaylist::playbackMode() const

{

    return d_func()->control->playbackMode();

}

void QMediaPlaylist::setPlaybackMode(QMediaPlaylist::PlaybackMode mode)

{

    Q_D(QMediaPlaylist);

    d->control->setPlaybackMode(mode);

}

/*!

  Returns position of the current media content in the playlist.

*/

int QMediaPlaylist::currentIndex() const

{

    return d_func()->control->currentIndex();

}

/*!

  Returns the current media content.

*/

QMediaContent QMediaPlaylist::currentMedia() const

{

    return d_func()->playlist()->media(currentIndex());

}

/*!

  Returns the index of the item, which would be current after calling next()

  \a steps times.

  Returned value depends on the size of playlist, current position

  and playback mode.

  \sa QMediaPlaylist::playbackMode

*/

int QMediaPlaylist::nextIndex(int steps) const

{

    return d_func()->control->nextIndex(steps);

}

/*!

  Returns the index of the item, which would be current after calling previous()

  \a steps times.

  \sa QMediaPlaylist::playbackMode

*/

int QMediaPlaylist::previousIndex(int steps) const

{

    return d_func()->control->previousIndex(steps);

}

/*!

  Returns the number of items in the playlist.

  \sa isEmpty()

  */

int QMediaPlaylist::mediaCount() const

{

    return d_func()->playlist()->mediaCount();

}

/*!

  Returns true if the playlist contains no items; otherwise returns false.

  \sa size()

  */

bool QMediaPlaylist::isEmpty() const

{

    return mediaCount() == 0;

}

/*!

  Returns true if the playlist can be modified; otherwise returns false.

  \sa size()

  */

bool QMediaPlaylist::isReadOnly() const

{

    return d_func()->playlist()->isReadOnly();

}

/*!

  Returns the media content at \a index in the playlist.

*/

QMediaContent QMediaPlaylist::media(int index) const

{

    return d_func()->playlist()->media(index);

}

/*!

  Append the media \a content to the playlist.

  Returns true if the operation is successful, otherwise return false.

  */

bool QMediaPlaylist::addMedia(const QMediaContent &content)

{

    return d_func()->control->playlistProvider()->addMedia(content);

}

/*!

  Append multiple media content \a items to the playlist.

  Returns true if the operation is successful, otherwise return false.

  */

bool QMediaPlaylist::addMedia(const QList<QMediaContent> &items)

{

    return d_func()->control->playlistProvider()->addMedia(items);

}

/*!

  Insert the media \a content to the playlist at position \a pos.

  Returns true if the operation is successful, otherwise false.

*/

bool QMediaPlaylist::insertMedia(int pos, const QMediaContent &content)

{

    return d_func()->playlist()->insertMedia(pos, content);

}

/*!

  Insert multiple media content \a items to the playlist at position \a pos.

  Returns true if the operation is successful, otherwise false.

*/

bool QMediaPlaylist::insertMedia(int pos, const QList<QMediaContent> &items)

{

    return d_func()->playlist()->insertMedia(pos, items);

}

/*!

  Remove the item from the playlist at position \a pos.

  Returns true if the operation is successful, otherwise return false.

  */

bool QMediaPlaylist::removeMedia(int pos)

{

    Q_D(QMediaPlaylist);

    return d->playlist()->removeMedia(pos);

}

/*!

  Remove items in the playlist from \a start to \a end inclusive.

  Returns true if the operation is successful, otherwise return false.

  */

bool QMediaPlaylist::removeMedia(int start, int end)

{

    Q_D(QMediaPlaylist);

    return d->playlist()->removeMedia(start, end);

}

/*!

  Remove all the items from the playlist.

  Returns true if the operation is successful, otherwise return false.

  */

bool QMediaPlaylist::clear()

{

    Q_D(QMediaPlaylist);

    return d->playlist()->clear();

}

bool QMediaPlaylistPrivate::readItems(QMediaPlaylistReader *reader)

{

    while (!reader->atEnd())

        playlist()->addMedia(reader->readItem());

    return true;

}

bool QMediaPlaylistPrivate::writeItems(QMediaPlaylistWriter *writer)

{

    for (int i=0; i<playlist()->mediaCount(); i++) {

        if (!writer->writeItem(playlist()->media(i)))

            return false;

    }

    writer->close();

    return true;

}

/*!

  Load playlist from \a location. If \a format is specified, it is used,

  otherwise format is guessed from location name and data.

  New items are appended to playlist.

  QMediaPlaylist::loaded() signal is emitted if playlist was loaded successfully,

  otherwise the playlist emits loadFailed().

*/

void QMediaPlaylist::load(const QUrl &location, const char *format)

{

    Q_D(QMediaPlaylist);

    d->error = NoError;

    d->errorString.clear();

    if (d->playlist()->load(location,format))

        return;

    if (isReadOnly()) {

        d->error = AccessDeniedError;

        d->errorString = tr("Could not add items to read only playlist.");

        emit loadFailed();

        return;

    }

    foreach (QString const& key, playlistIOLoader()->keys()) {

        QMediaPlaylistIOInterface* plugin = qobject_cast<QMediaPlaylistIOInterface*>(playlistIOLoader()->instance(key));

        if (plugin && plugin->canRead(location,format)) {

            QMediaPlaylistReader *reader = plugin->createReader(location,QByteArray(format));

            if (reader && d->readItems(reader)) {

                delete reader;

                emit loaded();

                return;

            }

            delete reader;

        }

    }

    d->error = FormatNotSupportedError;

    d->errorString = tr("Playlist format is not supported");

    emit loadFailed();

    return;

}

/*!

  Load playlist from QIODevice \a device. If \a format is specified, it is used,

  otherwise format is guessed from device data.

  New items are appended to playlist.

  QMediaPlaylist::loaded() signal is emitted if playlist was loaded successfully,

  otherwise the playlist emits loadFailed().

*/

void QMediaPlaylist::load(QIODevice * device, const char *format)

{

    Q_D(QMediaPlaylist);

    d->error = NoError;

    d->errorString.clear();

    if (d->playlist()->load(device,format))

        return;

    if (isReadOnly()) {

        d->error = AccessDeniedError;

        d->errorString = tr("Could not add items to read only playlist.");

        emit loadFailed();

        return;

    }

    foreach (QString const& key, playlistIOLoader()->keys()) {

        QMediaPlaylistIOInterface* plugin = qobject_cast<QMediaPlaylistIOInterface*>(playlistIOLoader()->instance(key));

        if (plugin && plugin->canRead(device,format)) {

            QMediaPlaylistReader *reader = plugin->createReader(device,QByteArray(format));

            if (reader && d->readItems(reader)) {

                delete reader;

                emit loaded();

                return;

            }

            delete reader;

        }

    }

    d->error = FormatNotSupportedError;

    d->errorString = tr("Playlist format is not supported");

    emit loadFailed();

    return;

}