// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#include "qquickanimatedimage_p.h"
#include "qquickanimatedimage_p_p.h"

#include <QtGui/qguiapplication.h>
#include <QtQml/qqmlinfo.h>
#include <QtQml/qqmlfile.h>
#include <QtQml/qqmlengine.h>
#include <QtGui/qmovie.h>
#if QT_CONFIG(qml_network)
#include <QtNetwork/qnetworkrequest.h>
#include <QtNetwork/qnetworkreply.h>
#endif

QT_BEGIN_NAMESPACE

QQuickPixmap* QQuickAnimatedImagePrivate::infoForCurrentFrame(QQmlEngine *engine)
{
    if (!movie)
        return nullptr;

    int current = movie->currentFrameNumber();
    if (!frameMap.contains(current)) {
        QUrl requestedUrl;
        QQuickPixmap *pixmap = nullptr;
        if (engine && !movie->fileName().isEmpty()) {
            requestedUrl.setUrl(QString::fromUtf8("quickanimatedimage://%1#%2x%3#%4")
                                .arg(movie->fileName())
                                .arg(movie->scaledSize().width())
                                .arg(movie->scaledSize().height())
                                .arg(current));
        }
        if (!requestedUrl.isEmpty()) {
            if (QQuickPixmap::isCached(requestedUrl, QRect(), QSize(), 0, QQuickImageProviderOptions()))
                pixmap = new QQuickPixmap(engine, requestedUrl);
            else
                pixmap = new QQuickPixmap(requestedUrl, movie->currentImage());
        } else {
            pixmap = new QQuickPixmap;
            pixmap->setImage(movie->currentImage());
        }
        frameMap.insert(current, pixmap);
    }

    return frameMap.value(current);
}

void QQuickAnimatedImagePrivate::clearCache()
{
    qDeleteAll(frameMap);
    frameMap.clear();
}

/*!
    \qmltype AnimatedImage
    \instantiates QQuickAnimatedImage
    \inqmlmodule QtQuick
    \inherits Image
    \brief Plays animations stored as a series of images.
    \ingroup qtquick-visual

    The AnimatedImage type extends the features of the \l Image type, providing
    a way to play animations stored as images containing a series of frames,
    such as those stored in GIF files.

    Information about the current frame and total length of the animation can be
    obtained using the \l currentFrame and \l frameCount properties. You can
    start, pause and stop the animation by changing the values of the \l playing
    and \l paused properties.

    The full list of supported formats can be determined with QMovie::supportedFormats().

    \section1 Example Usage

    \beginfloatleft
    \image animatedimageitem.gif
    \endfloat

    The following QML shows how to display an animated image and obtain information
    about its state, such as the current frame and total number of frames.
    The result is an animated image with a simple progress indicator underneath it.

    \b Note: When animated images are cached, every frame of the animation will be cached.

    Set cache to false if you are playing a long or large animation and you
    want to conserve memory.

    If the image data comes from a sequential device (e.g. a socket),
    AnimatedImage can only loop if cache is set to true.

    \clearfloat
    \snippet qml/animatedimage.qml document

    \sa BorderImage, Image
*/

/*!
    \qmlproperty url QtQuick::AnimatedImage::source

    This property holds the URL that refers to the source image.

    AnimatedImage can handle any image format supported by Qt, loaded
    from any URL scheme supported by Qt. It is however not compatible
    with QQuickImageProvider.
*/

/*!
    \qmlproperty size QtQuick::AnimatedImage::sourceSize

    This property holds the scaled width and height of the full-frame image.

    Unlike the \l {Item::}{width} and \l {Item::}{height} properties, which scale
    the painting of the image, this property sets the maximum number of pixels
    stored for cached frames so that large animations do not use more
    memory than necessary.

    If the original size is larger than \c sourceSize, the image is scaled down.

    The natural size of the image can be restored by setting this property to
    \c undefined.

    \note \e {Changing this property dynamically causes the image source to be reloaded,
    potentially even from the network, if it is not in the disk cache.}

    \sa Image::sourceSize
*/
QQuickAnimatedImage::QQuickAnimatedImage(QQuickItem *parent)
    : QQuickImage(*(new QQuickAnimatedImagePrivate), parent)
{
    connect(this, &QQuickImageBase::cacheChanged, this, &QQuickAnimatedImage::onCacheChanged);
    connect(this, &QQuickImageBase::currentFrameChanged, this, &QQuickAnimatedImage::frameChanged);
    connect(this, &QQuickImageBase::currentFrameChanged, this, &QQuickAnimatedImage::currentFrameChanged);
    connect(this, &QQuickImageBase::frameCountChanged, this, &QQuickAnimatedImage::frameCountChanged);
}

QQuickAnimatedImage::~QQuickAnimatedImage()
{
    Q_D(QQuickAnimatedImage);
#if QT_CONFIG(qml_network)
    if (d->reply)
        d->reply->deleteLater();
#endif
    delete d->movie;
    d->clearCache();
}

/*!
  \qmlproperty bool QtQuick::AnimatedImage::paused
  This property holds whether the animated image is paused.

  By default, this property is false. Set it to true when you want to pause
  the animation.
*/

bool QQuickAnimatedImage::isPaused() const
{
    Q_D(const QQuickAnimatedImage);
    if (!d->movie)
        return d->paused;
    return d->movie->state()==QMovie::Paused;
}

void QQuickAnimatedImage::setPaused(bool pause)
{
    Q_D(QQuickAnimatedImage);
    if (pause == d->paused)
        return;
    if (!d->movie) {
        d->paused = pause;
        emit pausedChanged();
    } else {
        d->movie->setPaused(pause);
    }
}

/*!
  \qmlproperty bool QtQuick::AnimatedImage::playing
  This property holds whether the animated image is playing.

  By default, this property is true, meaning that the animation
  will start playing immediately.

  \b Note: this property is affected by changes to the actual playing
  state of AnimatedImage. If non-animated images are used, \a playing
  will need to be manually set to \a true in order to animate
  following images.
  \qml
  AnimatedImage {
      onStatusChanged: playing = (status == AnimatedImage.Ready)
  }
  \endqml
*/

bool QQuickAnimatedImage::isPlaying() const
{
    Q_D(const QQuickAnimatedImage);
    if (!d->movie)
        return d->playing;
    return d->movie->state()!=QMovie::NotRunning;
}

void QQuickAnimatedImage::setPlaying(bool play)
{
    Q_D(QQuickAnimatedImage);
    if (play == d->playing)
        return;
    if (!d->movie) {
        d->playing = play;
        emit playingChanged();
        return;
    }
    if (play)
        d->movie->start();
    else
        d->movie->stop();
}

/*!
  \qmlproperty int QtQuick::AnimatedImage::currentFrame
  \qmlproperty int QtQuick::AnimatedImage::frameCount

  currentFrame is the frame that is currently visible. By monitoring this property
  for changes, you can animate other items at the same time as the image.

  frameCount is the number of frames in the animation. For some animation formats,
  frameCount is unknown and has a value of zero.
*/
int QQuickAnimatedImage::currentFrame() const
{
    Q_D(const QQuickAnimatedImage);
    if (!d->movie)
        return d->presetCurrentFrame;
    return d->movie->currentFrameNumber();
}

void QQuickAnimatedImage::setCurrentFrame(int frame)
{
    Q_D(QQuickAnimatedImage);
    if (!d->movie) {
        d->presetCurrentFrame = frame;
        return;
    }
    d->movie->jumpToFrame(frame);
}

int QQuickAnimatedImage::frameCount() const
{
    Q_D(const QQuickAnimatedImage);
    if (!d->movie)
        return 0;
    return d->movie->frameCount();
}

/*!
    \qmlproperty real QtQuick::AnimatedImage::speed
    \since QtQuick 2.11

    This property holds the speed of the animation.

    The speed is measured in percentage of the original animated image speed.
    The default speed is 1.0 (original speed).
*/
qreal QQuickAnimatedImage::speed() const
{
    Q_D(const QQuickAnimatedImage);
    return d->speed;
}

void QQuickAnimatedImage::setSpeed(qreal speed)
{
    Q_D(QQuickAnimatedImage);
    if (d->speed != speed) {
        d->speed = speed;
        if (d->movie)
            d->movie->setSpeed(qRound(speed * 100.0));
        emit speedChanged();
    }
}

void QQuickAnimatedImage::setSource(const QUrl &url)
{
    Q_D(QQuickAnimatedImage);
    if (url == d->url)
        return;

#if QT_CONFIG(qml_network)
    if (d->reply) {
        d->reply->deleteLater();
        d->reply = nullptr;
    }
#endif

    d->setImage(QImage());
    d->oldPlaying = isPlaying();
    d->setMovie(nullptr);
    d->url = url;
    emit sourceChanged(d->url);

    if (isComponentComplete())
        load();
}

void QQuickAnimatedImage::load()
{
    Q_D(QQuickAnimatedImage);

    if (d->url.isEmpty()) {
        d->setProgress(0);

        d->setImage(QImage());
        if (sourceSize() != d->oldSourceSize) {
            d->oldSourceSize = sourceSize();
            emit sourceSizeChanged();
        }

        d->setStatus(Null);
        if (isPlaying() != d->oldPlaying)
            emit playingChanged();
    } else {
        const qreal targetDevicePixelRatio = (window() ? window()->effectiveDevicePixelRatio() : qApp->devicePixelRatio());
        d->devicePixelRatio = 1.0;

        const auto context = qmlContext(this);
        QUrl loadUrl = context ? context->resolvedUrl(d->url) : d->url;
        const QUrl resolvedUrl = loadUrl;
        resolve2xLocalFile(resolvedUrl, targetDevicePixelRatio, &loadUrl, &d->devicePixelRatio);
        QString lf = QQmlFile::urlToLocalFileOrQrc(loadUrl);

        d->status = Null; // reset status, no emit

        if (!lf.isEmpty()) {
            d->setMovie(new QMovie(lf));
            movieRequestFinished();
        } else {
#if QT_CONFIG(qml_network)
            if (d->reply)
                return;

            d->setStatus(Loading);
            d->setProgress(0);
            QNetworkRequest req(d->url);
            req.setAttribute(QNetworkRequest::HttpPipeliningAllowedAttribute, true);

            d->reply = qmlEngine(this)->networkAccessManager()->get(req);
            connect(d->reply, &QNetworkReply::finished, this, &QQuickAnimatedImage::movieRequestFinished);
            connect(d->reply, SIGNAL(downloadProgress(qint64,qint64)), this, SLOT(requestProgress(qint64,qint64)));
#endif
        }
    }
}

void QQuickAnimatedImage::movieRequestFinished()
{
    Q_D(QQuickAnimatedImage);

#if QT_CONFIG(qml_network)
    if (d->reply) {
        auto movie = new QMovie(d->reply);
        // From this point, we no longer need to handle the reply.
        // I.e. it will be used only as a data source for QMovie,
        // so it should live as long as the movie lives.
        d->reply->disconnect(this);
        d->reply->setParent(movie);
        d->reply = nullptr;

        d->setMovie(movie);
    }
#endif

    if (!d->movie || !d->movie->isValid()) {
        const QQmlContext *context = qmlContext(this);
        qmlWarning(this) << "Error Reading Animated Image File "
                         << (context ? context->resolvedUrl(d->url) : d->url).toString();
        d->setMovie(nullptr);

        d->setImage(QImage());
        if (sourceSize() != d->oldSourceSize) {
            d->oldSourceSize = sourceSize();
            emit sourceSizeChanged();
        }

        d->setProgress(0);
        d->setStatus(Error);

        if (isPlaying() != d->oldPlaying)
            emit playingChanged();
        return;
    }

    connect(d->movie, &QMovie::stateChanged, this, &QQuickAnimatedImage::playingStatusChanged);
    connect(d->movie, &QMovie::frameChanged, this, &QQuickAnimatedImage::movieUpdate);
    if (d->cache)
        d->movie->setCacheMode(QMovie::CacheAll);
    d->movie->setSpeed(qRound(d->speed * 100.0));

    d->setProgress(1);

    bool pausedAtStart = d->paused;
    if (d->movie && d->playing)
        d->movie->start();
    if (d->movie && pausedAtStart)
        d->movie->setPaused(true);
    if (d->movie && (d->paused || !d->playing)) {
        d->movie->jumpToFrame(d->presetCurrentFrame);
        d->presetCurrentFrame = 0;
    }

    QQuickPixmap *pixmap = d->infoForCurrentFrame(qmlEngine(this));
    if (pixmap) {
        d->setPixmap(*pixmap);
        if (sourceSize() != d->oldSourceSize) {
            d->oldSourceSize = sourceSize();
            emit sourceSizeChanged();
        }
    }

    d->setStatus(Ready);

    if (isPlaying() != d->oldPlaying)
        emit playingChanged();
}

void QQuickAnimatedImage::movieUpdate()
{
    Q_D(QQuickAnimatedImage);

    if (!d->cache)
        d->clearCache();

    if (d->movie) {
        d->setPixmap(*d->infoForCurrentFrame(qmlEngine(this)));
        emit QQuickImageBase::currentFrameChanged();
    }
}

void QQuickAnimatedImage::playingStatusChanged()
{
    Q_D(QQuickAnimatedImage);

    if ((d->movie->state() != QMovie::NotRunning) != d->playing) {
        d->playing = (d->movie->state() != QMovie::NotRunning);
        emit playingChanged();
    }
    if ((d->movie->state() == QMovie::Paused) != d->paused) {
        d->paused = (d->movie->state() == QMovie::Paused);
        emit pausedChanged();
    }
}

void QQuickAnimatedImage::onCacheChanged()
{
    Q_D(QQuickAnimatedImage);
    if (!cache()) {
        d->clearCache();
        if (d->movie)
            d->movie->setCacheMode(QMovie::CacheNone);
    } else {
        if (d->movie)
            d->movie->setCacheMode(QMovie::CacheAll);
    }
}

void QQuickAnimatedImage::componentComplete()
{
    QQuickItem::componentComplete(); // NOT QQuickImage
    load();
}

void QQuickAnimatedImagePrivate::setMovie(QMovie *m)
{
    if (movie == m)
        return;

    Q_Q(QQuickAnimatedImage);
    const int oldFrameCount = q->frameCount();

    if (movie) {
        movie->disconnect();
        movie->deleteLater();
    }

    movie = m;
    clearCache();

    if (movie)
        movie->setScaledSize(sourcesize);

    if (oldFrameCount != q->frameCount())
        emit q->frameCountChanged();
}

QT_END_NAMESPACE

#include "moc_qquickanimatedimage_p.cpp"
