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****************************************************************************/

#include "qmlgraphicsimagebase_p.h"
#include "qmlgraphicsimagebase_p_p.h"

#include <qmlengine.h>
#include <qmlpixmapcache_p.h>

#include <QFile>

QT_BEGIN_NAMESPACE

QmlGraphicsImageBase::QmlGraphicsImageBase(QmlGraphicsImageBasePrivate &dd, QmlGraphicsItem *parent)
  : QmlGraphicsItem(dd, parent)
{
    setFlag(QGraphicsItem::ItemHasNoContents, false);
}

QmlGraphicsImageBase::~QmlGraphicsImageBase()
{
    Q_D(QmlGraphicsImageBase);
    if (d->pendingPixmapCache)
        QmlPixmapCache::cancel(d->url, this);
}

QmlGraphicsImageBase::Status QmlGraphicsImageBase::status() const
{
    Q_D(const QmlGraphicsImageBase);
    return d->status;
}


qreal QmlGraphicsImageBase::progress() const
{
    Q_D(const QmlGraphicsImageBase);
    return d->progress;
}

QUrl QmlGraphicsImageBase::source() const
{
    Q_D(const QmlGraphicsImageBase);
    return d->url;
}

void QmlGraphicsImageBase::setSource(const QUrl &url)
{
    Q_D(QmlGraphicsImageBase);
    //equality is fairly expensive, so we bypass for simple, common case
    if ((d->url.isEmpty() == url.isEmpty()) && url == d->url)
        return;

    if (d->pendingPixmapCache) {
        QmlPixmapCache::cancel(d->url, this);
        d->pendingPixmapCache = false;
    }

    d->url = url;
    if (d->progress != 0.0) {
        d->progress = 0.0;
        emit progressChanged(d->progress);
    }

    if (url.isEmpty()) {
        d->pix = QPixmap();
        d->status = Null;
        setImplicitWidth(0);
        setImplicitHeight(0);
        emit statusChanged(d->status);
        emit sourceChanged(d->url);
        emit pixmapChanged();
        update();
    } else {
        d->status = Loading;
        QmlPixmapReply::Status status = QmlPixmapCache::get(d->url, &d->pix);
        if (status != QmlPixmapReply::Ready && status != QmlPixmapReply::Error) {
            QmlPixmapReply *reply = QmlPixmapCache::request(qmlEngine(this), d->url);
            d->pendingPixmapCache = true;

            static int replyDownloadProgress = -1;
            static int replyFinished = -1;
            static int thisRequestProgress = -1;
            static int thisRequestFinished = -1;
            if (replyDownloadProgress == -1) {
                replyDownloadProgress = 
                    QmlPixmapReply::staticMetaObject.indexOfSignal("downloadProgress(qint64,qint64)");
                replyFinished = 
                    QmlPixmapReply::staticMetaObject.indexOfSignal("finished()");
                thisRequestProgress = 
                    QmlGraphicsImageBase::staticMetaObject.indexOfSlot("requestProgress(qint64,qint64)");
                thisRequestFinished =
                    QmlGraphicsImageBase::staticMetaObject.indexOfSlot("requestFinished()");
            }

            QMetaObject::connect(reply, replyFinished, this, 
                                 thisRequestFinished, Qt::DirectConnection);
            QMetaObject::connect(reply, replyDownloadProgress, this, 
                                 thisRequestProgress, Qt::DirectConnection);
        } else {
            //### should be unified with requestFinished
            if (status == QmlPixmapReply::Ready) {
                setImplicitWidth(d->pix.width());
                setImplicitHeight(d->pix.height());

                if (d->status == Loading)
                    d->status = Ready;
            } else {
                d->status = Error;
            }
            d->progress = 1.0;
            emit statusChanged(d->status);
            emit sourceChanged(d->url);
            emit progressChanged(d->progress);
            emit pixmapChanged();
            update();
        }
    }

    emit statusChanged(d->status);
}

void QmlGraphicsImageBase::requestFinished()
{
    Q_D(QmlGraphicsImageBase);

    d->pendingPixmapCache = false;

    if (QmlPixmapCache::get(d->url, &d->pix) != QmlPixmapReply::Ready)
        d->status = Error;
    setImplicitWidth(d->pix.width());
    setImplicitHeight(d->pix.height());

    if (d->status == Loading)
        d->status = Ready;
    d->progress = 1.0;
    emit statusChanged(d->status);
    emit sourceChanged(d->url);
    emit progressChanged(1.0);
    emit pixmapChanged();
    update();
}

void QmlGraphicsImageBase::requestProgress(qint64 received, qint64 total)
{
    Q_D(QmlGraphicsImageBase);
    if (d->status == Loading && total > 0) {
        d->progress = qreal(received)/total;
        emit progressChanged(d->progress);
    }
}


QT_END_NAMESPACE