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

#include "qmlgraphicsimagebase_p.h"
#include "qmlgraphicsimagebase_p_p.h"
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QFile>
#include <qmlengine.h>
#include <private/qmlpixmapcache_p.h>

QT_BEGIN_NAMESPACE

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

QmlGraphicsImageBase::~QmlGraphicsImageBase()
{
    Q_D(QmlGraphicsImageBase);
    if (d->pendingPixmapCache)
        QmlPixmapCache::cancelGet(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::cancelGet(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;
        bool ok = true;
        QNetworkReply *reply = QmlPixmapCache::get(qmlEngine(this), d->url, &d->pix, &ok);
        if (reply) {
            d->pendingPixmapCache = true;
            connect(reply, SIGNAL(finished()), this, SLOT(requestFinished()));
            connect(reply, SIGNAL(downloadProgress(qint64,qint64)),
                    this, SLOT(requestProgress(qint64,qint64)));
        } else {
            //### should be unified with requestFinished
            if (ok) {
                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::find(d->url, &d->pix))
        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