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** This file is part of the QtDeclarative module of the Qt Toolkit.
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
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** packaging of this file.  Please review the following information to
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****************************************************************************/

#include "qfximagebase.h"
#include "qfximagebase_p.h"
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QFile>
#include <QtDeclarative/qmlengine.h>

QT_BEGIN_NAMESPACE

QFxImageBase::QFxImageBase(QFxItem *parent)
  : QFxItem(*(new QFxImageBasePrivate), parent)
{
    setFlag(QGraphicsItem::ItemHasNoContents, true);
}

QFxImageBase::QFxImageBase(QFxImageBasePrivate &dd, QFxItem *parent)
  : QFxItem(dd, parent)
{
    setFlag(QGraphicsItem::ItemHasNoContents, true);
}

QFxImageBase::~QFxImageBase()
{
    Q_D(QFxImageBase);
    if (d->sciReply)
        d->sciReply->deleteLater();
    if (!d->url.isEmpty())
        QFxPixmap::cancelGet(d->url, this);
    if (!d->sciurl.isEmpty())
        QFxPixmap::cancelGet(d->sciurl, this);
}

/*!
    \qmlproperty int Image::scaleGrid.left
    \qmlproperty int Image::scaleGrid.right
    \qmlproperty int Image::scaleGrid.top
    \qmlproperty int Image::scaleGrid.bottom

    \target ImagexmlpropertiesscaleGrid

    A scale grid uses 4 grid lines (2 horizontal and 2 vertical) to break an image into 9 sections, as shown below:

    \image declarative-scalegrid.png

    When the image is scaled:
    \list
    \i the corners (sections 1, 3, 7, and 9) are not scaled at all
    \i the middle (section 5) is scaled both horizontally and vertically
    \i sections 2 and 8 are scaled horizontally
    \i sections 4 and 6 are scaled vertically
    \endlist

    Each scale grid property (left, right, top, and bottom) specifies an offset from the respective side. For example, \c scaleGrid.bottom="10" sets the bottom scale grid line 10 pixels up from the bottom of the image.

    A scale grid can also be specified using a
    \l {Image::source}{.sci file}.
*/
QFxScaleGrid *QFxImageBase::scaleGrid()
{
    Q_D(QFxImageBase);
    return d->getScaleGrid();
}

void QFxImageBase::componentComplete()
{
    QFxItem::componentComplete();
}


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


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


/*!
    \property QFxImage::source
    \brief the url of the image to be displayed in this item.

    The content specified can be of any image type loadable by QImage. Alternatively,
    you can specify an sci format file, which specifies both an image and it's scale grid.
*/
QUrl QFxImageBase::source() const
{
    Q_D(const QFxImageBase);
    return d->url;
}

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

    if (d->sciReply) {
        d->sciReply->deleteLater();
        d->sciReply = 0;
    }

    if (!d->url.isEmpty())
        QFxPixmap::cancelGet(d->url, this);
    if (!d->sciurl.isEmpty())
        QFxPixmap::cancelGet(d->sciurl, this);

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

    if (url.isEmpty()) {
        d->pix = QPixmap();
        d->status = Null;
        d->progress = 1.0;
        setImplicitWidth(0);
        setImplicitHeight(0);
        emit statusChanged(d->status);
        emit sourceChanged(d->url);
        emit progressChanged(1.0);
        update();
    } else {
        d->status = Loading;
        if (d->url.path().endsWith(QLatin1String(".sci"))) {
#ifndef QT_NO_LOCALFILE_OPTIMIZED_QML
            if (d->url.scheme() == QLatin1String("file")) {
                QFile file(d->url.toLocalFile());
                file.open(QIODevice::ReadOnly);
                setGridScaledImage(QFxGridScaledImage(&file));
            } else
#endif
            {
                QNetworkRequest req(d->url);
                req.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferCache);
                d->sciReply = qmlEngine(this)->networkAccessManager()->get(req);
                QObject::connect(d->sciReply, SIGNAL(finished()),
                                 this, SLOT(sciRequestFinished()));
            }
        } else {
            d->reply = QFxPixmap::get(qmlEngine(this), d->url, &d->pix);
            if (d->reply) {
                connect(d->reply, SIGNAL(finished()), this, SLOT(requestFinished()));
                connect(d->reply, SIGNAL(downloadProgress(qint64,qint64)),
                        this, SLOT(requestProgress(qint64,qint64)));
            } else {
                //### should be unified with requestFinished
                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);
                update();
            }
        }
    }

    emit statusChanged(d->status);
}

void QFxImageBase::requestFinished()
{
    Q_D(QFxImageBase);
    if (d->url.path().endsWith(QLatin1String(".sci"))) {
        QFxPixmap::find(d->sciurl, &d->pix);
    } else {
        if (d->reply) {
            //###disconnect really needed?
            disconnect(d->reply, SIGNAL(downloadProgress(qint64,qint64)),
                       this, SLOT(requestProgress(qint64,qint64)));
            if (d->reply->error() != QNetworkReply::NoError)
                d->status = Error;
        }
        QFxPixmap::find(d->url, &d->pix);
    }
    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);
    update();
}

void QFxImageBase::sciRequestFinished()
{
    Q_D(QFxImageBase);
    if (d->sciReply->error() != QNetworkReply::NoError) {
        d->status = Error;
        d->sciReply->deleteLater();
        d->sciReply = 0;
        emit statusChanged(d->status);
    } else {
        QFxGridScaledImage sci(d->sciReply);
        d->sciReply->deleteLater();
        d->sciReply = 0;
        setGridScaledImage(sci);
    }
}

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

void QFxImageBase::setGridScaledImage(const QFxGridScaledImage& sci)
{
    Q_D(QFxImageBase);
    if (!sci.isValid()) {
        d->status = Error;
        emit statusChanged(d->status);
    } else {
        QFxScaleGrid *sg = scaleGrid();
        sg->setTop(sci.gridTop());
        sg->setBottom(sci.gridBottom());
        sg->setLeft(sci.gridLeft());
        sg->setRight(sci.gridRight());
        sg->setHorizontalTileRule(sci.horizontalTileRule());
        sg->setVerticalTileRule(sci.verticalTileRule());

        d->sciurl = d->url.resolved(QUrl(sci.pixmapUrl()));
        d->reply = QFxPixmap::get(qmlEngine(this), d->sciurl, &d->pix);
        if (d->reply) {
            connect(d->reply, SIGNAL(finished()), this, SLOT(requestFinished()));
            connect(d->reply, SIGNAL(downloadProgress(qint64,qint64)),
                    this, SLOT(requestProgress(qint64,qint64)));
        } else {
            //### should be unified with requestFinished
            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);
            update();
        }
    }
}

QT_END_NAMESPACE