/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
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** Beta Release License Agreement.
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** additional rights. These rights are described in the Nokia Qt LGPL
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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
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#include "qfximagebase.h"
#include "qfximagebase_p.h"
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QFile>
#include <QtDeclarative/qmlengine.h>
#include <QtDeclarative/qfxpixmapcache.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->pendingPixmapCache)
        QFxPixmapCache::cancelGet(d->url, this);
}

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


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

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->pendingPixmapCache) {
        QFxPixmapCache::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;
        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;
        QNetworkReply *reply = QFxPixmapCache::get(qmlEngine(this), d->url, &d->pix);
        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
            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);

    d->pendingPixmapCache = false;

    if (!QFxPixmapCache::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);
    update();
}

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);
    }
}


QT_END_NAMESPACE