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 /* This file is part of the KDE project
  * Copyright (C) 2007, 2009 Thomas Zander <zander@kde.org>
  * Copyright (C) 2008 Thorsten Zachmann <zachmann@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 #include "KoImageCollection.h"
 #include "KoImageData.h"
 #include "KoImageData_p.h"
 #include "KoShapeSavingContext.h"
 
 #include <KoStoreDevice.h>
 #include <QCryptographicHash>
 #include <KoXmlWriter.h>
 
 #include <QMap>
 #include <FlakeDebug.h>
 #include <QMimeDatabase>
 #include <QMimeType>
 
 
 class Q_DECL_HIDDEN KoImageCollection::Private
 {
 public:
     ~Private()
     {
         foreach(KoImageDataPrivate *id, images)
             id->collection = 0;
     }
 
     QMap<qint64, KoImageDataPrivate*> images;
     // an extra map to find all dataObjects based on the key of a store.
     QMap<QByteArray, KoImageDataPrivate*> storeImages;
 };
 
 KoImageCollection::KoImageCollection(QObject *parent)
     : QObject(parent),
     d(new Private())
 {
 }
 
 KoImageCollection::~KoImageCollection()
 {
     delete d;
 }
 
 bool KoImageCollection::completeLoading(KoStore *store)
 {
     Q_UNUSED(store);
     d->storeImages.clear();
     return true;
 }
 
 bool KoImageCollection::completeSaving(KoStore *store, KoXmlWriter *manifestWriter, KoShapeSavingContext *context)
 {
     const QMap<qint64, QString> imagesToSave(context->imagesToSave());
     QMap<qint64, QString>::ConstIterator imagesToSaveIter(imagesToSave.begin());
 
     QMap<qint64, KoImageDataPrivate *>::ConstIterator knownImagesIter(d->images.constBegin());
 
     while (imagesToSaveIter != imagesToSave.constEnd()) {
         if (knownImagesIter == d->images.constEnd()) {
             // this should not happen
             warnFlake << "image not found";
             Q_ASSERT(0);
             break;
         }
         else if (knownImagesIter.key() == imagesToSaveIter.key()) {
             KoImageDataPrivate *imageData = knownImagesIter.value();
             if (store->open(imagesToSaveIter.value())) {
                 KoStoreDevice device(store);
                 bool ok = imageData->saveData(device);
                 store->close();
                 // TODO error handling
                 if (ok) {
                     QMimeDatabase db;
                     const QString mimetype(db.mimeTypeForFile(imagesToSaveIter.value(), QMimeDatabase::MatchExtension).name());
                     manifestWriter->addManifestEntry(imagesToSaveIter.value(), mimetype);
                 } else {
                     warnFlake << "saving image" << imagesToSaveIter.value() << "failed";
                 }
             } else {
                 warnFlake << "saving image failed: open store failed";
             }
             ++knownImagesIter;
             ++imagesToSaveIter;
         } else if (knownImagesIter.key() < imagesToSaveIter.key()) {
             ++knownImagesIter;
         } else {
             // this should not happen
             warnFlake << "image not found";
             abort();
             Q_ASSERT(0);
         }
     }
     return true;
 }
 
 KoImageData *KoImageCollection::createImageData(const QImage &image)
 {
     Q_ASSERT(!image.isNull());
     KoImageData *data = new KoImageData();
     data->setImage(image);
 
     data = cacheImage(data);
     return data;
 }
 
 KoImageData *KoImageCollection::createImageData(const QString &href, KoStore *store)
 {
     // the tricky thing with a 'store' is that we need to read the data now
     // as the store will no longer be readable after the loading completed.
     //
     // The solution we use is to read the data, store it in a QTemporaryFile
     // and read and parse it on demand when the image data is actually needed.
     // This leads to having two keys, one for the store and one for the
     // actual image data. We need the latter so if someone else gets the same
     // image data they can find this data and share (insert warm fuzzy feeling here).
     //
     QByteArray storeKey = (QString::number((qint64) store) + href).toLatin1();
     if (d->storeImages.contains(storeKey))
         return new KoImageData(d->storeImages.value(storeKey));
 
     KoImageData *data = new KoImageData();
     data->setImage(href, store);
 
     data = cacheImage(data);
     d->storeImages.insert(storeKey, data->priv());
     return data;
 }
 
 KoImageData *KoImageCollection::createImageData(const QByteArray &imageData)
 {
     QCryptographicHash md5(QCryptographicHash::Md5);
     md5.addData(imageData);
     qint64 key = KoImageDataPrivate::generateKey(md5.result());
     if (d->images.contains(key))
         return new KoImageData(d->images.value(key));
     KoImageData *data = new KoImageData();
     data->setImage(imageData);
     data->priv()->collection = this;
     Q_ASSERT(data->key() == key);
     d->images.insert(key, data->priv());
     return data;
 }
 
 KoImageData *KoImageCollection::cacheImage(KoImageData *data)
 {
     QMap<qint64, KoImageDataPrivate*>::const_iterator it(d->images.constFind(data->key()));
     if (it == d->images.constEnd()) {
         d->images.insert(data->key(), data->priv());
         data->priv()->collection = this;
     }
     else {
         delete data;
         data = new KoImageData(it.value());
     }
     return data;
 }
 
 bool KoImageCollection::fillFromKey(KoImageData &idata, qint64 key)
 {
     if (d->images.contains(key)) {
         idata = KoImageData(d->images.value(key));
         return true;
     }
     return false;
 }
 
 int KoImageCollection::size() const
 {
     return d->images.count();
 }
 
 int KoImageCollection::count() const
 {
     return d->images.count();
 }
 
 void KoImageCollection::update(qint64 oldKey, qint64 newKey)
 {
     if (oldKey == newKey) {
         return;
     }
     if (d->images.contains(oldKey)) {
         KoImageDataPrivate *imageData = d->images[oldKey];
         d->images.remove(oldKey);
         d->images.insert(newKey, imageData);
     }
 }
 
 void KoImageCollection::removeOnKey(qint64 imageDataKey)
 {
     d->images.remove(imageDataKey);
 }