/*
    This file is part of the Kasten Framework, made within the KDE community.

    Copyright 2008-2009,2011,2014 Friedrich W. H. Kossebau <kossebau@kde.org>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) version 3, or any
    later version accepted by the membership of KDE e.V. (or its
    successor approved by the membership of KDE e.V.), which shall
    act as a proxy defined in Section 6 of version 3 of the license.

    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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/

#include "abstractfilesystemloadjob_p.h"

// library
#include "abstractmodelfilesystemsynchronizer.h"
#include <abstractdocument.h>
// KF5
#include <KIO/FileCopyJob>
#include <KJobWidgets>
// Qt
#include <QFileInfo>
#include <QDateTime>
#include <QTemporaryFile>


namespace Kasten
{

void AbstractFileSystemLoadJobPrivate::load()
{
    Q_Q( AbstractFileSystemLoadJob );

    bool isWorkFileOk;

    if( mUrl.isLocalFile() )
    {
        // file protocol. We do not need the network
        mWorkFilePath = mUrl.toLocalFile();
        isWorkFileOk = true;
    } else {
        QTemporaryFile tmpFile;
        tmpFile.setAutoRemove( false );
        tmpFile.open();

        mWorkFilePath = tmpFile.fileName();
        mTempFilePath = mWorkFilePath;

        KIO::FileCopyJob* fileCopyJob =
            KIO::file_copy( mUrl, QUrl::fromLocalFile(mWorkFilePath), -1, KIO::Overwrite );
        KJobWidgets::setWindow( fileCopyJob, /*mWidget*/0 );

        isWorkFileOk = fileCopyJob->exec();
        if( ! isWorkFileOk )
            q->setErrorText( fileCopyJob->errorString() );
    }

    if( isWorkFileOk )
    {
        mFile = new QFile( mWorkFilePath );
        isWorkFileOk = mFile->open( QIODevice::ReadOnly );
        if( ! isWorkFileOk )
            q->setErrorText( mFile->errorString() );
    }

    if( isWorkFileOk )
        q->startLoadFromFile();
    else
    {
        q->setError( KJob::KilledJobError );
        // TODO: should we rather skip setDocument in the API?
        q->AbstractLoadJob::setDocument( 0 );
    }
}


void AbstractFileSystemLoadJobPrivate::setDocument( AbstractDocument* document )
{
    Q_Q( AbstractFileSystemLoadJob );

    if( document )
    {
        const bool isLocalFile = mUrl.isLocalFile();
        mFile->close(); // TODO: when is new time written, on close?

        // TODO: reading the fileinfo here separated from the content reading without a lock
        // asks for a race-condition to happen where the file is modified in between
        // TODO: how to handle remote+temp?
        QFileInfo fileInfo( *mFile );
        mSynchronizer->setFileDateTimeOnSync( fileInfo.lastModified() );
        mSynchronizer->setUrl( mUrl );
        if( isLocalFile )
            mSynchronizer->startFileWatching();
        else
            mSynchronizer->startNetworkWatching();
        mSynchronizer->setRemoteState( isLocalFile ? RemoteInSync : RemoteUnknown );

        document->setSynchronizer( mSynchronizer );
    }
    else
    {
        delete mSynchronizer;
    }

    delete mFile;

    if( ! mTempFilePath.isEmpty() )
        QFile::remove( mTempFilePath );

    q->AbstractLoadJob::setDocument( document );
}


}
