/* Copyright 2009 Klarälvdalens Datakonsult AB

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 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 14 of version 3 of the license.

   This program 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 General Public License for more details.

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

#include "progressmanager.h"

#include "mailcommon_export.h"

#include <Akonadi/Collection>
#include <Akonadi/Item>
#include <kurl.h>
#include <qlist.h>

#include <qobject.h>
#include <qpointer.h>

class KArchive;
class KJob;
class QWidget;

namespace Akonadi {
  class ItemFetchJob;
}

namespace MailCommon
{

/**
 * Writes an entire folder structure to an archive file.
 * The archive is structured like a hierarchy of maildir folders. However, every type of folder
 * works as the source, i.e. also online IMAP folders.
 *
 * The job deletes itself after it finished.
 */
class  MAILCOMMON_EXPORT BackupJob : public QObject
{
  Q_OBJECT

  public:

    // These enum values have to stay in sync with the format combobox of ArchiveFolderDialog!
    enum ArchiveType { Zip = 0, Tar = 1, TarBz2 = 2, TarGz = 3 };

    explicit BackupJob( QWidget *parent = 0 );
    ~BackupJob();
    void setRootFolder( const Akonadi::Collection &rootFolder );
    void setSaveLocation( const KUrl& savePath );
    void setArchiveType( ArchiveType type );
    void setDeleteFoldersAfterCompletion( bool deleteThem );
    void setRecursive( bool recursive );
    void start();

  private slots:

    void itemFetchJobResult( KJob *job );
    void cancelJob();
    void archiveNextFolder();
    void onArchiveNextFolderDone( KJob *job );
    void archiveNextMessage();

  private:

    bool queueFolders( const Akonadi::Collection &root );
    void processMessage( const Akonadi::Item &item );
    QString pathForCollection( const Akonadi::Collection &collection ) const;
    QString subdirPathForCollection( const Akonadi::Collection &collection ) const;
    bool hasChildren( const Akonadi::Collection &collection ) const;
    void finish();
    void abort( const QString &errorMessage );
    bool writeDirHelper( const QString &directoryPath );

    // Helper function to return the name of the given collection.
    // Some Collection's don't have the name fetched. However, in mAllFolders,
    // we have a list of Collection's that have that information in them, so
    // we can just look it up there.
    QString collectionName( const Akonadi::Collection &collection ) const;

    KUrl mMailArchivePath;
    ArchiveType mArchiveType;
    Akonadi::Collection mRootFolder;
    KArchive *mArchive;
    QWidget *mParentWidget;
    int mArchivedMessages;
    uint mArchivedSize;
    QPointer<KPIM::ProgressItem> mProgressItem;
    bool mAborted;
    bool mDeleteFoldersAfterCompletion;
    bool mRecursive;

    Akonadi::Collection::List mPendingFolders;
    Akonadi::Collection::List mAllFolders;
    Akonadi::Collection mCurrentFolder;
    Akonadi::Item::List mPendingMessages;
    Akonadi::ItemFetchJob *mCurrentJob;
};

}

#endif
