/*
    Copyright (C) 2012  Andras Mantia <amantia@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) 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
    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, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef KEYCACHE_H
#define KEYCACHE_H

/** @brief a cache for the maildir keys (file names in cur/new folders).
 *  It is used to find if a file is in cur or new
 */

#include <QSet>
#include <QHash>

class KeyCache
{

public:
    static KeyCache *self()
    {
        if (!mSelf) {
            mSelf = new KeyCache();
        }
        return mSelf;
    }

    /** Find the new and cur keys on the disk for @param dir and add them to the cache */
    void addKeys(const QString &dir);

    /** Refresh the new and cur keys for @param dir */
    void refreshKeys(const QString &dir);

    /** Add a "new" key for @param dir. */
    void addNewKey(const QString &dir, const QString &key);

    /** Add a "cur" key for @param dir. */
    void addCurKey(const QString &dir, const QString &key);

    /** Remove all keys associated with @param dir. */
    void removeKey(const QString &dir, const QString &key);

    /** Check if the @param key is a "cur" key in @param dir */
    bool isCurKey(const QString &dir, const QString &key) const;

    /** Check if the @param key is a "new" key in @param dir */
    bool isNewKey(const QString &dir, const QString &key) const;

private:
    KeyCache()
    {
    }

    QSet<QString> listNew(const QString &dir) const;

    QSet<QString> listCurrent(const QString &dir) const;

    QHash< QString, QSet<QString> > mNewKeys;
    QHash< QString, QSet<QString> > mCurKeys;

    static KeyCache *mSelf;

};

#endif // KEYCACHE_H
