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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    EasyMercurial

    Based on HgExplorer by Jari Korhonen
    Copyright (c) 2010 Jari Korhonen
    Copyright (c) 2012 Chris Cannam
    Copyright (c) 2012 Queen Mary, University of London
    
    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) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef _RECENT_FILES_H_
#define _RECENT_FILES_H_

#include <QObject>
#include <QString>
#include <QStringList>
#include <deque>

/**
 * RecentFiles manages a list of the names of recently-used objects,
 * saving and restoring that list via QSettings.  The names do not
 * actually have to refer to files.
 */

class RecentFiles : public QObject
{
    Q_OBJECT

public:
    /**
     * Construct a RecentFiles object that saves and restores in the
     * given QSettings group and truncates when the given count of
     * strings is reached.
     */
    RecentFiles(QString settingsGroup = "RecentFiles",
                size_t maxCount = 10,
                bool ignoreTemporaries = true);
    virtual ~RecentFiles();

    QString getSettingsGroup() const { return m_settingsGroup; }

    int getMaxCount() const { return m_maxCount; }

    QStringList getRecent() const;

    /**
     * Add a name that should be treated as a literal string.
     */
    void add(QString name);
    
    /**
     * Add a name that is known to be either a file path or a URL.  If
     * it looks like a URL, add it literally; otherwise treat it as a
     * file path and canonicalise it appropriately.  Also takes into
     * account the preference for whether to include temporary files
     * in the recent files menu: the file will not be added if the
     * preference is set and the file appears to be a temporary one.
     */
    void addFile(QString name);

signals:
    void recentChanged();

protected:
    QString m_settingsGroup;
    size_t m_maxCount;
    bool m_ignoreTemporaries;

    std::deque<QString> m_names;

    void read();
    void write();
    void truncateAndWrite();
};

#endif