/*************************************************************************
 *  Copyright (C) 2008 by Volker Lanz <vl@fidra.de>                      *
 *                                                                       *
 *  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 3 of       *
 *  the License, or (at your option) any later version.                  *
 *                                                                       *
 *  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/>.*
 *************************************************************************/

#if !defined(KPMCORE_GLOBALLOG_H)

#define KPMCORE_GLOBALLOG_H

#include "util/libpartitionmanagerexport.h"

#include <QString>
#include <QObject>
#include <QtGlobal>

class LIBKPMCORE_EXPORT Log
{
public:
    enum class Level {
        debug,
        information,
        warning,
        error,
    };

public:
    Log(Level lev = Level::information) : ref(1), level(lev) {}
    ~Log();
    Log(const Log& other) : ref(other.ref + 1), level(other.level) {}

private:
    quint32 ref;
    Level level;
};

/** Global logging.
    @author Volker Lanz <vl@fidra.de>
*/
class LIBKPMCORE_EXPORT GlobalLog : public QObject
{
    Q_OBJECT
    Q_DISABLE_COPY(GlobalLog)

    friend class Log;
    friend Log operator<<(Log l, const QString& s);
    friend Log operator<<(Log l, qint64 i);

private:
    GlobalLog() : msg() {}

Q_SIGNALS:
    void newMessage(Log::Level, const QString&);

public:
    static GlobalLog* instance();

private:
    void append(const QString& s) {
        msg += s;
    }
    void flush(Log::Level level);

private:
    QString msg;
};

inline Log operator<<(Log l, const QString& s)
{
    GlobalLog::instance()->append(s);
    return l;
}

inline Log operator<<(Log l, qint64 i)
{
    GlobalLog::instance()->append(QString::number(i));
    return l;
}

#endif