/**********************************************************************************************
    Copyright (C) 2014-2016 Oliver Eichler <oliver.eichler@gmx.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/>.

**********************************************************************************************/

#ifndef CVALUE_H
#define CVALUE_H

#include <QSet>
#include <QVariant>
#include <functional>

using fMarkChanged = std::function<void(void)>;
using fValueOnChange = std::function<void(const QVariant&)>;

class CValue {
 public:
  CValue(const QString& cfgTag, const QVariant& initDefault, fMarkChanged markChanged,
         fValueOnChange onChange = nullptr);
  virtual ~CValue();

  enum mode_e { eModeSys, eModeUser };

  void setMode(mode_e m);
  mode_e getMode() const { return mode; }

  QVariant val() const;

  const QVariant& operator=(const QVariant& v);

 private:
  friend QDataStream& operator<<(QDataStream& stream, const CValue& v);
  friend QDataStream& operator>>(QDataStream& stream, CValue& v);

  void updateSys(const QString& tag, const QVariant& val);

  mode_e mode = eModeSys;
  QString cfgTag;
  QVariant initDefault;
  QVariant valUser;

  fValueOnChange funcOnChange;
  fMarkChanged funcMarkChanged;

  static QSet<CValue*> allValues;
};

#endif  // CVALUE_H
