/*
Copyright_License {

  XCSoar Glide Computer - http://www.xcsoar.org/
  Copyright (C) 2000-2013 The XCSoar Project
  A detailed list of copyright holders can be found in the file "AUTHORS".

  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.

  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, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
}
*/

#ifndef XCSOAR_CONDITION_MONITOR_HPP
#define XCSOAR_CONDITION_MONITOR_HPP

#include "Math/fixed.hpp"

struct NMEAInfo;
struct DerivedInfo;
struct ComputerSettings;

/**
 * Base class for system to monitor changes in state and issue
 * warnings or informational messages based on various conditions.
 */
class ConditionMonitor
{
protected:
  fixed LastTime_Notification;
  fixed LastTime_Check;
  fixed Interval_Notification;
  fixed Interval_Check;

public:
  constexpr ConditionMonitor(unsigned _interval_notification,
                             unsigned _interval_check)
    :LastTime_Notification(-1), LastTime_Check(-1),
     Interval_Notification(_interval_notification),
     Interval_Check(_interval_check) {}

  void Update(const NMEAInfo &basic, const DerivedInfo &calculated,
              const ComputerSettings &settings);

private:
  virtual bool CheckCondition(const NMEAInfo &basic,
                              const DerivedInfo &calculated,
                              const ComputerSettings &settings) = 0;
  virtual void Notify() = 0;
  virtual void SaveLast() = 0;

  bool Ready_Time_Notification(fixed T);
  bool Ready_Time_Check(fixed T, bool *restart);
};

#endif
