// Cyphesis Online RPG Server and AI Engine
// Copyright (C) 2008 Alistair Riddoch
//
// 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA


#ifndef COMMON_MONITORS_H
#define COMMON_MONITORS_H

#include <Atlas/Message/Element.h>
#include "Singleton.h"
#include "SynchedState.h"
#include <memory>
#include <mutex>

class VariableBase;

/// \brief Storage for monitor values to be exported
///
/// Any code can insert or update key value pairs here, and subsystems like
/// the http interface can access it.
class Monitors : public Singleton<Monitors> {
private:

	struct State {
		Atlas::Message::MapType pairs;
		std::map<std::string, std::unique_ptr<VariableBase>> variableMonitors;
	};
	SynchedState<State> mState;

public:
	Monitors();

	~Monitors() override;

	void insert(std::string, const Atlas::Message::Element&);

	void watch(std::string, std::unique_ptr<VariableBase>);

	void watch(std::string, int& value);

	void watch(std::string, long& value);

	void watch(std::string, float& value);

	void send(std::ostream&) const;

	void sendNumerics(std::ostream&) const;

	int readVariable(const std::string& key, std::ostream& out_stream) const;

};

#endif // COMMON_MONITORS_H
