/******************************************************************************
 * Icinga 2                                                                   *
 * Copyright (C) 2012-2017 Icinga Development Team (https://www.icinga.com/)  *
 *                                                                            *
 * 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 St, Fifth Floor, Boston, MA 02110-1301, USA.             *
 ******************************************************************************/

#ifndef INFLUXDBWRITER_H
#define INFLUXDBWRITER_H

#include "perfdata/influxdbwriter.thpp"
#include "icinga/service.hpp"
#include "base/configobject.hpp"
#include "base/tcpsocket.hpp"
#include "base/timer.hpp"
#include "base/ringbuffer.hpp"
#include "base/workqueue.hpp"
#include <boost/thread/mutex.hpp>
#include <fstream>

namespace icinga
{

/**
 * An Icinga InfluxDB writer.
 *
 * @ingroup perfdata
 */
class InfluxdbWriter : public ObjectImpl<InfluxdbWriter>
{
public:
	DECLARE_OBJECT(InfluxdbWriter);
	DECLARE_OBJECTNAME(InfluxdbWriter);

	InfluxdbWriter(void);

	static void StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata);

	int GetTaskCount(RingBuffer::SizeType span) const;

	virtual void ValidateHostTemplate(const Dictionary::Ptr& value, const ValidationUtils& utils) override;
	virtual void ValidateServiceTemplate(const Dictionary::Ptr& value, const ValidationUtils& utils) override;

protected:
	virtual void OnConfigLoaded(void) override;
	virtual void Start(bool runtimeCreated) override;
	virtual void Stop(bool runtimeRemoved) override;

	void IncreaseTaskCount(void);

private:
	WorkQueue m_WorkQueue;
	Timer::Ptr m_FlushTimer;
	std::vector<String> m_DataBuffer;
	boost::mutex m_DataBufferMutex;

	mutable boost::mutex m_StatsMutex;
	RingBuffer m_TaskStats;
	int m_PendingTasks;
	double m_PendingTasksTimestamp;

	Timer::Ptr m_StatsLoggerTimer;
	void StatsLoggerTimerHandler(void);

	void CheckResultHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr);
	void SendPerfdata(const Dictionary::Ptr& tmpl, const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, double ts);
	void SendMetric(const Dictionary::Ptr& tmpl, const String& label, const Dictionary::Ptr& fields, double ts);
	void FlushTimeout(void);
	void Flush(void);

	void FlushHandler(const String& body);

	static String FormatInteger(int val);
	static String FormatBoolean(bool val);

	static String EscapeKey(const String& str);
	static String EscapeField(const String& str);

	Stream::Ptr Connect(TcpSocket::Ptr& socket);

	void AssertOnWorkQueue(void);

	void ExceptionHandler(boost::exception_ptr exp);
};

}

#endif /* INFLUXDBWRITER_H */