/******************************************************************************
 * Icinga 2                                                                   *
 * Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/)        *
 *                                                                            *
 * 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 ENDPOINTMANAGER_H
#define ENDPOINTMANAGER_H

namespace icinga
{

/**
 * Event arguments for the "new endpoint registered" event.
 *
 * @ingroup icinga
 */
struct I2_ICINGA_API NewEndpointEventArgs : public EventArgs
{
	icinga::Endpoint::Ptr Endpoint; /**< The new endpoint. */
};

struct NewResponseEventArgs;

/**
 * Information about a pending API request.
 *
 * @ingroup icinga
 */
struct I2_ICINGA_API PendingRequest
{
	time_t Timeout;
	RequestMessage Request;
	function<int(const NewResponseEventArgs&)> Callback;

	bool HasTimedOut(void) const
	{
		return time(NULL) > Timeout;
	}
};

/**
 * Event arguments for the "new response" event.
 *
 * @ingroup icinga
 */
struct I2_ICINGA_API NewResponseEventArgs : public EventArgs
{
	Endpoint::Ptr Sender;
	RequestMessage Request;
	ResponseMessage Response;
	bool TimedOut;
};

/**
 * Forwards messages between endpoints.
 *
 * @ingroup icinga
 */
class I2_ICINGA_API EndpointManager : public Object
{
public:
	typedef shared_ptr<EndpointManager> Ptr;
	typedef weak_ptr<EndpointManager> WeakPtr;

	EndpointManager(void)
		: m_NextMessageID(0)
	{ }

	void SetIdentity(string identity);
	string GetIdentity(void) const;

	void SetSSLContext(shared_ptr<SSL_CTX> sslContext);
	shared_ptr<SSL_CTX> GetSSLContext(void) const;

	void AddListener(string service);
	void AddConnection(string node, string service);

	void RegisterEndpoint(Endpoint::Ptr endpoint);
	void UnregisterEndpoint(Endpoint::Ptr endpoint);

	void SendUnicastMessage(Endpoint::Ptr sender, Endpoint::Ptr recipient, const MessagePart& message);
	void SendAnycastMessage(Endpoint::Ptr sender, const RequestMessage& message);
	void SendMulticastMessage(Endpoint::Ptr sender, const RequestMessage& message);

	void SendAPIMessage(Endpoint::Ptr sender, RequestMessage& message,
	    function<int(const NewResponseEventArgs&)> callback, time_t timeout = 10);

	void ProcessResponseMessage(const Endpoint::Ptr& sender, const ResponseMessage& message);

	void ForEachEndpoint(function<int (const NewEndpointEventArgs&)> callback);

	Endpoint::Ptr GetEndpointByIdentity(string identity) const;

	boost::signal<void (const NewEndpointEventArgs&)> OnNewEndpoint;

private:
	string m_Identity;
	shared_ptr<SSL_CTX> m_SSLContext;

	vector<JsonRpcServer::Ptr> m_Servers;
	vector<Endpoint::Ptr> m_Endpoints;

	long m_NextMessageID;
	map<string, PendingRequest> m_Requests;
	Timer::Ptr m_RequestTimer;

	void RegisterServer(JsonRpcServer::Ptr server);
	void UnregisterServer(JsonRpcServer::Ptr server);

	static bool RequestTimeoutLessComparer(const pair<string, PendingRequest>& a, const pair<string, PendingRequest>& b);
	void RescheduleRequestTimer(void);
	int RequestTimerHandler(const TimerEventArgs& ea);

	int NewClientHandler(const NewClientEventArgs& ncea);
};

}

#endif /* ENDPOINTMANAGER_H */