/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

#ifndef __SNTPCLIENTENGINE_H__

#define __SNTPCLIENTENGINE_H__

#include <e32base.h>

#include <es_sock.h>

#include <in_sock.h>

#include "commandlineargs.h"

enum TSNTPClientState {

	EStateIdle = 0,

	EStateResolve,

	EStateWrite,

	EStateRead,

	EStateComplete,

	EStateFailed,

	EStateAborted

	};

class MTimeOutNotify

	{

public:

	virtual void TimerExpired() = 0;

	};

// timeout handler

class CTimeOutTimer: public CTimer

	{

public:

	static CTimeOutTimer* NewL(const TInt aPriority, MTimeOutNotify& aTimeOutNotify);

	~CTimeOutTimer();

protected:

    CTimeOutTimer(const TInt aPriority);

	void ConstructL(MTimeOutNotify& aTimeOutNotify);

    virtual void RunL();

private:

	MTimeOutNotify* iNotify;

	};

// The main client engine

class CSNTPClient : public CActive, public MTimeOutNotify

	{

public:

	static CSNTPClient* NewL(TCommandLineArgs& aArgs);

	static CSNTPClient* NewLC(TCommandLineArgs& aArgs);

	TSNTPClientState State();

	void Start();

	~CSNTPClient();

private:

	CSNTPClient(TCommandLineArgs& aArgs);

	void ConstructL();

	/* CActive methods */

	void RunL();

	void DoCancel();

	TInt RunError(TInt aError);

	/* MTimeOutNotify methods */

	void TimerExpired();

	void SetTimeL(); 

private:

	RSocketServ	iSockServ;

	RSocket iSock;

	RHostResolver iResolver;

	TCommandLineArgs& iArgs;

	TSNTPClientState iState;

	TNameEntry iNameEntry;

	CTimeOutTimer* iTimer;

	// An NTP packet is exactly 48 bytes

	TBuf8<48> iBuffer;

	TInt iServerIndex;

	};

#endif /* _SNTPCLIENTENGINE_H__ */