/*
* ==============================================================================
*  Name        : SIPExSIPEngine.h
*  
* ==============================================================================
*/    

#ifndef _SIPEXSIPENGINE_H_
#define _SIPEXSIPENGINE_H_

// INCLUDES
#include <e32base.h>
#include <e32std.h>
#include <e32math.h>
#include <s32mem.h>
#include <in_sock.h>

#include <sip.h>
#include <sipdialog.h>
#include <sipobserver.h>
#include <sipinvitedialogassoc.h>
#include <sipconnectionobserver.h>
#include <sipservertransaction.h>
#include <sipmessageelements.h>
#include <siprequestelements.h>

#include <sdpdocument.h>
#include <sdpmediafield.h>
#include <sdporiginfield.h>
#include <sdpconnectionfield.h>
#include <sdpcodecstringconstants.h>
#include <sdpcodecstringpool.h>

#include <sipprofile.h>
#include <sipprofileregistry.h>
#include <sipprofileregistryobserver.h>

#include <sipaddress.h>
#include <sipcontenttypeheader.h>
#include <sipfromheader.h>

#include "SIPExSIPEngineObserver.h"

#include "SIPExSIPIdleState.h"
#include "SIPExSIPClientEstablishingState.h"
#include "SIPExSIPClientOfferingState.h"
#include "SIPExSIPServerOfferingState.h"
#include "SIPExSIPServerEstablishingState.h"
#include "SIPExSIPEstablishedState.h"
#include "SIPExSIPTerminatingState.h"


// FORWARD DECLARATIONS
class CSIP;
class CSIPDialog;
class CSIPServerTransaction;
class CSIPMessageElements;
class CSIPRequestElements;

class CSIPAddress;
class CSIPContentTypeHeader;
class CSIPFromHeader;

class MSIPExSIPEngineObserver;

class CSIPExSIPIdleState;
class CSIPExSIPClientEstablishingState;
class CSIPExSIPClientOfferingState;
class CSIPExSIPServerOfferingState;
class CSIPExSIPServerEstablishingState;
class CSIPExSIPEstablishedState;
class CSIPExSIPTerminatingState;


// CLASS DECLARATION

/**
* CSIPExSIPEngine
* Class for implementing the SIP Engine for the SIP
* Example Application. The Engine provides API functions
* for other parts of the Application, and maintains an
* internal state machine to handle the SIP session.
*/
class CSIPExSIPEngine: public CBase,
							   MSIPObserver,
							   MSIPConnectionObserver,
							   MSIPProfileRegistryObserver
	{

    public: // Constructors and destructor

		/**
		* NewL
		* Create new instance of SIP Engine.
		* @param aAppUid Application uid.
		* @param aObserver Pointer to the Engine Observer.
		* @return Pointer to new SIP Engine instance.
		*/
		IMPORT_C static CSIPExSIPEngine* NewL( TUid aAppUid,
												MSIPExSIPEngineObserver* aObserver );
		
		/**
		* Destructor.
		*/
		virtual ~CSIPExSIPEngine();
		
	private:
	
		/**
		* C++ default constructor.
		*/
		CSIPExSIPEngine();
		
		/**
		* 2nd phase construction.
		* @param aAppUid Application uid.
		* @param aObserver Pointer to the Engine Observer.
		*/
		void ConstructL( TUid aAppUid,
						 MSIPExSIPEngineObserver* aObserver );
		
	public:	// New functions - services provided by the SIP Engine

		/**
		* EnableProfileL
		* Enable the default profile.
		* Callback is notified when operation is complete.
		* Leaves if default SIP profile is not found or profile type is not expected.
		* Returns true if profile was registered immediately after enabling.
		*/
		IMPORT_C TBool EnableProfileL();
		
		/**
		* DisableProfile
		* Disable the current profile.
		* Callback is notified when operation is complete.
		*/
		IMPORT_C void DisableProfileL();
		
		
		/**
		* SendInvite
		* Create and send an INVITE to the recipient
		* identified by the parameter.
		* @param aSipUri Address of the recipient.
		*/
		IMPORT_C void SendInviteL( const TDesC8& aSipUri );
		
		
		/**
		* CancelInvite
		* CANCEL a previously sent INVITE. If a final
		* response for the INVITE has been sent, the
		* CANCEL request fails.
		*/
		IMPORT_C void CancelInviteL();


		/**
		* AcceptInvite
		* Send a 200 (OK) response to an INVITE sent
		* by a remote party.
		* @param aIPAddr local ip-address.
		*/
		IMPORT_C void AcceptInviteL(const TInetAddr& aIPAddr );


		/**
		* DeclineInvite
		* Send a 488 (Not Acceptable Here) response to
		* an INVITE sent by a remote party.
		*/
		IMPORT_C void DeclineInviteL();


		/**
		* EndSession
		* Terminate the SIP session by sending a BYE
		* request.
		*/
		IMPORT_C void EndSessionL();


		/**
		* CreateIML
		* Create an instant message and send it to the
		* remote party using the MESSAGE method.
		* @param aMessage The message to be sent.
		* @param aSipUri Address of the recipient.
		*/
		IMPORT_C void CreateIML( const TDesC8& aMessage,
							 	 const TDesC8& aSipUri );
							 	 

	public:		// State machine & internal functionality

		/**
		* IMReceivedL
		* An instant message has been received from the
		* network. Inform the observer.
		* @param aTransaction Contains message elements.
		* Ownership is transferred.
		*/
		void IMReceivedL( CSIPServerTransaction* aTransaction );


		/**
		* IMReceived
		* A non-leaving version of the IMReceivedL, the
		* possible errors are trapped.
		* @param aTransaction Contains message elements.
		* Ownership is transferred.
		*/
		void IMReceived( CSIPServerTransaction* aTransaction );


		/**
		* SetCurrentState
		* Sets the active state of the state machine.
		* @param aState The current state.
		*/
		void SetCurrentState( CSIPExSIPStateBase* aState );
		
    
		/**
		* Connection
		* Sets the active connection.
		*/
		CSIPConnection& ConnectionL();

		/**
		* Profile
		* Returns the enabled profile.
		*/
		CSIPProfile& Profile();

	
		/**
		* SetServerTx
		* Sets the current Server Transaction.
		* The ownership is transferred to the Engine.
		* @param aTx The transaction.
		*/
		void SetServerTx( CSIPServerTransaction* aTx );

		/**
		* ServerTx
		* Gets the current Server Transaction.
		*/
		CSIPServerTransaction& ServerTx();
		
		
		/**
		* SetClientTx
		* Sets the current Client Transaction.
		* The ownership is transferred to the Engine.
		* @param aTx The transaction.
		*/
		void SetClientTx( CSIPClientTransaction* aTx );
		
		/**
		* ClearClientTx
		* Deletes the current Client Transaction.
		*/
		void ClearClientTx();

		/**
		* ClientTx
		* Gets the current Client Transaction.
		*/
		CSIPClientTransaction& ClientTx();
		
		
		/**
		* SetDialogAssoc
		* Sets the current Invite Dialog Association.
		* @param aAssoc The Dialog Assoc.
		*/
		void SetDialogAssoc( CSIPInviteDialogAssoc& aAssoc );
		
		
		/**
		* DialogAssoc
		* Returns the current Invite Dialog Association.
		*/
		CSIPInviteDialogAssoc& DialogAssoc();

		
	public:		// Methods from base classes
	
// From MSIPObserver

		/**
		* IncomingRequest (from MSIPObserver)
		* A SIP request has been received from the network.		
		* @param aIapId The IapId from which
		*        the SIP request was received. 
		* @param aTransaction contains local address,
		*        remote address of a sip message,
		*        as well as optional SIP message method, headers and body.
		*        The ownership is transferred.        
        */

		void IncomingRequest( TUint32 aIapId,
							  CSIPServerTransaction* aTransaction );

		/**
		* TimedOut (from MSIPObserver)
		*/

		void TimedOut( CSIPServerTransaction& aSIPServerTransaction );
		
		
// From MSIPConnectionObserver

		/**
		* IncomingRequest (from MSIPConnectionObserver)
		* A SIP request outside a dialog has been received from the network.