/*
 * ast_h323.h
 *
 * OpenH323 Channel Driver for ASTERISK PBX.
 *			By Jeremy McNamara
 *                      For The NuFone Network 
 * 
 * This code has been derived from code created by
 *              Michael Manousos and Mark Spencer
 *
 * This file is part of the chan_h323 driver for Asterisk
 *
 * chan_h323 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. 
 *
 * chan_h323 is distributed 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., 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 * Version Info: $Id$ 
 */


#include <ptlib.h>
#include <h323.h>
#include <h323pdu.h>
#include <mediafmt.h>
#include <lid.h>

#include <list>
#include <string>
#include <algorithm>

#include "chan_h323.h"

/**  These need to be redefined here because the C++
	 side of this driver is blind to the asterisk headers */
	
/*! G.723.1 compression */
#define AST_FORMAT_G723_1	(1 << 0)
/*! GSM compression */
#define AST_FORMAT_GSM		(1 << 1)
/*! Raw mu-law data (G.711) */
#define AST_FORMAT_ULAW		(1 << 2)
/*! Raw A-law data (G.711) */
#define AST_FORMAT_ALAW		(1 << 3)
/*! MPEG-2 layer 3 */
#define AST_FORMAT_MP3		(1 << 4)
/*! ADPCM (whose?) */
#define AST_FORMAT_ADPCM	(1 << 5)
/*! Raw 16-bit Signed Linear (8000 Hz) PCM */
#define AST_FORMAT_SLINEAR	(1 << 6)
/*! LPC10, 180 samples/frame */
#define AST_FORMAT_LPC10	(1 << 7)
/*! G.729A audio */
#define AST_FORMAT_G729A	(1 << 8)
/*! SpeeX Free Compression */
#define AST_FORMAT_SPEEX	(1 << 9)
/*! ILBC Free Codec */
#define AST_FORMAT_ILBC         (1 << 10)

/**This class describes the G.723.1 codec capability.
 */
class H323_G7231Capability : public H323AudioCapability
{
    PCLASSINFO(H323_G7231Capability, H323AudioCapability);
  public:
    H323_G7231Capability(
      BOOL annexA = TRUE  /// Enable Annex A silence insertion descriptors
    );
    Comparison Compare(const PObject & obj) const;

    PObject * Clone() const;
  
	virtual H323Codec * CreateCodec(
      H323Codec::Direction direction  /// Direction in which this instance runs
    ) const;

	unsigned GetSubType() const;
    PString GetFormatName() const;
    BOOL OnSendingPDU(
      H245_AudioCapability & pdu,  /// PDU to set information on
      unsigned packetSize          /// Packet size to use in capability
    ) const;

    BOOL OnReceivedPDU(
      const H245_AudioCapability & pdu,  /// PDU to get information from
      unsigned & packetSize              /// Packet size to use in capability
    );
  
  protected:
    BOOL annexA;
};

/**This class describes the (fake) G729 codec capability.
 */
class AST_G729Capability : public H323AudioCapability
{
  PCLASSINFO(AST_G729Capability, H323AudioCapability);

  public:
  /**@name Construction */
  //@{
    /**Create a new G.729 capability.
     */
    AST_G729Capability();
  //@}

  /**@name Overrides from class PObject */
  //@{
    /**Create a copy of the object.
      */
    virtual PObject * Clone() const;
  //@}

  /**@name Operations */
  //@{
    /**Create the codec instance, allocating resources as required.
     */
    virtual H323Codec * CreateCodec(
      H323Codec::Direction direction  /// Direction in which this instance runs
    ) const;
  //@}

  /**@name Identification functions */
  //@{
    /**Get the sub-type of the capability. This is a code dependent on the
       main type of the capability.

       This returns one of the four possible combinations of mode and speed
       using the enum values of the protocol ASN H245_AudioCapability class.
     */
    virtual unsigned GetSubType() const;

    /**Get the name of the media data format this class represents.
     */
    virtual PString GetFormatName() const;
  //@}
};


/**This class describes the VoiceAge G729A codec capability.
 */
class AST_G729ACapability : public H323AudioCapability
{
  PCLASSINFO(AST_G729ACapability, H323AudioCapability);

  public:
  /**@name Construction */
  //@{
    /**Create a new G.729A capability.
     */
    AST_G729ACapability();
  //@}

  /**@name Overrides from class PObject */
  //@{
    /**Create a copy of the object.
      */
    virtual PObject * Clone() const;
  //@}

  /**@name Operations */
  //@{
    /**Create the codec instance, allocating resources as required.
     */
    virtual H323Codec * CreateCodec(
      H323Codec::Direction direction  /// Direction in which this instance runs
    ) const;
  //@}

  /**@name Identification functions */
  //@{
    /**Get the sub-type of the capability. This is a code dependent on the
       main type of the capability.

       This returns one of the four possible combinations of mode and speed
       using the enum values of the protocol ASN H245_AudioCapability class.
     */
    virtual unsigned GetSubType() const;

    /**Get the name of the media data format this class represents.
     */
    virtual PString GetFormatName() const;
  //@}
};


class MyH323EndPoint : public H323EndPoint {

	PCLASSINFO(MyH323EndPoint, H323EndPoint);

	public:

	int MakeCall(const PString &, PString &, unsigned int *, unsigned int, char *);
	BOOL ClearCall(const PString &);

	void OnClosedLogicalChannel(H323Connection &, const H323Channel &);
	void OnConnectionEstablished(H323Connection &, const PString &);
	void OnConnectionCleared(H323Connection &, const PString &);
	H323Connection * CreateConnection(unsigned, void *);
	void SendUserTone(const PString &, char);
	H323Capabilities GetCapabilities(void);
	BOOL OnConnectionForwarded(H323Connection &, const PString &, const H323SignalPDU &);
 
	BOOL ForwardConnection(H323Connection &, const PString &, const H323SignalPDU &);

	PStringArray SupportedPrefixes;	
	
    	void SetEndpointTypeInfo( H225_EndpointType & info ) const;
    	void SetGateway(void);
};

class MyH323Connection : public H323Connection {

	PCLASSINFO(MyH323Connection, H323Connection);

	public:
	MyH323Connection(MyH323EndPoint &, unsigned, unsigned);
	~MyH323Connection();

	H323Channel * CreateRealTimeLogicalChannel(const H323Capability &, H323Channel::Directions, unsigned, 
											   const H245_H2250LogicalChannelParameters *);
	H323Connection::AnswerCallResponse OnAnswerCall(const PString &, const H323SignalPDU &, H323SignalPDU &);
	void OnReceivedReleaseComplete(const H323SignalPDU &);
	BOOL OnAlerting(const H323SignalPDU &, const PString &);
	BOOL OnSendReleaseComplete(H323SignalPDU &);
	BOOL OnReceivedSignalSetup(const H323SignalPDU &);
	BOOL OnReceivedFacility(const H323SignalPDU &);
	BOOL OnSendSignalSetup(H323SignalPDU &);
	BOOL OnStartLogicalChannel(H323Channel &);
	BOOL OnClosingLogicalChannel(H323Channel &);	
	void SendUserInputTone(char, unsigned);
	void OnUserInputTone(char, unsigned, unsigned, unsigned);
	void OnUserInputString(const PString &value);

	PString sourceAliases;
	PString destAliases;
	PString sourceE164;
	PString destE164;

	PIPSocket::Address externalIpAddress;	// IP address of media server
    	PIPSocket::Address remoteIpAddress;		// IP Address of remote endpoint
	WORD			   externalPort;		// local media server Data port (control is dataPort+1)
	WORD			   remotePort;			// remote endpoint Data port (control is dataPort+1)
	WORD			   sessionId;
	BOOL			   bridging;			// Used to help determine which IP to use
};

/**
 * The MyProcess is a necessary descendant PProcess class so that the H323EndPoint 
 * objected to be created from within that class. (Who owns main() problem). 
 */
class MyProcess : public PProcess {

	PCLASSINFO(MyProcess, PProcess);
    
	public:
	MyProcess();

	void Main(); 
	
	
};