// WMsgFrame.h: interface for the CWMsgPacket class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_WMSGFRAME_H__A49013A0_E397_45F7_BAC4_2D1B7FE06678__INCLUDED_)
#define AFX_WMSGFRAME_H__A49013A0_E397_45F7_BAC4_2D1B7FE06678__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

const int MAX_PHONE_NUMBER_LEN = 15;			// may has +86
const int MAX_SHORT_MSG_LEN = 160;				// 160 ASCII

const int MAX_ASCII_MSG_LEN_PER_PACKET = MAX_SHORT_MSG_LEN - 7;  // cf protocol 
const int MAX_ASCII_MSG_LEN_OF_LASTPACKET = MAX_ASCII_MSG_LEN_PER_PACKET - 1; // last packet will use one more byte than other packets

const int MAX_BIN_MSG_BODY_LEN_PER_PACKET = MAX_ASCII_MSG_LEN_PER_PACKET / 2;
const int MAX_BIN_MSG_BODY_LEN_OF_LASTPACKET = MAX_ASCII_MSG_LEN_OF_LASTPACKET / 2;

const BYTE MIN_FRAME_NO = 0x20;
const BYTE MAX_FRAME_NO = 0x7B;
const BYTE MIN_PACKET_NO = MIN_FRAME_NO;
const BYTE MAX_PACKET_NO = MAX_FRAME_NO;
const BYTE MAX_PACKETS_PER_FRAME = MAX_PACKET_NO - MIN_PACKET_NO + 1;
const BYTE MAX_FRAMES_PER_PHONE_NO = MAX_FRAME_NO - MIN_FRAME_NO + 1;

const int MAX_ASCII_MSG_LEN_PER_FRAME = MAX_ASCII_MSG_LEN_PER_PACKET * (MAX_PACKETS_PER_FRAME - 1) + 
										MAX_ASCII_MSG_LEN_OF_LASTPACKET; 

const int MAX_BIN_MSG_LEN_PER_FRAME = MAX_BIN_MSG_BODY_LEN_PER_PACKET * (MAX_PACKETS_PER_FRAME - 1) + 
									  MAX_BIN_MSG_BODY_LEN_OF_LASTPACKET;		

const BYTE FRAME_BEGIN_ID = 0x7D;
const BYTE FRAME_END_ID = 0X7E;
const BYTE LAST_PACKET_ID = 0X7C;
const BYTE PHONE_NUMBER_BEGIN = '\"';
const BYTE PHONE_NUMBER_END = PHONE_NUMBER_BEGIN; 

class CWMsgPacket  
{
public:
	
	// 參見：協議修改建議.txt

	enum MessageType
	{
	  // 以下命令類型由發送時指定
	  DASHI_MSG = '^',					// 0x5E ：  達示數據命令；正文為達示數據；
	  DIAODU_MSG_NEED_ANSWER =':',		// 0X3A：   調度命令，此條命令要求由司機確認；正文；
	  DIAODU_MSG_NEEDNOT_ANSWER = ';',	// 0X3B：   調度命令，此條命令不要求由司機確認；正文；

	  // 以下命令類型由發送程序處理，wParam調度信息ID, lParam為指向對應電話號碼的指針
	  ANSWER_FRAME_MSG = '\\',			// 0X5C：   此調度信息已經司機確認、由車載機回復。此時包號、幀號均為0X20，正文為四個字節的調度信息編號（見調度信息組織）；

	  // 以下命令類型全部由收發程序處理，與主界面無關
	  SEND_PACKET_AGAIN_MSG = '?',		//  0X3F：  車載機包數據接收錯誤，請求重發。此時幀號、包號為所接收錯誤幀的包號、幀號；正文無
	  SEND_FRAME_AGAIN_MSG = '['		//  0X5B：  車載機幀數據接收錯誤，請求重發。此時幀號為出錯的幀，包號為0X20，正文無；

	};

	CWMsgPacket();
	~CWMsgPacket();


	// for parser
	BOOL SetPhoneNumberBegin(BYTE toSet);
	BOOL SetPhoneNumberDigit(BYTE toSet);
	BOOL SetPhoneNumberEnd(BYTE toSet);

	BOOL SetFrameBegin(BYTE toSet);
	BOOL SetFrameNo(BYTE toSet);
	BOOL SetPacketNo(BYTE toSet);			// packet no or last packet flag
	BOOL SetLastPacketFlag(BYTE toSet);
	BOOL SetMessageType(BYTE toSet);
	BOOL AppendMsgTextOrCheckSum(BYTE toSet);

	BOOL SetFrameEnd(BYTE toSet);
	BOOL CheckCheckSum();
	void Reset();

	// for sender
	void GenerateMsgPacket(LPCSTR lpszPhoneNumber, BYTE msgType, BYTE frameNo, BYTE packetNo, const BYTE* lpBinData, DWORD dwDataSize, BOOL bLastPacket);
	const BYTE* GetDataAndSize(int& dataSize) const;		// data is in text format

	static BYTE PacketIndex2PacketNo(int idx);
	static int  PacketNo2PacketIndex(BYTE byNo);
	
	static BOOL IsValidPacketNo(BYTE byNo);
	static BOOL IsValidFrameNo(BYTE byNo);

	static BOOL IsValidMsgType(BYTE byType);
	static BOOL IsValidTextOrCheckSumByte(BYTE byData);
	static BOOL IsValidPhoneNumberDigit(BYTE byDigit);

	// 
	LPCSTR GetPhoneNumber() const;
	BYTE GetMessageType() const;
	int  GetMsgBinaryData(LPBYTE lpDest) const;		// return size of binary data
	BYTE GetFrameNo() const;
	BYTE GetPacketNo() const;
	BOOL IsLastPacket() const;

private:
	
	void AppendPhoneNumberDigit(BYTE byDigit);
	void AppendPacketByte(BYTE byData);
	void AppendCheckSum();				// for sender
	void ConvertAndAppend(const BYTE* lpBinData, int binDataSize);

	BYTE CalculateSum(int nBytes) const;

	char  m_szPhoneNumber[MAX_PHONE_NUMBER_LEN+1];	// to where
	int   m_numberDigitReceived;

	// ready for sent or received
	BYTE m_msgFrameData[MAX_SHORT_MSG_LEN];

	// for sender
	int  m_dataReceived;
	BOOL m_bLastPacket;
};


#endif // !defined(AFX_WMSGFRAME_H__A49013A0_E397_45F7_BAC4_2D1B7FE06678__INCLUDED_)