
#ifndef __nsMsgBodyHandler_h
#define __nsMsgBodyHandler_h

#include "nsIMsgSearchScopeTerm.h"
#include "nsILineInputStream.h"
//---------------------------------------------------------------------------
// nsMsgBodyHandler: used to retrieve lines from POP and IMAP offline messages.
// This is a helper class used by nsMsgSearchTerm::MatchBody
//---------------------------------------------------------------------------
class nsMsgBodyHandler
{
public:
  nsMsgBodyHandler (nsIMsgSearchScopeTerm *,
    PRUint32 offset,
    PRUint32 length,
    nsIMsgDBHdr * msg,
    nsIMsgDatabase * db);
  
  // we can also create a body handler when doing arbitrary header
  // filtering...we need the list of headers and the header size as well
  // if we are doing filtering...if ForFilters is false, headers and
  // headersSize is ignored!!!
  nsMsgBodyHandler (nsIMsgSearchScopeTerm *, PRUint32 offset,
    PRUint32 length, nsIMsgDBHdr * msg, nsIMsgDatabase * db,
    const char * headers /* NULL terminated list of headers */,
    PRUint32 headersSize, PRBool ForFilters);
  
  virtual ~nsMsgBodyHandler();
  
  // returns next message line in buf
  PRInt32 GetNextLine(nsCString &buf);    
  
  // Transformations
  void SetStripHtml (PRBool strip) { m_stripHtml = strip; }
  void SetStripHeaders (PRBool strip) { m_stripHeaders = strip; }
  
protected:
  void Initialize();  // common initialization code
  
  // filter related methods. For filtering we always use the headers
  // list instead of the database...
  PRBool m_Filtering;
  PRInt32 GetNextFilterLine(nsCString &buf);
  // pointer into the headers list in the original message hdr db...
  const char * m_headers;  
  PRUint32 m_headersSize;
  PRUint32 m_headerBytesRead;
  
  // local / POP related methods
  void OpenLocalFolder();
  
  // goes through the mail folder 
  PRInt32 GetNextLocalLine(nsCString &buf); 

  nsIMsgSearchScopeTerm *m_scope;
  nsCOMPtr <nsILineInputStream> m_fileLineStream;
  nsCOMPtr <nsILocalFile> m_localFile;
  // local file state
  //	XP_File	*m_localFile;
  // need a file stream here, I bet
  
  // current offset into the mail folder file.
  PRInt32 m_localFileOffset;       
  PRUint32 m_numLocalLines;
  
  // Offline IMAP related methods & state
  
  
  nsIMsgDBHdr * m_msgHdr;
  nsIMsgDatabase * m_db;
  
  // Transformations
  PRBool m_stripHeaders;	// PR_TRUE if we're supposed to strip of message headers
  PRBool m_stripHtml;		// PR_TRUE if we're supposed to strip off HTML tags
  PRBool m_passedHeaders;	// PR_TRUE if we've already skipped over the headers
  PRBool m_messageIsHtml;	// PR_TRUE if the Content-type header claims text/html
  PRInt32 ApplyTransformations (nsCString &buf, PRInt32 length, PRBool &returnThisLine);
  void StripHtml (nsCString &buf);
};
#endif
