/*
 * $Id$
 */

/*
 * Harbour Project source code:
 * Video subsystem for plain ANSI C stream IO
 *
 * Copyright 1999-2001 Viktor Szakats <viktor.szakats@syenar.hu>
 * www - http://www.harbour-project.org
 *
 * This program 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, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

/* NOTE: User programs should never call this layer directly! */

#define HB_GT_NAME      CGI

/*
 * HB_GT_CGI_RAWOUTPUT controls the behavior of GTCGI output
 * When not set GT driver output data in Refresh()/Redraw() methods
 * from super GT memory buffer - it causes that columns are wrapped
 * after last col.
 * It changes the previous behavior though it gives some improvements
 * like enabling DispBegin()/DispEnd() for output buffering.
 * If it's wrong and someone will prefer the old GTCGI behavior then
 * please uncomment HB_GT_CGI_RAWOUTPUT macro what will cause that
 * WriteCon(), Write(), WriteAt() method will be overload by GTCGI
 * and output data send directly without any buffering and line wrapping.
 */


#define HB_GT_CGI_RAWOUTPUT

#include "hbgtcore.h"
#include "hbinit.h"
#include "hbapifs.h"
#include "hbapicdp.h"
#include "hbdate.h"

static int           s_GtId;
static HB_GT_FUNCS   SuperTable;
#define HB_GTSUPER   (&SuperTable)
#define HB_GTID_PTR  (&s_GtId)

#define HB_GTCGI_GET(p) ( ( PHB_GTCGI ) HB_GTLOCAL( p ) )

typedef struct _HB_GTCGI
{
   FHANDLE        hStdout;
   int            iRow;
   int            iCol;
   int            iLastCol;
   int            iLineBufSize;
   BYTE *         sLineBuf;
   char *         szCrLf;
   ULONG          ulCrLf;
   BOOL           fDispTrans;
   PHB_CODEPAGE   cdpTerm;
   PHB_CODEPAGE   cdpHost;
} HB_GTCGI, * PHB_GTCGI;

static void hb_gt_cgi_termOut( PHB_GTCGI pGTCGI, const BYTE * pStr, ULONG ulLen )
{
   hb_fsWriteLarge( pGTCGI->hStdout, pStr, ulLen );
}

static void hb_gt_cgi_newLine( PHB_GTCGI pGTCGI )
{
   hb_gt_cgi_termOut( pGTCGI, ( BYTE * ) pGTCGI->szCrLf, pGTCGI->ulCrLf );
}

static void hb_gt_cgi_Init( PHB_GT pGT, FHANDLE hFilenoStdin, FHANDLE hFilenoStdout, FHANDLE hFilenoStderr )
{
   PHB_GTCGI pGTCGI;

   HB_TRACE( HB_TR_DEBUG, ( "hb_gt_cgi_Init(%p,%p,%p,%p)", pGT, hFilenoStdin, hFilenoStdout, hFilenoStderr ) );

   pGTCGI = ( PHB_GTCGI ) hb_xgrab( sizeof( HB_GTCGI ) );
   memset( pGTCGI, 0, sizeof( HB_GTCGI ) );
   HB_GTLOCAL( pGT ) = pGTCGI;

   pGTCGI->hStdout = hFilenoStdout;

   pGTCGI->szCrLf = hb_strdup( hb_conNewLine() );
   pGTCGI->ulCrLf = strlen( pGTCGI->szCrLf );

   hb_fsSetDevMode( pGTCGI->hStdout, FD_BINARY );

   HB_GTSUPER_INIT( pGT, hFilenoStdin, hFilenoStdout, hFilenoStderr );
   HB_GTSELF_SETFLAG( pGT, HB_GTI_STDOUTCON, TRUE );
}

static void hb_gt_cgi_Exit( PHB_GT pGT )
{
   PHB_GTCGI pGTCGI;

   HB_TRACE(HB_TR_DEBUG, ("hb_gt_cgi_Exit(%p)", pGT));

   HB_GTSELF_REFRESH( pGT );

   pGTCGI = HB_GTCGI_GET( pGT );

   HB_GTSUPER_EXIT( pGT );

   if( pGTCGI )
   {
      /* update cursor position on exit */
      if( pGTCGI->iLastCol > 0 )
         hb_gt_cgi_newLine( pGTCGI );

      if( pGTCGI->iLineBufSize > 0 )
         hb_xfree( pGTCGI->sLineBuf );
      if( pGTCGI->szCrLf )
         hb_xfree( pGTCGI->szCrLf );
      hb_xfree( pGTCGI );
   }
}

static int hb_gt_cgi_ReadKey( PHB_GT pGT, int iEventMask )
{
   HB_TRACE(HB_TR_DEBUG, ("hb_gt_cgi_ReadKey(%p,%d)", pGT, iEventMask));

   HB_SYMBOL_UNUSED( pGT );
   HB_SYMBOL_UNUSED( iEventMask );

   return 13;
}

static BOOL hb_gt_cgi_IsColor( PHB_GT pGT )
{
   HB_TRACE(HB_TR_DEBUG, ("hb_gt_cgi_IsColor(%p)", pGT));

   HB_SYMBOL_UNUSED( pGT );

   return FALSE;
}

static void hb_gt_cgi_Bell( PHB_GT pGT )
{
   static const BYTE s_szBell[] = { HB_CHAR_BEL, 0 };
   PHB_GTCGI pGTCGI;

   HB_TRACE(HB_TR_DEBUG, ("hb_gt_cgi_Bell(%p)", pGT));

   pGTCGI = HB_GTCGI_GET( pGT );

   hb_gt_cgi_termOut( pGTCGI, s_szBell, 1 );
}

static char * hb_gt_cgi_Version( PHB_GT pGT, int iType )
{
   HB_TRACE( HB_TR_DEBUG, ( "hb_gt_cgi_Version(%p,%d)", pGT, iType ) );

   HB_SYMBOL_UNUSED( pGT );

   if( iType == 0 )
      return HB_GT_DRVNAME( HB_GT_NAME );

   return "Harbour Terminal: Raw stream console";
}

static void hb_gt_cgi_Scroll( PHB_GT pGT, int iTop, int iLeft, int iBottom, int iRight,
                              BYTE bColor, BYTE bChar, int iRows, int iCols )
{
   int iHeight, iWidth;

   HB_TRACE( HB_TR_DEBUG, ( "hb_gt_cgi_Scroll(%p,%d,%d,%d,%d,%d,%d,%d,%d)", pGT, iTop, iLeft, iBottom, iRight, bColor, bChar, iRows, iCols ) );

   /* Provide some basic scroll support for full screen */
   HB_GTSELF_GETSIZE( pGT, &iHeight, &iWidth );
   if( iCols == 0 && iRows > 0 &&
       iTop == 0 && iLeft == 0 &&
       iBottom >= iHeight - 1 && iRight >= iWidth - 1 )
   {
      PHB_GTCGI pGTCGI = HB_GTCGI_GET( pGT );

      /* scroll up the internal screen buffer */
      HB_GTSELF_SCROLLUP( pGT, iRows, bColor, bChar );
      /* update our internal row position */
      pGTCGI->iRow -= iRows;
      if( pGTCGI->iRow < 0 )
         pGTCGI->iRow = 0;
      pGTCGI->iLastCol = pGTCGI->iCol = 0;
   }
   else
      HB_GTSUPER_SCROLL( pGT, iTop, iLeft, iBottom, iRight, bColor, bChar, iRows, iCols );
}

static BOOL hb_gt_cgi_SetDispCP( PHB_GT pGT, char *pszTermCDP, char *pszHostCDP, BOOL fBox )
{
   HB_TRACE( HB_TR_DEBUG, ( "hb_gt_cgi_SetDispCP(%p,%s,%s,%d)", pGT, pszTermCDP, pszHostCDP, (int) fBox ) );

   HB_GTSUPER_SETDISPCP( pGT, pszTermCDP, pszHostCDP, fBox );

#ifndef HB_CDP_SUPPORT_OFF
   if( !pszHostCDP )
      pszHostCDP = hb_cdp_page->id;
   if( !pszTermCDP )
      pszTermCDP = pszHostCDP;

   if( pszTermCDP && pszHostCDP )
   {
      PHB_GTCGI pGTCGI = HB_GTCGI_GET( pGT );

      pGTCGI->cdpTerm = hb_cdpFind( pszTermCDP );
      pGTCGI->cdpHost = hb_cdpFind( pszHostCDP );
      pGTCGI->fDispTrans = pGTCGI->cdpTerm && pGTCGI->cdpHost &&
                           pGTCGI->cdpTerm != pGTCGI->cdpHost;
      return TRUE;
   }
#endif

   return FALSE;
}

#ifdef HB_GT_CGI_RAWOUTPUT

static void hb_gt_cgi_WriteCon( PHB_GT pGT, BYTE * pText, ULONG ulLength )
{
   BYTE * buffer = NULL;
   PHB_GTCGI pGTCGI = HB_GTCGI_GET( pGT );

#ifndef HB_CDP_SUPPORT_OFF
   if( pGTCGI->fDispTrans )
   {
      buffer = ( BYTE * ) hb_xgrab( ulLength );
      memcpy( buffer, pText, ulLength );
      hb_cdpnTranslate( ( char * ) buffer, pGTCGI->cdpHost, pGTCGI->cdpTerm, ulLength );
      pText = buffer;
   }
#endif

   hb_gt_cgi_termOut( pGTCGI, pText, ulLength );
   while( ulLength-- )
   {
      switch( *pText++ )
      {
         case HB_CHAR_BEL:
            break;

         case HB_CHAR_BS:
            if( pGTCGI->iCol )
               pGTCGI->iCol--;
            break;

         case HB_CHAR_LF:
            pGTCGI->iRow++;
            break;

         case HB_CHAR_CR:
            pGTCGI->iCol = 0;
            break;

         default:
            ++pGTCGI->iCol;
      }
   }
   HB_GTSUPER_SETPOS( pGT, pGTCGI->iRow, pGTCGI->iCol );

   if( buffer )
      hb_xfree( buffer );
}

static void hb_gt_cgi_WriteAt( PHB_GT pGT, int iRow, int iCol, BYTE * pText, ULONG ulLength )
{
   int iLineFeed = 0, iSpace = 0;
   PHB_GTCGI pGTCGI = HB_GTCGI_GET( pGT );

   if( pGTCGI->iRow != iRow )
   {
      iLineFeed = pGTCGI->iRow < iRow ? iRow - pGTCGI->iRow : 1;
   }
   else if( pGTCGI->iCol > iCol )
   {
      iLineFeed = 1;
      iSpace = iCol;
   }
   else if( pGTCGI->iCol < iCol )
   {
      iSpace = iCol - pGTCGI->iCol;
   }

   if( iSpace > 0 )
   {
      BYTE * buffer = ( BYTE * ) hb_xgrab( iSpace );
      memset( buffer, ' ', iSpace );
      hb_gt_cgi_termOut( pGTCGI, buffer, iSpace );
      hb_xfree( buffer );
   }
   while( --iLineFeed >= 0 )
      hb_gt_cgi_newLine( pGTCGI );
   pGTCGI->iRow = iRow;
   pGTCGI->iCol = iCol;

   hb_gt_cgi_WriteCon( pGT, pText, ulLength );
}

#else /* HB_GT_CGI_RAWOUTPUT */

static void hb_gt_cgi_Redraw( PHB_GT pGT, int iRow, int iCol, int iSize )
{
   BYTE bColor, bAttr;
   USHORT usChar;
   int iLineFeed, iHeight, iWidth, iLen;
   PHB_GTCGI pGTCGI;

   HB_TRACE( HB_TR_DEBUG, ( "hb_gt_cgi_Redraw(%p,%d,%d,%d)", pGT, iRow, iCol, iSize ) );

   pGTCGI = HB_GTCGI_GET( pGT );
   HB_GTSELF_GETSIZE( pGT, &iHeight, &iWidth );
   iLineFeed = iLen = 0;

   if( pGTCGI->iRow != iRow )
   {
      iLineFeed = pGTCGI->iRow < iRow ? iRow - pGTCGI->iRow : 1;
      pGTCGI->iLastCol = pGTCGI->iCol = iCol = 0;
      iSize = iWidth;
   }
   else if( pGTCGI->iCol < iCol )
   {
      iSize += iCol - pGTCGI->iCol;
      iCol = pGTCGI->iCol;
   }
   else if( pGTCGI->iCol > iCol )
   {
      iLineFeed = 1;
      iCol = pGTCGI->iCol = pGTCGI->iLastCol = 0;
      iSize = iWidth;
   }

   while( iSize > 0 && iCol + iSize > pGTCGI->iLastCol &&
          HB_GTSELF_GETSCRCHAR( pGT, iRow, iCol + iSize - 1, &bColor, &bAttr, &usChar ) )
   {
      if( usChar != ' ' )
         break;
      --iSize;
   }

   if( iSize > 0 )
   {
      while( --iLineFeed >= 0 )
         hb_gt_cgi_newLine( pGTCGI );
      pGTCGI->iRow = iRow;

      while( iLen < iSize )
      {
         if( !HB_GTSELF_GETSCRCHAR( pGT, iRow, iCol, &bColor, &bAttr, &usChar ) )
            break;
         pGTCGI->sLineBuf[ iLen++ ] = ( BYTE ) usChar;
         ++iCol;
      }
      if( iLen )
      {
#ifndef HB_CDP_SUPPORT_OFF
         if( pGTCGI->fDispTrans )
            hb_cdpnTranslate( ( char * ) pGTCGI->sLineBuf, pGTCGI->cdpHost, pGTCGI->cdpTerm, iLen );
#endif
         hb_gt_cgi_termOut( pGTCGI, pGTCGI->sLineBuf, iLen );
         pGTCGI->iCol = iCol;
         if( pGTCGI->iCol > pGTCGI->iLastCol )
            pGTCGI->iLastCol = pGTCGI->iCol;
      }
   }
}

static void hb_gt_cgi_Refresh( PHB_GT pGT )
{
   int iHeight, iWidth;
   PHB_GTCGI pGTCGI;

   HB_TRACE( HB_TR_DEBUG, ( "hb_gt_cgi_Refresh(%p)", pGT ) );

   pGTCGI = HB_GTCGI_GET( pGT );
   HB_GTSELF_GETSIZE( pGT, &iHeight, &iWidth );
   if( pGTCGI->iLineBufSize == 0 )
   {
      pGTCGI->sLineBuf = ( BYTE * ) hb_xgrab( iWidth );
      pGTCGI->iLineBufSize = iWidth;
   }
   else if( pGTCGI->iLineBufSize < iWidth )
   {
      pGTCGI->sLineBuf = ( BYTE * ) hb_xrealloc( pGTCGI->sLineBuf, iWidth );
      pGTCGI->iLineBufSize = iWidth;
   }
   HB_GTSUPER_REFRESH( pGT );
}

#endif /* HB_GT_CGI_RAWOUTPUT */

/* *********************************************************************** */

static BOOL hb_gt_FuncInit( PHB_GT_FUNCS pFuncTable )
{
   HB_TRACE(HB_TR_DEBUG, ("hb_gt_FuncInit(%p)", pFuncTable));

   pFuncTable->Init                       = hb_gt_cgi_Init;
   pFuncTable->Exit                       = hb_gt_cgi_Exit;
   pFuncTable->IsColor                    = hb_gt_cgi_IsColor;
#ifdef HB_GT_CGI_RAWOUTPUT
   pFuncTable->WriteCon                   = hb_gt_cgi_WriteCon;
   pFuncTable->Write                      = hb_gt_cgi_WriteCon;
   pFuncTable->WriteAt                    = hb_gt_cgi_WriteAt;
#else
   pFuncTable->Redraw                     = hb_gt_cgi_Redraw;
   pFuncTable->Refresh                    = hb_gt_cgi_Refresh;
#endif
   pFuncTable->Scroll                     = hb_gt_cgi_Scroll;
   pFuncTable->Version                    = hb_gt_cgi_Version;
   pFuncTable->SetDispCP                  = hb_gt_cgi_SetDispCP;
   pFuncTable->Bell                       = hb_gt_cgi_Bell;

   pFuncTable->ReadKey                    = hb_gt_cgi_ReadKey;

   return TRUE;
}

/* ********************************************************************** */

static const HB_GT_INIT gtInit = { HB_GT_DRVNAME( HB_GT_NAME ),
                                   hb_gt_FuncInit,
                                   HB_GTSUPER,
                                   HB_GTID_PTR };

HB_GT_ANNOUNCE( HB_GT_NAME )

HB_CALL_ON_STARTUP_BEGIN( _hb_startup_gt_Init_ )
   hb_gtRegister( &gtInit );
HB_CALL_ON_STARTUP_END( _hb_startup_gt_Init_ )

#if defined( HB_PRAGMA_STARTUP )
   #pragma startup _hb_startup_gt_Init_
#elif defined(HB_MSC_STARTUP)
   #pragma data_seg( HB_MSC_START_SEGMENT )
   static HB_$INITSYM hb_vm_auto__hb_startup_gt_Init_ = _hb_startup_gt_Init_;
   #pragma data_seg()
#endif

/* *********************************************************************** */