/*
 * $Id$
 */

/*
 * Postgre SQL Database Driver
 *
 * Copyright 2007 Mindaugas Kavaliauskas <dbtopas at dbtopas.lt>
 * www - http://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.
 *
 */


#include "hbapi.h"
#include "hbapiitm.h"
#include "hbvm.h"

#include "hbrddsql.h"

#include "libpq-fe.h"

/* TOFIX: these are defined in "server/catalog/pg_type.h",
   but including this file generates compile errors.
-Ic:/pgsql/include;c:/pgsql/include/server
#include "postgres.h"
#include "catalog/pg_type.h"
*/

#define BOOLOID                 16
#define BYTEAOID                17
#define CHAROID                 18
#define INT8OID                 20
#define INT2OID                 21
#define INT4OID                 23
#define TEXTOID                 25
#define OIDOID                  26
#define CIDROID                650
#define FLOAT4OID              700
#define FLOAT8OID              701
#define CASHOID                790
#define MACADDROID             829
#define INETOID                869
#define BPCHAROID             1042
#define VARCHAROID            1043
#define DATEOID               1082
#define TIMEOID               1083
#define TIMESTAMPOID          1114
#define TIMESTAMPTZOID        1184
#define TIMETZOID             1266
#define BITOID                1560
#define VARBITOID             1562
#define NUMERICOID            1700

typedef struct
{
   PGconn * pConn;
} SDDCONN;

typedef struct
{
   PGresult * pResult;
} SDDDATA;


static HB_ERRCODE pgsqlConnect( SQLDDCONNECTION * pConnection, PHB_ITEM pItem );
static HB_ERRCODE pgsqlDisconnect( SQLDDCONNECTION * pConnection );
static HB_ERRCODE pgsqlExecute( SQLDDCONNECTION * pConnection, PHB_ITEM pItem );
static HB_ERRCODE pgsqlOpen( SQLBASEAREAP pArea );
static HB_ERRCODE pgsqlClose( SQLBASEAREAP pArea );
static HB_ERRCODE pgsqlGetValue( SQLBASEAREAP pArea, HB_USHORT uiIndex, PHB_ITEM pItem );


static SDDNODE pgsqldd = {
   NULL,
   "POSTGRESQL",
   ( SDDFUNC_CONNECT )    pgsqlConnect,
   ( SDDFUNC_DISCONNECT ) pgsqlDisconnect,
   ( SDDFUNC_EXECUTE )    pgsqlExecute,
   ( SDDFUNC_OPEN )       pgsqlOpen,
   ( SDDFUNC_CLOSE )      pgsqlClose,
   ( SDDFUNC_GOTO )       NULL,
   ( SDDFUNC_GETVALUE )   pgsqlGetValue,
   ( SDDFUNC_GETVARLEN )  NULL
};


HB_FUNC_EXTERN( SQLBASE );

static void hb_pgsqldd_init( void * cargo )
{
   HB_SYMBOL_UNUSED( cargo );

   if ( ! hb_sddRegister( & pgsqldd ) )
   {
      hb_errInternal( HB_EI_RDDINVALID, NULL, NULL, NULL );
      HB_FUNC_EXEC( SQLBASE );   /*  force SQLBASE linking */
   }
}

HB_FUNC( SDDPG ) {;}

HB_INIT_SYMBOLS_BEGIN( sddpostgre__InitSymbols )
{ "SDDPG", {HB_FS_PUBLIC|HB_FS_LOCAL}, {HB_FUNCNAME( SDDPG )}, NULL },
HB_INIT_SYMBOLS_END( sddpostgre__InitSymbols )

HB_CALL_ON_STARTUP_BEGIN( _hb_sddpostgre_init_ )
   hb_vmAtInit( hb_pgsqldd_init, NULL );
HB_CALL_ON_STARTUP_END( _hb_sddpostgre_init_ )

#if defined( HB_PRAGMA_STARTUP )
   #pragma startup sddpostgre__InitSymbols
   #pragma startup _hb_sddpostgre_init_
#elif defined( HB_DATASEG_STARTUP )
   #define HB_DATASEG_BODY    HB_DATASEG_FUNC( sddpostgre__InitSymbols ) \
                              HB_DATASEG_FUNC( _hb_sddpostgre_init_ )
   #include "hbiniseg.h"
#endif


/* ===================================================================================== */
static HB_USHORT hb_errRT_PostgreSQLDD( HB_ERRCODE errGenCode, HB_ERRCODE errSubCode, const char * szDescription, const char * szOperation, HB_ERRCODE errOsCode )
{
   HB_USHORT uiAction;
   PHB_ITEM pError;

   pError = hb_errRT_New( ES_ERROR, "SDDPG", errGenCode, errSubCode, szDescription, szOperation, errOsCode, EF_NONE );
   uiAction = hb_errLaunch( pError );
   hb_itemRelease( pError );
   return uiAction;
}


/* ============= SDD METHODS ============================================================= */

static HB_ERRCODE pgsqlConnect( SQLDDCONNECTION * pConnection, PHB_ITEM pItem )
{
   PGconn *         pConn;
   ConnStatusType   status;

   pConn = PQsetdbLogin( hb_arrayGetCPtr( pItem, 2 ), NULL, NULL, NULL, hb_arrayGetCPtr( pItem, 5 ), hb_arrayGetCPtr( pItem, 3 ), hb_arrayGetCPtr( pItem, 4 ) );

   if ( ! pConn )  /* Low memory, etc */
   {
      /* TODO: error */
      return HB_FAILURE;
   }
   status = PQstatus( pConn );
   if ( status != CONNECTION_OK )
   {
      /* TODO: error */
      PQfinish( pConn );
      return HB_FAILURE;
   }
   pConnection->pSDDConn = hb_xgrab( sizeof( SDDCONN ) );
   ( ( SDDCONN * ) pConnection->pSDDConn )->pConn = pConn;
   return HB_SUCCESS;
}


static HB_ERRCODE pgsqlDisconnect( SQLDDCONNECTION * pConnection )
{
   PQfinish( ( ( SDDCONN * ) pConnection->pSDDConn )->pConn );
   hb_xfree( pConnection->pSDDConn );
   return HB_SUCCESS;
}


static HB_ERRCODE pgsqlExecute( SQLDDCONNECTION * pConnection, PHB_ITEM pItem )
{
   PGconn *       pConn = ( ( SDDCONN * ) pConnection->pSDDConn )->pConn;
   int            iTuples;
   PGresult *     pResult;
   ExecStatusType status;
   unsigned long  ulAffectedRows;

   pResult = PQexec( pConn, hb_itemGetCPtr( pItem ) );
   if ( ! pResult )
   {
      hb_rddsqlSetError( 1, PQerrorMessage( pConn ), hb_itemGetCPtr( pItem ), NULL, 0 );
      return HB_FAILURE;
   }

   status = PQresultStatus( pResult );
   if ( status != PGRES_TUPLES_OK && status != PGRES_COMMAND_OK )
   {
      hb_rddsqlSetError( status, PQresultErrorMessage( pResult ), hb_itemGetCPtr( pItem ), NULL, 0 );
      return HB_FAILURE;
   }

   iTuples = PQntuples( pResult );
   if ( iTuples > 0 )
      ulAffectedRows = ( unsigned long ) iTuples;
   else
      ulAffectedRows = ( unsigned long ) atol( PQcmdTuples( pResult ) );

   hb_rddsqlSetError( 0, NULL, hb_itemGetCPtr( pItem ), NULL, ulAffectedRows );
   PQclear( pResult );
   return HB_SUCCESS;
}


static HB_ERRCODE pgsqlOpen( SQLBASEAREAP pArea )
{
   PGconn *        pConn = ( ( SDDCONN * ) pArea->pConnection->pSDDConn )->pConn;
   SDDDATA *       pSDDData;
   PGresult *      pResult;
   ExecStatusType  status;
   PHB_ITEM        pItemEof, pItem;
   HB_USHORT       uiFields, uiCount;
   HB_BOOL         bError;
   char*           pBuffer;
   DBFIELDINFO     pFieldInfo;

   pArea->pSDDData = memset( hb_xgrab( sizeof( SDDDATA ) ), 0, sizeof( SDDDATA ) );
   pSDDData = ( SDDDATA * ) pArea->pSDDData;

   pResult = PQexec( pConn, pArea->szQuery );
   if ( ! pResult )
   {
      hb_errRT_PostgreSQLDD( EG_OPEN, ESQLDD_LOWMEMORY, "Query failed", NULL, 0 );  /* Low memory, etc */
      return HB_FAILURE;
   }

   status = PQresultStatus( pResult );
   if ( status != PGRES_TUPLES_OK && status != PGRES_COMMAND_OK )
   {
      hb_errRT_PostgreSQLDD( EG_OPEN, ESQLDD_INVALIDQUERY, PQresultErrorMessage( pResult ), pArea->szQuery, ( HB_ERRCODE ) status );
      PQclear( pResult );
      return HB_FAILURE;
   }

   pSDDData->pResult = pResult;

   uiFields = ( HB_USHORT ) PQnfields( pResult );
   SELF_SETFIELDEXTENT( ( AREAP ) pArea, uiFields );

   pItemEof = hb_itemArrayNew( uiFields );

   pBuffer = ( char* ) hb_xgrab( 256 );

   bError = HB_FALSE;
   for ( uiCount = 0; uiCount < uiFields; uiCount++  )
   {
      hb_strncpy( pBuffer, PQfname( pResult, ( int ) uiCount ), 256 - 1 );
      hb_strUpper( pBuffer, MAX_FIELD_NAME + 1 );
      pBuffer[ MAX_FIELD_NAME ] = '\0';
      pFieldInfo.atomName = pBuffer;

      pFieldInfo.uiDec = 0;

      switch( PQftype( pResult, ( int ) uiCount ) )
      {
         case BPCHAROID:
         case VARCHAROID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = ( HB_USHORT ) PQfsize( pResult, uiCount ) - 4;
            break;

         case NUMERICOID:
            pFieldInfo.uiType = HB_FT_DOUBLE;
            pFieldInfo.uiLen = ( ( PQfsize( pResult, uiCount ) - 4 ) >> 16 ) & 0xFFFF;
            pFieldInfo.uiDec = ( PQfsize( pResult, uiCount ) - 4 ) & 0xFFFF;
            break;

         case INT2OID:
            pFieldInfo.uiType = HB_FT_INTEGER;
            pFieldInfo.uiLen = 6;
            break;

         case INT4OID:
            pFieldInfo.uiType = HB_FT_INTEGER;
            pFieldInfo.uiLen = 11;
            break;

         case INT8OID:
            pFieldInfo.uiType = HB_FT_LONG;
            pFieldInfo.uiLen = 20;
            break;

         case FLOAT4OID:
         case FLOAT8OID:
         case CASHOID:  /* TODO: ??? */
            pFieldInfo.uiType = HB_FT_DOUBLE;
            pFieldInfo.uiLen = 16;
            pFieldInfo.uiDec = 2;    /* TODO: hb_set.SET_DECIMALS ??? */
            break;

         case BOOLOID:
            pFieldInfo.uiType = HB_FT_LOGICAL;
            pFieldInfo.uiLen = 1;
            break;

         case DATEOID:
            pFieldInfo.uiType = HB_FT_DATE;
            pFieldInfo.uiLen = 8;
            break;

         case INETOID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = 29;
            break;

         case CIDROID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = 32;
            break;

         case MACADDROID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = 17;
            break;

         case BITOID:
         case VARBITOID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = ( HB_USHORT ) PQfsize( pResult, uiCount );
            break;

         case TIMEOID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = 12;
            break;

         case TIMESTAMPOID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = 23;
            break;

         case TIMETZOID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = 15;
            break;

         case TIMESTAMPTZOID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = 26;
            break;

         case BYTEAOID:
            pFieldInfo.uiType = HB_FT_STRING;
            pFieldInfo.uiLen = 0;
            break;

         default:
            pFieldInfo.uiType = 0;
            pFieldInfo.uiLen = 0;
            bError = HB_TRUE;
            break;
      }
      /* printf( "field:%s \ttype:%d \tsize:%d \tformat:%d \tmod:%d err=%d\n", pBuffer, PQftype( pResult, ( int ) uiCount ), PQfsize( pResult, uiCount ), PQfformat( pResult, uiCount ) , PQfmod( pResult, uiCount ), bError ); */

      if ( ! bError )
      {
         switch ( pFieldInfo.uiType )
         {
            case HB_FT_STRING:
            {
               char*    pStr;

               pStr = ( char * ) hb_xgrab( pFieldInfo.uiLen + 1 );
               memset( pStr, ' ', pFieldInfo.uiLen );
               pStr[ pFieldInfo.uiLen ] = '\0';

               pItem = hb_itemPutCL( NULL, pStr, pFieldInfo.uiLen );
               hb_xfree( pStr );
               break;
            }

            case HB_FT_INTEGER:
               pItem = hb_itemPutNI( NULL, 0 );
               break;

            case HB_FT_LONG:
               pItem = hb_itemPutNL( NULL, 0 );
               break;

            case HB_FT_DOUBLE:
               pItem = hb_itemPutND( NULL, 0.0 );
               break;

            case HB_FT_LOGICAL:
               pItem = hb_itemPutL( NULL, HB_FALSE );
               break;

            case HB_FT_DATE:
               pItem = hb_itemPutDS( NULL, NULL );
               break;

            default:
               pItem = hb_itemNew( NULL );
               bError = HB_TRUE;
               break;
         }

         hb_arraySetForward( pItemEof, uiCount + 1, pItem );
         hb_itemRelease( pItem );

/*         if ( pFieldInfo.uiType == HB_IT_DOUBLE || pFieldInfo.uiType == HB_IT_INTEGER )
         {
            pFieldInfo.uiType = HB_IT_LONG;
         } */

         if ( ! bError )
            bError = ( SELF_ADDFIELD( ( AREAP ) pArea, &pFieldInfo ) == HB_FAILURE );
      }

      if ( bError )
         break;
   }

   hb_xfree( pBuffer );

   if ( bError )
   {
     hb_itemClear( pItemEof );
     hb_itemRelease( pItemEof );
     hb_errRT_PostgreSQLDD( EG_CORRUPTION, ESQLDD_INVALIDFIELD, "Invalid field type", pArea->szQuery, 0 );
     return HB_FAILURE;
   }

   pArea->ulRecCount = ( HB_ULONG ) PQntuples( pResult );

   pArea->pRow = ( void ** ) hb_xgrab( ( pArea->ulRecCount + 1 ) * sizeof( void * ) );
   pArea->pRowFlags = ( HB_BYTE * ) hb_xgrab( ( pArea->ulRecCount + 1 ) * sizeof( HB_BYTE ) );
   memset( pArea->pRowFlags, 0, ( pArea->ulRecCount + 1 ) * sizeof( HB_BYTE ) );

   * pArea->pRow = pItemEof;
   pArea->pRowFlags[ 0 ] = SQLDD_FLAG_CACHED;
   pArea->fFetched = HB_TRUE;

   return HB_SUCCESS;
}


static HB_ERRCODE pgsqlClose( SQLBASEAREAP pArea )
{
   SDDDATA * pSDDData = ( SDDDATA * ) pArea->pSDDData;

   if ( pSDDData->pResult )
   {
      PQclear( pSDDData->pResult );
   }
   hb_xfree( pSDDData );
   return HB_SUCCESS;
}


static HB_ERRCODE pgsqlGetValue( SQLBASEAREAP pArea, HB_USHORT uiIndex, PHB_ITEM pItem )
{
   SDDDATA * pSDDData = ( SDDDATA * ) pArea->pSDDData;
   LPFIELD   pField;
   char*     pValue;
   HB_BOOL   bError;
   PHB_ITEM  pError;
   HB_SIZE   ulLen;

   bError = HB_FALSE;
   uiIndex--;
   pField = pArea->area.lpFields + uiIndex;

   if ( PQgetisnull( pSDDData->pResult, pArea->ulRecNo - 1, uiIndex ) )
      return HB_SUCCESS;

   pValue = PQgetvalue( pSDDData->pResult, pArea->ulRecNo - 1, uiIndex );
   ulLen = ( HB_SIZE ) PQgetlength( pSDDData->pResult, pArea->ulRecNo - 1, uiIndex );

/*   printf( "fieldget recno:%d index:%d value:%s len:%d\n", pArea->ulRecNo, uiIndex, pValue, ulLen ); */

   switch( pField->uiType )
   {
      case HB_FT_STRING:
         hb_itemPutCL( pItem, pValue, ulLen );
         break;

      case HB_FT_INTEGER:
      case HB_FT_LONG:
      case HB_FT_DOUBLE:
         if ( pField->uiDec )
            hb_itemPutNDLen( pItem, atof( pValue ),
                             ( int ) pField->uiLen - ( ( int ) pField->uiDec + 1 ),
                             ( int ) pField->uiDec );
         else
            if ( pField->uiLen > 9 )
               hb_itemPutNDLen( pItem, atof( pValue ),
                                ( int ) pField->uiLen, ( int ) pField->uiDec );
            else
               hb_itemPutNLLen( pItem, atol( pValue ), ( int ) pField->uiLen );
         break;

      case HB_FT_LOGICAL:
         hb_itemPutL( pItem, pValue[ 0 ] == 'T' || pValue[ 0 ] == 'Y' );
         break;


      case HB_FT_DATE:
      {
         char  szDate[ 9 ];

         szDate[ 0 ] = pValue[ 0 ];
         szDate[ 1 ] = pValue[ 1 ];
         szDate[ 2 ] = pValue[ 2 ];
         szDate[ 3 ] = pValue[ 3 ];
         szDate[ 4 ] = pValue[ 5 ];
         szDate[ 5 ] = pValue[ 6 ];
         szDate[ 6 ] = pValue[ 8 ];
         szDate[ 7 ] = pValue[ 9 ];
         szDate[ 8 ] = '\0';
         hb_itemPutDS( pItem, szDate );
         break;
      }

      default:
         bError = HB_TRUE;
         break;
   }

   if ( bError )
   {
      pError = hb_errNew();
      hb_errPutGenCode( pError, EG_DATATYPE );
      hb_errPutDescription( pError, hb_langDGetErrorDesc( EG_DATATYPE ) );
      hb_errPutSubCode( pError, EDBF_DATATYPE );
      SELF_ERROR( ( AREAP ) pArea, pError );
      hb_itemRelease( pError );
      return HB_FAILURE;
   }
   return HB_SUCCESS;
}