/*
 * MariaDB/MySQL Database Driver
 *
 * Copyright 2007 Mindaugas Kavaliauskas <dbtopas at dbtopas.lt>
 *
 * 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 program; see the file LICENSE.txt.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
 *
 * 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 "hbrddsql.h"

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

#ifndef my_socket_defined
#define my_socket_defined
typedef int my_socket;
#endif

#include "mysql.h"

#ifndef MYSQL_TYPE_NEWDECIMAL
#define MYSQL_TYPE_NEWDECIMAL  246
#endif


typedef struct
{
   MYSQL * pMySql;
} SDDCONN;

typedef struct
{
   MYSQL_RES *     pResult;
   MYSQL_ROW       pNatRecord;
   unsigned long * pNatLength;
} SDDDATA;


static HB_ERRCODE mysqlConnect( SQLDDCONNECTION * pConnection, PHB_ITEM pItem );
static HB_ERRCODE mysqlDisconnect( SQLDDCONNECTION * pConnection );
static HB_ERRCODE mysqlExecute( SQLDDCONNECTION * pConnection, PHB_ITEM pItem );
static HB_ERRCODE mysqlOpen( SQLBASEAREAP pArea );
static HB_ERRCODE mysqlClose( SQLBASEAREAP pArea );
static HB_ERRCODE mysqlGoTo( SQLBASEAREAP pArea, HB_ULONG ulRecNo );
static HB_ERRCODE mysqlGetValue( SQLBASEAREAP pArea, HB_USHORT uiIndex, PHB_ITEM pItem );


static SDDNODE s_mysqldd =
{
   NULL,
   "MYSQL",
   ( SDDFUNC_CONNECT ) mysqlConnect,
   ( SDDFUNC_DISCONNECT ) mysqlDisconnect,
   ( SDDFUNC_EXECUTE ) mysqlExecute,
   ( SDDFUNC_OPEN ) mysqlOpen,
   ( SDDFUNC_CLOSE ) mysqlClose,
   ( SDDFUNC_GOTO ) mysqlGoTo,
   ( SDDFUNC_GETVALUE ) mysqlGetValue,
   ( SDDFUNC_GETVARLEN ) NULL
};


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

   if( ! hb_sddRegister( &s_mysqldd ) ||
       ( sizeof( MYSQL_ROW_OFFSET ) != sizeof( void * ) ) )
   {
      hb_errInternal( HB_EI_RDDINVALID, NULL, NULL, NULL );
   }
}

HB_FUNC( HB_SDDMY_REGISTER )
{
   hb_mysqldd_init( NULL );
}

/* force SQLBASE linking */
HB_FUNC_TRANSLATE( SDDMY, SQLBASE )

HB_INIT_SYMBOLS_BEGIN( mysqldd__InitSymbols )
{
   "SDDMY", { HB_FS_PUBLIC }, { HB_FUNCNAME( SDDMY ) }, NULL
},
HB_INIT_SYMBOLS_END( mysqldd__InitSymbols )

HB_CALL_ON_STARTUP_BEGIN( _hb_mysqldd_init_ )
hb_vmAtInit( hb_mysqldd_init, NULL );
HB_CALL_ON_STARTUP_END( _hb_mysqldd_init_ )

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


/* --- */
static HB_USHORT hb_errRT_MySQLDD( 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, "SDDMY", errGenCode, errSubCode, szDescription, szOperation, errOsCode, EF_NONE );
   uiAction = hb_errLaunch( pError );
   hb_itemRelease( pError );
   return uiAction;
}

/* --- SDD METHODS --- */
static HB_ERRCODE mysqlConnect( SQLDDCONNECTION * pConnection, PHB_ITEM pItem )
{
   MYSQL *  pMySql;
   PHB_ITEM pItemUnixSocket = hb_arrayGetItemPtr( pItem, 7 );

   pMySql = mysql_init( NULL );
   if( ! mysql_real_connect( pMySql,
                             hb_arrayGetCPtr( pItem, 2 ) /* host */,
                             hb_arrayGetCPtr( pItem, 3 ) /* user */,
                             hb_arrayGetCPtr( pItem, 4 ) /* password */,
                             hb_arrayGetCPtr( pItem, 5 ) /* db */,
                             hb_arrayGetNI( pItem, 6 ) /* port */,
                             pItemUnixSocket && HB_IS_STRING( pItemUnixSocket ) ? hb_itemGetCPtr( pItemUnixSocket ) : NULL,
                             hb_arrayGetNI( pItem, 8 ) /* flags*/ ) )
   {
      hb_rddsqlSetError( mysql_errno( pMySql ), mysql_error( pMySql ), NULL, NULL, 0 );
      mysql_close( pMySql );
      return HB_FAILURE;
   }
   pConnection->pSDDConn = hb_xgrab( sizeof( SDDCONN ) );
   ( ( SDDCONN * ) pConnection->pSDDConn )->pMySql = pMySql;
   return HB_SUCCESS;
}


static HB_ERRCODE mysqlDisconnect( SQLDDCONNECTION * pConnection )
{
   mysql_close( ( ( SDDCONN * ) pConnection->pSDDConn )->pMySql );
   hb_xfree( pConnection->pSDDConn );
   return HB_SUCCESS;
}


static HB_ERRCODE mysqlExecute( SQLDDCONNECTION * pConnection, PHB_ITEM pItem )
{
   MYSQL *     pMySql = ( ( SDDCONN * ) pConnection->pSDDConn )->pMySql;
   MYSQL_RES * pResult;
   HB_ULONG    ulAffectedRows;
   PHB_ITEM    pNewID = NULL;

   if( mysql_real_query( pMySql, hb_itemGetCPtr( pItem ), ( unsigned long ) hb_itemGetCLen( pItem ) ) )
   {
      hb_rddsqlSetError( mysql_errno( pMySql ), mysql_error( pMySql ), hb_itemGetCPtr( pItem ), NULL, 0 );
      return HB_FAILURE;
   }

   pResult = mysql_store_result( pMySql );
   if( pResult )
   {
      ulAffectedRows = ( HB_ULONG ) mysql_num_rows( pResult );
      mysql_free_result( pResult );
      hb_rddsqlSetError( 0, NULL, hb_itemGetCPtr( pItem ), NULL, ulAffectedRows );
   }
   else
   {
      if( mysql_field_count( pMySql ) == 0 )
      {
         ulAffectedRows = ( HB_ULONG ) mysql_affected_rows( pMySql );
         if( mysql_insert_id( pMySql ) != 0 )
         {
            pNewID = hb_itemPutNInt( NULL, mysql_insert_id( pMySql ) );
         }
         hb_rddsqlSetError( 0, NULL, hb_itemGetCPtr( pItem ), pNewID, ulAffectedRows );
         if( pNewID )
            hb_itemRelease( pNewID );
      }
      else /* error */
      {
         hb_rddsqlSetError( mysql_errno( pMySql ), mysql_error( pMySql ), hb_itemGetCPtr( pItem ), NULL, 0 );
         return HB_FAILURE;
      }
   }
   return HB_SUCCESS;
}


static HB_ERRCODE mysqlOpen( SQLBASEAREAP pArea )
{
   MYSQL *       pMySql = ( ( SDDCONN * ) pArea->pConnection->pSDDConn )->pMySql;
   SDDDATA *     pSDDData;
   PHB_ITEM      pItemEof, pItem;
   HB_ULONG      ulIndex;
   HB_USHORT     uiFields, uiCount;
   HB_ERRCODE    errCode = 0;
   HB_BOOL       bError;
   MYSQL_FIELD * pMyField;
   void **       pRow;

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

   if( mysql_real_query( pMySql, pArea->szQuery, ( unsigned long ) strlen( pArea->szQuery ) ) )
   {
      hb_errRT_MySQLDD( EG_OPEN, ESQLDD_INVALIDQUERY, ( const char * ) mysql_error( pMySql ), pArea->szQuery,
                        mysql_errno( pMySql ) );
      return HB_FAILURE;
   }

   if( ( pSDDData->pResult = mysql_store_result( pMySql ) ) == NULL )
   {
      hb_errRT_MySQLDD( EG_MEM, ESQLDD_INVALIDQUERY, ( const char * ) mysql_error( pMySql ), pArea->szQuery,
                        mysql_errno( pMySql ) );
      return HB_FAILURE;
   }

   uiFields = ( HB_USHORT ) mysql_num_fields( pSDDData->pResult );
   SELF_SETFIELDEXTENT( &pArea->area, uiFields );

   pItemEof = hb_itemArrayNew( uiFields );

   bError = HB_FALSE;
   for( uiCount = 0; uiCount < uiFields; uiCount++ )
   {
      DBFIELDINFO dbFieldInfo;

      pMyField = mysql_fetch_field_direct( pSDDData->pResult, uiCount );

      memset( &dbFieldInfo, 0, sizeof( dbFieldInfo ) );
      dbFieldInfo.atomName = pMyField->name;
      dbFieldInfo.uiLen    = ( HB_USHORT ) pMyField->length;

      switch( pMyField->type )
      {
         case MYSQL_TYPE_TINY:
         case MYSQL_TYPE_SHORT:
            dbFieldInfo.uiType = HB_FT_INTEGER;
            break;

         case MYSQL_TYPE_LONG:
         case MYSQL_TYPE_LONGLONG:
         case MYSQL_TYPE_INT24:
            dbFieldInfo.uiType = HB_FT_LONG;
            break;

         case MYSQL_TYPE_DECIMAL:
         case MYSQL_TYPE_NEWDECIMAL:
         case MYSQL_TYPE_FLOAT:
         case MYSQL_TYPE_DOUBLE:
            dbFieldInfo.uiType = HB_FT_DOUBLE;
            dbFieldInfo.uiDec  = ( HB_USHORT ) pMyField->decimals;
            break;

         case MYSQL_TYPE_STRING:
         case MYSQL_TYPE_VAR_STRING:
         case MYSQL_TYPE_ENUM:
            dbFieldInfo.uiType = HB_FT_STRING;
            break;

         case MYSQL_TYPE_DATE:
            dbFieldInfo.uiType = HB_FT_DATE;
            break;

         case MYSQL_TYPE_TINY_BLOB:
         case MYSQL_TYPE_MEDIUM_BLOB:
         case MYSQL_TYPE_LONG_BLOB:
         case MYSQL_TYPE_BLOB:
            dbFieldInfo.uiType = HB_FT_MEMO;
            break;

         case MYSQL_TYPE_TIMESTAMP:
         case MYSQL_TYPE_DATETIME:
#if MYSQL_VERSION_ID >= 50610
         case MYSQL_TYPE_TIMESTAMP2:
         case MYSQL_TYPE_DATETIME2:
#endif
            dbFieldInfo.uiType = HB_FT_TIMESTAMP;
            dbFieldInfo.uiLen  = 8;
            break;

         case MYSQL_TYPE_TIME:
#if MYSQL_VERSION_ID >= 50610
         case MYSQL_TYPE_TIME2:
#endif
            dbFieldInfo.uiType = HB_FT_TIME;
            dbFieldInfo.uiLen  = 4;
            break;

#if 0
         case MYSQL_TYPE_NULL:
         case MYSQL_TYPE_YEAR:
         case MYSQL_TYPE_NEWDATE:
         case MYSQL_TYPE_SET:
         case MYSQL_TYPE_VARCHAR:
         case MYSQL_TYPE_BIT:
         case MYSQL_TYPE_GEOMETRY:
#endif
         default:
            bError  = HB_TRUE;
            errCode = ( HB_ERRCODE ) pMyField->type;
            break;
      }

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

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

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

            case HB_FT_MEMO:
               pItem = hb_itemPutC( NULL, NULL );
               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_DATE:
               pItem = hb_itemPutDS( NULL, NULL );
               break;

            case HB_FT_TIMESTAMP:
            case HB_FT_TIME:
               pItem = hb_itemPutTDT( NULL, 0, 0 );
               break;

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

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

#if 0
         if( dbFieldInfo.uiType == HB_IT_DOUBLE || dbFieldInfo.uiType == HB_IT_INTEGER )
            dbFieldInfo.uiType = HB_IT_LONG;
#endif

         if( ! bError )
            bError = ( SELF_ADDFIELD( &pArea->area, &dbFieldInfo ) == HB_FAILURE );
      }

      if( bError )
         break;
   }

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

   pArea->ulRecCount = ( HB_ULONG ) mysql_num_rows( pSDDData->pResult );
   pArea->ulRecMax   = pArea->ulRecCount + 1;

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

   pRow = pArea->pRow;

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

   for( ulIndex = 1; ulIndex <= pArea->ulRecCount; ulIndex++ )
   {
      *pRow++ = ( void * ) mysql_row_tell( pSDDData->pResult );
      mysql_fetch_row( pSDDData->pResult );
   }
   pArea->fFetched = HB_TRUE;

   return HB_SUCCESS;
}


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

   if( pSDDData )
   {
      if( pSDDData->pResult )
         mysql_free_result( pSDDData->pResult );

      hb_xfree( pSDDData );
      pArea->pSDDData = NULL;
   }
   return HB_SUCCESS;
}


static HB_ERRCODE mysqlGoTo( SQLBASEAREAP pArea, HB_ULONG ulRecNo )
{
   SDDDATA * pSDDData = ( SDDDATA * ) pArea->pSDDData;

   if( ulRecNo == 0 || ulRecNo > pArea->ulRecCount )
   {
      pArea->pRecord      = pArea->pRow[ 0 ];
      pArea->bRecordFlags = pArea->pRowFlags[ 0 ];

      pArea->fPositioned = HB_FALSE;
   }
   else
   {
      pArea->pRecord      = pArea->pRow[ ulRecNo ];
      pArea->bRecordFlags = pArea->pRowFlags[ ulRecNo ];

      if( ! ( pArea->bRecordFlags & SQLDD_FLAG_CACHED ) )
      {
         mysql_row_seek( pSDDData->pResult, ( MYSQL_ROW_OFFSET ) pArea->pRecord );
         pSDDData->pNatRecord = mysql_fetch_row( pSDDData->pResult );
         pSDDData->pNatLength = mysql_fetch_lengths( pSDDData->pResult );
      }

      pArea->fPositioned = HB_TRUE;
   }
   return HB_SUCCESS;
}


static HB_ERRCODE mysqlGetValue( SQLBASEAREAP pArea, HB_USHORT uiIndex, PHB_ITEM pItem )
{
   SDDDATA * pSDDData = ( SDDDATA * ) pArea->pSDDData;
   LPFIELD   pField;
   char *    pValue;
   char      szBuffer[ 64 ];
   HB_BOOL   bError;
   HB_SIZE   nLen;

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

   pValue = pSDDData->pNatRecord[ uiIndex ];
   nLen   = pSDDData->pNatLength[ uiIndex ];

   /* NULL => NIL (?) */
   if( ! pValue )
   {
      hb_itemClear( pItem );
      return HB_SUCCESS;
   }

   switch( pField->uiType )
   {
      case HB_FT_STRING:
      {
#if 0
         char * pStr;

         /* Expand strings to field length */
         pStr = ( char * ) hb_xgrab( pField->uiLen + 1 );
         memcpy( pStr, pValue, nLen );

         if( ( HB_SIZE ) pField->uiLen > nLen )
            memset( pStr + nLen, ' ', pField->uiLen - nLen );

         pStr[ pField->uiLen ] = '\0';
         hb_itemPutCRaw( pItem, pStr, pField->uiLen );
#else
         /* Do not expand strings */
         hb_itemPutCL( pItem, pValue, nLen );
#endif
         break;
      }

      case HB_FT_MEMO:
         hb_itemPutCL( pItem, pValue, nLen );
         hb_itemSetCMemo( pItem );
         break;

      case HB_FT_INTEGER:
      case HB_FT_LONG:
      case HB_FT_DOUBLE:
         hb_strncpy( szBuffer, pValue, sizeof( szBuffer ) - 1 );

         if( pField->uiDec )
            hb_itemPutNDLen( pItem, atof( szBuffer ),
                             ( int ) pField->uiLen - ( ( int ) pField->uiDec + 1 ),
                             ( int ) pField->uiDec );
         else
            hb_itemPutNLLen( pItem, atol( szBuffer ), ( int ) pField->uiLen );
         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;
      }

      case HB_FT_TIMESTAMP:
      {
         char szTimeStamp[ 15 ];

         szTimeStamp[ 0 ] = pValue[ 0 ];
         szTimeStamp[ 1 ] = pValue[ 1 ];
         szTimeStamp[ 2 ] = pValue[ 2 ];
         szTimeStamp[ 3 ] = pValue[ 3 ];
         szTimeStamp[ 4 ] = pValue[ 5 ];
         szTimeStamp[ 5 ] = pValue[ 6 ];
         szTimeStamp[ 6 ] = pValue[ 8 ];
         szTimeStamp[ 7 ] = pValue[ 9 ];

         szTimeStamp[ 8 ]  = pValue[ 11 ];
         szTimeStamp[ 9 ]  = pValue[ 12 ];
         szTimeStamp[ 10 ] = pValue[ 14 ];
         szTimeStamp[ 11 ] = pValue[ 15 ];
         szTimeStamp[ 12 ] = pValue[ 17 ];
         szTimeStamp[ 13 ] = pValue[ 18 ];
         szTimeStamp[ 14 ] = '\0';
         hb_itemPutTS( pItem, szTimeStamp );
         break;
      }

      case HB_FT_TIME:
      {
         char szTimeStamp[ 15 ];

         szTimeStamp[ 0 ] = '0';
         szTimeStamp[ 1 ] = '0';
         szTimeStamp[ 2 ] = '0';
         szTimeStamp[ 3 ] = '0';
         szTimeStamp[ 4 ] = '0';
         szTimeStamp[ 5 ] = '0';
         szTimeStamp[ 6 ] = '0';
         szTimeStamp[ 7 ] = '0';

         szTimeStamp[ 8 ]  = pValue[ 0 ];
         szTimeStamp[ 9 ]  = pValue[ 1 ];
         szTimeStamp[ 10 ] = pValue[ 3 ];
         szTimeStamp[ 11 ] = pValue[ 4 ];
         szTimeStamp[ 12 ] = pValue[ 6 ];
         szTimeStamp[ 13 ] = pValue[ 7 ];
         szTimeStamp[ 14 ] = '\0';
         hb_itemPutTS( pItem, szTimeStamp );
         break;
      }

      default:
         bError = HB_TRUE;
         break;
   }

   if( bError )
   {
      PHB_ITEM pError = hb_errNew();
      hb_errPutGenCode( pError, EG_DATATYPE );
      hb_errPutDescription( pError, hb_langDGetErrorDesc( EG_DATATYPE ) );
      hb_errPutSubCode( pError, EDBF_DATATYPE );
      SELF_ERROR( &pArea->area, pError );
      hb_itemRelease( pError );
      return HB_FAILURE;
   }
   return HB_SUCCESS;
}