/*
----
This file is part of SECONDO.

Copyright (C) 2021,
Faculty of Mathematics and Computer Science,
Database Systems for New Applications.

SECONDO 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 of the License, or
(at your option) any later version.

SECONDO 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 SECONDO; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
----

//[$][\$]

*/
#ifndef _RESULT_ITERATOR_POSTGRES_H_
#define _RESULT_ITERATOR_POSTGRES_H_

#include "ResultIteratorGeneric.h"

#include <postgres.h>
#include <libpq-fe.h>
#include <catalog/pg_type.h>


namespace BasicEngine {
   class ResultIteratorPostgres : public ResultIteratorGeneric {
       public:

        ResultIteratorPostgres(PGresult* res, ListExpr &type) 
           : ResultIteratorGeneric(type), res(res) {

            if(ready) {
                totalTuples = PQntuples(res);
            } else {
                totalTuples = 0;
            }
        }

        virtual ~ResultIteratorPostgres() {
            if(res != nullptr) {
                PQclear(res);
                res = nullptr;
            }
        }

        virtual bool hasNextTuple();
        virtual Tuple* getNextTuple();

       private:
        PGresult* res = nullptr;

        int currentTuple = 0;
        int totalTuples = 0;
   };
}

#endif