/* Copyright (C) 2014 InfiniDB, Inc.

   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; version 2 of
   the License.

   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; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

/****************************************************************************
 * $Id: func_elt.cpp 2665 2011-06-01 20:42:52Z rdempsey $
 *
 *
 ****************************************************************************/

#include <cstdlib>
#include <string>
using namespace std;

#include "functor_str.h"
#include "funchelpers.h"
#include "functioncolumn.h"
#include "rowgroup.h"
using namespace execplan;

#include "dataconvert.h"
using namespace dataconvert;

#include "checks.h"

namespace funcexp
{
CalpontSystemCatalog::ColType Func_elt::operationType(FunctionParm& fp,
                                                      CalpontSystemCatalog::ColType& resultType)
{
  return resultType;
}

string Func_elt::getStrVal(rowgroup::Row& row, FunctionParm& parm, bool& isNull,
                           CalpontSystemCatalog::ColType&)
{
  uint64_t number = 0;

  // get number
  switch (parm[0]->data()->resultType().colDataType)
  {
    case CalpontSystemCatalog::BIGINT:
    case CalpontSystemCatalog::MEDINT:
    case CalpontSystemCatalog::SMALLINT:
    case CalpontSystemCatalog::TINYINT:
    case CalpontSystemCatalog::INT:
    case CalpontSystemCatalog::DOUBLE:
    case CalpontSystemCatalog::FLOAT:
    case CalpontSystemCatalog::CHAR:
    case CalpontSystemCatalog::TEXT:
    case CalpontSystemCatalog::VARCHAR:
    {
      double value = parm[0]->data()->getDoubleVal(row, isNull);
      number = (int64_t)value;
      break;
    }

    case CalpontSystemCatalog::DECIMAL:
    case CalpontSystemCatalog::UDECIMAL:
    {
      number = static_cast<uint64_t>(parm[0]->data()->getDecimalVal(row, isNull).toSInt64Round());
      break;
    }

    default: isNull = true; return "";
  }

  if (number < 1)
  {
    isNull = true;
    return "";
  }

  if (number > parm.size() - 1)
  {
    isNull = true;
    return "";
  }

  std::string ret;
  stringValue(parm[number], row, isNull, ret);
  return ret;
}

}  // namespace funcexp
