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

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

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

#include "dataconvert.h"
using namespace dataconvert;

using namespace funcexp;

namespace
{
uint64_t makedate(rowgroup::Row& row, FunctionParm& parm, bool& isNull)
{
  int64_t year = 0;
  string dayofyear;

  // get year
  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);
      year = (int64_t)value;
      break;
    }

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

    default: isNull = true; return 0;
  }

  if (year < 70)
  {
    year = 2000 + year;
  }
  else if (year < 100)
  {
    year = 1900 + year;
  }
  else if (year < 1000 || year > 9999)
  {
    isNull = true;
    return 0;
  }

  // get dayofyear
  switch (parm[1]->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:
    {
      dayofyear = parm[1]->data()->getStrVal(row, isNull).safeString("");

      if (atoi(dayofyear.c_str()) < 1)
      {
        isNull = true;
        return 0;
      }

      break;
    }

    case CalpontSystemCatalog::DECIMAL:
    case CalpontSystemCatalog::UDECIMAL:
    {
      int64_t tmp = parm[1]->data()->getDecimalVal(row, isNull).toSInt64Round();
      if (tmp < 1)
      {
        isNull = true;
        return 0;
      }
      dayofyear = helpers::intToString(tmp);
      break;
    }

    case CalpontSystemCatalog::TIME:
    {
      std::ostringstream ss;
      char buf[9];
      uint64_t aTime = parm[1]->data()->getTimeIntVal(row, isNull);
      DataConvert::timeToString1(aTime, buf, 9);
      dayofyear = buf;
      break;
    }

    default: isNull = true; return 0;
  }

  if (atoi(dayofyear.c_str()) == 0)
  {
    isNull = true;
    return 0;
  }

  // convert the year to a date in our internal format, then subtract
  // one since we are about to add the day of year back in
  Date d(year, 1, 1);
  //@Bug 5232. spare bit is set, cannot use regular substraction
  d.day -= 1;
  // uint64_t intDate = ((*(reinterpret_cast<uint32_t *> (&d))) & 0xFFFFFFC) - 1;
  uint64_t intDate = *(reinterpret_cast<uint32_t*>(&d));

  uint64_t value = helpers::dateAdd(intDate, dayofyear, IntervalColumn::INTERVAL_DAY, true, OP_ADD);

  if (value == 0)
  {
    isNull = true;
  }

  return value;
}

}  // namespace

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

int64_t Func_makedate::getIntVal(rowgroup::Row& row, FunctionParm& parm, bool& isNull,
                                 CalpontSystemCatalog::ColType&)
{
  return makedate(row, parm, isNull);
}

string Func_makedate::getStrVal(rowgroup::Row& row, FunctionParm& parm, bool& isNull,
                                CalpontSystemCatalog::ColType&)
{
  uint64_t value = makedate(row, parm, isNull);

  if (isNull)
    return "";

  return dataconvert::DataConvert::dateToString(value);
}

}  // namespace funcexp