/* 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_inet_ntoa.cpp 3495 2013-01-21 14:09:51Z rdempsey $
 *
 *
 ****************************************************************************/

#include <arpa/inet.h>
#include <netinet/in.h>
#include <iostream>  // included when debugging
#include <sstream>
#include <climits>

#include "functor_str.h"

#include "calpontsystemcatalog.h"
#include "functioncolumn.h"
#include "joblisttypes.h"
#include "rowgroup.h"

namespace funcexp
{
//------------------------------------------------------------------------------
// The only accessor function that appears to make sense in conjunction with
// inet_ntoa() is getStrVal().  I tested in MySQL (outside infinidb), and
// comparing inet_ntoa(col) to anything other than a string "seemed" to return
// an empty set.  So I implemented the other get functions to return a null.
//
// Later, Daniel found that if you compare inet_ntoa(col) to an integer (ex: 1)
// or a double (ex: 1.1), that the getDoubleVal() version of inet_ntoa(col),
// will get called.  As stated in previous paragraph, I thought I tested this,
// but I apparently overlooked something.  So getIntVal() and getDoubleVal()
// are now implemented.
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
// Return input argument type.
// See mcs_add in udfsdk.h for explanation of this function.
//------------------------------------------------------------------------------
execplan::CalpontSystemCatalog::ColType Func_inet_ntoa::operationType(
    FunctionParm& fp, execplan::CalpontSystemCatalog::ColType& resultType)
{
  return fp[0]->data()->resultType();  // input type
}

//------------------------------------------------------------------------------
// Return IP address as a long long int value.
// Not sure this is ever called, but emulated getDoubleVal() implementation,
// to be safe.  (See getDoubleVal() description)
//------------------------------------------------------------------------------
int64_t Func_inet_ntoa::getIntVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
                                  execplan::CalpontSystemCatalog::ColType& op_ct)
{
  //	std::cout << "In Func_inet_ntoa::getIntVal" << std::endl;

  std::string sValue = getStrVal(row, fp, isNull, op_ct);
  int64_t iValue = joblist::NULL_INT64;

  if (!isNull)
  {
    unsigned int newLength = sValue.length();
    std::string::size_type dot1 = sValue.find('.');

    if (dot1 != std::string::npos)
    {
      newLength = dot1;
    }

    if (newLength != sValue.length())
      sValue.resize(newLength);

    std::istringstream iss(sValue);
    iss >> iValue;
  }

  return iValue;
}

//------------------------------------------------------------------------------
// Return IP address as a double value.
// SELECT ... WHERE inet_ntoa(ipstring) = 1.1 will call getDoubleVal()
// SELECT ... WHERE inet_ntoa(ipstring) = 1   will also call getDoubleVal()
//------------------------------------------------------------------------------
double Func_inet_ntoa::getDoubleVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
                                    execplan::CalpontSystemCatalog::ColType& op_ct)
{
  //	std::cout << "In Func_inet_ntoa::getDoubleVal" << std::endl;

  std::string sValue = getStrVal(row, fp, isNull, op_ct);
  double dValue = doubleNullVal();

  if (!isNull)
  {
    unsigned int newLength = sValue.length();
    std::string::size_type dot1 = sValue.find('.');

    if ((dot1 != std::string::npos) && (sValue.length() > dot1 + 1))
    {
      std::string::size_type dot2 = sValue.find('.', dot1 + 1);

      if (dot2 != std::string::npos)
      {
        newLength = dot2;
      }
    }

    if (newLength != sValue.length())
      sValue.resize(newLength);

    std::istringstream iss(sValue);
    iss >> dValue;
  }

  return dValue;
}

//------------------------------------------------------------------------------
// Return IP address as a string value.
// This is the get function that makes sense to use.
//------------------------------------------------------------------------------
std::string Func_inet_ntoa::getStrVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
                                      execplan::CalpontSystemCatalog::ColType& op_ct)
{
  //	std::cout << "In Func_inet_ntoa::getStrVal" << std::endl;

  std::string sValue;

  int64_t iValue = 0;

  // @bug 3628 reopened: get double and round up, if necessary;
  //      else just get integer value
  if ((fp[0]->data()->resultType().colDataType == execplan::CalpontSystemCatalog::DECIMAL) ||
      (fp[0]->data()->resultType().colDataType == execplan::CalpontSystemCatalog::UDECIMAL) ||
      (fp[0]->data()->resultType().colDataType == execplan::CalpontSystemCatalog::FLOAT) ||
      (fp[0]->data()->resultType().colDataType == execplan::CalpontSystemCatalog::DOUBLE))
  {
    double d = fp[0]->data()->getDoubleVal(row, isNull);

    if (d >= 0.0)
      iValue = (int64_t)(d + 0.5);
    else
      iValue = (int64_t)(d - 0.5);
  }
  else
  {
    iValue = fp[0]->data()->getIntVal(row, isNull);
  }

  if (!isNull)
  {
    // @bug 3628 reopened: add check for out of range values
    if ((iValue < 0) || (iValue > UINT_MAX))
      isNull = true;
    else
      convertNtoa(iValue, sValue);
  }

  return sValue;
}

//------------------------------------------------------------------------------
// Return IP address as a boolean.
// N/A so returning null.  See explanation at the top of this source file.
//------------------------------------------------------------------------------
bool Func_inet_ntoa::getBoolVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
                                execplan::CalpontSystemCatalog::ColType& op_ct)
{
  //	std::cout << "In Func_inet_ntoa::getBoolVal" << std::endl;
  bool bValue = false;
  isNull = true;

  return bValue;
}

//------------------------------------------------------------------------------
// Return IP address as a decimal value.
// N/A so returning null.  See explanation at the top of this source file.
//------------------------------------------------------------------------------
execplan::IDB_Decimal Func_inet_ntoa::getDecimalVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
                                                    execplan::CalpontSystemCatalog::ColType& op_ct)
{
  //	IDB_Decimal dValue = fp[0]->data()->getDecimalVal(row, isNull);
  execplan::IDB_Decimal dValue(joblist::NULL_INT64, 0, 0);
  isNull = true;

  return dValue;
}

//------------------------------------------------------------------------------
// Return IP address as a date.
// N/A so returning null.  See explanation at the top of this source file.
//------------------------------------------------------------------------------
int32_t Func_inet_ntoa::getDateIntVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
                                      execplan::CalpontSystemCatalog::ColType& op_ct)
{
  //	std::cout << "In Func_inet_ntoa::getDateIntVal" << std::endl;

  //	int32_t iValue = fp[0]->data()->getDateIntVal(row, isNull);
  int32_t iValue = joblist::DATENULL;
  isNull = true;

  return iValue;
}

//------------------------------------------------------------------------------
// Return IP address as a date/time.
// N/A so returning null.  See explanation at the top of this source file.
//------------------------------------------------------------------------------
int64_t Func_inet_ntoa::getDatetimeIntVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
                                          execplan::CalpontSystemCatalog::ColType& op_ct)
{
  //	std::cout << "In Func_inet_ntoa::getDatetimeVal" << std::endl;

  //	int64t iValue = fp[0]->data()->getDatetimeIntVal(row, isNull);
  int64_t iValue = joblist::DATETIMENULL;
  isNull = true;

  return iValue;
}

int64_t Func_inet_ntoa::getTimestampIntVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
                                           execplan::CalpontSystemCatalog::ColType& op_ct)
{
  //	std::cout << "In Func_inet_ntoa::getTimestampVal" << std::endl;

  //	int64t iValue = fp[0]->data()->getTimestampIntVal(row, isNull);
  int64_t iValue = joblist::TIMESTAMPNULL;
  isNull = true;

  return iValue;
}

int64_t Func_inet_ntoa::getTimeIntVal(rowgroup::Row& row, FunctionParm& fp, bool& isNull,
                                      execplan::CalpontSystemCatalog::ColType& op_ct)
{
  //	std::cout << "In Func_inet_ntoa::getTimeVal" << std::endl;

  //	int64t iValue = fp[0]->data()->getTimeIntVal(row, isNull);
  int64_t iValue = joblist::TIMENULL;
  isNull = true;

  return iValue;
}

//------------------------------------------------------------------------------
// Convert an integer IP address to its equivalent IP address string.
// Source code based on MySQL source (Item_func_inet_ntoa() in item_strfunc.cc).
//------------------------------------------------------------------------------
void Func_inet_ntoa::convertNtoa(int64_t ipNum, std::string& ipString)
{
  struct sockaddr_in sa;
  sa.sin_addr.s_addr = htonl(ipNum);

  // now get it back and print it
  char str[INET_ADDRSTRLEN];
  ipString = inet_ntop(AF_INET, &(sa.sin_addr), str, INET_ADDRSTRLEN);
}

}  // namespace funcexp