/* 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_instr.cpp 3645 2013-03-19 13:10:24Z rdempsey $
*
*
****************************************************************************/

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

#include "functor_int.h"
#include "functioncolumn.h"
#include "rowgroup.h"
#include "utils_utf8.h"
using namespace execplan;

namespace funcexp
{
CalpontSystemCatalog::ColType Func_instr::operationType( FunctionParm& fp, CalpontSystemCatalog::ColType& resultType )
{
    CalpontSystemCatalog::ColType ct;
    ct.colDataType = CalpontSystemCatalog::VARCHAR;
    ct.colWidth = 255;
    return ct;
}

size_t Func_instr::in_str(const string& str, const string& substr, size_t start)
{
    // convert both inputs to wide character strings
    std::wstring wcstr = utf8::utf8_to_wstring(str);
    std::wstring wcsubstr = utf8::utf8_to_wstring(substr);

    if ((str.length() && !wcstr.length()) ||
            (substr.length() && !wcsubstr.length()))
        // this means one or both of the strings had conversion errors to wide character
        return 0;

    size_t pos = wcstr.find(wcsubstr, start - 1);
    return (pos != string::npos ? pos + 1 : 0);
}

int64_t Func_instr::getIntVal(rowgroup::Row& row,
                              FunctionParm& parm,
                              bool& isNull,
                              CalpontSystemCatalog::ColType&)
{
    uint64_t start = 1;

    if (parm.size() == 3)
        start = parm[2]->data()->getIntVal(row, isNull);

    if (isNull || start == 0)
        return 0;

    //Bug 5110 : to support utf8 char type, we have to convert and search
    return in_str(parm[0]->data()->getStrVal(row, isNull), parm[1]->data()->getStrVal(row, isNull), start);

}


} // namespace funcexp
// vim:ts=4 sw=4: