/***********************************************************************
 field_names.cpp - Implements the FieldNames class.

 Copyright ©
    1998 by Kevin Atkinson
    1999-2001 by MySQL AB
    2004-2010 by Educational Technology Resources, Inc.
    2021 by Warren Young

 Others may also hold copyrights on code in this file.  See the
 CREDITS.txt file in the top directory of the distribution for details.

 This file is part of MySQL++.

 MySQL++ is free software; you can redistribute it and/or modify it
 under the terms of the GNU Lesser General Public License as published
 by the Free Software Foundation; either version 2.1 of the License, or
 (at your option) any later version.

 MySQL++ 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 Lesser General Public
 License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with MySQL++; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
 USA
***********************************************************************/

#define MYSQLPP_NOT_HEADER
#include "common.h"

#include "field_names.h"
#include "result.h"

#include <algorithm>

namespace mysqlpp {

namespace internal { extern void str_to_lwr(std::string& s); }

void
FieldNames::init(const ResultBase* res)
{
	size_t num = res->num_fields();
	reserve(num);

	for (size_t i = 0; i < num; i++) {
		push_back(res->fields().at(i).name());
	}
}


unsigned int
FieldNames::operator [](const std::string& s) const
{
	std::string temp1(s);
	internal::str_to_lwr(temp1);
	for (const_iterator it = begin(); it != end(); ++it) {
	std::string temp2(*it);
		internal::str_to_lwr(temp2);
#if __cplusplus < 201703L
		if (temp2.compare(temp1) == 0) {
#else
		if (temp1 == temp2) {   // faster: https://godbolt.org/z/xs114s
#endif
			// The cast is necessary for compilers where sizeof(int) !=
			// sizeof (void*) with sufficiently good warnings.  Yes,
			// technically this does risk data loss, but for that to
			// happen you'd have to have more than 2^(sizeof(int)*8)-1
			// fields in your table.  If you do that, you deserve to
			// lose anyway.
			return static_cast<unsigned int>(it - begin());
		}
	}

	return static_cast<unsigned int>(end() - begin());	// same as above
}

} // end namespace mysqlpp
