/* 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: arithmeticoperator.cpp 9210 2013-01-21 14:10:42Z rdempsey $
*
*
***********************************************************************/
#include <iostream>

#include "bytestream.h"
#include "arithmeticoperator.h"
#include "objectreader.h"

using namespace std;

namespace {

/**@brief util struct for converting string to lower case */
struct to_lower
{
	char operator() (char c) const { return tolower(c); }
};

//Trim any leading/trailing ws
const string lrtrim(const string& in)
{
	string::size_type p1;
	p1 = in.find_first_not_of(" \t\n");
	if (p1 == string::npos) p1 = 0;
	string::size_type p2;
	p2 = in.find_last_not_of(" \t\n");
	if (p2 == string::npos) p2 = in.size() - 1;
	return string(in, p1, (p2 - p1 + 1));
}

}

namespace execplan {

/**
 * Constructors/Destructors
 */
ArithmeticOperator::ArithmeticOperator() : Operator()
{
}

ArithmeticOperator::ArithmeticOperator(const string& operatorName):Operator(operatorName)
{
}

ArithmeticOperator::ArithmeticOperator(const ArithmeticOperator& rhs):Operator(rhs)
{
}

ArithmeticOperator:: ~ArithmeticOperator()
{
}

/**
 * Operations
 */

/**
 * friend function
 */
ostream& operator<<(ostream &output, const ArithmeticOperator& rhs)
{
	output << rhs.toString();
	output << "opType=" << rhs.operationType().colDataType << endl;
	return output;
}

/**
 * The serialization interface
 */
void ArithmeticOperator::serialize(messageqcpp::ByteStream& b) const
{
	b << (ObjectReader::id_t) ObjectReader::ARITHMETICOPERATOR;
	Operator::serialize(b);
}

void ArithmeticOperator::unserialize(messageqcpp::ByteStream& b)
{
	ObjectReader::checkType(b, ObjectReader::ARITHMETICOPERATOR);
	Operator::unserialize(b);
}

bool ArithmeticOperator::operator==(const ArithmeticOperator& t) const
{
	if (data() == t.data())
		return true;
	return false;
}

bool ArithmeticOperator::operator==(const TreeNode* t) const
{
	const ArithmeticOperator *o;

	o = dynamic_cast<const ArithmeticOperator*>(t);
	if (o == NULL)
		return false;
	return *this == *o;
}

bool ArithmeticOperator::operator!=(const ArithmeticOperator& t) const
{
	return (!(*this == t));
}

bool ArithmeticOperator::operator!=(const TreeNode* t) const
{
	return (!(*this == t));
}

#if 0
void ArithmeticOperator::operationType(const Type& l, const Type& r)
{
	if (l.colDataType == execplan::CalpontSystemCatalog::DECIMAL)
	{
		switch (r.colDataType)
		{
			case execplan::CalpontSystemCatalog::DECIMAL:
			{
				// should follow the result type that MySQL gives
				fOperationType = fResultType;
				break;
			}
			case execplan::CalpontSystemCatalog::INT:
			case execplan::CalpontSystemCatalog::MEDINT:
			case execplan::CalpontSystemCatalog::TINYINT:
			case execplan::CalpontSystemCatalog::BIGINT:
				fOperationType.colDataType = execplan::CalpontSystemCatalog::DECIMAL;
				fOperationType.scale = l.scale;
				break;
			default:
				fOperationType.colDataType = execplan::CalpontSystemCatalog::DOUBLE;
		}
	}
	else if (r.colDataType == execplan::CalpontSystemCatalog::DECIMAL)
	{
		switch (l.colDataType)
		{
			case execplan::CalpontSystemCatalog::DECIMAL:
			{
				// should following the result type that MySQL gives based on the following logic?
				// @NOTE is this trustable?
				fOperationType = fResultType;
				break;
			}
			case execplan::CalpontSystemCatalog::INT:
			case execplan::CalpontSystemCatalog::MEDINT:
			case execplan::CalpontSystemCatalog::TINYINT:
			case execplan::CalpontSystemCatalog::BIGINT:
				fOperationType.colDataType = execplan::CalpontSystemCatalog::DECIMAL;
				fOperationType.scale = r.scale;
				break;
			default:
				fOperationType.colDataType = execplan::CalpontSystemCatalog::DOUBLE;
		}
	}
	else if ((l.colDataType == execplan::CalpontSystemCatalog::INT ||
				l.colDataType == execplan::CalpontSystemCatalog::MEDINT ||
				l.colDataType == execplan::CalpontSystemCatalog::TINYINT ||
				l.colDataType == execplan::CalpontSystemCatalog::BIGINT) &&
			   (r.colDataType == execplan::CalpontSystemCatalog::INT ||
				r.colDataType == execplan::CalpontSystemCatalog::MEDINT ||
				r.colDataType == execplan::CalpontSystemCatalog::TINYINT ||
				r.colDataType == execplan::CalpontSystemCatalog::BIGINT))
		fOperationType.colDataType = execplan::CalpontSystemCatalog::BIGINT;
	else
		fOperationType.colDataType = execplan::CalpontSystemCatalog::DOUBLE;
}
#endif

void ArithmeticOperator::adjustResultType(const CalpontSystemCatalog::ColType& m)
{
	if (m.colDataType != CalpontSystemCatalog::DECIMAL)
	{
		fResultType = m;
	}
	else
	{
		CalpontSystemCatalog::ColType n;
		n.colDataType = CalpontSystemCatalog::DOUBLE;
		n.scale = m.scale; // @bug5736, save the original decimal scale
		n.precision = -1;  // @bug5736, indicate this double is for decimal math
		n.colWidth = 8;
		fResultType = n;
	}
}

}  // namespace