/* Copyright (C) 2014 InfiniDB, Inc.
   Copyright (C) 2019 MariaDB Corporaton

   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: predicateoperator.cpp 9306 2013-03-12 15:49:11Z rdempsey $
*
*
***********************************************************************/
#include <iostream>

#include "bytestream.h"
#include "predicateoperator.h"
#include "objectreader.h"

#include "liboamcpp.h"
using namespace oam;

using namespace std;

bool futf8 = true;

namespace
{

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

}

namespace execplan
{

/**
 * Constructors/Destructors
 */
PredicateOperator::PredicateOperator()
{
    Oam oam;
    // get and set locale language
    string systemLang = "C";

    try
    {
        oam.getSystemConfig("SystemLang", systemLang);
    }
    catch (...)
    {}

    if ( systemLang != "en_US.UTF-8" &&
            systemLang.find("UTF") != string::npos )
        futf8 = true;
}

PredicateOperator::PredicateOperator(const string& operatorName)
{
    Oam oam;
    // get and set locale language
    string systemLang = "C";

    try
    {
        oam.getSystemConfig("SystemLang", systemLang);
    }
    catch (...)
    {}

    if ( systemLang != "en_US.UTF-8" &&
            systemLang.find("UTF") != string::npos )
        futf8 = true;

    data(operatorName);
}

PredicateOperator::PredicateOperator(const PredicateOperator& rhs) : Operator(rhs)
{
    Oam oam;
    // get and set locale language
    string systemLang = "C";

    try
    {
        oam.getSystemConfig("SystemLang", systemLang);
    }
    catch (...)
    {}

    if ( systemLang != "en_US.UTF-8" &&
            systemLang.find("UTF") != string::npos )
        futf8 = true;

    data(rhs.data());
}

PredicateOperator:: ~PredicateOperator()
{
}

/**
 * Operations
 */

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

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

void PredicateOperator::unserialize(messageqcpp::ByteStream& b)
{
    ObjectReader::checkType(b, ObjectReader::PREDICATEOPERATOR);
    //b >> fData;
    Operator::unserialize(b);
}

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

    return false;
}

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

    o = dynamic_cast<const PredicateOperator*>(t);

    if (o == NULL)
        return false;

    return *this == *o;
}

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

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

//FIXME: VARBINARY???
void PredicateOperator::setOpType(Type& l, Type& r)
{
    if ( l.colDataType == execplan::CalpontSystemCatalog::DATETIME ||
            l.colDataType == execplan::CalpontSystemCatalog::TIME ||
            l.colDataType == execplan::CalpontSystemCatalog::DATE )
    {
        switch (r.colDataType)
        {
            case execplan::CalpontSystemCatalog::CHAR:
            case execplan::CalpontSystemCatalog::VARCHAR:
                fOperationType = l;
                break;

            case execplan::CalpontSystemCatalog::DATETIME:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::DATETIME;
                fOperationType.colWidth = 8;
                break;

            case execplan::CalpontSystemCatalog::TIME:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::TIME;
                fOperationType.colWidth = 8;
                break;

            case execplan::CalpontSystemCatalog::DATE:
                fOperationType = l;
                break;

            default:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::DOUBLE;
                fOperationType.colWidth = 8;
                break;
        }
    }
    else if ( r.colDataType == execplan::CalpontSystemCatalog::DATETIME ||
              r.colDataType == execplan::CalpontSystemCatalog::TIME ||
              r.colDataType == execplan::CalpontSystemCatalog::DATE )
    {
        switch (l.colDataType)
        {
            case execplan::CalpontSystemCatalog::CHAR:
            case execplan::CalpontSystemCatalog::VARCHAR:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::VARCHAR;
                fOperationType.colWidth = 255;
                break;

            case execplan::CalpontSystemCatalog::DATETIME:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::DATETIME;
                fOperationType.colWidth = 8;
                break;

            case execplan::CalpontSystemCatalog::TIME:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::TIME;
                fOperationType.colWidth = 8;
                break;

            case execplan::CalpontSystemCatalog::DATE:
                fOperationType = r;
                break;

            default:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::DOUBLE;
                fOperationType.colWidth = 8;
                break;
        }
    }
    else if (l.colDataType == execplan::CalpontSystemCatalog::DECIMAL ||
             l.colDataType == execplan::CalpontSystemCatalog::UDECIMAL)
    {
        switch (r.colDataType)
        {
            case execplan::CalpontSystemCatalog::DECIMAL:
            case execplan::CalpontSystemCatalog::UDECIMAL:
            {
                // should following the result type that MySQL gives
                fOperationType = l;
                fOperationType.scale = (l.scale > r.scale ? l.scale : r.scale);
                break;
            }

            case execplan::CalpontSystemCatalog::INT:
            case execplan::CalpontSystemCatalog::MEDINT:
            case execplan::CalpontSystemCatalog::TINYINT:
            case execplan::CalpontSystemCatalog::BIGINT:
            case execplan::CalpontSystemCatalog::UINT:
            case execplan::CalpontSystemCatalog::UMEDINT:
            case execplan::CalpontSystemCatalog::UTINYINT:
            case execplan::CalpontSystemCatalog::UBIGINT:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::DECIMAL;
                fOperationType.scale = l.scale;
                fOperationType.colWidth = 8;
                break;

            default:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::DOUBLE;
                fOperationType.colWidth = 8;
        }
    }
    else if (r.colDataType == execplan::CalpontSystemCatalog::DECIMAL ||
             r.colDataType == execplan::CalpontSystemCatalog::UDECIMAL)
    {
        switch (l.colDataType)
        {
            case execplan::CalpontSystemCatalog::DECIMAL:
            case execplan::CalpontSystemCatalog::UDECIMAL:
            {
                // 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:
            case execplan::CalpontSystemCatalog::UINT:
            case execplan::CalpontSystemCatalog::UMEDINT:
            case execplan::CalpontSystemCatalog::UTINYINT:
            case execplan::CalpontSystemCatalog::UBIGINT:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::DECIMAL;
                fOperationType.scale = r.scale;
                fOperationType.colWidth = 8;
                break;

            case execplan::CalpontSystemCatalog::LONGDOUBLE:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::LONGDOUBLE;
                fOperationType.colWidth = sizeof(long double);
                break;
            default:
                fOperationType.colDataType = execplan::CalpontSystemCatalog::DOUBLE;
                fOperationType.colWidth = 8;
        }
    }
    // If both sides are unsigned, use UBIGINT as result type, otherwise
    // "promote" to BIGINT.
    else if (isUnsigned(l.colDataType) && isUnsigned(r.colDataType))
    {
        fOperationType.colDataType = execplan::CalpontSystemCatalog::UBIGINT;
        fOperationType.colWidth = 8;
    }
    else if ((isSignedInteger(l.colDataType) && isUnsigned(r.colDataType)) ||
             (isUnsigned(l.colDataType) && isSignedInteger(r.colDataType)) ||
             (isSignedInteger(l.colDataType) && isSignedInteger(r.colDataType)))
    {
        fOperationType.colDataType = execplan::CalpontSystemCatalog::BIGINT;
        fOperationType.colWidth = 8;
    }
    else if ((l.colDataType == execplan::CalpontSystemCatalog::CHAR ||
              l.colDataType == execplan::CalpontSystemCatalog::VARCHAR ||
              l.colDataType == execplan::CalpontSystemCatalog::TEXT) &&
             (r.colDataType == execplan::CalpontSystemCatalog::CHAR ||
              r.colDataType == execplan::CalpontSystemCatalog::VARCHAR ||
              r.colDataType == execplan::CalpontSystemCatalog::TEXT))
    {
        if ( ( (l.colDataType == execplan::CalpontSystemCatalog::CHAR && l.colWidth <= 8) ||
                (l.colDataType == execplan::CalpontSystemCatalog::VARCHAR && l.colWidth < 8) ) &&
                ( (r.colDataType == execplan::CalpontSystemCatalog::CHAR && r.colWidth <= 8) ||
                  (r.colDataType == execplan::CalpontSystemCatalog::VARCHAR && r.colWidth < 8) ) )
        {
            if ( futf8 )
            {
                fOperationType.colDataType = execplan::CalpontSystemCatalog::VARCHAR;
                fOperationType.colWidth = 255;
            }
            else
            {
                fOperationType.colDataType = execplan::CalpontSystemCatalog::BIGINT;
                fOperationType.scale = 0;
                fOperationType.colWidth = 8;

                // @bug3532, char[] as network order int for fast comparison.
                l.colDataType = execplan::CalpontSystemCatalog::STRINT;
                r.colDataType = execplan::CalpontSystemCatalog::STRINT;
            }
        }
        else
        {
            fOperationType.colDataType = execplan::CalpontSystemCatalog::VARCHAR;
            fOperationType.colWidth = 255;
        }
    }
    else if (l.colDataType == execplan::CalpontSystemCatalog::LONGDOUBLE ||
             r.colDataType == execplan::CalpontSystemCatalog::LONGDOUBLE)
    {
        fOperationType.colDataType = execplan::CalpontSystemCatalog::LONGDOUBLE;
        fOperationType.colWidth = sizeof(long double);
    }
    else
    {
        fOperationType.colDataType = execplan::CalpontSystemCatalog::DOUBLE;
        fOperationType.colWidth = 8;
    }
}

}  // namespace