/*************************************************************************
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * Copyright 2008 by Sun Microsystems, Inc.
 *
 * OpenOffice.org - a multi-platform office productivity suite
 *
 * $RCSfile: fanalyzer.cxx,v $
 * $Revision: 1.26.56.1 $
 *
 * This file is part of OpenOffice.org.
 *
 * OpenOffice.org is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenOffice.org 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 version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_connectivity.hxx"
#include "file/fanalyzer.hxx"
#include "connectivity/sqlparse.hxx"
#include <osl/diagnose.h>
#include <tools/debug.hxx>
#include <comphelper/extract.hxx>
#include "connectivity/sqlnode.hxx"
#include "connectivity/dbexception.hxx"
#include "file/FConnection.hxx"
#include "resource/file_res.hrc"

using namespace ::connectivity;
using namespace ::connectivity::file;
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::beans;
using namespace ::com::sun::star::sdbc;
using namespace ::com::sun::star::container;

DBG_NAME( file_OSQLAnalyzer )
//------------------------------------------------------------------
OSQLAnalyzer::OSQLAnalyzer(OConnection* _pConnection)
               :m_pConnection(_pConnection)
               ,m_bHasSelectionCode(sal_False)
               ,m_bSelectionFirstTime(sal_True)
{
    DBG_CTOR( file_OSQLAnalyzer, NULL );
    m_aCompiler = new OPredicateCompiler(this);
    m_aInterpreter = new OPredicateInterpreter(m_aCompiler);
}

// -----------------------------------------------------------------------------
OSQLAnalyzer::~OSQLAnalyzer()
{
    DBG_DTOR( file_OSQLAnalyzer, NULL );
}

// -----------------------------------------------------------------------------
void OSQLAnalyzer::setIndexes(const Reference< XNameAccess>& _xIndexes)
{
    m_aCompiler->m_xIndexes = _xIndexes;
}
//------------------------------------------------------------------
void OSQLAnalyzer::start(OSQLParseNode* pSQLParseNode)
{
    if (SQL_ISRULE(pSQLParseNode,select_statement))
    {
        DBG_ASSERT(pSQLParseNode->count() >= 4,"OFILECursor: Fehler im Parse Tree");

        // check that we don't use anything other than count(*) as function
        OSQLParseNode* pSelection = pSQLParseNode->getChild(2);
        if ( SQL_ISRULE(pSelection,scalar_exp_commalist) )
        {
            for (sal_uInt32 i = 0; i < pSelection->count(); i++)
            {
                OSQLParseNode *pColumnRef = pSelection->getChild(i)->getChild(0);
                if (    ( SQL_ISRULE(pColumnRef,set_fct_spec) && pColumnRef->count() == 4 )
                    ||  SQL_ISRULE(pColumnRef,char_value_fct)
                    ||  SQL_ISRULE(pColumnRef,char_substring_fct)
                    ||  SQL_ISRULE(pColumnRef,position_exp)
                    ||  SQL_ISRULE(pColumnRef,fold)
                    ||  SQL_ISRULE(pColumnRef,length_exp)
                    ||  SQL_ISRULE(pColumnRef,num_value_exp)
                    ||  SQL_ISRULE(pColumnRef,term)
                    ||  SQL_ISRULE(pColumnRef,factor)
                    ||  SQL_ISRULE(pColumnRef,set_fct_spec) )
                {
                    ::vos::ORef<OPredicateCompiler>     pCompiler = new OPredicateCompiler(this);
                    pCompiler->setOrigColumns(m_aCompiler->getOrigColumns());
                    ::vos::ORef<OPredicateInterpreter>  pInterpreter = new OPredicateInterpreter(pCompiler);
                    pCompiler->execute( pColumnRef );
                    m_aSelectionEvaluations.push_back( TPredicates(pCompiler,pInterpreter) );
                }
                else if ( ( SQL_ISRULE(pColumnRef,general_set_fct) && pColumnRef->count() != 4 ) )
                {
                    m_pConnection->throwGenericSQLException(STR_QUERY_COMPLEX_COUNT,NULL);
                }
                else
                    m_aSelectionEvaluations.push_back( TPredicates() );
            }
        }
    }

    m_aCompiler->start(pSQLParseNode);
}

//------------------------------------------------------------------
void OSQLAnalyzer::bindRow(OCodeList& rCodeList,const OValueRefRow& _pRow,OEvaluateSetList& _rEvaluateSetList)
{
    // Zaehlen, wieviele Kriterien
    // wenn nur ein Kriterium, und das entsprechende Feld ist indiziert
    // dann wird der Index verwendet

    OEvaluateSet*       pEvaluateSet = NULL;

    for (OCodeList::iterator aIter = rCodeList.begin(); aIter != rCodeList.end(); ++aIter)
    {
        OOperandAttr* pAttr = PTR_CAST(OOperandAttr,(*aIter));
        if (pAttr)
        {
            if (pAttr->isIndexed() && !m_aCompiler->hasORCondition())
            {
                OCode* pCode1 = *(aIter + 1);
                OCode* pCode2 = *(aIter + 2);

                if (PTR_CAST(OOperand,pCode1))
                    pEvaluateSet = pAttr->preProcess(PTR_CAST(OBoolOperator,pCode2), PTR_CAST(OOperand,pCode1));
                else
                    pEvaluateSet = pAttr->preProcess(PTR_CAST(OBoolOperator,pCode1));
            }

            if (pEvaluateSet)
            {
                _rEvaluateSetList.push_back(pEvaluateSet);
                pEvaluateSet = NULL;
            }
            pAttr->bindValue(_pRow);
        }
    }
}
//------------------------------------------------------------------
void OSQLAnalyzer::bindSelectRow(const OValueRefRow& _pRow)
{
    // first the select part
    OEvaluateSetList    aEvaluateSetList;
    for ( ::std::vector< TPredicates >::iterator aIter = m_aSelectionEvaluations.begin(); aIter != m_aSelectionEvaluations.end();++aIter)
    {
        if ( aIter->first.isValid() )
            bindRow( aIter->first->m_aCodeList,_pRow,aEvaluateSetList);
    }
}
//------------------------------------------------------------------
::std::vector<sal_Int32>* OSQLAnalyzer::bindEvaluationRow(OValueRefRow& _pRow)
{
    OEvaluateSetList    aEvaluateSetList;
    bindRow( m_aCompiler->m_aCodeList,_pRow,aEvaluateSetList);

    ::std::vector<sal_Int32>*   pKeySet      = NULL;
    OEvaluateSet*               pEvaluateSet = NULL;

    // Keyset erzeugen mit kleinster Liste
    if(!aEvaluateSetList.empty())
    {
        // welche Liste hat den kleinsten count ?
        OEvaluateSetList::iterator i = aEvaluateSetList.begin();
        pEvaluateSet = *(i);
        for(++i; i != aEvaluateSetList.end();++i)
        {
            OEvaluateSet*   pEvaluateSetComp = (*i);
            for(OEvaluateSet::reverse_iterator j = pEvaluateSet->rbegin(); j != pEvaluateSet->rend(); ++j)
            {
                if (pEvaluateSetComp->find(j->second) != pEvaluateSetComp->end())
                    pEvaluateSet->erase(j->second);
            }
        }
        pKeySet = new ::std::vector<sal_Int32>(pEvaluateSet->size());
        sal_Int32 k=0;
        for(OEvaluateSet::iterator j = pEvaluateSet->begin(); j != pEvaluateSet->end(); ++j,++k)
        {
            (*pKeySet)[k] = j->second;
        }

        // alle loeschen
        for(i = aEvaluateSetList.begin(); i != aEvaluateSetList.end();++i)
            delete (*i);
    }

    return pKeySet;
}

//------------------------------------------------------------------
void OSQLAnalyzer::describeParam(::vos::ORef<OSQLColumns> rParameterColumns)
{
    OCodeList& rCodeList    = m_aCompiler->m_aCodeList;
    OCodeStack aCodeStack;

    if (!rCodeList.size())
        return;     // kein Praedikat
    if (!rParameterColumns->get().size())
        return; // keine Parameter

    // Anlegen von Columns, die eine genauere Beschreibung fuer die enthalten
    ::vos::ORef<OSQLColumns> aNewParamColumns = new OSQLColumns(*rParameterColumns);


    // Anlegen einer Testzeile, wird benoetigt um die Parameter zu beschreiben
    OValueRefRow aParameterRow  = new OValueRefVector(rParameterColumns->get().size());
    bindParameterRow(aParameterRow);

    OValueRefRow aTestRow = new OValueRefVector(Reference< XIndexAccess>(m_aCompiler->getOrigColumns(),UNO_QUERY)->getCount());
    delete bindEvaluationRow(aTestRow);                 // Binden der Attribute an die Values

    for(OCodeList::iterator aIter = rCodeList.begin(); aIter != rCodeList.end(); ++aIter)
    {
        OOperand* pOperand = PTR_CAST(OOperand,(*aIter));
        OOperator* pOperator = PTR_CAST(OOperator,(*aIter));
        if (pOperand)
            aCodeStack.push(pOperand);
        else
        {
            if (pOperator->getRequestedOperands() == 2)     // bei zwei Operatoren ist es moeglich
            {                                               // einen Parameter weiter zu spezifizieren
                OOperandParam *pParam  = PTR_CAST(OOperandParam,aCodeStack.top());
                if (pParam)  // Anpassen des ParameterTyps, wenn der linke Operand ein Attribut ist
                {
                    OOperandAttr *pLeft  = PTR_CAST(OOperandAttr,*(rCodeList.end() - 2));
                    if (pLeft)
                    {
                        Reference< XPropertySet> xCol;
                        Reference< XIndexAccess>(m_aCompiler->getOrigColumns(),UNO_QUERY)->getByIndex(pLeft->getRowPos()) >>= xCol;
                        OSL_ENSURE(xCol.is(), "Ungueltige Struktur");
                        pParam->describe(xCol, aNewParamColumns);
                    }
                }
            }
            pOperator->Exec(aCodeStack);
        }
    }
    OOperand* pOperand = aCodeStack.top();
    aCodeStack.pop();

    OSL_ENSURE(aCodeStack.size() == 0, "StackFehler");
    OSL_ENSURE(pOperand, "StackFehler");
    if (IS_TYPE(OOperandResult,pOperand))
        delete pOperand;
    else
        OSL_ENSURE(0,"Illegal here!");

    rParameterColumns = aNewParamColumns;
    //  m_aCompiler->setParameterColumns(rParameterColumns);
}

// -----------------------------------------------------------------------------
OOperandAttr* OSQLAnalyzer::createOperandAttr(sal_Int32 _nPos,
                                              const Reference< XPropertySet>& _xCol,
                                              const Reference< XNameAccess>& /*_xIndexes*/)
{
    return new OOperandAttr(static_cast<sal_uInt16>(_nPos),_xCol);
}
// -----------------------------------------------------------------------------
BOOL OSQLAnalyzer::hasRestriction() const
{
    return m_aCompiler->hasCode();
}
// -----------------------------------------------------------------------------
BOOL OSQLAnalyzer::hasFunctions() const
{
    if ( m_bSelectionFirstTime )
    {
        m_bSelectionFirstTime = sal_False;
        for ( ::std::vector< TPredicates >::const_iterator aIter = m_aSelectionEvaluations.begin(); aIter != m_aSelectionEvaluations.end() && !m_bHasSelectionCode ;++aIter)
        {
            if ( aIter->first.isValid() )
                m_bHasSelectionCode = aIter->first->hasCode();
        }
    }
    return m_bHasSelectionCode;;
}
// -----------------------------------------------------------------------------
void OSQLAnalyzer::setSelectionEvaluationResult(OValueRefRow& _pRow,const ::std::vector<sal_Int32>& _rColumnMapping)
{
    sal_Int32 nPos = 1;
    for ( ::std::vector< TPredicates >::iterator aIter = m_aSelectionEvaluations.begin(); aIter != m_aSelectionEvaluations.end();++aIter,++nPos)
    {
        if ( aIter->second.isValid() )
        {
            sal_Int32   map = nPos;
            // the first column (index 0) is for convenience only. The first real select column is no 1.
            if ( (nPos > 0) && (nPos < static_cast<sal_Int32>(_rColumnMapping.size())) )
                map = _rColumnMapping[nPos];
            aIter->second->startSelection((_pRow->get())[map]);
        }
    }
}
// -----------------------------------------------------------------------------
void OSQLAnalyzer::dispose()
{
    m_aCompiler->dispose();
    for ( ::std::vector< TPredicates >::iterator aIter = m_aSelectionEvaluations.begin(); aIter != m_aSelectionEvaluations.end();++aIter)
    {
        if ( aIter->first.isValid() )
            aIter->first->dispose();
    }
}
// -----------------------------------------------------------------------------
void OSQLAnalyzer::setOrigColumns(const OFileColumns& rCols)
{
    m_aCompiler->setOrigColumns(rCols);
    for ( ::std::vector< TPredicates >::iterator aIter = m_aSelectionEvaluations.begin(); aIter != m_aSelectionEvaluations.end();++aIter)
    {
        if ( aIter->first.isValid() )
            aIter->first->setOrigColumns(rCols);
    }
}
// -----------------------------------------------------------------------------