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// -*- C++ -*-
//
// Package:     L1Trigger
// Class  :     OMDSReader
//
// Implementation:
//     <Notes on implementation>
//
// Original Author:
//         Created:  Sun Mar  2 01:46:46 CET 2008
// $Id: OMDSReader.cc,v 1.13 2010/04/12 20:29:26 wsun Exp $
//

// system include files
#include <set>
#include <iostream>

// user include files
#include "CondTools/L1Trigger/interface/OMDSReader.h"
#include "RelationalAccess/ITableDescription.h"
#include "RelationalAccess/IColumn.h"
#include "CondCore/DBCommon/interface/DbTransaction.h"

//
// constants, enums and typedefs
//

//
// static data member definitions
//

namespace l1t
{

//
// constructors and destructor
//
  OMDSReader::OMDSReader()
    : DataManager()
  {}

  OMDSReader::OMDSReader( const std::string& connectString,
                          const std::string& authenticationPath )
    : DataManager( connectString, authenticationPath, true )
  {
    session->transaction().start( true ) ;
  }

  void
  OMDSReader::connect( const std::string& connectString,
                       const std::string& authenticationPath )
  {
    DataManager::connect( connectString, authenticationPath, true ) ;
    session->transaction().start( true ) ;
  }

// OMDSReader::OMDSReader(const OMDSReader& rhs)
// {
//    // do actual copying here;
// }

OMDSReader::~OMDSReader()
{
}

//
// assignment operators
//
// const OMDSReader& OMDSReader::operator=(const OMDSReader& rhs)
// {
//   //An exception safe implementation is
//   OMDSReader temp(rhs);
//   swap(rhs);
//
//   return *this;
// }

//
// member functions
//

//
// const member functions
//

  const OMDSReader::QueryResults
  OMDSReader::basicQuery(
    const std::vector< std::string >& columnNames,
    const std::string& schemaName,
    const std::string& tableName,
    const std::string& conditionLHS,
    const QueryResults conditionRHS,
    const std::string& conditionRHSName ) const
  {
    coral::ISchema& schema = schemaName.empty() ?
      session->nominalSchema() :
      session->schema( schemaName ) ;

    coral::ITable& table = schema.tableHandle( tableName ) ;

    // Pointer is deleted automatically at end of function.
    boost::shared_ptr< coral::IQuery > query( table.newQuery() ) ;

    // Construct query
    std::vector< std::string >::const_iterator it = columnNames.begin() ;
    std::vector< std::string >::const_iterator end = columnNames.end() ;
    for( ; it != end ; ++it )
      {
        query->addToOutputList( *it ) ;
      }

    // Only apply condition if RHS has one row.
    if( !conditionLHS.empty() && conditionRHS.numberRows() == 1 )
      {
        if( !conditionRHSName.empty() )
          {
            // Assume all RHS types are strings.
            coral::AttributeList attList ;
            attList.extend( conditionRHSName, typeid( std::string ) ) ;
            std::string tmp ;
            conditionRHS.fillVariable( conditionRHSName, tmp ) ;
            attList[ conditionRHSName ].data< std::string >() = tmp ;

            query->setCondition( conditionLHS + " = :" + conditionRHSName,
                                 attList ) ;
          }
        else if( conditionRHS.columnNames().size() == 1 )
          // check for only one column
          {
            query->setCondition( conditionLHS + " = :" +
                                   conditionRHS.columnNames().front(),
                                 conditionRHS.attributeLists().front() ) ;
          }
      }

    coral::ICursor& cursor = query->execute() ;

    // Copy AttributeLists for external use because the cursor is deleted
    // when the query goes out of scope.
    std::vector< coral::AttributeList > atts ;
    while( cursor.next() )
      {
        atts.push_back( cursor.currentRow() ) ;
      } ;

    return QueryResults( columnNames, atts ) ;
  }

  const OMDSReader::QueryResults
  OMDSReader::basicQuery(
    const std::string& columnName,
    const std::string& schemaName,
    const std::string& tableName,
    const std::string& conditionLHS,
    const QueryResults conditionRHS,
    const std::string& conditionRHSName ) const
  {
    std::vector< std::string > columnNames ;
    columnNames.push_back( columnName ) ;
    return basicQuery( columnNames, schemaName, tableName,
                        conditionLHS, conditionRHS, conditionRHSName ) ;
  }

  std::vector< std::string >
  OMDSReader::columnNames(
    const std::string& schemaName,
    const std::string& tableName ) const
  {
    coral::ISchema& schema = schemaName.empty() ?
      session->nominalSchema() :
      session->schema( schemaName ) ;

    coral::ITable& table = schema.tableHandle( tableName ) ;
    const coral::ITableDescription& tableDesc = table.description() ;

    std::vector< std::string > names ;
    int nCols = tableDesc.numberOfColumns() ;

    for( int i = 0 ; i < nCols ; ++i )
      {
        const coral::IColumn& column = tableDesc.columnDescription( i ) ;
        names.push_back( column.name() ) ;
      }

    return names ;
  }

  // VIEW

  const OMDSReader::QueryResults
  OMDSReader::basicQueryView(
    const std::vector< std::string >& columnNames,
    const std::string& schemaName,
    const std::string& viewName,
    const std::string& conditionLHS,
    const QueryResults conditionRHS,
    const std::string& conditionRHSName ) const
  {
    coral::ISchema& schema = schemaName.empty() ?
      session->nominalSchema() :
      session->schema( schemaName ) ;

    //    coral::IView& view = schema.viewHandle( viewName ) ;

    // Pointer is deleted automatically at end of function.
    coral::IQuery* query = schema.newQuery(); ;

    // Construct query
    for (std::vector<std::string>::const_iterator constIt = columnNames.begin(); constIt
            != columnNames.end(); ++constIt) {
        query->addToOutputList(*constIt);
    }

    query->addToTableList(viewName);

    // Only apply condition if RHS has one row.
    if (!conditionLHS.empty() && conditionRHS.numberRows() == 1) {

        if (!conditionRHSName.empty()) {
            // Assume all RHS types are strings.
            coral::AttributeList attList;
            attList.extend(conditionRHSName, typeid(std::string));
            std::string tmp;
            conditionRHS.fillVariable(conditionRHSName, tmp);
            attList[conditionRHSName].data<std::string> () = tmp;

            query->setCondition(conditionLHS + " = :" + conditionRHSName, attList);
        } else if (conditionRHS.columnNames().size() == 1)
        // check for only one column
        {
            query->setCondition(
                    conditionLHS + " = :" + conditionRHS.columnNames().front(),
                    conditionRHS.attributeLists().front());
        }
    }

    coral::ICursor& cursor = query->execute();

    // Copy AttributeLists for external use because the cursor is deleted
    // when the query goes out of scope.
    std::vector<coral::AttributeList> atts;
    while (cursor.next()) {
        atts.push_back(cursor.currentRow());
    };

    delete query;

//    // Run a wildcard query on the view
//    coral::IQuery* query2 = workingSchema.newQuery();
//    query2->addToTableList(V0);
//    coral::ICursor& cursor2 = query2->execute();
//    while ( cursor2.next() ) {
//      cursor2.currentRow().toOutputStream( std::cout ) << std::endl;
//    }
//    delete query2;



    return QueryResults(columnNames, atts);
  }

  const OMDSReader::QueryResults
  OMDSReader::basicQueryView(
    const std::string& columnName,
    const std::string& schemaName,
    const std::string& viewName,
    const std::string& conditionLHS,
    const QueryResults conditionRHS,
    const std::string& conditionRHSName ) const
  {
    std::vector< std::string > columnNames ;
    columnNames.push_back( columnName ) ;
    return basicQuery( columnNames, schemaName, viewName,
            conditionLHS, conditionRHS, conditionRHSName ) ;
  }

  std::vector< std::string >
  OMDSReader::columnNamesView(
    const std::string& schemaName,
    const std::string& viewName ) const
  {
    coral::ISchema& schema = schemaName.empty() ?
      session->nominalSchema() :
      session->schema( schemaName ) ;

    std::set< std::string > views = schema.listViews ();
    std::vector< std::string > names ;

    if (schema.existsView (viewName)) {

        coral::IView& view = schema.viewHandle( viewName ) ;

        int nCols = view.numberOfColumns() ;

        for (int i = 0; i < nCols; ++i) {
            const coral::IColumn& column = view.column(i);
            names.push_back(column.name());
        }

        return names ;

    }

    return names ;

  }

  //
// static member functions
//
}