/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include "ChartDropTargetHelper.hxx"
#include <DataSourceHelper.hxx>

#include <com/sun/star/chart2/XChartDocument.hpp>
#include <com/sun/star/chart2/data/XDataProvider.hpp>
#include <com/sun/star/container/XChild.hpp>

#include <sot/formats.hxx>
#include <vector>

using namespace ::com::sun::star;

using ::com::sun::star::uno::Reference;
using ::com::sun::star::uno::Sequence;

namespace
{

std::vector< OUString > lcl_getStringsFromByteSequence(
    const Sequence< sal_Int8 > & aByteSequence )
{
    std::vector< OUString > aResult;
    const sal_Int32 nLength = aByteSequence.getLength();
    const char * pBytes( reinterpret_cast< const char* >( aByteSequence.getConstArray()));
    sal_Int32 nStartPos = 0;
    for( sal_Int32 nPos=0; nPos<nLength; ++nPos )
    {
        if( pBytes[nPos] == '\0' )
        {
            aResult.emplace_back( pBytes + nStartPos, (nPos - nStartPos), RTL_TEXTENCODING_ASCII_US );
            nStartPos = nPos + 1;
        }
    }
    return aResult;
}

} // anonymous namespace

namespace chart
{

ChartDropTargetHelper::ChartDropTargetHelper(
    const Reference< datatransfer::dnd::XDropTarget >& rxDropTarget,
    const Reference< chart2::XChartDocument > & xChartDocument ) :
        DropTargetHelper( rxDropTarget ),
        m_xChartDocument( xChartDocument )
{}

ChartDropTargetHelper::~ChartDropTargetHelper()
{}

bool ChartDropTargetHelper::satisfiesPrerequisites() const
{
    return  ( m_xChartDocument.is() &&
              ! m_xChartDocument->hasInternalDataProvider());
}

sal_Int8 ChartDropTargetHelper::AcceptDrop( const AcceptDropEvent& rEvt )
{
    sal_Int8 nResult = DND_ACTION_NONE;

    if( ( rEvt.mnAction == DND_ACTION_COPY ||
          rEvt.mnAction == DND_ACTION_MOVE ) &&
        satisfiesPrerequisites() &&
        IsDropFormatSupported( SotClipboardFormatId::LINK ) )
    {
        // @todo: check if the data is suitable. Is this possible without XTransferable?
        nResult = rEvt.mnAction;
    }

    return nResult;
}

sal_Int8 ChartDropTargetHelper::ExecuteDrop( const ExecuteDropEvent& rEvt )
{
    sal_Int8 nResult = DND_ACTION_NONE;

    if( ( rEvt.mnAction == DND_ACTION_COPY ||
          rEvt.mnAction == DND_ACTION_MOVE ) &&
        rEvt.maDropEvent.Transferable.is() &&
        satisfiesPrerequisites())
    {
        TransferableDataHelper aDataHelper( rEvt.maDropEvent.Transferable );
        if( aDataHelper.HasFormat( SotClipboardFormatId::LINK ))
        {
            Sequence<sal_Int8> aBytes = aDataHelper.GetSequence(SotClipboardFormatId::LINK, OUString());
            if (aBytes.hasElements())
            {
                std::vector< OUString > aStrings( lcl_getStringsFromByteSequence( aBytes ));
                if( aStrings.size() >= 3 && aStrings[0] == "soffice" )
                {
                    OUString aRangeString( aStrings[2] );
                    Reference< container::XChild > xChild( m_xChartDocument, uno::UNO_QUERY );
                    if( xChild.is())
                    {
                        Reference< frame::XModel > xParentModel( xChild->getParent(), uno::UNO_QUERY );
                        if( xParentModel.is() &&
                            m_xChartDocument.is())
                        {
                            // @todo: get the title somehow and compare it to
                            // aDocName if successful (the document is the
                            // parent)
                            Reference< chart2::XDiagram > xDiagram( m_xChartDocument->getFirstDiagram() );
                            Reference< chart2::data::XDataProvider > xDataProvider( m_xChartDocument->getDataProvider());
                            if( xDataProvider.is() && xDiagram.is() &&
                                DataSourceHelper::allArgumentsForRectRangeDetected( m_xChartDocument ))
                            {
                                Reference< chart2::data::XDataSource > xDataSource(
                                    DataSourceHelper::pressUsedDataIntoRectangularFormat( m_xChartDocument ));
                                Sequence< beans::PropertyValue > aArguments(
                                    xDataProvider->detectArguments( xDataSource ));

                                OUString aOldRange;
                                beans::PropertyValue * pCellRange = nullptr;
                                for( sal_Int32 i=0; i<aArguments.getLength(); ++i )
                                {
                                    if ( aArguments[i].Name == "CellRangeRepresentation" )
                                    {
                                        pCellRange = (aArguments.getArray() + i);
                                        aArguments[i].Value >>= aOldRange;
                                        break;
                                    }
                                }
                                if( pCellRange )
                                {
                                    // copy means add ranges, move means replace
                                    if( rEvt.mnAction == DND_ACTION_COPY )
                                    {
                                        // @todo: using implicit knowledge that ranges can be
                                        // merged with ";". This should be done more general
                                        pCellRange->Value <<= aOldRange + ";" + aRangeString;
                                    }
                                    // move means replace range
                                    else
                                    {
                                        pCellRange->Value <<= aRangeString;
                                    }

                                    xDataSource.set( xDataProvider->createDataSource( aArguments ));
                                    xDiagram->setDiagramData( xDataSource, aArguments );

                                    // always return copy state to avoid deletion of the dragged range
                                    nResult = DND_ACTION_COPY;
                                }
                            }
                        }
                    }
                }
            }
        }
    }
    return nResult;
}

} //  namespace chart

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