/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * 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 <drawinglayer/primitive2d/textbreakuphelper.hxx>
#include <drawinglayer/primitive2d/textdecoratedprimitive2d.hxx>
#include <com/sun/star/i18n/BreakIterator.hpp>
#include <comphelper/processfactory.hxx>
#include <com/sun/star/i18n/CharacterIteratorMode.hpp>
#include <com/sun/star/i18n/WordType.hpp>
#include <com/sun/star/i18n/CharType.hpp>


namespace drawinglayer::primitive2d
{
        TextBreakupHelper::TextBreakupHelper(const TextSimplePortionPrimitive2D& rSource)
        :   mrSource(rSource),
            mbNoDXArray(false)
        {
            maDecTrans = mrSource.getTextTransform();
            mbNoDXArray = mrSource.getDXArray().empty();

            if(mbNoDXArray)
            {
                // init TextLayouter when no dxarray
                maTextLayouter.setFontAttribute(
                    mrSource.getFontAttribute(),
                    maDecTrans.getScale().getX(),
                    maDecTrans.getScale().getY(),
                    mrSource.getLocale());
            }
        }

        TextBreakupHelper::~TextBreakupHelper()
        {
        }

        void TextBreakupHelper::breakupPortion(Primitive2DContainer& rTempResult, sal_Int32 nIndex, sal_Int32 nLength, bool bWordLineMode)
        {
            if(!(nLength && (nIndex != mrSource.getTextPosition() || nLength != mrSource.getTextLength())))
                return;

            // prepare values for new portion
            basegfx::B2DHomMatrix aNewTransform;
            std::vector< double > aNewDXArray;
            std::vector< sal_Bool > aNewKashidaArray;
            const bool bNewStartIsNotOldStart(nIndex > mrSource.getTextPosition());

            if(!mbNoDXArray)
            {
                // prepare new DXArray for the single word
                aNewDXArray = std::vector< double >(
                    mrSource.getDXArray().begin() + (nIndex - mrSource.getTextPosition()),
                    mrSource.getDXArray().begin() + ((nIndex + nLength) - mrSource.getTextPosition()));
            }

            if(!mbNoDXArray && !mrSource.getKashidaArray().empty())
            {
                aNewKashidaArray = std::vector< sal_Bool >(
                    mrSource.getKashidaArray().begin() + (nIndex - mrSource.getTextPosition()),
                    mrSource.getKashidaArray().begin() + ((nIndex + nLength) - mrSource.getTextPosition()));
            }

            if(bNewStartIsNotOldStart)
            {
                // needs to be moved to a new start position
                double fOffset(0.0);

                if(mbNoDXArray)
                {
                    // evaluate using TextLayouter
                    fOffset = maTextLayouter.getTextWidth(mrSource.getText(), mrSource.getTextPosition(), nIndex);
                }
                else
                {
                    // get from DXArray
                    const sal_Int32 nIndex2(nIndex - mrSource.getTextPosition());
                    fOffset = mrSource.getDXArray()[nIndex2 - 1];
                }

                // need offset without FontScale for building the new transformation. The
                // new transformation will be multiplied with the current text transformation
                // so FontScale would be double
                double fOffsetNoScale(fOffset);
                const double fFontScaleX(maDecTrans.getScale().getX());

                if(!basegfx::fTools::equal(fFontScaleX, 1.0)
                    && !basegfx::fTools::equalZero(fFontScaleX))
                {
                    fOffsetNoScale /= fFontScaleX;
                }

                // apply needed offset to transformation
                aNewTransform.translate(fOffsetNoScale, 0.0);

                if(!mbNoDXArray)
                {
                    // DXArray values need to be corrected with the offset, too. Here,
                    // take the scaled offset since the DXArray is scaled
                    for(double &rNewDX: aNewDXArray)
                    {
                        rNewDX -= fOffset;
                    }
                }
            }

            // add text transformation to new transformation
            aNewTransform *= maDecTrans.getB2DHomMatrix();

            // callback to allow evtl. changes
            const bool bCreate(allowChange(rTempResult.size(), aNewTransform, nIndex, nLength));

            if(!bCreate)
                return;

            // check if we have a decorated primitive as source
            const TextDecoratedPortionPrimitive2D* pTextDecoratedPortionPrimitive2D =
                dynamic_cast< const TextDecoratedPortionPrimitive2D* >(&mrSource);

            if(pTextDecoratedPortionPrimitive2D)
            {
                // create a TextDecoratedPortionPrimitive2D
                rTempResult.push_back(
                    new TextDecoratedPortionPrimitive2D(
                        aNewTransform,
                        mrSource.getText(),
                        nIndex,
                        nLength,
                        std::move(aNewDXArray),
                        std::move(aNewKashidaArray),
                        mrSource.getFontAttribute(),
                        mrSource.getLocale(),
                        mrSource.getFontColor(),
                        mrSource.getTextFillColor(),
                        mrSource.getLetterSpacing(),

                        pTextDecoratedPortionPrimitive2D->getOverlineColor(),
                        pTextDecoratedPortionPrimitive2D->getTextlineColor(),
                        pTextDecoratedPortionPrimitive2D->getFontOverline(),
                        pTextDecoratedPortionPrimitive2D->getFontUnderline(),
                        pTextDecoratedPortionPrimitive2D->getUnderlineAbove(),
                        pTextDecoratedPortionPrimitive2D->getTextStrikeout(),

                        // reset WordLineMode when BreakupUnit::Word is executed; else copy original
                        !bWordLineMode && pTextDecoratedPortionPrimitive2D->getWordLineMode(),

                        pTextDecoratedPortionPrimitive2D->getTextEmphasisMark(),
                        pTextDecoratedPortionPrimitive2D->getEmphasisMarkAbove(),
                        pTextDecoratedPortionPrimitive2D->getEmphasisMarkBelow(),
                        pTextDecoratedPortionPrimitive2D->getTextRelief(),
                        pTextDecoratedPortionPrimitive2D->getShadow()));
            }
            else
            {
                // create a SimpleTextPrimitive
                rTempResult.push_back(
                    new TextSimplePortionPrimitive2D(
                        aNewTransform,
                        mrSource.getText(),
                        nIndex,
                        nLength,
                        std::move(aNewDXArray),
                        std::move(aNewKashidaArray),
                        mrSource.getFontAttribute(),
                        mrSource.getLocale(),
                        mrSource.getFontColor(),
                        COL_TRANSPARENT,
                        mrSource.getLetterSpacing()));
            }
        }

        bool TextBreakupHelper::allowChange(sal_uInt32 /*nCount*/, basegfx::B2DHomMatrix& /*rNewTransform*/, sal_uInt32 /*nIndex*/, sal_uInt32 /*nLength*/)
        {
            return true;
        }

        void TextBreakupHelper::breakup(BreakupUnit aBreakupUnit)
        {
            if(!mrSource.getTextLength())
                return;

            Primitive2DContainer aTempResult;
            static css::uno::Reference< css::i18n::XBreakIterator > xBreakIterator;

            if(!xBreakIterator.is())
            {
                const css::uno::Reference< css::uno::XComponentContext >& xContext( ::comphelper::getProcessComponentContext() );
                xBreakIterator = css::i18n::BreakIterator::create(xContext);
            }

            const OUString& rTxt = mrSource.getText();
            const sal_Int32 nTextLength(mrSource.getTextLength());
            const css::lang::Locale& rLocale = mrSource.getLocale();
            const sal_Int32 nTextPosition(mrSource.getTextPosition());
            sal_Int32 nCurrent(nTextPosition);

            switch(aBreakupUnit)
            {
                case BreakupUnit::Character:
                {
                    sal_Int32 nDone;
                    sal_Int32 nNextCellBreak(xBreakIterator->nextCharacters(rTxt, nTextPosition, rLocale, css::i18n::CharacterIteratorMode::SKIPCELL, 0, nDone));
                    sal_Int32 a(nTextPosition);

                    for(; a < nTextPosition + nTextLength; a++)
                    {
                        if(a == nNextCellBreak)
                        {
                            breakupPortion(aTempResult, nCurrent, a - nCurrent, false);
                            nCurrent = a;
                            nNextCellBreak = xBreakIterator->nextCharacters(rTxt, a, rLocale, css::i18n::CharacterIteratorMode::SKIPCELL, 1, nDone);
                        }
                    }

                    breakupPortion(aTempResult, nCurrent, a - nCurrent, false);
                    break;
                }
                case BreakupUnit::Word:
                {
                    css::i18n::Boundary nNextWordBoundary(xBreakIterator->getWordBoundary(rTxt, nTextPosition, rLocale, css::i18n::WordType::ANY_WORD, true));
                    sal_Int32 a(nTextPosition);

                    for(; a < nTextPosition + nTextLength; a++)
                    {
                        if(a == nNextWordBoundary.endPos)
                        {
                            if(a > nCurrent)
                            {
                                breakupPortion(aTempResult, nCurrent, a - nCurrent, true);
                            }

                            nCurrent = a;

                            // skip spaces (maybe enhanced with a bool later if needed)
                            {
                                const sal_Int32 nEndOfSpaces(xBreakIterator->endOfCharBlock(rTxt, a, rLocale, css::i18n::CharType::SPACE_SEPARATOR));

                                if(nEndOfSpaces > a)
                                {
                                    nCurrent = nEndOfSpaces;
                                }
                            }

                            nNextWordBoundary = xBreakIterator->getWordBoundary(rTxt, a + 1, rLocale, css::i18n::WordType::ANY_WORD, true);
                        }
                    }

                    if(a > nCurrent)
                    {
                        breakupPortion(aTempResult, nCurrent, a - nCurrent, true);
                    }
                    break;
                }
            }

            mxResult = std::move(aTempResult);
        }

        Primitive2DContainer TextBreakupHelper::extractResult(BreakupUnit aBreakupUnit)
        {
            if(mxResult.empty())
            {
                breakup(aBreakupUnit);
            }

            return std::move(mxResult);
        }

} // end of namespace

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