/* -*- 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 <rtl/ustring.hxx>

#include <sal/log.hxx>

#include <editeng/overflowingtxt.hxx>

#include <editeng/outliner.hxx>

#include <editeng/outlobj.hxx>

#include <editeng/editeng.hxx>

#include <editeng/editobj.hxx>

#include <EditSelection.hxx>

#include <utility>

std::optional<OutlinerParaObject> TextChainingUtils::JuxtaposeParaObject(

        css::uno::Reference< css::datatransfer::XTransferable > const & xOverflowingContent,

        Outliner *pOutl,

        OutlinerParaObject const *pNextPObj)

{

    if (!pNextPObj) {

        pOutl->SetToEmptyText();

    } else {

        pOutl->SetText(*pNextPObj);

    }

    // Special case: if only empty text remove it at the end

    bool bOnlyOneEmptyPara = !pNextPObj ||

                             (pOutl->GetParagraphCount() == 1 &&

                              !pNextPObj->GetTextObject().HasText(0));

    EditEngine &rEditEngine = const_cast<EditEngine &>(pOutl->GetEditEngine());

    // XXX: this code should be moved in Outliner directly

    //          creating Outliner::InsertText(...transferable...)

    EditSelection aStartSel(rEditEngine.CreateSelection(ESelection(0,0)));

    EditSelection aNewSel = rEditEngine.InsertText(xOverflowingContent,

                                                    OUString(),

                                                    aStartSel.Min(),

                                                    true);

    if (!bOnlyOneEmptyPara) {

        // Separate Paragraphs

        rEditEngine.InsertParaBreak(aNewSel);

    }

    return pOutl->CreateParaObject();

}

std::optional<OutlinerParaObject> TextChainingUtils::DeeplyMergeParaObject(

        css::uno::Reference< css::datatransfer::XTransferable > const & xOverflowingContent,

        Outliner *pOutl,

        OutlinerParaObject const *pNextPObj)

{

    if (!pNextPObj) {

        pOutl->SetToEmptyText();

    } else {

        pOutl->SetText(*pNextPObj);

    }

    EditEngine &rEditEngine = const_cast<EditEngine &>(pOutl->GetEditEngine());

    // XXX: this code should be moved in Outliner directly

    //          creating Outliner::InsertText(...transferable...)

    EditSelection aStartSel(rEditEngine.CreateSelection(ESelection(0,0)));

    // We don't need to mark the selection

    // EditSelection aNewSel =

    rEditEngine.InsertText(xOverflowingContent,

                            OUString(),

                            aStartSel.Min(),

                            true);

    return pOutl->CreateParaObject();

}

css::uno::Reference< css::datatransfer::XTransferable > TextChainingUtils::CreateTransferableFromText(Outliner const *pOutl)

{

    EditEngine& rEditEngine = const_cast<EditEngine &>(pOutl->GetEditEngine());

    sal_Int32 nLastPara = pOutl->GetParagraphCount()-1;

    ESelection aWholeTextSel(0, 0, nLastPara, rEditEngine.GetTextLen(nLastPara));

    return rEditEngine.CreateTransferable(aWholeTextSel);

}

OverflowingText::OverflowingText(css::uno::Reference< css::datatransfer::XTransferable > xOverflowingContent) :

        mxOverflowingContent(std::move(xOverflowingContent))

{

}

NonOverflowingText::NonOverflowingText(const ESelection &aSel, bool bLastParaInterrupted)

    : maContentSel(aSel)

    , mbLastParaInterrupted(bLastParaInterrupted)

{

}

bool NonOverflowingText::IsLastParaInterrupted() const

{

    return mbLastParaInterrupted;

}

std::optional<OutlinerParaObject> NonOverflowingText::RemoveOverflowingText(Outliner *pOutliner) const

{

    pOutliner->QuickDelete(maContentSel);

    SAL_INFO("editeng.chaining", "Deleting selection from (Para: " << maContentSel.start.nPara

             << ", Pos: " << maContentSel.start.nIndex << ") to (Para: " << maContentSel.end.nPara

             << ", Pos: " << maContentSel.end.nIndex << ")");

    return pOutliner->CreateParaObject();

}

ESelection NonOverflowingText::GetOverflowPointSel() const

{

    //return getLastPositionSel(mpContentTextObj);

    // return the starting point of the selection we are removing

    return ESelection(maContentSel.start); //XXX

}

// The equivalent of ToParaObject for OverflowingText. Here we are prepending the overflowing text to the old dest box's text

// XXX: In a sense a better name for OverflowingText and NonOverflowingText are respectively DestLinkText and SourceLinkText

std::optional<OutlinerParaObject> OverflowingText::JuxtaposeParaObject(Outliner *pOutl, OutlinerParaObject const *pNextPObj)

{

    return TextChainingUtils::JuxtaposeParaObject(mxOverflowingContent, pOutl, pNextPObj);

}

std::optional<OutlinerParaObject> OverflowingText::DeeplyMergeParaObject(Outliner *pOutl, OutlinerParaObject const *pNextPObj)

{

    return TextChainingUtils::DeeplyMergeParaObject(mxOverflowingContent, pOutl, pNextPObj);

}

OFlowChainedText::OFlowChainedText(Outliner const *pOutl, bool bIsDeepMerge)

{

    mpOverflowingTxt = pOutl->GetOverflowingText();

    mpNonOverflowingTxt = pOutl->GetNonOverflowingText();

    mbIsDeepMerge = bIsDeepMerge;

}

OFlowChainedText::~OFlowChainedText()

{

}

ESelection OFlowChainedText::GetOverflowPointSel() const

{

    return mpNonOverflowingTxt->GetOverflowPointSel();

}

std::optional<OutlinerParaObject> OFlowChainedText::InsertOverflowingText(Outliner *pOutliner, OutlinerParaObject const *pTextToBeMerged)

{

    // Just return the roughly merged paras for now

    if (!mpOverflowingTxt)

        return std::nullopt;

    if (mbIsDeepMerge) {

        SAL_INFO("editeng.chaining", "[TEXTCHAINFLOW - OF] Deep merging paras" );

        return mpOverflowingTxt->DeeplyMergeParaObject(pOutliner, pTextToBeMerged );

    } else {

        SAL_INFO("editeng.chaining", "[TEXTCHAINFLOW - OF] Juxtaposing paras" );

        return mpOverflowingTxt->JuxtaposeParaObject(pOutliner, pTextToBeMerged );

    }

}

std::optional<OutlinerParaObject> OFlowChainedText::RemoveOverflowingText(Outliner *pOutliner)

{

    if (!mpNonOverflowingTxt)

        return std::nullopt;

    return mpNonOverflowingTxt->RemoveOverflowingText(pOutliner);

}

bool OFlowChainedText::IsLastParaInterrupted() const

{

    return mpNonOverflowingTxt->IsLastParaInterrupted();

}

UFlowChainedText::UFlowChainedText(Outliner const *pOutl, bool bIsDeepMerge)

{

    mxUnderflowingTxt = TextChainingUtils::CreateTransferableFromText(pOutl);

    mbIsDeepMerge = bIsDeepMerge;

}

std::optional<OutlinerParaObject> UFlowChainedText::CreateMergedUnderflowParaObject(Outliner *pOutl, OutlinerParaObject const *pNextLinkWholeText)

{

    std::optional<OutlinerParaObject> pNewText;

    if (mbIsDeepMerge) {

        SAL_INFO("editeng.chaining", "[TEXTCHAINFLOW - UF] Deep merging paras" );

        pNewText = TextChainingUtils::DeeplyMergeParaObject(mxUnderflowingTxt, pOutl, pNextLinkWholeText);

    } else {

        // NewTextForCurBox = Txt(CurBox) ++ Txt(NextBox)

        SAL_INFO("editeng.chaining", "[TEXTCHAINFLOW - UF] Juxtaposing paras" );

        pNewText = TextChainingUtils::JuxtaposeParaObject(mxUnderflowingTxt, pOutl, pNextLinkWholeText);

    }

    return pNewText;

}

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