/* -*- 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 "datamodel.hxx"
#include <rtl/ustrbuf.hxx>
#include <sal/log.hxx>
#include <drawingml/customshapeproperties.hxx>
#include <drawingml/fillproperties.hxx>
#include <drawingml/textbody.hxx>
#include <drawingml/textparagraph.hxx>
#include <drawingml/textrun.hxx>
#include <oox/token/namespaces.hxx>
#include <svx/DiagramDataInterface.hxx>
#include <comphelper/xmltools.hxx>

#include <unordered_set>
#include <iostream>
#include <fstream>

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

namespace oox { namespace drawingml {

namespace dgm {

void Connection::dump() const
{
    SAL_INFO(
        "oox.drawingml",
        "cnx modelId " << msModelId << ", srcId " << msSourceId << ", dstId "
            << msDestId << ", parTransId " << msParTransId << ", presId "
            << msPresId << ", sibTransId " << msSibTransId << ", srcOrd "
            << mnSourceOrder << ", dstOrd " << mnDestOrder);
}

void Point::dump() const
{
    SAL_INFO(
        "oox.drawingml",
        "pt text " << mpShape.get() << ", cnxId " << msCnxId << ", modelId "
            << msModelId << ", type " << mnType);
}

} // dgm namespace

DiagramData::DiagramData() :
    mpFillProperties( new FillProperties )
{
}

const dgm::Point* DiagramData::getRootPoint() const
{
    for (const auto & aCurrPoint : maPoints)
        if (aCurrPoint.mnType == XML_doc)
            return &aCurrPoint;

    SAL_WARN("oox.drawingml", "No root point");
    return nullptr;
}

void DiagramData::dump() const
{
    SAL_INFO("oox.drawingml", "Dgm: DiagramData # of cnx: " << maConnections.size() );
    for (const auto& rConnection : maConnections)
        rConnection.dump();

    SAL_INFO("oox.drawingml", "Dgm: DiagramData # of pt: " << maPoints.size() );
    for (const auto& rPoint : maPoints)
        rPoint.dump();
}

void DiagramData::getChildrenString(OUStringBuffer& rBuf, const dgm::Point* pPoint, sal_Int32 nLevel) const
{
    if (!pPoint)
        return;

    if (nLevel > 0)
    {
        for (sal_Int32 i = 0; i < nLevel-1; i++)
            rBuf.append('\t');
        rBuf.append('+');
        rBuf.append(' ');
        rBuf.append(pPoint->mpShape->getTextBody()->getParagraphs().front()->getRuns().front()->getText());
        rBuf.append('\n');
    }

    std::vector<const dgm::Point*> aChildren;
    for (const auto& rCxn : maConnections)
        if (rCxn.mnType == XML_parOf && rCxn.msSourceId == pPoint->msModelId)
        {
            if (rCxn.mnSourceOrder >= static_cast<sal_Int32>(aChildren.size()))
                aChildren.resize(rCxn.mnSourceOrder + 1);
            const auto pChild = maPointNameMap.find(rCxn.msDestId);
            if (pChild != maPointNameMap.end())
                aChildren[rCxn.mnSourceOrder] = pChild->second;
        }

    for (auto pChild : aChildren)
        getChildrenString(rBuf, pChild, nLevel + 1);
}

OUString DiagramData::getString() const
{
    OUStringBuffer aBuf;
    const dgm::Point* pPoint = getRootPoint();
    getChildrenString(aBuf, pPoint, 0);
    return aBuf.makeStringAndClear();
}

std::vector<std::pair<OUString, OUString>> DiagramData::getChildren(const OUString& rParentId) const
{
    const OUString sModelId = rParentId.isEmpty() ? getRootPoint()->msModelId : rParentId;
    std::vector<std::pair<OUString, OUString>> aChildren;
    for (const auto& rCxn : maConnections)
        if (rCxn.mnType == XML_parOf && rCxn.msSourceId == sModelId)
        {
            if (rCxn.mnSourceOrder >= static_cast<sal_Int32>(aChildren.size()))
                aChildren.resize(rCxn.mnSourceOrder + 1);
            const auto pChild = maPointNameMap.find(rCxn.msDestId);
            if (pChild != maPointNameMap.end())
                aChildren[rCxn.mnSourceOrder] = std::make_pair(
                    pChild->second->msModelId,
                    pChild->second->mpShape->getTextBody()->getParagraphs().front()->getRuns().front()->getText());
        }

    // HACK: empty items shouldn't appear there
    aChildren.erase(std::remove_if(aChildren.begin(), aChildren.end(),
                                   [](const std::pair<OUString, OUString>& aItem) { return aItem.first.isEmpty(); }),
                    aChildren.end());

    return aChildren;
}

void DiagramData::addConnection(sal_Int32 nType, const OUString& sSourceId, const OUString& sDestId)
{
    sal_Int32 nMaxOrd = -1;
    for (const auto& aCxn : maConnections)
        if (aCxn.mnType == nType && aCxn.msSourceId == sSourceId)
            nMaxOrd = std::max(nMaxOrd, aCxn.mnSourceOrder);

    dgm::Connection& rCxn = maConnections.emplace_back();
    rCxn.mnType = nType;
    rCxn.msSourceId = sSourceId;
    rCxn.msDestId = sDestId;
    rCxn.mnSourceOrder = nMaxOrd + 1;
}

OUString DiagramData::addNode(const OUString& rText)
{
    const dgm::Point& rDataRoot = *getRootPoint();
    OUString sPresRoot;
    for (const auto& aCxn : maConnections)
        if (aCxn.mnType == XML_presOf && aCxn.msSourceId == rDataRoot.msModelId)
            sPresRoot = aCxn.msDestId;

    if (sPresRoot.isEmpty())
        return OUString();

    OUString sNewNodeId = OStringToOUString(comphelper::xml::generateGUIDString(), RTL_TEXTENCODING_UTF8);

    dgm::Point aDataPoint;
    aDataPoint.mnType = XML_node;
    aDataPoint.msModelId = sNewNodeId;
    aDataPoint.mpShape.reset(new Shape());
    aDataPoint.mpShape->setTextBody(std::make_shared<TextBody>());
    TextRunPtr pTextRun(new TextRun());
    pTextRun->getText() = rText;
    aDataPoint.mpShape->getTextBody()->addParagraph().addRun(pTextRun);

    OUString sDataSibling;
    for (const auto& aCxn : maConnections)
        if (aCxn.mnType == XML_parOf && aCxn.msSourceId == rDataRoot.msModelId)
            sDataSibling = aCxn.msDestId;

    OUString sPresSibling;
    for (const auto& aCxn : maConnections)
        if (aCxn.mnType == XML_presOf && aCxn.msSourceId == sDataSibling)
            sPresSibling = aCxn.msDestId;

    dgm::Point aPresPoint;
    aPresPoint.mnType = XML_pres;
    aPresPoint.msModelId = OStringToOUString(comphelper::xml::generateGUIDString(), RTL_TEXTENCODING_UTF8);
    aPresPoint.mpShape.reset(new Shape());
    aPresPoint.msPresentationAssociationId = aDataPoint.msModelId;
    if (!sPresSibling.isEmpty())
    {
        // no idea where to get these values from, so copy from previous sibling
        const dgm::Point* pSiblingPoint = maPointNameMap[sPresSibling];
        aPresPoint.msPresentationLayoutName = pSiblingPoint->msPresentationLayoutName;
        aPresPoint.msPresentationLayoutStyleLabel = pSiblingPoint->msPresentationLayoutStyleLabel;
        aPresPoint.mnLayoutStyleIndex = pSiblingPoint->mnLayoutStyleIndex;
        aPresPoint.mnLayoutStyleCount = pSiblingPoint->mnLayoutStyleCount;
    }

    addConnection(XML_parOf, rDataRoot.msModelId, aDataPoint.msModelId);
    addConnection(XML_presParOf, sPresRoot, aPresPoint.msModelId);
    addConnection(XML_presOf, aDataPoint.msModelId, aPresPoint.msModelId);

    // adding at the end, so that references are not invalidated in between
    maPoints.push_back(aDataPoint);
    maPoints.push_back(aPresPoint);

    build();
    return sNewNodeId;
}

bool DiagramData::removeNode(const OUString& rNodeId)
{
    // check if it doesn't have children
    for (const auto& aCxn : maConnections)
        if (aCxn.mnType == XML_parOf && aCxn.msSourceId == rNodeId)
        {
            SAL_WARN("oox.drawingml", "Node has children - can't be removed");
            return false;
        }

    dgm::Connection aParCxn;
    for (const auto& aCxn : maConnections)
        if (aCxn.mnType == XML_parOf && aCxn.msDestId == rNodeId)
            aParCxn = aCxn;

    std::unordered_set<OUString> aIdsToRemove;
    aIdsToRemove.insert(rNodeId);
    if (!aParCxn.msParTransId.isEmpty())
        aIdsToRemove.insert(aParCxn.msParTransId);
    if (!aParCxn.msSibTransId.isEmpty())
        aIdsToRemove.insert(aParCxn.msSibTransId);

    for (const dgm::Point& rPoint : maPoints)
        if (aIdsToRemove.count(rPoint.msPresentationAssociationId))
            aIdsToRemove.insert(rPoint.msModelId);

    // instert also transition nodes
    for (const auto& aCxn : maConnections)
        if (aIdsToRemove.count(aCxn.msSourceId) || aIdsToRemove.count(aCxn.msDestId))
            if (!aCxn.msPresId.isEmpty())
                aIdsToRemove.insert(aCxn.msPresId);

    // remove connections
    maConnections.erase(std::remove_if(maConnections.begin(), maConnections.end(),
                                       [aIdsToRemove](const dgm::Connection& rCxn) {
                                           return aIdsToRemove.count(rCxn.msSourceId) || aIdsToRemove.count(rCxn.msDestId);
                                       }),
                        maConnections.end());

    // remove data and presentation nodes
    maPoints.erase(std::remove_if(maPoints.begin(), maPoints.end(),
                                  [aIdsToRemove](const dgm::Point& rPoint) {
                                      return aIdsToRemove.count(rPoint.msModelId);
                                  }),
                   maPoints.end());

    // TODO: fix source/dest order

    build();
    return true;
}

#ifdef DEBUG_OOX_DIAGRAM
OString normalizeDotName( const OUString& rStr )
{
    OUStringBuffer aBuf;
    aBuf.append('N');

    const sal_Int32 nLen(rStr.getLength());
    sal_Int32 nCurrIndex(0);
    while( nCurrIndex < nLen )
    {
        const sal_Int32 aChar=rStr.iterateCodePoints(&nCurrIndex);
        if( aChar != '-' && aChar != '{' && aChar != '}' )
            aBuf.append((sal_Unicode)aChar);
    }

    return OUStringToOString(aBuf.makeStringAndClear(),
                                  RTL_TEXTENCODING_UTF8);
}
#endif

static sal_Int32 calcDepth( const OUString& rNodeName,
                            const dgm::Connections& rCnx )
{
    // find length of longest path in 'isChild' graph, ending with rNodeName
    for (auto const& elem : rCnx)
    {
        if( !elem.msParTransId.isEmpty() &&
            !elem.msSibTransId.isEmpty() &&
            !elem.msSourceId.isEmpty() &&
            !elem.msDestId.isEmpty() &&
            elem.mnType == XML_parOf &&
            rNodeName == elem.msDestId )
        {
            return calcDepth(elem.msSourceId, rCnx) + 1;
        }
    }

    return 0;
}

void DiagramData::build()
{
    // build name-object maps
    maPointNameMap.clear();
    maPointsPresNameMap.clear();
    maConnectionNameMap.clear();
    maPresOfNameMap.clear();

#ifdef DEBUG_OOX_DIAGRAM
    std::ofstream output("tree.dot");

    output << "digraph datatree {" << std::endl;
#endif
    dgm::Points& rPoints = getPoints();
    for (auto & point : rPoints)
    {
#ifdef DEBUG_OOX_DIAGRAM
        output << "\t"
               << normalizeDotName(point.msModelId).getStr()
               << "[";

        if( !point.msPresentationLayoutName.isEmpty() )
            output << "label=\""
                   << OUStringToOString(
                       point.msPresentationLayoutName,
                       RTL_TEXTENCODING_UTF8).getStr() << "\", ";
        else
            output << "label=\""
                   << OUStringToOString(
                       point.msModelId,
                       RTL_TEXTENCODING_UTF8).getStr() << "\", ";

        switch( point.mnType )
        {
            case XML_doc: output << "style=filled, color=red"; break;
            case XML_asst: output << "style=filled, color=green"; break;
            default:
            case XML_node: output << "style=filled, color=blue"; break;
            case XML_pres: output << "style=filled, color=yellow"; break;
            case XML_parTrans: output << "color=grey"; break;
            case XML_sibTrans: output << " "; break;
        }

        output << "];" << std::endl;
#endif

        // does currpoint have any text set?
        if( point.mpShape &&
            point.mpShape->getTextBody() &&
            !point.mpShape->getTextBody()->getParagraphs().empty() &&
            !point.mpShape->getTextBody()->getParagraphs().front()->getRuns().empty() )
        {
#ifdef DEBUG_OOX_DIAGRAM
            static sal_Int32 nCount=0;
            output << "\t"
                   << "textNode" << nCount
                   << " ["
                   << "label=\""
                   << OUStringToOString(
                       point.mpShape->getTextBody()->getParagraphs().front()->getRuns().front()->getText(),
                       RTL_TEXTENCODING_UTF8).getStr()
                   << "\"" << "];" << std::endl;
            output << "\t"
                   << normalizeDotName(point.msModelId).getStr()
                   << " -> "
                   << "textNode" << nCount++
                   << ";" << std::endl;
#endif
        }

        const bool bInserted1 = getPointNameMap().insert(
            std::make_pair(point.msModelId,&point)).second;

        SAL_WARN_IF(!bInserted1, "oox.drawingml", "DiagramData::build(): non-unique point model id");

        if( !point.msPresentationLayoutName.isEmpty() )
        {
            DiagramData::PointsNameMap::value_type::second_type& rVec=
                getPointsPresNameMap()[point.msPresentationLayoutName];
            rVec.push_back(&point);
        }
    }

    const dgm::Connections& rConnections = getConnections();
    for (auto const& connection : rConnections)
    {
#ifdef DEBUG_OOX_DIAGRAM
        if( !connection.msParTransId.isEmpty() ||
            !connection.msSibTransId.isEmpty() )
        {
            if( !connection.msSourceId.isEmpty() ||
                !connection.msDestId.isEmpty() )
            {
                output << "\t"
                       << normalizeDotName(connection.msSourceId).getStr()
                       << " -> "
                       << normalizeDotName(connection.msParTransId).getStr()
                       << " -> "
                       << normalizeDotName(connection.msSibTransId).getStr()
                       << " -> "
                       << normalizeDotName(connection.msDestId).getStr()
                       << " [style=dotted,"
                       << ((connection.mnType == XML_presOf) ? " color=red, " : ((connection.mnType == XML_presParOf) ? " color=green, " : " "))
                       << "label=\""
                       << OUStringToOString(connection.msModelId,
                                                 RTL_TEXTENCODING_UTF8 ).getStr()
                       << "\"];" << std::endl;
            }
            else
            {
                output << "\t"
                       << normalizeDotName(connection.msParTransId).getStr()
                       << " -> "
                       << normalizeDotName(connection.msSibTransId).getStr()
                       << " ["
                       << ((connection.mnType == XML_presOf) ? " color=red, " : ((connection.mnType == XML_presParOf) ? " color=green, " : " "))
                       << "label=\""
                       << OUStringToOString(connection.msModelId,
                                                 RTL_TEXTENCODING_UTF8 ).getStr()
                       << "\"];" << std::endl;
            }
        }
        else if( !connection.msSourceId.isEmpty() ||
                 !connection.msDestId.isEmpty() )
            output << "\t"
                   << normalizeDotName(connection.msSourceId).getStr()
                   << " -> "
                   << normalizeDotName(connection.msDestId).getStr()
                   << " [label=\""
                   << OUStringToOString(connection.msModelId,
                                             RTL_TEXTENCODING_UTF8 ).getStr()
                   << ((connection.mnType == XML_presOf) ? "\", color=red]" : ((connection.mnType == XML_presParOf) ? "\", color=green]" : "\"]"))
                   << ";" << std::endl;
#endif

        const bool bInserted1 = getConnectionNameMap().insert(
            std::make_pair(connection.msModelId,&connection)).second;

        SAL_WARN_IF(!bInserted1, "oox.drawingml", "DiagramData::build(): non-unique connection model id");

        if( connection.mnType == XML_presOf )
        {
            DiagramData::StringMap::value_type::second_type& rVec = getPresOfNameMap()[connection.msDestId];
            rVec[connection.mnDestOrder] = { connection.msSourceId, sal_Int32(0) };
        }
    }

    // assign outline levels
    DiagramData::StringMap& rStringMap = getPresOfNameMap();
    for (auto & elemPresOf : rStringMap)
    {
        for (auto & elem : elemPresOf.second)
        {
            const sal_Int32 nDepth = calcDepth(elem.second.msSourceId, getConnections());
            elem.second.mnDepth = nDepth != 0 ? nDepth : -1;
        }
    }
#ifdef DEBUG_OOX_DIAGRAM
    output << "}" << std::endl;
#endif
}

} }

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