/* -*- 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 <sal/config.h>

#include <cstddef>
#include <fstream>
#include <iterator>
#include <memory>
#include <string>

#include <po.hxx>
#include <lngmerge.hxx>

namespace {

bool lcl_isNextGroup(OString &sGroup_out, const OString &sLineTrim)
{
    if (sLineTrim.startsWith("[") && sLineTrim.endsWith("]"))
    {
        sGroup_out = sLineTrim.getToken(1, '[').getToken(0, ']').trim();
        return true;
    }
    return false;
}

void lcl_RemoveUTF8ByteOrderMarker( OString &rString )
{
    if( rString.getLength() >= 3 && rString[0] == '\xEF' &&
        rString[1] == '\xBB' && rString[2] == '\xBF' )
    {
        rString = rString.copy(3);
    }
}

}


// class LngParser

LngParser::LngParser(const OString &rLngFile)
    : sSource( rLngFile )
{
    std::ifstream aStream(sSource.getStr());
    if (aStream.is_open())
    {
        bool bFirstLine = true;
        std::string s;
        std::getline(aStream, s);
        while (!aStream.eof())
        {
            OString sLine(s.data(), s.length());

            if( bFirstLine )
            {
                // Always remove UTF8 BOM from the first line
                lcl_RemoveUTF8ByteOrderMarker( sLine );
                bFirstLine = false;
            }

            mvLines.push_back( sLine );
            std::getline(aStream, s);
        }
        mvLines.push_back( OString() );
    }
}

LngParser::~LngParser()
{
}

void LngParser::CreatePO( const OString &rPOFile )
{
    PoOfstream aPOStream( rPOFile, PoOfstream::APP );
    if (!aPOStream.isOpen()) {
        std::cerr << "Ulfex error: Can't open po file:" << rPOFile << "\n";
    }

    size_t nPos  = 0;
    bool bStart = true;
    OString sGroup, sLine;
    OStringHashMap Text;
    OString sID;

    while( nPos < mvLines.size() ) {
        sLine = mvLines[ nPos++ ];
        while( nPos < mvLines.size() && !isNextGroup( sGroup , sLine ) ) {
            ReadLine( sLine , Text );
            sID = sGroup;
            sLine = mvLines[ nPos++ ];
        }
        if( bStart ) {
            bStart = false;
            sID = sGroup;
        }
        else {
            WritePO( aPOStream , Text , sSource , sID );
        }
        Text.erase("x-comment");
    }
    aPOStream.close();
}

void LngParser::WritePO(PoOfstream &aPOStream,
    OStringHashMap &rText_inout, const OString &rActFileName,
    const OString &rID)
{
    common::writePoEntry(
        "Ulfex", aPOStream, rActFileName, "LngText",
        rID, OString(), rText_inout.count("x-comment") ? rText_inout["x-comment"] : OString(), rText_inout["en-US"]);
}

bool LngParser::isNextGroup(OString &sGroup_out, const OString &sLine_in)
{
    return lcl_isNextGroup(sGroup_out, sLine_in.trim());
}

void LngParser::ReadLine(const OString &rLine_in,
        OStringHashMap &rText_inout)
{
    if (!rLine_in.match(" *") && !rLine_in.match("/*"))
    {
        OString sLang(rLine_in.getToken(0, '=').trim());
        if (!sLang.isEmpty()) {
            OString sText(rLine_in.getToken(1, '"'));
            rText_inout[sLang] = sText;
        }
    }
}

void LngParser::Merge(
    const OString &rPOFile,
    const OString &rDestinationFile,
    const OString &rLanguage )
{
    std::ofstream aDestination(
        rDestinationFile.getStr(), std::ios_base::out | std::ios_base::trunc);

    MergeDataFile aMergeDataFile( rPOFile, sSource, false, true );
    if( rLanguage.equalsIgnoreAsciiCase("ALL") )
        aLanguages = aMergeDataFile.GetLanguages();

    size_t nPos = 0;
    bool bGroup = false;
    OString sGroup;

    // seek to next group
    while ( nPos < mvLines.size() && !bGroup )
        bGroup = lcl_isNextGroup(sGroup, mvLines[nPos++].trim());

    while ( nPos < mvLines.size()) {
        OStringHashMap Text;
        OString sID( sGroup );
        std::size_t nLastLangPos = 0;

        std::unique_ptr<ResData> pResData( new ResData( sID, sSource ) );
        pResData->sResTyp = "LngText";
        MergeEntrys *pEntrys = aMergeDataFile.GetMergeEntrys( pResData.get() );
        // read languages
        bGroup = false;

        OString sLanguagesDone;

        while ( nPos < mvLines.size() && !bGroup )
        {
            const OString sLine{ mvLines[nPos].trim() };
            if ( lcl_isNextGroup(sGroup, sLine) )
            {
                bGroup = true;
                nPos ++;
                sLanguagesDone = "";
            }
            else
            {
                sal_Int32 n = 0;
                OString sLang(sLine.getToken(0, '=', n));
                if (n == -1 || static_cast<bool>(sLine.match("/*")))
                {
                    ++nPos;
                }
                else
                {
                    sLang = sLang.trim();

                    OString sSearch{ ";" + sLang + ";" };

                    if ( sLanguagesDone.indexOf( sSearch ) != -1 ) {
                        mvLines.erase( mvLines.begin() + nPos );
                    }
                    if( pEntrys )
                    {
                        if( !sLang.isEmpty() )
                        {
                            OString sNewText;
                            pEntrys->GetText( sNewText, sLang, true );
                            if( sLang == "qtz" )
                                continue;

                            if ( !sNewText.isEmpty()) {
                                mvLines[ nPos ] = sLang
                                    + " = \""
                                    // escape quotes, unescape double escaped quotes fdo#56648
                                    + sNewText.replaceAll("\"","\\\"").replaceAll("\\\\\"","\\\"")
                                    + "\"";
                                Text[ sLang ] = sNewText;
                            }
                        }
                        nLastLangPos = nPos;
                        nPos ++;
                        sLanguagesDone += sSearch;
                    }
                    else {
                        nLastLangPos = nPos;
                        nPos ++;
                        sLanguagesDone += sSearch;
                    }
                }
            }
        }
        OString sCur;
        if ( nLastLangPos )
        {
            for(size_t n = 0; n < aLanguages.size(); ++n)
            {
                sCur = aLanguages[ n ];
                if( !sCur.equalsIgnoreAsciiCase("en-US") && Text[sCur].isEmpty() && pEntrys )
                {

                    OString sNewText;
                    pEntrys->GetText( sNewText, sCur, true );
                    if( sCur == "qtz" )
                        continue;
                    if ( !sNewText.isEmpty() && sCur != "x-comment")
                    {
                        const OString sLine { sCur
                            + " = \""
                            // escape quotes, unescape double escaped quotes fdo#56648
                            + sNewText.replaceAll("\"","\\\"").replaceAll("\\\\\"","\\\"")
                            + "\"" };

                        nLastLangPos++;
                        nPos++;

                        if ( nLastLangPos < mvLines.size() ) {
                            mvLines.insert( mvLines.begin() + nLastLangPos, sLine );
                        } else {
                            mvLines.push_back( sLine );
                        }
                    }
                }
            }
        }
    }

    for ( size_t i = 0; i < mvLines.size(); ++i )
        aDestination << mvLines[i] << '\n';

    aDestination.close();
}

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