/*
    This file is part of Konsole, an X terminal.

    Copyright 2006-2008 by Robert Knight <robertknight@gmail.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301  USA.
*/

// Own
#include "TerminalCharacterDecoder.h"

// stdlib
#include <cwctype>

// Qt
#include <QTextStream>

// KDE
//#include <kdebug.h>

// Konsole
#include "konsole_wcwidth.h"

#include <cwctype>

using namespace Konsole;
PlainTextDecoder::PlainTextDecoder()
 : _output(nullptr)
 , _includeTrailingWhitespace(true)
 , _recordLinePositions(false)
{

}
void PlainTextDecoder::setTrailingWhitespace(bool enable)
{
    _includeTrailingWhitespace = enable;
}
bool PlainTextDecoder::trailingWhitespace() const
{
    return _includeTrailingWhitespace;
}
void PlainTextDecoder::begin(QTextStream* output)
{
   _output = output;
   if (!_linePositions.isEmpty())
       _linePositions.clear();
}
void PlainTextDecoder::end()
{
    _output = nullptr;
}

void PlainTextDecoder::setRecordLinePositions(bool record)
{
    _recordLinePositions = record;
}
QList<int> PlainTextDecoder::linePositions() const
{
    return _linePositions;
}

void PlainTextDecoder::decodeLine(std::span<const Character> characters, LineProperty /*properties*/)
{
    Q_ASSERT( _output );
    int count = characters.size();

    if (_recordLinePositions && _output->string())
    {
        int pos = _output->string()->count();
        _linePositions << pos;
    }

    // check the real length
    for (int i = 0 ; i < count ; i++)
    {
        if (characters.subspan(i).empty())
        {
            count = i;
            break;
        }
    }

    //TODO should we ignore or respect the LINE_WRAPPED line property?

    //note:  we build up a QString and send it to the text stream rather writing into the text
    //stream a character at a time because it is more efficient.
    //(since QTextStream always deals with QStrings internally anyway)
    QString plainText;
    plainText.reserve(count);

    int outputCount = count;

    // if inclusion of trailing whitespace is disabled then find the end of the
    // line
    if ( !_includeTrailingWhitespace )
    {
        for (int i = count-1 ; i >= 0 ; i--)
        {
            if ( characters[i].character != u' '  )
                break;
            else
                outputCount--;
        }
    }

    for (int i=0;i<outputCount;)
    {
        plainText.push_back( characters[i].character );
        i += qMax(1,konsole_wcwidth(characters[i].character));
    }
    *_output << plainText;
}

