#include "SubConfig.hpp"

SubConfig::SubConfig(BaseConfig & model) : model(model)
{
  update();
}

bool SubConfig::update()
{
  unsigned int currentLastLineIndex = firstLineIndex + getNbLines();

  if (currentLastLineIndex >= model.getNbLines()-1)
    return false;

  unsigned int newFirstLineIndex = firstLineIndex + 0.8*(currentLastLineIndex-firstLineIndex);
  unsigned int newLastLineIndex = std::min(newFirstLineIndex + spanSize, model.getNbLines());
  unsigned int newLineNumber = newLastLineIndex - newFirstLineIndex;

  if (getNbLines() < newLineNumber)
    resizeLines(newLineNumber);

  {
    auto linesBegin = getIterator(0, firstLineIndex, 0);
    auto firstToSave = getConstIterator(0, newFirstLineIndex, 0);
    auto lastToSave = getConstIterator(0, currentLastLineIndex, 0);

    while (firstToSave != lastToSave)
      (*linesBegin++) = (*firstToSave++);
  }

  if (getNbLines() > newLineNumber)
    resizeLines(newLineNumber);

  {
    unsigned int nbLinesCopied = currentLastLineIndex - newFirstLineIndex;
    auto newlinesBegin = getIterator(0, firstLineIndex+nbLinesCopied, 0);
    auto firstToSave = model.getConstIterator(0, currentLastLineIndex, 0);
    auto lastToSave = model.getConstIterator(0, newLastLineIndex, 0);

    while (firstToSave != lastToSave)
      (*newlinesBegin++) = (*firstToSave++);

    firstLineIndex = newFirstLineIndex;
  }

  return true;
}

std::size_t SubConfig::getNbColumns() const
{
  return model.getNbColumns();
}

std::size_t SubConfig::getColIndex(const std::string & colName) const
{
  return model.getColIndex(colName);
}

const std::string & SubConfig::getColName(int colIndex) const
{
  return model.getColName(colIndex);
}

std::size_t SubConfig::getFirstLineIndex() const
{
  return firstLineIndex;
}