/**
  * @RDE_HEADER@
  * ExerciseContext
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Christian Fröbel, SLSE, 2017-11-22
  */

#include "exercise_context.h"
#include <QString>

namespace
{

QString EX_PREFIX()       { return QStringLiteral("ex_"); }
QString DEFAULT_CONTEXT() { return QStringLiteral("Default"); } // case sensitive

} // anonymous namespace


namespace AudioVideoManagement
{

ExerciseContext ExerciseContext::fromByteArray(const QByteArray &s)
{
  return fromString(QString::fromLatin1(s));
}

ExerciseContext ExerciseContext::fromString(const QString &s)
{
  if (s == DEFAULT_CONTEXT())
    return ExerciseContext::defaultContext();

  Q_ASSERT(s.size() > EX_PREFIX().size());
  Q_ASSERT(s.startsWith(EX_PREFIX()));

  bool   couldConvert = false;
  int    exerciseId = s.midRef(EX_PREFIX().size()).toInt(&couldConvert);
  Q_ASSERT(couldConvert);
  return ExerciseContext(exerciseId);
}

QString ExerciseContext::toString() const
{
  if (isDefault())
    return DEFAULT_CONTEXT();
  else
    return EX_PREFIX() + QString::number(*m_exerciseId);
}

QByteArray ExerciseContext::toByteArray() const
{
  return toString().toLatin1();
}

bool ExerciseContext::operator<(const ExerciseContext &other) const
{
  return m_exerciseId.get_value_or(0) < other.m_exerciseId.get_value_or(0);
}

std::ostream &operator<<(std::ostream &os, const ExerciseContext &ctx)
{
  return os << ctx.toByteArray().constData();
}

} // namespace AudioVideoManagement