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// Author: Ivana Hrivnacova, IJCLab IN2P3/CNRS, 07/09/2015

//
// public functions
//

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>::G4AccValue(
  const G4String& name, T initValue, G4MergeMode mergeMode)
 : G4VAccumulable(name, mergeMode),
   fValue(initValue),
   fInitValue(initValue),
   fMergeFunction(G4Accumulables::GetMergeFunction<T>(mergeMode))
{}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>::G4AccValue(T initValue, G4MergeMode mergeMode)
 : G4VAccumulable(),
   fValue(initValue),
   fInitValue(initValue),
   fMergeFunction(G4Accumulables::GetMergeFunction<T>(mergeMode))
{}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>::G4AccValue(const G4AccValue& rhs)
  : G4VAccumulable(rhs),
    fValue(rhs.fValue),
    fInitValue(rhs.fInitValue),
    fMergeFunction(rhs.fMergeFunction)
{}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>::G4AccValue(G4AccValue&& rhs) noexcept
  : G4VAccumulable(std::move(rhs)),
    fValue(std::move(rhs.fValue)),
    fInitValue(std::move(rhs.fInitValue)),
    fMergeFunction(rhs.fMergeFunction)
{}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>&
G4AccValue<T>::operator=(const G4AccValue<T>& rhs)
{
  // check assignment to self
  if (this == &rhs) {
    return *this;
  }

  // base class assignment
  G4VAccumulable::operator=(rhs);

  // this class data assignment
  fValue = rhs.fValue;
  fInitValue = rhs.fInitValue;
  fMergeFunction = rhs.fMergeFunction;

  return *this;
}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>& G4AccValue<T>::operator=(G4AccValue<T>&& rhs) noexcept
{
  // check assignment to self
  if (this == &rhs) {
    return *this;
  }

  // base class assignment
  G4VAccumulable::operator=(rhs);

  // this class data assignment
  fValue = std::move(rhs.fValue);
  fInitValue = std::move(rhs.fInitValue);
  fMergeFunction = rhs.fMergeFunction;

  return *this;
}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>&
G4AccValue<T>::operator+=(const G4AccValue<T>& rhs)
{
  // only update the value from rhs
  fValue += rhs.fValue;
  return *this;
}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>&
G4AccValue<T>::operator*=(const G4AccValue<T>& rhs)
{
  // only update the value from rhs
  fValue *= rhs.fValue;
  return *this;
}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>&
G4AccValue<T>::operator=(const T& value)
{
  // only update the value
  fValue = value;
  return *this;
}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>&
G4AccValue<T>::operator+=(const T& value)
{
  // only update the value
  fValue += value;
  return *this;
}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>&
G4AccValue<T>::operator*=(const T& value)
{
  // only update the value from rhs
  fValue *= value;
  return *this;
}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>
G4AccValue<T>::operator++(int)
{
  // postfix increment
  G4AccValue<T> temp = *this;
  fValue++;
  return temp;
}

//_____________________________________________________________________________
template <typename T>
G4AccValue<T>&
G4AccValue<T>::operator++()
{
  // prefix increment
  fValue++;
  return *this;
}

//_____________________________________________________________________________
template <typename T>
void G4AccValue<T>::Merge(const G4VAccumulable& other)
{
  if (G4Accumulables::VerboseLevel > 2 ) {
    G4cout << "Merging other: " << other.GetName() << " "
            << static_cast<const G4AccValue<T>&>(other).fValue << G4endl;
    G4cout << "    to master: " << fName << " " << fValue << G4endl;
  }

  fValue = fMergeFunction(fValue, static_cast<const G4AccValue<T>&>(other).fValue);

  if (G4Accumulables::VerboseLevel > 2 ) {
    G4cout << "    new value: " << fName << " " << fValue << G4endl;
  }
}

//_____________________________________________________________________________
template <typename T>
void G4AccValue<T>::Reset()
{
  fValue = fInitValue;
}

//_____________________________________________________________________________
template <typename T>
void G4AccValue<T>::Print(G4PrintOptions options) const
{
  if (options.Has(G4PrintOptions::kType)) {
    G4cout << typeid(T).name() << ": ";
  }

  PrintBase(options);

  G4cout << fValue << G4endl;
}

//_____________________________________________________________________________
template <class T>
void  G4AccValue<T>::SetMergeMode(G4MergeMode value)
{
  G4VAccumulable::SetMergeMode(value);
  fMergeFunction = G4Accumulables::GetMergeFunction<T>(fMergeMode);
}

//_____________________________________________________________________________
template <typename T>
T  G4AccValue<T>::GetValue() const
{
  return fValue;
}