/*------------------------------- phasicFlow ---------------------------------
      O        C enter of
     O O       E ngineering and
    O   O      M ultiscale modeling of
   OOOOOOO     F luid flow
------------------------------------------------------------------------------
  Copyright (C): www.cemf.ir
  email: hamid.r.norouzi AT gmail.com
------------------------------------------------------------------------------
Licence:
  This file is part of phasicFlow code. It is a free software for simulating
  granular and multiphase flows. You can redistribute it and/or modify it under
  the terms of GNU General Public License v3 or any other later versions.

  phasicFlow is distributed to help others in their research in the field of
  granular and multiphase flows, but WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

-----------------------------------------------------------------------------*/
#ifndef __Range_hpp__
#define __Range_hpp__

#include <Kokkos_Core.hpp>

#include "builtinTypes.hpp"
#include "iOstream.hpp"
#include "pFlowMacros.hpp"
#include "typeInfo.hpp"

namespace pFlow
{

/**
 * Range for elements in an vector [start,end)
 *
 */
template<typename T>
struct Range : public Kokkos::pair<T, T>
{
	using Pair = Kokkos::pair<T, T>;

	TypeInfoTemplateNV11("Range", T)

	  //// - Constructors

	  /// Default
	  INLINE_FUNCTION_HD Range() = default;

	/// From end, set start to 0
	INLINE_FUNCTION_HD
	explicit Range(const T& e)
	  : Range(0, e)
	{
	}

	/// From componeents
	INLINE_FUNCTION_HD
	Range(const T& s, const T& e)
	  : Range::Pair(s, e)
	{
	}

	/// From pair
	INLINE_FUNCTION_HD
	Range(const Range::Pair& src)
	  : Range::Pair(src)
	{
	}

	/// Copy
	INLINE_FUNCTION_HD
	Range(const Range&) = default;

	/// Move
	INLINE_FUNCTION_HD
	Range(Range&&) = default;

	/// Copy assignment
	INLINE_FUNCTION_HD
	Range& operator=(const Range&) = default;

	/// Move assignment
	INLINE_FUNCTION_HD
	Range& operator=(Range&&) = default;

	/// Destructor
	INLINE_FUNCTION_HD
	~Range() = default;

	//// - Methods

	/// Start
	INLINE_FUNCTION_HD
	T& start()
	{
		return this->first;
	}

	/// End
	INLINE_FUNCTION_HD
	T& end()
	{
		return this->second;
	}

	INLINE_FUNCTION_HD
	const T& start() const
	{
		return this->first;
	}

	INLINE_FUNCTION_HD
	const T& end() const
	{
		return this->second;
	}

	INLINE_FUNCTION_HD
	T numElements()
	{
		return end() - start();
	}

	INLINE_FUNCTION_HD
	auto getPair() const
	{
		return Pair(this->first, this->second);
	}
};

template<typename T>
INLINE_FUNCTION_H iOstream&
operator<<(iOstream& os, const Range<T>& rng)
{
	os << "[" << rng.start() << " " << rng.end() << ")";
	return os;
}

using range32 = Range<int32>;

using range64 = Range<int64>;

using rangeU32 = Range<uint32>;

using rangeU64 = Range<uint64>;

} // pFlow

#endif //__KokkosTypes_hpp__
