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#pragma once

#include <thrust/detail/config.h>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

#include <thrust/system/hip/config.h>

#include <thrust/advance.h>
#include <thrust/system/hip/detail/cross_system.h>
#include <thrust/system/hip/detail/execution_policy.h>

THRUST_NAMESPACE_BEGIN

template <typename DerivedPolicy, typename InputIt, typename OutputIt>
THRUST_HOST_DEVICE OutputIt
copy(const thrust::detail::execution_policy_base<DerivedPolicy>& exec, InputIt first, InputIt last, OutputIt result);

template <class DerivedPolicy, class InputIt, class Size, class OutputIt>
THRUST_HOST_DEVICE OutputIt
copy_n(const thrust::detail::execution_policy_base<DerivedPolicy>& exec, InputIt first, Size n, OutputIt result);

namespace hip_rocprim
{

// D->D copy requires HIP compiler
template <class System, class InputIterator, class OutputIterator>
OutputIterator THRUST_HOST_DEVICE
copy(execution_policy<System>& system, InputIterator first, InputIterator last, OutputIterator result);

template <class System1, class System2, class InputIterator, class OutputIterator>
OutputIterator THRUST_HOST
copy(cross_system<System1, System2> systems, InputIterator first, InputIterator last, OutputIterator result);

template <class System, class InputIterator, class Size, class OutputIterator>
OutputIterator THRUST_HOST_DEVICE
copy_n(execution_policy<System>& system, InputIterator first, Size n, OutputIterator result);

template <class System1, class System2, class InputIterator, class Size, class OutputIterator>
OutputIterator THRUST_HOST
copy_n(cross_system<System1, System2> systems, InputIterator first, Size n, OutputIterator result);

} // namespace hip_rocprim
THRUST_NAMESPACE_END

#include <thrust/system/hip/detail/internal/copy_cross_system.h>
#include <thrust/system/hip/detail/internal/copy_device_to_device.h>
#include <thrust/system/hip/detail/par_to_seq.h>

THRUST_NAMESPACE_BEGIN
namespace hip_rocprim
{

#if THRUST_DEVICE_COMPILER == THRUST_DEVICE_COMPILER_HIP
// D->D copy requires HIP compiler

THRUST_EXEC_CHECK_DISABLE
template <class System, class InputIterator, class OutputIterator>
OutputIterator THRUST_HOST_DEVICE
copy(execution_policy<System>& system, InputIterator first, InputIterator last, OutputIterator result)
{
  // struct workaround is required for HIP-clang
  struct workaround
  {
    THRUST_HOST static OutputIterator
    par(execution_policy<System>& system, InputIterator first, InputIterator last, OutputIterator result)
    {
      return result = __copy::device_to_device(system, first, last, result);
    }
#  if !__THRUST_HAS_HIPRT__
    THRUST_DEVICE static OutputIterator
    seq(execution_policy<System>& system, InputIterator first, InputIterator last, OutputIterator result)
    {
      return result = thrust::copy(cvt_to_seq(derived_cast(system)), first, last, result);
    }
#  endif
  };
#  if __THRUST_HAS_HIPRT__
  return workaround::par(system, first, last, result);
#  else
  return workaround::seq(system, first, last, result);
#  endif
} // end copy()

THRUST_EXEC_CHECK_DISABLE
template <class System, class InputIterator, class Size, class OutputIterator>
OutputIterator THRUST_HOST_DEVICE
copy_n(execution_policy<System>& system, InputIterator first, Size n, OutputIterator result)
{
  // struct workaround is required for HIP-clang
  struct workaround
  {
    THRUST_HOST static OutputIterator
    par(execution_policy<System>& system, InputIterator first, Size n, OutputIterator result)
    {
      return result = __copy::device_to_device(system, first, thrust::next(first, n), result);
    }
#  if !__THRUST_HAS_HIPRT__
    THRUST_DEVICE static OutputIterator
    seq(execution_policy<System>& system, InputIterator first, Size n, OutputIterator result)
    {
      return result = thrust::copy_n(cvt_to_seq(derived_cast(system)), first, n, result);
    }
#  endif
  };
#  if __THRUST_HAS_HIPRT__
  return workaround::par(system, first, n, result);
#  else
  return workaround::seq(system, first, n, result);
#  endif
} // end copy_n()
#endif

template <class System1, class System2, class InputIterator, class OutputIterator>
OutputIterator THRUST_HOST
copy(cross_system<System1, System2> systems, InputIterator first, InputIterator last, OutputIterator result)
{
  return __copy::cross_system_copy(systems, first, last, result);
} // end copy()

template <class System1, class System2, class InputIterator, class Size, class OutputIterator>
OutputIterator THRUST_HOST
copy_n(cross_system<System1, System2> systems, InputIterator first, Size n, OutputIterator result)
{
  return __copy::cross_system_copy_n(systems, first, n, result);
} // end copy_n()

} // namespace hip_rocprim
THRUST_NAMESPACE_END

#include <thrust/detail/temporary_array.h>
#include <thrust/memory.h>
