/*
 *  Copyright 2008-2013 NVIDIA Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#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/detail/copy.h>
#include <thrust/detail/nvtx_policy.h>
#include <thrust/system/detail/generic/select_system.h>

// Include all active backend system implementations (generic, sequential, host and device)
#include <thrust/system/detail/generic/copy.h>
#include <thrust/system/detail/sequential/copy.h>
#include __THRUST_HOST_SYSTEM_ALGORITH_DETAIL_HEADER_INCLUDE(copy.h)
#include __THRUST_DEVICE_SYSTEM_ALGORITH_DETAIL_HEADER_INCLUDE(copy.h)

// Some build systems need a hint to know which files we could include
#if 0
#  include <thrust/system/cpp/detail/copy.h>
#  include <thrust/system/cuda/detail/copy.h>
#  include <thrust/system/omp/detail/copy.h>
#  include <thrust/system/tbb/detail/copy.h>
#endif

THRUST_NAMESPACE_BEGIN

_CCCL_EXEC_CHECK_DISABLE
template <typename DerivedPolicy, typename InputIterator, typename OutputIterator>
_CCCL_HOST_DEVICE OutputIterator
copy(const thrust::detail::execution_policy_base<DerivedPolicy>& exec,
     InputIterator first,
     InputIterator last,
     OutputIterator result)
{
  _CCCL_NVTX_RANGE_SCOPE_IF(detail::should_enable_nvtx_for_policy<DerivedPolicy>(), "thrust::copy");
  using thrust::system::detail::generic::copy;
  return copy(thrust::detail::derived_cast(thrust::detail::strip_const(exec)), first, last, result);
} // end copy()

_CCCL_EXEC_CHECK_DISABLE
template <typename DerivedPolicy, typename InputIterator, typename Size, typename OutputIterator>
_CCCL_HOST_DEVICE OutputIterator copy_n(
  const thrust::detail::execution_policy_base<DerivedPolicy>& exec, InputIterator first, Size n, OutputIterator result)
{
  _CCCL_NVTX_RANGE_SCOPE_IF(detail::should_enable_nvtx_for_policy<DerivedPolicy>(), "thrust::copy_n");
  using thrust::system::detail::generic::copy_n;
  return copy_n(thrust::detail::derived_cast(thrust::detail::strip_const(exec)), first, n, result);
} // end copy_n()

namespace detail
{
_CCCL_EXEC_CHECK_DISABLE // because we might call e.g. std::ostream_iterator's constructor
template <typename System1, typename System2, typename InputIterator, typename OutputIterator>
_CCCL_HOST_DEVICE OutputIterator two_system_copy(
  const thrust::execution_policy<System1>& system1,
  const thrust::execution_policy<System2>& system2,
  InputIterator first,
  InputIterator last,
  OutputIterator result)
{
  _CCCL_NVTX_RANGE_SCOPE_IF(should_enable_nvtx_for_policy<System1>() || should_enable_nvtx_for_policy<System2>(),
                            "thrust::two_system_copy");
  using thrust::system::detail::generic::select_system;

  return thrust::copy(
    select_system(thrust::detail::derived_cast(thrust::detail::strip_const(system1)),
                  thrust::detail::derived_cast(thrust::detail::strip_const(system2))),
    first,
    last,
    result);
} // end two_system_copy()

_CCCL_EXEC_CHECK_DISABLE // because we might call e.g. std::ostream_iterator's constructor
template <typename System1, typename System2, typename InputIterator, typename Size, typename OutputIterator>
_CCCL_HOST_DEVICE OutputIterator two_system_copy_n(
  const thrust::execution_policy<System1>& system1,
  const thrust::execution_policy<System2>& system2,
  InputIterator first,
  Size n,
  OutputIterator result)
{
  _CCCL_NVTX_RANGE_SCOPE_IF(should_enable_nvtx_for_policy<System1>() || should_enable_nvtx_for_policy<System2>(),
                            "thrust::two_system_copy_n");
  using thrust::system::detail::generic::select_system;

  return thrust::copy_n(
    select_system(thrust::detail::derived_cast(thrust::detail::strip_const(system1)),
                  thrust::detail::derived_cast(thrust::detail::strip_const(system2))),
    first,
    n,
    result);
} // end two_system_copy_n()
} // namespace detail

template <typename InputIterator, typename OutputIterator>
OutputIterator copy(InputIterator first, InputIterator last, OutputIterator result)
{
  using System1 = typename thrust::iterator_system<InputIterator>::type;
  using System2 = typename thrust::iterator_system<OutputIterator>::type;
  _CCCL_NVTX_RANGE_SCOPE_IF(
    detail::should_enable_nvtx_for_policy<System1>() || detail::should_enable_nvtx_for_policy<System2>(),
    "thrust::copy");

  System1 system1;
  System2 system2;

  return thrust::detail::two_system_copy(system1, system2, first, last, result);
} // end copy()

template <typename InputIterator, typename Size, typename OutputIterator>
OutputIterator copy_n(InputIterator first, Size n, OutputIterator result)
{
  using System1 = typename thrust::iterator_system<InputIterator>::type;
  using System2 = typename thrust::iterator_system<OutputIterator>::type;
  _CCCL_NVTX_RANGE_SCOPE_IF(
    detail::should_enable_nvtx_for_policy<System1>() || detail::should_enable_nvtx_for_policy<System2>(),
    "thrust::copy_n");

  System1 system1;
  System2 system2;

  return thrust::detail::two_system_copy_n(system1, system2, first, n, result);
} // end copy_n()

THRUST_NAMESPACE_END
