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#pragma once

#include <thrust/detail/config.h>

#include <thrust/detail/allocator_aware_execution_policy.h>
#include <thrust/detail/dependencies_aware_execution_policy.h>
#include <thrust/system/hip/detail/execution_policy.h>
#include <thrust/system/hip/detail/guarded_hip_runtime_api.h>
#include <thrust/system/hip/detail/util.h>

THRUST_NAMESPACE_BEGIN
namespace hip_rocprim
{

template <class Derived>
struct execute_on_stream_base : execution_policy<Derived>
{
private:
  hipStream_t stream;

public:
  THRUST_EXEC_CHECK_DISABLE
  THRUST_HOST_DEVICE execute_on_stream_base(hipStream_t stream_ = default_stream())
      : stream(stream_)
  {}

  THRUST_HIP_RUNTIME_FUNCTION
  Derived on(hipStream_t const& s) const
  {
    Derived result = derived_cast(*this);
    result.stream  = s;
    return result;
  }

private:
  friend hipStream_t THRUST_HOST_DEVICE get_stream(const execute_on_stream_base& exec)
  {
    return exec.stream;
  }
};

struct execute_on_stream : execute_on_stream_base<execute_on_stream>
{
  using base_t = execute_on_stream_base<execute_on_stream>;

  THRUST_HOST_DEVICE execute_on_stream()
      : base_t(){};
  THRUST_HOST_DEVICE execute_on_stream(hipStream_t stream)
      : base_t(stream){};
};

template <class Derived>
struct execute_on_stream_nosync_base : execute_on_stream_base<Derived>
{
private:
  using base_t = execute_on_stream_base<Derived>;

public:
  THRUST_HOST_DEVICE execute_on_stream_nosync_base()
      : base_t(){};
  THRUST_HOST_DEVICE execute_on_stream_nosync_base(hipStream_t stream)
      : base_t(stream){};

private:
  friend THRUST_HOST_DEVICE bool must_perform_optional_stream_synchronization(const execute_on_stream_nosync_base&)
  {
    return false;
  }
};

struct execute_on_stream_nosync : execute_on_stream_nosync_base<execute_on_stream_nosync>
{
  using base_t = execute_on_stream_nosync_base<execute_on_stream_nosync>;

  THRUST_HOST_DEVICE execute_on_stream_nosync()
      : base_t(){};
  THRUST_HOST_DEVICE execute_on_stream_nosync(hipStream_t stream)
      : base_t(stream){};
};

struct par_t
    : execution_policy<par_t>
    , thrust::detail::allocator_aware_execution_policy<execute_on_stream_base>
    , thrust::detail::dependencies_aware_execution_policy<execute_on_stream_base>
{
  using base_t = execution_policy<par_t>;

  THRUST_DEVICE THRUST_HOST constexpr par_t()
      : base_t()
  {}

  using stream_attachment_type = execute_on_stream;

  THRUST_HIP_RUNTIME_FUNCTION
  stream_attachment_type on(hipStream_t const& stream) const
  {
    return execute_on_stream(stream);
  }
};

struct par_nosync_t
    : execution_policy<par_nosync_t>
    , thrust::detail::allocator_aware_execution_policy<execute_on_stream_nosync_base>
    , thrust::detail::dependencies_aware_execution_policy<execute_on_stream_nosync_base>
{
  using base_t = execution_policy<par_nosync_t>;

  THRUST_HOST_DEVICE constexpr par_nosync_t()
      : base_t()
  {}

  using stream_attachment_type = execute_on_stream_nosync;

  THRUST_HIP_RUNTIME_FUNCTION
  stream_attachment_type on(hipStream_t const& stream) const
  {
    return execute_on_stream_nosync(stream);
  }

private:
  // this function is defined to allow non-blocking calls on the default_stream() with thrust::cuda::par_nosync
  // without explicitly using thrust::cuda::par_nosync.on(default_stream())
  friend THRUST_HOST_DEVICE bool must_perform_optional_stream_synchronization(const par_nosync_t&)
  {
    return false;
  }
};

template <class Derived>
struct execute_on_stream_deterministic_base : execute_on_stream_base<Derived>
{
private:
  using base_t = execute_on_stream_base<Derived>;

public:
  THRUST_HOST_DEVICE execute_on_stream_deterministic_base()
      : base_t(){};
  THRUST_HOST_DEVICE execute_on_stream_deterministic_base(hipStream_t stream)
      : base_t(stream){};

private:
  friend THRUST_HOST_DEVICE integral_constant<bool, false>
  allows_nondeterminism(const execute_on_stream_deterministic_base&)
  {
    return {};
  }
};

struct execute_on_stream_deterministic : execute_on_stream_deterministic_base<execute_on_stream_deterministic>
{
  using base_t = execute_on_stream_deterministic_base<execute_on_stream_deterministic>;

  THRUST_HOST_DEVICE execute_on_stream_deterministic()
      : base_t(){};
  THRUST_HOST_DEVICE execute_on_stream_deterministic(hipStream_t stream)
      : base_t(stream){};
};

struct par_det_t
    : execution_policy<par_det_t>
    , thrust::detail::allocator_aware_execution_policy<execute_on_stream_deterministic_base>
    , thrust::detail::dependencies_aware_execution_policy<execute_on_stream_deterministic_base>
{
  using base_t = execution_policy<par_det_t>;

  THRUST_HOST_DEVICE constexpr par_det_t()
      : base_t()
  {}

  using stream_attachment_type = execute_on_stream_deterministic;

  THRUST_HIP_RUNTIME_FUNCTION
  stream_attachment_type on(hipStream_t const& stream) const
  {
    return execute_on_stream_deterministic(stream);
  }

private:
  friend THRUST_HOST_DEVICE integral_constant<bool, false> allows_nondeterminism(const par_det_t&)
  {
    return {};
  }
};

template <class Derived>
struct execute_on_stream_nosync_deterministic_base : execute_on_stream_nosync_base<Derived>
{
private:
  using base_t = execute_on_stream_nosync_base<Derived>;

public:
  THRUST_HOST_DEVICE execute_on_stream_nosync_deterministic_base()
      : base_t(){};
  THRUST_HOST_DEVICE execute_on_stream_nosync_deterministic_base(hipStream_t stream)
      : base_t(stream){};

private:
  friend THRUST_HOST_DEVICE integral_constant<bool, false>
  allows_nondeterminism(const execute_on_stream_nosync_deterministic_base&)
  {
    return {};
  }
};

struct execute_on_stream_nosync_deterministic
    : execute_on_stream_nosync_deterministic_base<execute_on_stream_nosync_deterministic>
{
  using base_t = execute_on_stream_nosync_deterministic_base<execute_on_stream_nosync_deterministic>;

  THRUST_HOST_DEVICE execute_on_stream_nosync_deterministic()
      : base_t(){};
  THRUST_HOST_DEVICE execute_on_stream_nosync_deterministic(hipStream_t stream)
      : base_t(stream){};
};

struct par_det_nosync_t
    : execution_policy<par_det_nosync_t>
    , thrust::detail::allocator_aware_execution_policy<execute_on_stream_nosync_deterministic_base>
    , thrust::detail::dependencies_aware_execution_policy<execute_on_stream_nosync_deterministic_base>
{
  using base_t = execution_policy<par_det_nosync_t>;

  THRUST_HOST_DEVICE constexpr par_det_nosync_t()
      : base_t()
  {}

  using stream_attachment_type = execute_on_stream_nosync_deterministic;

  THRUST_HIP_RUNTIME_FUNCTION
  stream_attachment_type on(hipStream_t const& stream) const
  {
    return execute_on_stream_nosync_deterministic(stream);
  }

private:
  friend THRUST_HOST_DEVICE integral_constant<bool, false> allows_nondeterminism(const par_det_nosync_t&)
  {
    return {};
  }
};

THRUST_INLINE_CONSTANT par_t par;
THRUST_INLINE_CONSTANT par_nosync_t par_nosync;
THRUST_INLINE_CONSTANT par_det_t par_det;
THRUST_INLINE_CONSTANT par_det_nosync_t par_det_nosync;
} // namespace hip_rocprim

namespace system
{
namespace hip
{
using thrust::hip_rocprim::par;
using thrust::hip_rocprim::par_det;
using thrust::hip_rocprim::par_det_nosync;
using thrust::hip_rocprim::par_nosync;
namespace detail
{
using thrust::hip_rocprim::par_det_nosync_t;
using thrust::hip_rocprim::par_det_t;
using thrust::hip_rocprim::par_nosync_t;
using thrust::hip_rocprim::par_t;
} // namespace detail
} // namespace hip
} // namespace system

namespace hip
{
using thrust::hip_rocprim::par;
using thrust::hip_rocprim::par_det;
using thrust::hip_rocprim::par_det_nosync;
using thrust::hip_rocprim::par_nosync;
} // namespace hip

THRUST_NAMESPACE_END
