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#pragma once

#include <thrust/detail/allocator_aware_execution_policy.h>
#include <thrust/detail/config.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:
        __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 __host__ __device__
        get_stream(const execute_on_stream_base& exec)
        {
            return exec.stream;
        }
    };

    struct execute_on_stream : execute_on_stream_base<execute_on_stream>
    {
        typedef execute_on_stream_base<execute_on_stream> base_t;

        __host__ __device__ execute_on_stream()
            : base_t() {};
        __host__ __device__ execute_on_stream(hipStream_t stream)
            : base_t(stream) {};
    };

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

    public:
        __host__ __device__
            execute_on_stream_nosync_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 __host__ __device__
        hipStream_t
        get_stream(const execute_on_stream_nosync_base &exec)
        {
            return exec.stream;
        }

        friend __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>
    {
        typedef execute_on_stream_nosync_base<execute_on_stream_nosync> base_t;

        __host__ __device__
        execute_on_stream_nosync() : base_t(){};
        __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>
    {
        typedef execution_policy<par_t> base_t;

        __device__ __host__
        constexpr par_t() : base_t()
        {
        }

        typedef execute_on_stream stream_attachment_type;

        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>
    {
        typedef execution_policy<par_nosync_t> base_t;

        __host__ __device__
        constexpr par_nosync_t() : base_t() {}

        typedef execute_on_stream_nosync stream_attachment_type;

        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 __host__ __device__  bool
        must_perform_optional_stream_synchronization(const par_nosync_t &)
        {
            return false;
        }
    };

THRUST_INLINE_CONSTANT par_t par;
THRUST_INLINE_CONSTANT par_nosync_t par_nosync;
} // namespace hip_rocprim

namespace system
{
    namespace hip
    {
        using thrust::hip_rocprim::par;
        using thrust::hip_rocprim::par_nosync;
        namespace detail
        {
            using thrust::hip_rocprim::par_t;
            using thrust::hip_rocprim::par_nosync_t;
        }
    } // namesapce hip
} // namespace system

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

THRUST_NAMESPACE_END
