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#pragma once

#include <thrust/detail/allocator/allocator_traits.h>
#include <thrust/detail/config.h>
#include <thrust/detail/execute_with_allocator.h>
#include <thrust/system/hip/detail/execution_policy.h>

BEGIN_NS_THRUST
namespace hip_rocprim
{

    __host__ __device__ inline hipStream_t default_stream()
    {
        return hipStreamDefault; // There's not hipStreamLegacy
    }

    template <class Derived>
    hipStream_t __host__ __device__ get_stream(execution_policy<Derived>&)
    {
        return default_stream();
    }

    template <class Derived>
    hipError_t THRUST_HIP_RUNTIME_FUNCTION synchronize_stream(execution_policy<Derived>&)
    {
        hipDeviceSynchronize();
        return hipGetLastError();
    }

    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_)
        {
        }

        __host__ __device__ 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(execute_on_stream_base& exec)
        {
            return exec.stream;
        }

        friend hipError_t THRUST_HIP_RUNTIME_FUNCTION
                          synchronize_stream(execute_on_stream_base& exec)
        {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __THRUST_HAS_HIPRT__
            THRUST_UNUSED_VAR(exec);
            hipDeviceSynchronize();
#endif
#else
            hipStreamSynchronize(exec.stream);
#endif
            return hipGetLastError();
        }
    };

    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) {};
    };

    struct par_t : execution_policy<par_t>
    {
        typedef execution_policy<par_t> base_t;

        __device__ __host__ par_t()
            : base_t()
        {
        }

        template <class Allocator>
        struct enable_alloc
        {
            typedef typename thrust::detail::enable_if<
                thrust::detail::is_allocator<Allocator>::value,
                thrust::detail::execute_with_allocator<Allocator, execute_on_stream_base>>::type
                type;
        };

        template <class Allocator>
        __host__ __device__ typename enable_alloc<Allocator>::type
                 operator()(Allocator& alloc) const
        {
            return thrust::detail::execute_with_allocator<Allocator, execute_on_stream_base>(alloc);
        }

        execute_on_stream __device__ __host__ on(hipStream_t const& stream) const
        {
            return execute_on_stream(stream);
        }
    };

#ifdef __HIP_DEVICE_COMPILE__
    static const __device__ par_t par;
#else
    static const par_t par;
#endif
} // namespace hip_rocprim

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

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

END_NS_THRUST