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#pragma once

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

BEGIN_NS_THRUST
namespace hip_rocprim
{

template <class Sys1, class Sys2>
struct cross_system : thrust::execution_policy<cross_system<Sys1, Sys2>>
{
    typedef thrust::execution_policy<Sys1> policy1;
    typedef thrust::execution_policy<Sys2> policy2;

    policy1& sys1;
    policy2& sys2;

    inline __host__ __device__
    cross_system(policy1& sys1, policy2& sys2):
        sys1(sys1),
        sys2(sys2)
    {
    }

    inline cross_system<Sys2, Sys1> __host__ __device__
    rotate() const
    {
        return cross_system<Sys2, Sys1>(sys2, sys1);
    }
};

// host interop: (device,host)
template <class Sys1, class Sys2>
inline cross_system<Sys1, Sys2> __host__ __device__
select_system(execution_policy<Sys1> const&              sys1,
              thrust::cpp::execution_policy<Sys2> const& sys2)
{
    thrust::execution_policy<Sys1>& non_const_sys1 = const_cast<execution_policy<Sys1>&>(sys1);
    thrust::cpp::execution_policy<Sys2>& non_const_sys2
        = const_cast<thrust::cpp::execution_policy<Sys2>&>(sys2);
    return cross_system<Sys1, Sys2>(non_const_sys1, non_const_sys2);
}

// host interop: (host,device)
template <class Sys1, class Sys2>
inline cross_system<Sys1, Sys2> __host__ __device__
select_system(const thrust::cpp::execution_policy<Sys1>& sys1,
              execution_policy<Sys2>&                    sys2)
{
    thrust::cpp::execution_policy<Sys1>& non_const_sys1
        = const_cast<thrust::cpp::execution_policy<Sys1>&>(sys1);
    thrust::execution_policy<Sys2>& non_const_sys2 = const_cast<execution_policy<Sys2>&>(sys2);
    return cross_system<Sys1, Sys2>(non_const_sys1, non_const_sys2);
}

} // namespace hip_rocprim
END_NS_THRUST