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//
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// furnished to do so, subject to the following conditions:
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#ifndef ROCPRIM_BENCHMARK_DEVICE_PARTIAL_SORT_PARALLEL_HPP_
#define ROCPRIM_BENCHMARK_DEVICE_PARTIAL_SORT_PARALLEL_HPP_

#include "benchmark_utils.hpp"

// Google Benchmark
#include <benchmark/benchmark.h>

// HIP API
#include <hip/hip_runtime.h>

// rocPRIM
#include <rocprim/device/device_partial_sort.hpp>

#include <string>
#include <vector>

#include <cstddef>

template<typename Key = int, typename Config = rocprim::default_config>
struct device_partial_sort_benchmark : public config_autotune_interface
{
    bool small_n = false;

    device_partial_sort_benchmark(bool SmallN)
    {
        small_n = SmallN;
    }

    std::string name() const override
    {
        using namespace std::string_literals;
        return bench_naming::format_name(
            "{lvl:device,algo:partial_sort,nth:" + (small_n ? "small"s : "half"s)
            + ",key_type:" + std::string(Traits<Key>::name()) + ",cfg:default_config}");
    }

    static constexpr unsigned int batch_size  = 10;
    static constexpr unsigned int warmup_size = 5;

    void run(benchmark::State&   state,
             size_t              size,
             const managed_seed& seed,
             hipStream_t         stream) const override
    {
        using key_type = Key;

        size_t middle = 10;

        if(!small_n)
        {
            middle = size / 2;
        }

        // Generate data
        std::vector<key_type> keys_input;
        if(std::is_floating_point<key_type>::value)
        {
            keys_input = get_random_data<key_type>(size,
                                                   static_cast<key_type>(-1000),
                                                   static_cast<key_type>(1000),
                                                   seed.get_0());
        }
        else
        {
            keys_input = get_random_data<key_type>(size,
                                                   std::numeric_limits<key_type>::min(),
                                                   std::numeric_limits<key_type>::max(),
                                                   seed.get_0());
        }

        key_type* d_keys_input;
        key_type* d_keys_new_data;
        HIP_CHECK(hipMalloc(&d_keys_input, size * sizeof(*d_keys_input)));
        HIP_CHECK(hipMalloc(&d_keys_new_data, size * sizeof(*d_keys_new_data)));

        HIP_CHECK(hipMemcpy(d_keys_new_data,
                            keys_input.data(),
                            size * sizeof(*d_keys_input),
                            hipMemcpyHostToDevice));

        rocprim::less<key_type> lesser_op;
        void*                   d_temporary_storage     = nullptr;
        size_t                  temporary_storage_bytes = 0;
        HIP_CHECK(rocprim::partial_sort(d_temporary_storage,
                                        temporary_storage_bytes,
                                        d_keys_input,
                                        middle,
                                        size,
                                        lesser_op,
                                        stream,
                                        false));

        HIP_CHECK(hipMalloc(&d_temporary_storage, temporary_storage_bytes));

        // Warm-up
        for(size_t i = 0; i < warmup_size; i++)
        {
            HIP_CHECK(hipMemcpy(d_keys_input,
                                d_keys_new_data,
                                size * sizeof(*d_keys_input),
                                hipMemcpyDeviceToDevice));
            HIP_CHECK(rocprim::partial_sort(d_temporary_storage,
                                            temporary_storage_bytes,
                                            d_keys_input,
                                            middle,
                                            size,
                                            lesser_op,
                                            stream,
                                            false));
        }
        HIP_CHECK(hipDeviceSynchronize());

        // HIP events creation
        hipEvent_t start, stop;
        HIP_CHECK(hipEventCreate(&start));
        HIP_CHECK(hipEventCreate(&stop));

        for(auto _ : state)
        {
            float elapsed_mseconds = 0;
            for(size_t i = 0; i < batch_size; i++)
            {
                HIP_CHECK(hipMemcpy(d_keys_input,
                                    d_keys_new_data,
                                    size * sizeof(*d_keys_input),
                                    hipMemcpyDeviceToDevice));
                // Record start event
                HIP_CHECK(hipEventRecord(start, stream));
                HIP_CHECK(rocprim::partial_sort(d_temporary_storage,
                                                temporary_storage_bytes,
                                                d_keys_input,
                                                middle,
                                                size,
                                                lesser_op,
                                                stream,
                                                false));
                // Record stop event and wait until it completes
                HIP_CHECK(hipEventRecord(stop, stream));
                HIP_CHECK(hipEventSynchronize(stop));
                float elapsed_mseconds_current;
                HIP_CHECK(hipEventElapsedTime(&elapsed_mseconds_current, start, stop));
                elapsed_mseconds += elapsed_mseconds_current;
            }

            state.SetIterationTime(elapsed_mseconds / 1000);
        }

        // Destroy HIP events
        HIP_CHECK(hipEventDestroy(start));
        HIP_CHECK(hipEventDestroy(stop));

        state.SetBytesProcessed(state.iterations() * batch_size * size * sizeof(*d_keys_input));
        state.SetItemsProcessed(state.iterations() * batch_size * size);

        HIP_CHECK(hipFree(d_temporary_storage));
        HIP_CHECK(hipFree(d_keys_input));
        HIP_CHECK(hipFree(d_keys_new_data));
    }
};

#endif // ROCPRIM_BENCHMARK_DEVICE_PARTIAL_SORT_PARALLEL_HPP_
