// MIT License
//
// Copyright (c) 2017-2026 Advanced Micro Devices, Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#pragma once

#include "primbench.hpp"

#include "benchmark_utils.hpp"

#include "../common/utils_data_generation.hpp"

#include <hip/hip_runtime.h>

#include <rocprim/device/device_merge_sort.hpp>

#include <cstddef>
#include <numeric>
#include <string>
#include <type_traits>
#include <vector>

template<typename Key    = int,
         typename Value  = rocprim::empty_type,
         typename Config = rocprim::default_config>
struct device_merge_sort_benchmark : public primbench::benchmark_interface
{
    primbench::json meta() const override
    {
        return primbench::json{}
            .add("lvl", "device")
            .add("algo", "device_merge_sort")
            .add("key_type", primbench::name<Key>())
            .add("value_type", primbench::name<Value>())
            .add("cfg", "default");
    }

    void run(primbench::state& state) override
    {
        do_run(std::forward<primbench::state>(state));
    }

private:
    template<typename val = Value>
    auto do_run(primbench::state&& state) const
    {
        const auto& stream = state.stream;
        const auto& bytes  = state.size;
        const auto& seed   = state.seed;

        using key_type   = Key;
        using value_type = Value;

        size_t items = bytes / sizeof(key_type);

        // Generate data
        std::vector<key_type> keys_input
            = get_random_data<key_type>(items,
                                        common::generate_limits<key_type>::min(),
                                        common::generate_limits<key_type>::max(),
                                        seed);
        std::vector<value_type> values_input;
        value_type*             d_values_input;
        value_type*             d_values_output;

        if constexpr(!std::is_same<val, rocprim::empty_type>::value)
        {
            values_input = std::vector<value_type>(items);

            if constexpr(common::is_custom_type_copyable<value_type>::value)
            {
                for(size_t i = 0; i < items; i++)
                {
                    value_type value;
                    value.x         = static_cast<typename value_type::first_type>(i);
                    value.y         = static_cast<typename value_type::second_type>(i);
                    values_input[i] = value;
                }
            }
            else
            {
                std::iota(values_input.begin(), values_input.end(), 0);
            }

            HIP_CHECK(
                hipMalloc(reinterpret_cast<void**>(&d_values_input), items * sizeof(value_type)));
            HIP_CHECK(
                hipMalloc(reinterpret_cast<void**>(&d_values_output), items * sizeof(value_type)));
            HIP_CHECK(hipMemcpy(d_values_input,
                                values_input.data(),
                                items * sizeof(value_type),
                                hipMemcpyHostToDevice));
        }

        key_type* d_keys_input;
        key_type* d_keys_output;
        HIP_CHECK(hipMalloc(reinterpret_cast<void**>(&d_keys_input), items * sizeof(key_type)));
        HIP_CHECK(hipMalloc(reinterpret_cast<void**>(&d_keys_output), items * sizeof(key_type)));
        HIP_CHECK(hipMemcpy(d_keys_input,
                            keys_input.data(),
                            items * sizeof(key_type),
                            hipMemcpyHostToDevice));

        ::rocprim::less<key_type> lesser_op;

        void*  d_temporary_storage     = nullptr;
        size_t temporary_storage_bytes = 0;
        if constexpr(!std::is_same<val, rocprim::empty_type>::value)
        {
            HIP_CHECK(rocprim::merge_sort<Config>(d_temporary_storage,
                                                  temporary_storage_bytes,
                                                  d_keys_input,
                                                  d_keys_output,
                                                  d_values_input,
                                                  d_values_output,
                                                  items,
                                                  lesser_op,
                                                  stream,
                                                  false));
        }
        else
        {
            HIP_CHECK(rocprim::merge_sort<Config>(d_temporary_storage,
                                                  temporary_storage_bytes,
                                                  d_keys_input,
                                                  d_keys_output,
                                                  items,
                                                  lesser_op,
                                                  stream,
                                                  false));
        }

        HIP_CHECK(hipMalloc(&d_temporary_storage, temporary_storage_bytes));

        state.set_items(items);
        state.add_reads<key_type>(items);

        if constexpr(!std::is_same<val, rocprim::empty_type>::value)
        {
            state.add_reads<value_type>(items);

            state.run(
                [&]
                {
                    HIP_CHECK(rocprim::merge_sort<Config>(d_temporary_storage,
                                                          temporary_storage_bytes,
                                                          d_keys_input,
                                                          d_keys_output,
                                                          d_values_input,
                                                          d_values_output,
                                                          items,
                                                          lesser_op,
                                                          stream,
                                                          false));
                });

            HIP_CHECK(hipFree(d_values_input));
            HIP_CHECK(hipFree(d_values_output));
        }
        else
        {
            state.run(
                [&]
                {
                    HIP_CHECK(rocprim::merge_sort<Config>(d_temporary_storage,
                                                          temporary_storage_bytes,
                                                          d_keys_input,
                                                          d_keys_output,
                                                          items,
                                                          lesser_op,
                                                          stream,
                                                          false));
                });
        }

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