// 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_device_ptr.hpp"
#ifndef BENCHMARK_CONFIG_TUNING
    #include "../common/utils_custom_type.hpp"
#endif

#include <hip/hip_runtime.h>

#include <rocprim/config.hpp>
#include <rocprim/device/config_types.hpp>
#include <rocprim/device/detail/device_config_helper.hpp>
#include <rocprim/device/device_scan_by_key.hpp>
#include <rocprim/functional.hpp>
#ifdef BENCHMARK_CONFIG_TUNING
    #include <rocprim/block/block_load.hpp>
    #include <rocprim/block/block_scan.hpp>
    #include <rocprim/block/block_store.hpp>
#else
    #include <rocprim/functional.hpp>
    #include <rocprim/types.hpp>
#endif

#include <cstddef>
#include <string>
#include <type_traits>
#include <vector>
#ifdef BENCHMARK_CONFIG_TUNING
    #include <memory>
#else
    #include <stdint.h>
#endif

inline const char* get_block_scan_algorithm_name(rocprim::block_scan_algorithm alg)
{
    switch(alg)
    {
        case rocprim::block_scan_algorithm::using_warp_scan:
            return "block_scan_algorithm::using_warp_scan";
        case rocprim::block_scan_algorithm::reduce_then_scan:
            return "block_scan_algorithm::reduce_then_scan";
            // Not using `default: ...` because it kills effectiveness of -Wswitch
    }
    return "default_algorithm";
}

template<typename Config>
constexpr auto config_name()
{
    if constexpr(std::is_same_v<Config, rocprim::default_config>)
    {
        return std::string("default");
    }
    else
    {
        auto config = Config();
        return primbench::json{}
            .add("bs", config.kernel_config.block_size)
            .add("ipt", config.kernel_config.items_per_thread)
            .add("method", get_block_scan_algorithm_name(config.block_scan_method));
    }
}

template<bool Exclusive,
         typename Key,
         typename Value,
         typename ScanOp,
         typename CompareOp,
         unsigned int MaxSegmentLength,
         bool         Deterministic,
         typename Config = rocprim::default_config>
struct device_scan_by_key_benchmark : public primbench::benchmark_interface
{
    primbench::json meta() const override
    {
        auto algo = []
        {
            if constexpr(Deterministic)
            {
                return "device_scan_by_key_deterministic";
            }
            else
            {
                return "device_scan_by_key";
            }
        };

        return primbench::json{}
            .add("lvl", "device")
            .add("algo", algo())
            .add("exclusive", Exclusive)
            .add("key_type", primbench::name<Key>())
            .add("value_type", primbench::name<Value>())
            .add("max_segment_length", MaxSegmentLength)
            .add("cfg", config_name<Config>());
    }

    template<bool excl = Exclusive>
    auto run_device_scan_by_key(void*             temporary_storage,
                                size_t&           storage_size,
                                const Key*        keys,
                                const Value*      input,
                                Value*            output,
                                const Value       initial_value,
                                const size_t      input_size,
                                const ScanOp      scan_op,
                                const CompareOp   compare_op,
                                const hipStream_t stream,
                                const bool        debug = false) const
    {
        if constexpr(excl)
        {
            if constexpr(!Deterministic)
            {
                return rocprim::exclusive_scan_by_key<Config>(temporary_storage,
                                                              storage_size,
                                                              keys,
                                                              input,
                                                              output,
                                                              initial_value,
                                                              input_size,
                                                              scan_op,
                                                              compare_op,
                                                              stream,
                                                              debug);
            }
            else
            {
                return rocprim::deterministic_exclusive_scan_by_key<Config>(temporary_storage,
                                                                            storage_size,
                                                                            keys,
                                                                            input,
                                                                            output,
                                                                            initial_value,
                                                                            input_size,
                                                                            scan_op,
                                                                            compare_op,
                                                                            stream,
                                                                            debug);
            }
        }
        else
        {
            if constexpr(!Deterministic)
            {
                return rocprim::inclusive_scan_by_key<Config>(temporary_storage,
                                                              storage_size,
                                                              keys,
                                                              input,
                                                              output,
                                                              input_size,
                                                              scan_op,
                                                              compare_op,
                                                              stream,
                                                              debug);
            }
            else
            {
                return rocprim::deterministic_inclusive_scan_by_key<Config>(temporary_storage,
                                                                            storage_size,
                                                                            keys,
                                                                            input,
                                                                            output,
                                                                            input_size,
                                                                            scan_op,
                                                                            compare_op,
                                                                            stream,
                                                                            debug);
            }
        }
    }

    void run(primbench::state& state) override
    {
        const auto& stream = state.stream;
        const auto& bytes  = state.size;
        const auto& seed   = state.seed;

        auto seeds = primbench::seeds<2>(seed);

        size_t items = bytes / sizeof(Value);

        constexpr bool debug = false;

        const std::vector<Key> keys = get_random_segments<Key>(items, MaxSegmentLength, seeds[0]);

        const auto random_range = limit_random_range<Value>(0, 1000);

        const std::vector<Value> input
            = get_random_data<Value>(items, random_range.first, random_range.second, seeds[1]);

        ScanOp    scan_op{};
        CompareOp compare_op{};

        Value                     initial_value = Value(123);
        common::device_ptr<Value> d_input(input);
        common::device_ptr<Key>   d_keys(keys);
        common::device_ptr<Value> d_output(input.size());

        // Allocate temporary storage memory
        size_t temp_storage_size_bytes;

        // Get size of d_temp_storage
        HIP_CHECK((run_device_scan_by_key(nullptr,
                                          temp_storage_size_bytes,
                                          d_keys.get(),
                                          d_input.get(),
                                          d_output.get(),
                                          initial_value,
                                          items,
                                          scan_op,
                                          compare_op,
                                          stream,
                                          debug)));
        common::device_ptr<void> d_temp_storage(temp_storage_size_bytes);

        state.set_items(items);
        state.add_reads<Key>(items);
        state.add_reads<Value>(items);

        state.run(
            [&]
            {
                HIP_CHECK((run_device_scan_by_key(d_temp_storage.get(),
                                                  temp_storage_size_bytes,
                                                  d_keys.get(),
                                                  d_input.get(),
                                                  d_output.get(),
                                                  initial_value,
                                                  items,
                                                  scan_op,
                                                  compare_op,
                                                  stream,
                                                  debug)));
            });
    }
};

#ifdef BENCHMARK_CONFIG_TUNING

template<typename KeyType, typename ValueType, rocprim::block_scan_algorithm BlockScanAlgorithm>
struct device_scan_by_key_benchmark_generator
{
    template<typename index_range>
    struct create_block_scan_algorithm
    {
        template<unsigned int BlockSizeExponent>
        struct create_block_size
        {
            template<unsigned int ItemsPerThread>
            struct create_ipt
            {
                void operator()(
                    std::vector<std::unique_ptr<primbench::benchmark_interface>>& storage)
                {
                    storage.emplace_back(std::make_unique<device_scan_by_key_benchmark<
                                             false,
                                             KeyType,
                                             ValueType,
                                             rocprim::plus<ValueType>,
                                             rocprim::equal_to<KeyType>,
                                             1024,
                                             false,
                                             rocprim::scan_by_key_config<
                                                 block_size,
                                                 ItemsPerThread,
                                                 rocprim::block_load_method::block_load_transpose,
                                                 rocprim::block_store_method::block_store_transpose,
                                                 BlockScanAlgorithm>>>());
                }
            };

            void operator()(std::vector<std::unique_ptr<primbench::benchmark_interface>>& storage)
            {
                // Limit items per thread to not over-use shared memory
                static constexpr unsigned int max_items_per_thread = ::rocprim::min<size_t>(
                    65536
                        / (block_size
                           * (sizeof(KeyType) + sizeof(ValueType)
                              + (sizeof(KeyType) == 16 && sizeof(ValueType) == 1))),
                    24);
                static_for_each<make_index_range<unsigned int, 1, max_items_per_thread>,
                                create_ipt>(storage);
            }

            static constexpr unsigned int block_size = 1u << BlockSizeExponent;
        };

        static void create(std::vector<std::unique_ptr<primbench::benchmark_interface>>& storage)
        {
            static_for_each<index_range, create_block_size>(storage);
        }
    };

    static void create(std::vector<std::unique_ptr<primbench::benchmark_interface>>& storage)
    {
        // Block sizes 64, 128, 256
        create_block_scan_algorithm<make_index_range<unsigned int, 6, 8>>::create(storage);
    }
};

#else // BENCHMARK_CONFIG_TUNING

    #define CREATE_BY_KEY_BENCHMARK(EXCL, T, SCAN_OP, MAX_SEGMENT_LENGTH)   \
        executor.queue<device_scan_by_key_benchmark<EXCL,                   \
                                                    int,                    \
                                                    T,                      \
                                                    SCAN_OP,                \
                                                    rocprim::equal_to<int>, \
                                                    MAX_SEGMENT_LENGTH,     \
                                                    Deterministic>>();

    #define CREATE_EXCL_INCL_BENCHMARK(EXCL, T, SCAN_OP) \
        CREATE_BY_KEY_BENCHMARK(EXCL, T, SCAN_OP, 1)     \
        CREATE_BY_KEY_BENCHMARK(EXCL, T, SCAN_OP, 16)    \
        CREATE_BY_KEY_BENCHMARK(EXCL, T, SCAN_OP, 256)   \
        CREATE_BY_KEY_BENCHMARK(EXCL, T, SCAN_OP, 4096)  \
        CREATE_BY_KEY_BENCHMARK(EXCL, T, SCAN_OP, 65536)

    #define CREATE_BENCHMARK(T)                                \
        CREATE_EXCL_INCL_BENCHMARK(false, T, rocprim::plus<T>) \
        CREATE_EXCL_INCL_BENCHMARK(true, T, rocprim::plus<T>)

    #define BENCHMARK_TYPE_TUNING(KEY_TYPE, VALUE_TYPE)                          \
        executor.queue<device_scan_by_key_benchmark<false,                       \
                                                    KEY_TYPE,                    \
                                                    VALUE_TYPE,                  \
                                                    rocprim::plus<VALUE_TYPE>,   \
                                                    rocprim::equal_to<KEY_TYPE>, \
                                                    1024,                        \
                                                    false>>();

    // All of the limited tuned types
    #define BENCHMARK_TYPES_TUNING(KEY_TYPE)               \
        BENCHMARK_TYPE_TUNING(KEY_TYPE, rocprim::int128_t) \
        BENCHMARK_TYPE_TUNING(KEY_TYPE, int64_t)           \
        BENCHMARK_TYPE_TUNING(KEY_TYPE, int)               \
        BENCHMARK_TYPE_TUNING(KEY_TYPE, short)             \
        BENCHMARK_TYPE_TUNING(KEY_TYPE, int8_t)

template<bool Deterministic>
void add_benchmarks(primbench::executor& executor)
{
    if constexpr(!Deterministic)
    {
        // Tuned types
        BENCHMARK_TYPES_TUNING(rocprim::int128_t)
        BENCHMARK_TYPES_TUNING(int64_t)
        BENCHMARK_TYPES_TUNING(int)
        BENCHMARK_TYPES_TUNING(short)
        BENCHMARK_TYPES_TUNING(int8_t)
        BENCHMARK_TYPES_TUNING(double)
        BENCHMARK_TYPES_TUNING(float)
        BENCHMARK_TYPES_TUNING(rocprim::half)
    }

    #ifndef BENCHMARK_AUTOTUNED_TYPES_ONLY
    // Not tuned types
    CREATE_BENCHMARK(float)
    CREATE_BENCHMARK(double)
    CREATE_BENCHMARK(float2)
    CREATE_BENCHMARK(double2)
    CREATE_BENCHMARK(uint8_t)
    CREATE_BENCHMARK(rocprim::half)
    CREATE_BENCHMARK(rocprim::uint128_t)

    // Not tuned custom types
    using custom_f32_f32 = common::custom_type<float, float>;
    using custom_f64_f64 = common::custom_type<double, double>;

    CREATE_BENCHMARK(custom_f32_f32)
    CREATE_BENCHMARK(custom_f64_f64)
    #endif
}

#endif // BENCHMARK_CONFIG_TUNING