// MIT License
//
// Copyright (c) 2017-2021 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
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//
// The above copyright notice and this permission notice shall be included in all
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// SOFTWARE.

#include "common_test_header.hpp"

// required rocprim headers
#include <rocprim/device/device_reduce_by_key.hpp>

// required test headers
#include "test_utils_types.hpp"

template<
    class Key,
    class Value,
    class ReduceOp,
    unsigned int MinSegmentLength,
    unsigned int MaxSegmentLength,
    class Aggregate = Value,
    class KeyCompareFunction = ::rocprim::equal_to<Key>,
    // Tests output iterator with void value_type (OutputIterator concept)
    bool UseIdentityIterator = false
>
struct params
{
    using key_type = Key;
    using value_type = Value;
    using reduce_op_type = ReduceOp;
    static constexpr unsigned int min_segment_length = MinSegmentLength;
    static constexpr unsigned int max_segment_length = MaxSegmentLength;
    using aggregate_type = Aggregate;
    using key_compare_op = KeyCompareFunction;
    static constexpr bool use_identity_iterator = UseIdentityIterator;
};

template<class Params>
class RocprimDeviceReduceByKey : public ::testing::Test {
public:
    using params = Params;
};

struct custom_reduce_op1
{
    template<class T>
    ROCPRIM_HOST_DEVICE
    T operator()(T a, T b)
    {
        return a + b;
    }
};

template<class T>
struct custom_key_compare_op1
{
    ROCPRIM_HOST_DEVICE
    bool operator()(const T& a, const T& b) const
    {
        return static_cast<int>(a / 10) == static_cast<int>(b / 10);
    }
};

using custom_int2 = test_utils::custom_test_type<int>;
using custom_double2 = test_utils::custom_test_type<double>;

typedef ::testing::Types<
    params<int, int, rocprim::plus<int>, 1, 1, int, rocprim::equal_to<int>, true>,
    params<double, int, rocprim::plus<int>, 3, 5, long long, custom_key_compare_op1<double>>,
    params<float, custom_double2, rocprim::minimum<custom_double2>, 1, 10000>,
    params<custom_double2, custom_int2, rocprim::plus<custom_int2>, 1, 10>,
    params<unsigned long long, float, rocprim::minimum<float>, 1, 30>,
    params<int, rocprim::half, test_utils::half_minimum, 15, 100>,
    params<int, rocprim::bfloat16, test_utils::bfloat16_minimum, 15, 100>,
    params<int, unsigned int, rocprim::maximum<unsigned int>, 20, 100>,
    params<float, long long, rocprim::maximum<unsigned long long>, 100, 400, long long, custom_key_compare_op1<float>>,
    params<unsigned int, unsigned char, rocprim::plus<unsigned char>, 200, 600>,
    params<double, int, rocprim::plus<int>, 100, 2000, double, custom_key_compare_op1<double>>,
    params<int8_t, int8_t, rocprim::maximum<int8_t>, 20, 100>,
    params<uint8_t, uint8_t, rocprim::maximum<uint8_t>, 20, 100>,
    params<char, rocprim::half, test_utils::half_maximum, 123, 1234>,
    params<char, rocprim::bfloat16, test_utils::bfloat16_maximum, 123, 1234>,
    params<custom_int2, unsigned int, rocprim::plus<unsigned int>, 1000, 5000>,
    params<unsigned int, int, rocprim::plus<int>, 2048, 2048>,
    params<long long, short, rocprim::plus<long long>, 1000, 10000, long long>,
    params<unsigned int, double, rocprim::minimum<double>, 1000, 50000>,
    params<unsigned long long, unsigned long long, rocprim::plus<unsigned long long>, 100000, 100000>
> Params;

TYPED_TEST_SUITE(RocprimDeviceReduceByKey, Params);

std::vector<size_t> get_sizes(int seed_value)
{
    std::vector<size_t> sizes = {
        1024, 2048, 4096, 1792,
        0, 1, 10, 53, 211, 500,
        2345, 11001, 34567,
        100000,
        (1 << 16) - 1220, (1 << 23) - 76543
    };
    const std::vector<size_t> random_sizes = test_utils::get_random_data<size_t>(10, 1, 100000, seed_value);
    sizes.insert(sizes.end(), random_sizes.begin(), random_sizes.end());
    return sizes;
}

TYPED_TEST(RocprimDeviceReduceByKey, ReduceByKey)
{
    int device_id = test_common_utils::obtain_device_from_ctest();
    SCOPED_TRACE(testing::Message() << "with device_id= " << device_id);
    HIP_CHECK(hipSetDevice(device_id));

    using key_type = typename TestFixture::params::key_type;
    using value_type = typename TestFixture::params::value_type;
    using aggregate_type = typename TestFixture::params::aggregate_type;
    using reduce_op_type = typename TestFixture::params::reduce_op_type;
    using key_compare_op_type = typename TestFixture::params::key_compare_op;
    using key_inner_type = typename test_utils::inner_type<key_type>::type;
    using key_distribution_type = typename std::conditional<
        std::is_floating_point<key_inner_type>::value,
        std::uniform_real_distribution<key_inner_type>,
        typename std::conditional<
            test_utils::is_valid_for_int_distribution<key_inner_type>::value,
            std::uniform_int_distribution<key_inner_type>,
            typename std::conditional<std::is_signed<key_inner_type>::value,
                std::uniform_int_distribution<int>,
                std::uniform_int_distribution<unsigned int>
            >::type
        >::type
    >::type;

    constexpr bool use_identity_iterator = TestFixture::params::use_identity_iterator;
    const bool debug_synchronous = false;

    reduce_op_type reduce_op;
    key_compare_op_type key_compare_op;

    const unsigned int seed = 123;
    std::default_random_engine gen(seed);

    for (size_t seed_index = 0; seed_index < random_seeds_count + seed_size; seed_index++)
    {
        unsigned int seed_value = seed_index < random_seeds_count  ? rand() : seeds[seed_index - random_seeds_count];
        SCOPED_TRACE(testing::Message() << "with seed= " << seed_value);

        for(size_t size : get_sizes(seed_value))
        {
            if (size == 0 && test_common_utils::use_hmm())
            {
                // hipMallocManaged() currently doesnt support zero byte allocation
                continue;
            }

            SCOPED_TRACE(testing::Message() << "with size = " << size);

            hipStream_t stream = 0; // default

            const bool use_unique_keys = bool(test_utils::get_random_value<int>(0, 1, seed_value));

            // Generate data and calculate expected results
            std::vector<key_type> unique_expected;
            std::vector<aggregate_type> aggregates_expected;
            size_t unique_count_expected = 0;

            std::vector<key_type> keys_input(size);
            key_distribution_type key_delta_dis(1, 5);
            std::uniform_int_distribution<size_t> key_count_dis(
                TestFixture::params::min_segment_length,
                TestFixture::params::max_segment_length
            );
            std::vector<value_type> values_input = test_utils::get_random_data<value_type>(size, 0, 100, seed_value);

            size_t offset = 0;
            key_type prev_key = key_distribution_type(0, 100)(gen);
            key_type current_key = prev_key + key_delta_dis(gen);
            while(offset < size)
            {
                const size_t key_count = key_count_dis(gen);

                const size_t end = std::min(size, offset + key_count);
                for(size_t i = offset; i < end; i++)
                {
                    keys_input[i] = current_key;
                }
                aggregate_type aggregate = values_input[offset];
                for(size_t i = offset + 1; i < end; i++)
                {
                    aggregate = reduce_op(aggregate, static_cast<aggregate_type>(values_input[i]));
                }

                // The first key of the segment must be written into unique
                // (it may differ from other keys in case of custom key compraison operators)
                if(unique_count_expected == 0 || !key_compare_op(prev_key, current_key))
                {
                    unique_expected.push_back(current_key);
                    unique_count_expected++;
                    aggregates_expected.push_back(aggregate);
                }
                else
                {
                    aggregates_expected.back() = reduce_op(aggregates_expected.back(), aggregate);
                }

                if (use_unique_keys)
                {
                    prev_key = current_key;
                    // e.g. 1,1,1,2,5,5,8,8,8
                    current_key = current_key + key_delta_dis(gen);
                }
                else
                {
                    // e.g. 1,1,5,1,5,5,5,1
                    std::swap(current_key, prev_key);
                }

                offset += key_count;
            }

            key_type * d_keys_input;
            value_type * d_values_input;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input, size * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_values_input, size * sizeof(value_type)));
            HIP_CHECK(
                hipMemcpy(
                    d_keys_input, keys_input.data(),
                    size * sizeof(key_type),
                    hipMemcpyHostToDevice
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    d_values_input, values_input.data(),
                    size * sizeof(value_type),
                    hipMemcpyHostToDevice
                )
            );

            key_type * d_unique_output;
            aggregate_type * d_aggregates_output;
            unsigned int * d_unique_count_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_unique_output, unique_count_expected * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_aggregates_output, unique_count_expected * sizeof(aggregate_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_unique_count_output, sizeof(unsigned int)));

            size_t temporary_storage_bytes;

            HIP_CHECK(
                rocprim::reduce_by_key(
                    nullptr, temporary_storage_bytes,
                    d_keys_input, d_values_input, size,
                    test_utils::wrap_in_identity_iterator<use_identity_iterator>(d_unique_output),
                    test_utils::wrap_in_identity_iterator<use_identity_iterator>(d_aggregates_output),
                    d_unique_count_output,
                    reduce_op, key_compare_op,
                    stream, debug_synchronous
                )
            );

            ASSERT_GT(temporary_storage_bytes, 0);

            void * d_temporary_storage;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_temporary_storage, temporary_storage_bytes));

            HIP_CHECK(
                rocprim::reduce_by_key(
                    d_temporary_storage, temporary_storage_bytes,
                    d_keys_input, d_values_input, size,
                    d_unique_output, d_aggregates_output,
                    d_unique_count_output,
                    reduce_op, key_compare_op,
                    stream, debug_synchronous
                )
            );

            HIP_CHECK(hipFree(d_temporary_storage));

            std::vector<key_type> unique_output(unique_count_expected);
            std::vector<aggregate_type> aggregates_output(unique_count_expected);
            std::vector<unsigned int> unique_count_output(1);
            HIP_CHECK(
                hipMemcpy(
                    unique_output.data(), d_unique_output,
                    unique_count_expected * sizeof(key_type),
                    hipMemcpyDeviceToHost
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    aggregates_output.data(), d_aggregates_output,
                    unique_count_expected * sizeof(aggregate_type),
                    hipMemcpyDeviceToHost
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    unique_count_output.data(), d_unique_count_output,
                    sizeof(unsigned int),
                    hipMemcpyDeviceToHost
                )
            );

            HIP_CHECK(hipFree(d_keys_input));
            HIP_CHECK(hipFree(d_values_input));
            HIP_CHECK(hipFree(d_unique_output));
            HIP_CHECK(hipFree(d_aggregates_output));
            HIP_CHECK(hipFree(d_unique_count_output));

            ASSERT_EQ(unique_count_output[0], unique_count_expected);

            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(unique_output, unique_expected));
            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(aggregates_output, aggregates_expected));
        }
    }

}