// MIT License
//
// Copyright (c) 2017-2022 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.

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

// required rocprim headers
#include <rocprim/device/device_merge.hpp>
#include <rocprim/functional.hpp>
#include <rocprim/iterator/counting_iterator.hpp>
#include <rocprim/iterator/transform_iterator.hpp>

#include <gtest/gtest.h>

#include <hip/hip_runtime.h>

#include <algorithm>
#include <numeric>
#include <vector>

// Params for tests
template<
    class KeyType,
    class ValueType,
    class CompareOp = ::rocprim::less<KeyType>
>
struct DeviceMergeParams
{
    using key_type = KeyType;
    using value_type = ValueType;
    using compare_op_type = CompareOp;
};

template<class Params>
class RocprimDeviceMergeTests : public ::testing::Test
{
public:
    using key_type = typename Params::key_type;
    using value_type = typename Params::value_type;
    using compare_op_type = typename Params::compare_op_type;
    const bool debug_synchronous = false;
};

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

typedef ::testing::Types<
    DeviceMergeParams<int, double>,
    DeviceMergeParams<unsigned long, unsigned int, rocprim::greater<unsigned long>>,
    DeviceMergeParams<float, custom_double2>,
    DeviceMergeParams<int, float>,
    DeviceMergeParams<int8_t, int8_t>,
    DeviceMergeParams<uint8_t, uint8_t>,
    DeviceMergeParams<rocprim::half, rocprim::half, rocprim::less<rocprim::half>>,
    DeviceMergeParams<rocprim::bfloat16, rocprim::bfloat16, rocprim::less<rocprim::bfloat16>>,
    DeviceMergeParams<custom_double2, custom_int2, rocprim::greater<custom_double2>>,
    DeviceMergeParams<custom_int2, char>>
    RocprimDeviceMergeTestsParams;

// size1, size2
std::vector<std::tuple<size_t, size_t>> get_sizes()
{
    std::vector<std::tuple<size_t, size_t>> sizes = {
        std::make_tuple(0, 0),
        std::make_tuple(2, 1),
        std::make_tuple(10, 10),
        std::make_tuple(111, 111),
        std::make_tuple(128, 1289),
        std::make_tuple(12, 1000),
        std::make_tuple(123, 3000),
        std::make_tuple(1024, 512),
        std::make_tuple(2345, 49),
        std::make_tuple(17867, 41),
        std::make_tuple(17867, 34567),
        std::make_tuple(34567, (1 << 17) - 1220),
        std::make_tuple(924353, 1723454),
    };
    return sizes;
}

TYPED_TEST_SUITE(RocprimDeviceMergeTests, RocprimDeviceMergeTestsParams);

TYPED_TEST(RocprimDeviceMergeTests, MergeKey)
{
    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::key_type;
    using compare_op_type = typename TestFixture::compare_op_type;
    const bool debug_synchronous = TestFixture::debug_synchronous;

    hipStream_t stream = 0; // default

    for(auto sizes : get_sizes())
    {
        if ((std::get<0>(sizes) == 0 || std::get<1>(sizes) == 0) && test_common_utils::use_hmm())
        {
            // hipMallocManaged() currently doesnt support zero byte allocation
            continue;
        }
        SCOPED_TRACE(
            testing::Message() << "with sizes = {" <<
            std::get<0>(sizes) << ", " << std::get<1>(sizes) << "}"
        );

        const size_t size1 = std::get<0>(sizes);
        const size_t size2 = std::get<1>(sizes);

        // compare function
        compare_op_type compare_op;

        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);

            // Generate data
            std::vector<key_type> keys_input1 = test_utils::get_random_data<key_type>(size1, 0, size1, seed_value);
            std::vector<key_type> keys_input2 = test_utils::get_random_data<key_type>(size2, 0, size2, seed_value);
            std::sort(keys_input1.begin(), keys_input1.end(), compare_op);
            std::sort(keys_input2.begin(), keys_input2.end(), compare_op);
            std::vector<key_type> keys_output(size1 + size2, (key_type)0);

            // Calculate expected results on host
            std::vector<key_type> expected(keys_output.size());
            std::merge(
                keys_input1.begin(),
                keys_input1.end(),
                keys_input2.begin(),
                keys_input2.end(),
                expected.begin(),
                compare_op
            );

            test_utils::out_of_bounds_flag out_of_bounds;

            key_type * d_keys_input1;
            key_type * d_keys_input2;
            key_type * d_keys_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input1, keys_input1.size() * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input2, keys_input2.size() * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_output, keys_output.size() * sizeof(key_type)));
            HIP_CHECK(
                hipMemcpy(
                    d_keys_input1, keys_input1.data(),
                    keys_input1.size() * sizeof(key_type),
                    hipMemcpyHostToDevice
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    d_keys_input2, keys_input2.data(),
                    keys_input2.size() * sizeof(key_type),
                    hipMemcpyHostToDevice
                )
            );

            test_utils::bounds_checking_iterator<key_type> d_keys_checking_output(
                d_keys_output,
                out_of_bounds.device_pointer(),
                size1 + size2
            );

            // temp storage
            size_t temp_storage_size_bytes;
            void * d_temp_storage = nullptr;
            // Get size of d_temp_storage
            HIP_CHECK(
                rocprim::merge(
                    d_temp_storage, temp_storage_size_bytes,
                    d_keys_input1, d_keys_input2,
                    d_keys_checking_output,
                    keys_input1.size(), keys_input2.size(),
                    compare_op, stream, debug_synchronous
                )
            );

            // temp_storage_size_bytes must be >0
            ASSERT_GT(temp_storage_size_bytes, 0);

            // allocate temporary storage
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_temp_storage, temp_storage_size_bytes));

            // Run
            HIP_CHECK(
                rocprim::merge(
                    d_temp_storage, temp_storage_size_bytes,
                    d_keys_input1, d_keys_input2,
                    d_keys_checking_output,
                    keys_input1.size(), keys_input2.size(),
                    compare_op, stream, debug_synchronous
                )
            );
            HIP_CHECK(hipGetLastError());
            HIP_CHECK(hipDeviceSynchronize());

            ASSERT_FALSE(out_of_bounds.get());

            // Copy keys_output to host
            HIP_CHECK(
                hipMemcpy(
                    keys_output.data(), d_keys_output,
                    keys_output.size() * sizeof(key_type),
                    hipMemcpyDeviceToHost
                )
            );

            // Check if keys_output values are as expected
            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(keys_output, expected));

            hipFree(d_keys_input1);
            hipFree(d_keys_input2);
            hipFree(d_keys_output);
            hipFree(d_temp_storage);
        }


    }
}

TYPED_TEST(RocprimDeviceMergeTests, MergeKeyValue)
{
    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::key_type;
    using value_type = typename TestFixture::value_type;
    using compare_op_type = typename TestFixture::compare_op_type;
    const bool debug_synchronous = TestFixture::debug_synchronous;

    using key_value = std::pair<key_type, value_type>;

    hipStream_t stream = 0; // default

    for(auto sizes : get_sizes())
    {
        if ((std::get<0>(sizes) == 0 || std::get<1>(sizes) == 0) && test_common_utils::use_hmm())
        {
            // hipMallocManaged() currently doesnt support zero byte allocation
            continue;
        }
        SCOPED_TRACE(
            testing::Message() << "with sizes = {" <<
            std::get<0>(sizes) << ", " << std::get<1>(sizes) << "}"
        );

        const size_t size1 = std::get<0>(sizes);
        const size_t size2 = std::get<1>(sizes);

        // compare function
        compare_op_type compare_op;

        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);

            // Generate data
            std::vector<key_type> keys_input1 = test_utils::get_random_data<key_type>(size1, 0, size1, seed_value);
            std::vector<key_type> keys_input2 = test_utils::get_random_data<key_type>(size2, 0, size2, seed_value);
            std::sort(keys_input1.begin(), keys_input1.end(), compare_op);
            std::sort(keys_input2.begin(), keys_input2.end(), compare_op);
            std::vector<value_type> values_input1(size1);
            std::vector<value_type> values_input2(size2);
            test_utils::iota(values_input1.begin(), values_input1.end(), 0);
            test_utils::iota(values_input2.begin(), values_input2.end(), size1);
            std::vector<key_type> keys_output(size1 + size2, (key_type)0);
            std::vector<value_type> values_output(size1 + size2, (value_type)0);

            // Calculate expected results on host
            std::vector<key_value> vector1(size1);
            std::vector<key_value> vector2(size2);

            for(size_t i = 0; i < size1; i++)
            {
                vector1[i] = key_value(keys_input1[i], values_input1[i]);
            }
            for(size_t i = 0; i < size2; i++)
            {
                vector2[i] = key_value(keys_input2[i], values_input2[i]);
            }

            std::vector<key_value> expected(size1 + size2);
            std::merge(
                vector1.begin(),
                vector1.end(),
                vector2.begin(),
                vector2.end(),
                expected.begin(),
                [compare_op](const key_value& a, const key_value& b) { return compare_op(a.first, b.first); }
            );

            test_utils::out_of_bounds_flag out_of_bounds;

            key_type * d_keys_input1;
            key_type * d_keys_input2;
            key_type * d_keys_output;
            value_type * d_values_input1;
            value_type * d_values_input2;
            value_type * d_values_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input1, keys_input1.size() * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input2, keys_input2.size() * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_output, keys_output.size() * sizeof(key_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_values_input1, values_input1.size() * sizeof(value_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_values_input2, values_input2.size() * sizeof(value_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_values_output, values_output.size() * sizeof(value_type)));
            HIP_CHECK(
                hipMemcpy(
                    d_keys_input1, keys_input1.data(),
                    keys_input1.size() * sizeof(key_type),
                    hipMemcpyHostToDevice
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    d_keys_input2, keys_input2.data(),
                    keys_input2.size() * sizeof(key_type),
                    hipMemcpyHostToDevice
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    d_values_input1, values_input1.data(),
                    values_input1.size() * sizeof(value_type),
                    hipMemcpyHostToDevice
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    d_values_input2, values_input2.data(),
                    values_input2.size() * sizeof(value_type),
                    hipMemcpyHostToDevice
                )
            );

            test_utils::bounds_checking_iterator<key_type> d_keys_checking_output(
                d_keys_output,
                out_of_bounds.device_pointer(),
                size1 + size2
            );
            test_utils::bounds_checking_iterator<value_type> d_values_checking_output(
                d_values_output,
                out_of_bounds.device_pointer(),
                size1 + size2
            );

            // temp storage
            size_t temp_storage_size_bytes;
            void * d_temp_storage = nullptr;
            // Get size of d_temp_storage
            HIP_CHECK(
                rocprim::merge(
                    d_temp_storage, temp_storage_size_bytes,
                    d_keys_input1, d_keys_input2,
                    d_keys_checking_output,
                    d_values_input1, d_values_input2,
                    d_values_checking_output,
                    keys_input1.size(), keys_input2.size(),
                    compare_op, stream, debug_synchronous
                )
            );

            // temp_storage_size_bytes must be >0
            ASSERT_GT(temp_storage_size_bytes, 0);

            // allocate temporary storage
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_temp_storage, temp_storage_size_bytes));

            // Run
            HIP_CHECK(
                rocprim::merge(
                    d_temp_storage, temp_storage_size_bytes,
                    d_keys_input1, d_keys_input2,
                    d_keys_checking_output,
                    d_values_input1, d_values_input2,
                    d_values_checking_output,
                    keys_input1.size(), keys_input2.size(),
                    compare_op, stream, debug_synchronous
                )
            );
            HIP_CHECK(hipGetLastError());
            HIP_CHECK(hipDeviceSynchronize());

            ASSERT_FALSE(out_of_bounds.get());

            HIP_CHECK(
                hipMemcpy(
                    keys_output.data(), d_keys_output,
                    keys_output.size() * sizeof(key_type),
                    hipMemcpyDeviceToHost
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    values_output.data(), d_values_output,
                    values_output.size() * sizeof(value_type),
                    hipMemcpyDeviceToHost
                )
            );

            // Check if keys_output values are as expected
            std::vector<key_type> expected_key(expected.size());
            std::vector<value_type> expected_value(expected.size());
            for(size_t i = 0; i < expected.size(); i++)
            {
                expected_key[i] = expected[i].first;
                expected_value[i] = expected[i].second;
            }
            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(keys_output, expected_key));
            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(values_output, expected_value));

            hipFree(d_keys_input1);
            hipFree(d_keys_input2);
            hipFree(d_keys_output);
            hipFree(d_values_input1);
            hipFree(d_values_input2);
            hipFree(d_values_output);
            hipFree(d_temp_storage);
        }

    }
}

TEST(RocprimDeviceMergeTests, MergeMismatchedIteratorTypes)
{
    const int device_id = test_common_utils::obtain_device_from_ctest();
    SCOPED_TRACE(testing::Message() << "with device_id = " << device_id);
    HIP_CHECK(hipSetDevice(device_id));

    std::vector<int> keys_input1(1'024);
    std::generate(keys_input1.begin(),
                  keys_input1.end(),
                  [n = 0]() mutable
                  {
                      const int temp = n;
                      n += 2;
                      return temp;
                  });

    std::vector<int> expected_keys_output(2 * keys_input1.size());
    std::iota(expected_keys_output.begin(), expected_keys_output.end(), 0);

    int* d_keys_input1 = nullptr;
    int* d_keys_output = nullptr;
    HIP_CHECK(test_common_utils::hipMallocHelper(&d_keys_input1,
                                                 keys_input1.size() * sizeof(keys_input1[0])));
    HIP_CHECK(
        test_common_utils::hipMallocHelper(&d_keys_output,
                                           expected_keys_output.size() * sizeof(keys_input1[0])));

    HIP_CHECK(hipMemcpy(d_keys_input1,
                        keys_input1.data(),
                        keys_input1.size() * sizeof(keys_input1[0]),
                        hipMemcpyHostToDevice));

    const auto d_keys_input2 = rocprim::make_transform_iterator(rocprim::make_counting_iterator(0),
                                                                [] __host__ __device__(int value)
                                                                { return value * 2 + 1; });

    static constexpr bool debug_synchronous = false;

    size_t temp_storage_size_bytes = 0;
    HIP_CHECK(rocprim::merge(nullptr,
                             temp_storage_size_bytes,
                             d_keys_input1,
                             d_keys_input2,
                             d_keys_output,
                             keys_input1.size(),
                             keys_input1.size(),
                             rocprim::less<int>{},
                             hipStreamDefault,
                             debug_synchronous));

    ASSERT_GT(temp_storage_size_bytes, 0);

    void* d_temp_storage = nullptr;
    HIP_CHECK(test_common_utils::hipMallocHelper(&d_temp_storage, temp_storage_size_bytes));

    HIP_CHECK(rocprim::merge(d_temp_storage,
                             temp_storage_size_bytes,
                             d_keys_input1,
                             d_keys_input2,
                             d_keys_output,
                             keys_input1.size(),
                             keys_input1.size(),
                             rocprim::less<int>{},
                             hipStreamDefault,
                             debug_synchronous));

    std::vector<int> keys_output(expected_keys_output.size());
    HIP_CHECK(hipMemcpy(keys_output.data(),
                        d_keys_output,
                        keys_output.size() * sizeof(keys_output[0]),
                        hipMemcpyDeviceToHost));

    ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(keys_output, expected_keys_output));

    HIP_CHECK(hipFree(d_temp_storage));
    HIP_CHECK(hipFree(d_keys_output));
    HIP_CHECK(hipFree(d_keys_input1));
}
