// MIT License
//
// Copyright (c) 2019-2021 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
// 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.

#include "common_test_header.hpp"

// required rocprim headers
#include <rocprim/functional.hpp>
#include <rocprim/device/device_binary_search.hpp>

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

template<
    class Haystack,
    class Needle,
    class Output = size_t,
    class CompareFunction = rocprim::less<>
>
struct params
{
    using haystack_type = Haystack;
    using needle_type = Needle;
    using output_type = Output;
    using compare_op_type = CompareFunction;
};

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

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

typedef ::testing::Types<
    params<int, int>,
    params<unsigned long long, unsigned long long, size_t, rocprim::greater<unsigned long long> >,
    params<float, double, unsigned int, rocprim::greater<double> >,
    params<double, int>,
    params<int8_t, int8_t>,
    params<uint8_t, uint8_t>,
    params<rocprim::half, rocprim::half, size_t, test_utils::half_less>,
    params<rocprim::bfloat16, rocprim::bfloat16, size_t, test_utils::bfloat16_less>,
    params<custom_int2, custom_int2>,
    params<custom_double2, custom_double2, unsigned int, rocprim::greater<custom_double2> >
> Params;

TYPED_TEST_SUITE(RocprimDeviceBinarySearch, Params);

std::vector<size_t> get_sizes(int seed_value)
{
    std::vector<size_t> sizes = { 0, 1, 10, 53, 211, 1024, 2345, 4096, 34567, (1 << 16) - 1220, (1 << 22) - 76543 };
    const std::vector<size_t> random_sizes = test_utils::get_random_data<size_t>(5, 1, 100000, seed_value);
    sizes.insert(sizes.end(), random_sizes.begin(), random_sizes.end());
    return sizes;
}

TYPED_TEST(RocprimDeviceBinarySearch, LowerBound)
{
    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 haystack_type = typename TestFixture::params::haystack_type;
    using needle_type = typename TestFixture::params::needle_type;
    using output_type = typename TestFixture::params::output_type;
    using compare_op_type = typename TestFixture::params::compare_op_type;

    hipStream_t stream = 0;

    const bool debug_synchronous = false;

    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);

        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);

            const size_t haystack_size = size;
            const size_t needles_size = (size_t)std::sqrt(size); // cast promises no data loss, silences warning
            const size_t d = haystack_size / 100;

            // Generate data
            std::vector<haystack_type> haystack = test_utils::get_random_data<haystack_type>(
                haystack_size, 0, haystack_size + 2 * d, seed_value
            );
            std::sort(haystack.begin(), haystack.end(), compare_op);

            // Use a narrower range for needles for checking out-of-haystack cases
            std::vector<needle_type> needles = test_utils::get_random_data<needle_type>(
                needles_size, d, haystack_size + d, seed_value
            );

            haystack_type * d_haystack;
            needle_type * d_needles;
            output_type * d_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_haystack, haystack_size * sizeof(haystack_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_needles, needles_size * sizeof(needle_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_output, needles_size * sizeof(output_type)));
            HIP_CHECK(
                hipMemcpy(
                    d_haystack, haystack.data(),
                    haystack_size * sizeof(haystack_type),
                    hipMemcpyHostToDevice
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    d_needles, needles.data(),
                    needles_size * sizeof(needle_type),
                    hipMemcpyHostToDevice
                )
            );

            // Calculate expected results on host
            std::vector<output_type> expected(needles_size);
            for(size_t i = 0; i < needles_size; i++)
            {
                expected[i] =
                    std::lower_bound(haystack.begin(), haystack.end(), needles[i], compare_op) -
                    haystack.begin();
            }

            void * d_temporary_storage = nullptr;
            size_t temporary_storage_bytes;
            HIP_CHECK(
                rocprim::lower_bound(
                    d_temporary_storage, temporary_storage_bytes,
                    d_haystack, d_needles, d_output,
                    haystack_size, needles_size,
                    compare_op,
                    stream, debug_synchronous
                )
            );

            ASSERT_GT(temporary_storage_bytes, 0);

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

            HIP_CHECK(
                rocprim::lower_bound(
                    d_temporary_storage, temporary_storage_bytes,
                    d_haystack, d_needles, d_output,
                    haystack_size, needles_size,
                    compare_op,
                    stream, debug_synchronous
                )
            );

            std::vector<output_type> output(needles_size);
            HIP_CHECK(
                hipMemcpy(
                    output.data(), d_output,
                    needles_size * sizeof(output_type),
                    hipMemcpyDeviceToHost
                )
            );

            HIP_CHECK(hipFree(d_temporary_storage));
            HIP_CHECK(hipFree(d_haystack));
            HIP_CHECK(hipFree(d_needles));
            HIP_CHECK(hipFree(d_output));

            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(output, expected));
        }
    }


}

TYPED_TEST(RocprimDeviceBinarySearch, UpperBound)
{
    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 haystack_type = typename TestFixture::params::haystack_type;
    using needle_type = typename TestFixture::params::needle_type;
    using output_type = typename TestFixture::params::output_type;
    using compare_op_type = typename TestFixture::params::compare_op_type;

    hipStream_t stream = 0;

    const bool debug_synchronous = false;

    compare_op_type compare_op;

    for (size_t seed_index = 0; seed_index < random_seeds_count + seed_size; seed_index++)
    {
        seed_type 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);
            const size_t haystack_size = size;
            const size_t needles_size = (size_t)std::sqrt(size); // cast promises no data loss, silences warning
            const size_t d = haystack_size / 100;

            // Generate data
            std::vector<haystack_type> haystack = test_utils::get_random_data<haystack_type>(
                haystack_size, 0, haystack_size + 2 * d, seed_value
            );
            std::sort(haystack.begin(), haystack.end(), compare_op);

            // Use a narrower range for needles for checking out-of-haystack cases
            std::vector<needle_type> needles = test_utils::get_random_data<needle_type>(
                needles_size, d, haystack_size + d, seed_value
            );

            haystack_type * d_haystack;
            needle_type * d_needles;
            output_type * d_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_haystack, haystack_size * sizeof(haystack_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_needles, needles_size * sizeof(needle_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_output, needles_size * sizeof(output_type)));
            HIP_CHECK(
                hipMemcpy(
                    d_haystack, haystack.data(),
                    haystack_size * sizeof(haystack_type),
                    hipMemcpyHostToDevice
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    d_needles, needles.data(),
                    needles_size * sizeof(needle_type),
                    hipMemcpyHostToDevice
                )
            );

            // Calculate expected results on host
            std::vector<output_type> expected(needles_size);
            for(size_t i = 0; i < needles_size; i++)
            {
                expected[i] =
                    std::upper_bound(haystack.begin(), haystack.end(), needles[i], compare_op) -
                    haystack.begin();
            }

            void * d_temporary_storage = nullptr;
            size_t temporary_storage_bytes;
            HIP_CHECK(
                rocprim::upper_bound(
                    d_temporary_storage, temporary_storage_bytes,
                    d_haystack, d_needles, d_output,
                    haystack_size, needles_size,
                    compare_op,
                    stream, debug_synchronous
                )
            );

            ASSERT_GT(temporary_storage_bytes, 0);

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

            HIP_CHECK(
                rocprim::upper_bound(
                    d_temporary_storage, temporary_storage_bytes,
                    d_haystack, d_needles, d_output,
                    haystack_size, needles_size,
                    compare_op,
                    stream, debug_synchronous
                )
            );

            std::vector<output_type> output(needles_size);
            HIP_CHECK(
                hipMemcpy(
                    output.data(), d_output,
                    needles_size * sizeof(output_type),
                    hipMemcpyDeviceToHost
                )
            );

            HIP_CHECK(hipFree(d_temporary_storage));
            HIP_CHECK(hipFree(d_haystack));
            HIP_CHECK(hipFree(d_needles));
            HIP_CHECK(hipFree(d_output));

            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(output, expected));
        }
    }


}

TYPED_TEST(RocprimDeviceBinarySearch, BinarySearch)
{
    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 haystack_type = typename TestFixture::params::haystack_type;
    using needle_type = typename TestFixture::params::needle_type;
    using output_type = typename TestFixture::params::output_type;
    using compare_op_type = typename TestFixture::params::compare_op_type;

    hipStream_t stream = 0;

    const bool debug_synchronous = false;

    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);

        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);

            const size_t haystack_size = size;
            const size_t needles_size = (size_t)std::sqrt(size); // cast promises no data loss, silences warning
            const size_t d = haystack_size / 100;

            // Generate data
            std::vector<haystack_type> haystack = test_utils::get_random_data<haystack_type>(
                haystack_size, 0, haystack_size + 2 * d, seed_value
            );
            std::sort(haystack.begin(), haystack.end(), compare_op);

            // Use a narrower range for needles for checking out-of-haystack cases
            std::vector<needle_type> needles = test_utils::get_random_data<needle_type>(
                needles_size, d, haystack_size + d, seed_value
            );

            haystack_type * d_haystack;
            needle_type * d_needles;
            output_type * d_output;
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_haystack, haystack_size * sizeof(haystack_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_needles, needles_size * sizeof(needle_type)));
            HIP_CHECK(test_common_utils::hipMallocHelper(&d_output, needles_size * sizeof(output_type)));
            HIP_CHECK(
                hipMemcpy(
                    d_haystack, haystack.data(),
                    haystack_size * sizeof(haystack_type),
                    hipMemcpyHostToDevice
                )
            );
            HIP_CHECK(
                hipMemcpy(
                    d_needles, needles.data(),
                    needles_size * sizeof(needle_type),
                    hipMemcpyHostToDevice
                )
            );

            // Calculate expected results on host
            std::vector<output_type> expected(needles_size);
            for(size_t i = 0; i < needles_size; i++)
            {
                expected[i] = std::binary_search(haystack.begin(), haystack.end(), needles[i], compare_op);
            }

            void * d_temporary_storage = nullptr;
            size_t temporary_storage_bytes;
            HIP_CHECK(
                rocprim::binary_search(
                    d_temporary_storage, temporary_storage_bytes,
                    d_haystack, d_needles, d_output,
                    haystack_size, needles_size,
                    compare_op,
                    stream, debug_synchronous
                )
            );

            ASSERT_GT(temporary_storage_bytes, 0);

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

            HIP_CHECK(
                rocprim::binary_search(
                    d_temporary_storage, temporary_storage_bytes,
                    d_haystack, d_needles, d_output,
                    haystack_size, needles_size,
                    compare_op,
                    stream, debug_synchronous
                )
            );

            std::vector<output_type> output(needles_size);
            HIP_CHECK(
                hipMemcpy(
                    output.data(), d_output,
                    needles_size * sizeof(output_type),
                    hipMemcpyDeviceToHost
                )
            );

            HIP_CHECK(hipFree(d_temporary_storage));
            HIP_CHECK(hipFree(d_haystack));
            HIP_CHECK(hipFree(d_needles));
            HIP_CHECK(hipFree(d_output));

            ASSERT_NO_FATAL_FAILURE(test_utils::assert_eq(output, expected));
        }
    }
}