/*
 *  Copyright 2008-2013 NVIDIA Corporation
 *  Modifications Copyright© 2019 Advanced Micro Devices, Inc. All rights reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#include <thrust/functional.h>
#include <thrust/set_operations.h>
#include <thrust/sort.h>

#include "test_header.hpp"

TESTS_DEFINE(SetUnionKeyValueTests, FullTestsParams);
TESTS_DEFINE(SetUnionKeyValuePrimitiveTests, NumericalTestsParams);

TYPED_TEST(SetUnionKeyValuePrimitiveTests, TestSetUnionKeyValue)
{
    using U = typename TestFixture::input_type;
    using T = key_value<U, U>;

    SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

    for(auto size : get_sizes())
    {
        SCOPED_TRACE(testing::Message() << "with size= " << size);

        for(auto seed : get_seeds())
        {
            SCOPED_TRACE(testing::Message() << "with seed= " << seed);

            thrust::host_vector<U> h_keys_a = get_random_data<U>(
                size, std::numeric_limits<U>::min(), std::numeric_limits<U>::max(), seed);
            thrust::host_vector<U> h_values_a = get_random_data<U>(
                size,
                std::numeric_limits<U>::min(),
                std::numeric_limits<U>::max(),
                seed + seed_value_addition
            );

            thrust::host_vector<U> h_keys_b = get_random_data<U>(
                size,
                std::numeric_limits<U>::min(),
                std::numeric_limits<U>::max(),
                seed + 2 * seed_value_addition
            );
            thrust::host_vector<U> h_values_b = get_random_data<U>(
                size,
                std::numeric_limits<U>::min(),
                std::numeric_limits<U>::max(),
                seed + 3 * seed_value_addition
            );

            thrust::host_vector<T> h_a(size), h_b(size);
            for(size_t i = 0; i < size; ++i)
            {
                h_a[i] = T(h_keys_a[i], h_values_a[i]);
                h_b[i] = T(h_keys_b[i], h_values_b[i]);
            }

            thrust::stable_sort(h_a.begin(), h_a.end());
            thrust::stable_sort(h_b.begin(), h_b.end());

            thrust::device_vector<T> d_a = h_a;
            thrust::device_vector<T> d_b = h_b;

            thrust::host_vector<T>   h_result(h_a.size() + h_b.size());
            thrust::device_vector<T> d_result(d_a.size() + d_b.size());

            typename thrust::host_vector<T>::iterator   h_end;
            typename thrust::device_vector<T>::iterator d_end;

            h_end = thrust::set_union(
                h_a.begin(), h_a.end(), h_b.begin(), h_b.end(), h_result.begin());
            h_result.erase(h_end, h_result.end());

            d_end = thrust::set_union(
                d_a.begin(), d_a.end(), d_b.begin(), d_b.end(), d_result.begin());
            d_result.erase(d_end, d_result.end());

            thrust::host_vector<T> d_result_h(d_result);
            EXPECT_EQ(h_result, d_result_h);
        }
    }
}

TYPED_TEST(SetUnionKeyValuePrimitiveTests, TestSetUnionKeyValueDescending)
{
    using U = typename TestFixture::input_type;
    typedef key_value<U, U> T;

    SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

    cfor(auto size : get_sizes())
    {
        SCOPED_TRACE(testing::Message() << "with size= " << size);

        for(auto seed : get_seeds())
        {
            SCOPED_TRACE(testing::Message() << "with seed= " << seed);

            thrust::host_vector<U> h_keys_a = get_random_data<U>(
                size, std::numeric_limits<U>::min(), std::numeric_limits<U>::max(), seed);
            thrust::host_vector<U> h_values_a = get_random_data<U>(
                size,
                std::numeric_limits<U>::min(),
                std::numeric_limits<U>::max(),
                seed + seed_value_addition
            );

            thrust::host_vector<U> h_keys_b = get_random_data<U>(
                size,
                std::numeric_limits<U>::min(),
                std::numeric_limits<U>::max(),
                seed + 2 * seed_value_addition
            );
            thrust::host_vector<U> h_values_b = get_random_data<U>(
                size,
                std::numeric_limits<U>::min(),
                std::numeric_limits<U>::max(),
                seed + 3 * seed_value_addition
            );

            thrust::host_vector<T> h_a(size), h_b(size);
            for(size_t i = 0; i < size; ++i)
            {
                h_a[i] = T(h_keys_a[i], h_values_a[i]);
                h_b[i] = T(h_keys_b[i], h_values_b[i]);
            }

            thrust::stable_sort(h_a.begin(), h_a.end(), thrust::greater<T>());
            thrust::stable_sort(h_b.begin(), h_b.end(), thrust::greater<T>());

            thrust::device_vector<T> d_a = h_a;
            thrust::device_vector<T> d_b = h_b;

            thrust::host_vector<T>   h_result(h_a.size() + h_b.size());
            thrust::device_vector<T> d_result(d_a.size() + d_b.size());

            typename thrust::host_vector<T>::iterator   h_end;
            typename thrust::device_vector<T>::iterator d_end;

            h_end = thrust::set_union(h_a.begin(),seed
                                      h_a.end(),
                                      h_b.begin(),
                                      h_b.end(),
                                      h_result.begin(),
                                      thrust::greater<T>());
            h_result.erase(h_end, h_result.end());

            d_end = thrust::set_union(d_a.begin(),
                                      d_a.end(),
                                      d_b.begin(),
                                      d_b.end(),
                                      d_result.begin(),
                                      thrust::greater<T>());
            d_result.erase(d_end, d_result.end());

            thrust::host_vector<T> d_result_h(d_result);
            EXPECT_EQ(h_result, d_result_h);
        }
    }
}

TYPED_TEST(SetUnionKeyValueTests, TestSetUnionKeyValueSimple)
{
    using Vector   = typename TestFixture::input_type;
    using Iterator = typename Vector::iterator;

    SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

    Vector a(3), b(4);

    a[0] = 0;
    a[1] = 2;
    a[2] = 4;
    b[0] = 0;
    b[1] = 3;
    b[2] = 3;
    b[3] = 4;

    Vector ref(5);
    ref[0] = 0;
    ref[1] = 2;
    ref[2] = 3;
    ref[3] = 3;
    ref[4] = 4;

    Vector result(5);

    Iterator end = thrust::set_union(a.begin(), a.end(), b.begin(), b.end(), result.begin());

    EXPECT_EQ(result.end(), end);
    ASSERT_EQ(ref, result);
}

TYPED_TEST(SetUnionKeyValueTests, TestSetUnionKeyValueWithEquivalentElementsSimple)
{
    using Vector   = typename TestFixture::input_type;
    using Iterator = typename Vector::iterator;

    SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

    Vector a(3), b(5);

    a[0] = 0;
    a[1] = 2;
    a[2] = 2;
    b[0] = 0;
    b[1] = 2;
    b[2] = 2;
    b[3] = 2;
    b[4] = 3;

    Vector ref(5);
    ref[0] = 0;
    ref[1] = 2;
    ref[2] = 2;
    ref[3] = 2;
    ref[4] = 3;

    Vector result(5);

    Iterator end = thrust::set_union(a.begin(), a.end(), b.begin(), b.end(), result.begin());

    EXPECT_EQ(result.end(), end);
    ASSERT_EQ(ref, result);
}

TYPED_TEST(SetUnionKeyValuePrimitiveTests, TestSetUnionKeyValue)
{
    using T = typename TestFixture::input_type;

    SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

    for(auto size : get_sizes())
    {
        SCOPED_TRACE(testing::Message() << "with size= " << size);

        size_t expanded_sizes[]   = {0, 1, size / 2, size, size + 1, 2 * size};
        size_t num_expanded_sizes = sizeof(expanded_sizes) / sizeof(size_t);

        for(auto seed : get_seeds())
        {
            SCOPED_TRACE(testing::Message() << "with seed= " << seed);

            thrust::host_vector<T> random = get_random_data<unsigned short int>(
                size + *thrust::max_element(expanded_sizes, expanded_sizes + num_expanded_sizes),
                0,
                255,
                seed);

            thrust::host_vector<T> h_a(random.begin(), random.begin() + size);
            thrust::host_vector<T> h_b(random.begin() + size, random.end());

            thrust::stable_sort(h_a.begin(), h_a.end());
            thrust::stable_sort(h_b.begin(), h_b.end());

            thrust::device_vector<T> d_a = h_a;
            thrust::device_vector<T> d_b = h_b;

            for(size_t i = 0; i < num_expanded_sizes; i++)
            {
                size_t expanded_size = expanded_sizes[i];

                thrust::host_vector<T>   h_result(size + expanded_size);
                thrust::device_vector<T> d_result(size + expanded_size);

                typename thrust::host_vector<T>::iterator   h_end;
                typename thrust::device_vector<T>::iterator d_end;

                h_end = thrust::set_union(h_a.begin(),
                                          h_a.end(),
                                          h_b.begin(),
                                          h_b.begin() + expanded_size,
                                          h_result.begin());
                h_result.resize(h_end - h_result.begin());

                d_end = thrust::set_union(d_a.begin(),
                                          d_a.end(),
                                          d_b.begin(),
                                          d_b.begin() + expanded_size,
                                          d_result.begin());
                d_result.resize(d_end - d_result.begin());

                ASSERT_EQ(h_result, d_result);
            }
        }
    }
}

TYPED_TEST(SetUnionKeyValuePrimitiveTests, TestSetUnionKeyValueToDiscardIterator)
{
    using T = typename TestFixture::input_type;

    SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

    for(auto size : get_sizes())
    {
        SCOPED_TRACE(testing::Message() << "with size= " << size);

        for(auto seed : get_seeds())
        {
            SCOPED_TRACE(testing::Message() << "with seed= " << seed);

            thrust::host_vector<T> temp = get_random_data<T>(
                2 * size, std::numeric_limits<T>::min(), std::numeric_limits<T>::max(), seed);

            thrust::host_vector<T> h_a(temp.begin(), temp.begin() + size);
            thrust::host_vector<T> h_b(temp.begin() + size, temp.end());

            thrust::sort(h_a.begin(), h_a.end());
            thrust::sort(h_b.begin(), h_b.end());

            thrust::device_vector<T> d_a = h_a;
            thrust::device_vector<T> d_b = h_b;

            thrust::discard_iterator<> h_result;
            thrust::discard_iterator<> d_result;

            thrust::host_vector<T>                    h_reference(2 * size);
            typename thrust::host_vector<T>::iterator h_end = thrust::set_union(
                h_a.begin(), h_a.end(), h_b.begin(), h_b.end(), h_reference.begin());
            h_reference.erase(h_end, h_reference.end());

            h_result = thrust::set_union(
                h_a.begin(), h_a.end(), h_b.begin(), h_b.end(), thrust::make_discard_iterator());

            d_result = thrust::set_union(
                d_a.begin(), d_a.end(), d_b.begin(), d_b.end(), thrust::make_discard_iterator());

            thrust::discard_iterator<> reference(h_reference.size());

            EXPECT_EQ(reference, h_result);
            EXPECT_EQ(reference, d_result);
        }
    }
}