/*
 *  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(SetDifferenceDescendingTests, FullTestsParams);
TESTS_DEFINE(SetDifferenceDescendingPrimitiveTests, NumericalTestsParams);

TYPED_TEST(SetDifferenceDescendingTests, TestSetDifferenceDescendingSimple)
{
    using Vector   = typename TestFixture::input_type;
    using Policy   = typename TestFixture::execution_policy;
    using T        = typename Vector::value_type;
    using Iterator = typename Vector::iterator;

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

    Vector a(4), b(5);

    a[0] = 5;
    a[1] = 4;
    a[2] = 2;
    a[3] = 0;
    b[0] = 6;
    b[1] = 4;
    b[2] = 3;
    b[3] = 3;
    b[4] = 0;

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

    Vector result(2);

    Iterator end = thrust::set_difference(
        Policy{}, a.begin(), a.end(), b.begin(), b.end(), result.begin(), thrust::greater<T>());

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

TYPED_TEST(SetDifferenceDescendingPrimitiveTests, TestSetDifferenceDescending)
{
    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::greater<T>());
            thrust::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(size);
            thrust::device_vector<T> d_result(size);

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

            h_end = thrust::set_difference(h_a.begin(),
                                           h_a.end(),
                                           h_b.begin(),
                                           h_b.end(),
                                           h_result.begin(),
                                           thrust::greater<T>());
            h_result.resize(h_end - h_result.begin());

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

            d_result.resize(d_end - d_result.begin());

            ASSERT_EQ(h_result, d_result);
        }
    }
}
