/*
 *  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/iterator/zip_iterator.h>
#include <thrust/scan.h>

#include "test_header.hpp"

TESTS_DEFINE(ZipIteratorScanVariablesTests, NumericalTestsParams);

template <typename Tuple>
struct TuplePlus
{
    __host__ __device__ Tuple operator()(Tuple x, Tuple y) const
    {
        using namespace thrust;
        return make_tuple(get<0>(x) + get<0>(y), get<1>(x) + get<1>(y));
    }
}; // end SumTuple

TYPED_TEST(ZipIteratorScanVariablesTests, TestZipIteratorScan)
{
    using T = typename TestFixture::input_type;

    const std::vector<size_t> sizes = get_sizes();
    for(auto size : sizes)
    {
        using namespace thrust;

        thrust::host_vector<T> h_data0 = get_random_data<T>(
            size, std::numeric_limits<T>::min(), std::numeric_limits<T>::max());
        thrust::host_vector<T> h_data1 = get_random_data<T>(
            size, std::numeric_limits<T>::min(), std::numeric_limits<T>::max());

        device_vector<T> d_data0 = h_data0;
        device_vector<T> d_data1 = h_data1;

        typedef tuple<T, T> Tuple;

        host_vector<Tuple>   h_result(size);
        device_vector<Tuple> d_result(size);

        // inclusive_scan (tuple output)
        inclusive_scan(make_zip_iterator(make_tuple(h_data0.begin(), h_data1.begin())),
                       make_zip_iterator(make_tuple(h_data0.end(), h_data1.end())),
                       h_result.begin(),
                       TuplePlus<Tuple>());
        inclusive_scan(make_zip_iterator(make_tuple(d_data0.begin(), d_data1.begin())),
                       make_zip_iterator(make_tuple(d_data0.end(), d_data1.end())),
                       d_result.begin(),
                       TuplePlus<Tuple>());
        ASSERT_EQ_QUIET(h_result, d_result);

        // exclusive_scan (tuple output)
        exclusive_scan(make_zip_iterator(make_tuple(h_data0.begin(), h_data1.begin())),
                       make_zip_iterator(make_tuple(h_data0.end(), h_data1.end())),
                       h_result.begin(),
                       make_tuple<T, T>(0, 0),
                       TuplePlus<Tuple>());
        exclusive_scan(make_zip_iterator(make_tuple(d_data0.begin(), d_data1.begin())),
                       make_zip_iterator(make_tuple(d_data0.end(), d_data1.end())),
                       d_result.begin(),
                       make_tuple<T, T>(0, 0),
                       TuplePlus<Tuple>());
        ASSERT_EQ_QUIET(h_result, d_result);

        host_vector<T>   h_result0(size);
        host_vector<T>   h_result1(size);
        device_vector<T> d_result0(size);
        device_vector<T> d_result1(size);

        // inclusive_scan (zip_iterator output)
        inclusive_scan(make_zip_iterator(make_tuple(h_data0.begin(), h_data1.begin())),
                       make_zip_iterator(make_tuple(h_data0.end(), h_data1.end())),
                       make_zip_iterator(make_tuple(h_result0.begin(), h_result1.begin())),
                       TuplePlus<Tuple>());
        inclusive_scan(make_zip_iterator(make_tuple(d_data0.begin(), d_data1.begin())),
                       make_zip_iterator(make_tuple(d_data0.end(), d_data1.end())),
                       make_zip_iterator(make_tuple(d_result0.begin(), d_result1.begin())),
                       TuplePlus<Tuple>());
        ASSERT_EQ_QUIET(h_result0, d_result0);
        ASSERT_EQ_QUIET(h_result1, d_result1);

        // exclusive_scan (zip_iterator output)
        exclusive_scan(make_zip_iterator(make_tuple(h_data0.begin(), h_data1.begin())),
                       make_zip_iterator(make_tuple(h_data0.end(), h_data1.end())),
                       make_zip_iterator(make_tuple(h_result0.begin(), h_result1.begin())),
                       make_tuple<T, T>(0, 0),
                       TuplePlus<Tuple>());
        exclusive_scan(make_zip_iterator(make_tuple(d_data0.begin(), d_data1.begin())),
                       make_zip_iterator(make_tuple(d_data0.end(), d_data1.end())),
                       make_zip_iterator(make_tuple(d_result0.begin(), d_result1.begin())),
                       make_tuple<T, T>(0, 0),
                       TuplePlus<Tuple>());
        ASSERT_EQ_QUIET(h_result0, d_result0);
        ASSERT_EQ_QUIET(h_result1, d_result1);
    }
}