/*
 *  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/copy.h>
#include <thrust/iterator/counting_iterator.h>
#include <thrust/iterator/zip_iterator.h>
#include <thrust/sequence.h>
#include <thrust/transform.h>

#include "test_header.hpp"

typedef ::testing::Types<Params<int>, Params<unsigned int>, Params<float>>
    ZipIteratorTests32BitParams;

TESTS_DEFINE(ZipIterator32BitTests, ZipIteratorTests32BitParams);

TESTS_DEFINE(ZipIteratorVectorTests, NumericalTestsParams);

TESTS_DEFINE(ZipIteratorNumericTests, NumericalTestsParams);

TEST(ZipIterator32BitTests, UsingHip)
{
    SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

    ASSERT_EQ(THRUST_DEVICE_SYSTEM, THRUST_DEVICE_SYSTEM_HIP);
}

TYPED_TEST(ZipIteratorVectorTests, TestZipIteratorManipulation)
{
    using T = typename TestFixture::input_type;
    using namespace thrust;

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

    thrust::device_vector<T> v0(4);
    thrust::device_vector<T> v1(4);
    thrust::device_vector<T> v2(4);

    // initialize input
    sequence(v0.begin(), v0.end());
    sequence(v1.begin(), v1.end());
    sequence(v2.begin(), v2.end());

    using IteratorTuple = tuple<typename thrust::device_vector<T>::iterator,
                                typename thrust::device_vector<T>::iterator>;

    IteratorTuple t = make_tuple(v0.begin(), v1.begin());

    using ZipIterator = zip_iterator<IteratorTuple>;

    // test construction
    ZipIterator iter0 = make_zip_iterator(t);

    ASSERT_EQ_QUIET(v0.begin(), get<0>(iter0.get_iterator_tuple()));
    ASSERT_EQ_QUIET(v1.begin(), get<1>(iter0.get_iterator_tuple()));

    // test dereference
    ASSERT_EQ(*v0.begin(), get<0>(*iter0));
    ASSERT_EQ(*v1.begin(), get<1>(*iter0));

    // test equality
    ZipIterator iter1 = iter0;
    ZipIterator iter2 = make_zip_iterator(make_tuple(v0.begin(), v2.begin()));
    ZipIterator iter3 = make_zip_iterator(make_tuple(v1.begin(), v2.begin()));
    ASSERT_EQ(true, iter0 == iter1);
    ASSERT_EQ(true, iter0 == iter2);
    ASSERT_EQ(false, iter0 == iter3);

    // test inequality
    ASSERT_EQ(false, iter0 != iter1);
    ASSERT_EQ(false, iter0 != iter2);
    ASSERT_EQ(true, iter0 != iter3);

    // test advance
    ZipIterator iter4 = iter0 + 1;
    ASSERT_EQ_QUIET(v0.begin() + 1, get<0>(iter4.get_iterator_tuple()));
    ASSERT_EQ_QUIET(v1.begin() + 1, get<1>(iter4.get_iterator_tuple()));

    // test pre-increment
    ++iter4;
    ASSERT_EQ_QUIET(v0.begin() + 2, get<0>(iter4.get_iterator_tuple()));
    ASSERT_EQ_QUIET(v1.begin() + 2, get<1>(iter4.get_iterator_tuple()));

    // test post-increment
    iter4++;
    ASSERT_EQ_QUIET(v0.begin() + 3, get<0>(iter4.get_iterator_tuple()));
    ASSERT_EQ_QUIET(v1.begin() + 3, get<1>(iter4.get_iterator_tuple()));

    // test pre-decrement
    --iter4;
    ASSERT_EQ_QUIET(v0.begin() + 2, get<0>(iter4.get_iterator_tuple()));
    ASSERT_EQ_QUIET(v1.begin() + 2, get<1>(iter4.get_iterator_tuple()));

    // test post-decrement
    iter4--;
    ASSERT_EQ_QUIET(v0.begin() + 1, get<0>(iter4.get_iterator_tuple()));
    ASSERT_EQ_QUIET(v1.begin() + 1, get<1>(iter4.get_iterator_tuple()));

    // test difference
    ASSERT_EQ(1, iter4 - iter0);
    ASSERT_EQ(-1, iter0 - iter4);
}

TYPED_TEST(ZipIteratorVectorTests, TestZipIteratorReference)
{
    using T = typename TestFixture::input_type;
    using namespace thrust;

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

    // test host types
    using Iterator1      = typename host_vector<T>::iterator;
    using Iterator2      = typename host_vector<T>::const_iterator;
    using IteratorTuple1 = tuple<Iterator1, Iterator2>;
    using ZipIterator1   = zip_iterator<IteratorTuple1>;

    using zip_iterator_reference_type1 = typename iterator_reference<ZipIterator1>::type;

    host_vector<T> h_variable(1);

    using reference_type1 = tuple<T&, const T&>;

    reference_type1              ref1(*h_variable.begin(), *h_variable.cbegin());
    zip_iterator_reference_type1 test1(*h_variable.begin(), *h_variable.cbegin());

    ASSERT_EQ_QUIET(ref1, test1);
    ASSERT_EQ(get<0>(ref1), get<0>(test1));
    ASSERT_EQ(get<1>(ref1), get<1>(test1));

    // test device types
    using Iterator3      = typename device_vector<T>::iterator;
    using Iterator4      = typename device_vector<T>::const_iterator;
    using IteratorTuple2 = tuple<Iterator3, Iterator4>;
    using ZipIterator2   = zip_iterator<IteratorTuple2>;

    using zip_iterator_reference_type2 = typename iterator_reference<ZipIterator2>::type;

    device_vector<T> d_variable(1);

    using reference_type2 = tuple<device_reference<T>, device_reference<const T>>;

    reference_type2              ref2(*d_variable.begin(), *d_variable.cbegin());
    zip_iterator_reference_type2 test2(*d_variable.begin(), *d_variable.cbegin());

    ASSERT_EQ_QUIET(ref2, test2);
    ASSERT_EQ(get<0>(ref2), get<0>(test2));
    ASSERT_EQ(get<1>(ref2), get<1>(test2));
}

// undefined reference to `thrust::detail::integral_constant<bool, true>::value' for asserts
TYPED_TEST(ZipIteratorNumericTests, TestZipIteratorTraversal)
{
    //    using T = typename TestFixture::input_type;
    using namespace thrust;

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

#if 0
    // test host types
    using Iterator1 = typename host_vector<T>::iterator;
    using Iterator2 = typename host_vector<T>::const_iterator;
    using IteratorTuple1 = tuple<Iterator1, Iterator2>;
    using ZipIterator1 = zip_iterator<IteratorTuple1>;

    using zip_iterator_traversal_type1 = typename iterator_traversal<ZipIterator1>::type;

    ASSERT_EQ(true,
              (detail::is_convertible<zip_iterator_traversal_type1, random_access_traversal_tag>::value));
#endif

#if 0
    // test device types
    using Iterator3 = typename device_vector<T>::iterator;
    using Iterator4 = typename device_vector<T>::const_iterator;
    using IteratorTuple2 = tuple<Iterator3,Iterator4>;
    using ZipIterator2 = zip_iterator<IteratorTuple2>;

    using zip_iterator_traversal_type2 = typename iterator_traversal<ZipIterator2>::type;

    ASSERT_EQ(true,
                  (detail::is_convertible<zip_iterator_traversal_type2, thrust::random_access_traversal_tag>::value));
#endif
}

// undefined reference to `thrust::detail::integral_constant<bool, true>::value' for asserts
// also use of experimental::space::XXXXXXXXXX
TYPED_TEST(ZipIteratorNumericTests, TestZipIteratorSystem)
{
    //    using T = typename TestFixture::input_type;
    using namespace thrust;

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

#if 0
    // test host types
    using Iterator1 = typename host_vector<T>::iterator;
    using Iterator2 = typename host_vector<T>::const_iterator;
    using IteratorTuple1 = tuple<Iterator1,Iterator2>;
    using ZipIterator1 = zip_iterator<IteratorTuple1>;

    using zip_iterator_system_type1 = typename iterator_system<ZipIterator1>::type;
#endif

    //    ASSERT_EQ(true, (detail::is_same<zip_iterator_system_type1, experimental::space::host>::value) );

#if 0
    // test device types
    using Iterator3 = typename device_vector<T>::iterator;
    using Iterator4 = typename device_vector<T>::const_iterator;
    using IteratorTuple2 = tuple<Iterator3,Iterator4>;
    using ZipIterator2 = zip_iterator<IteratorTuple1>;

    using zip_iterator_system_type2 = typename iterator_system<ZipIterator2>::type;
#endif

    //ASSERT_EQUAL(true, (detail::is_convertible<zip_iterator_system_type2, experimental::space::device>::value) );

#if 0
    // test any
    using Iterator5 = counting_iterator<T>;
    using Iterator6 = counting_iterator<const T>;
    using IteratorTuple3 = tuple<Iterator5, Iterator6>;
    using ZipIterator3 = zip_iterator<IteratorTuple3>;

    using zip_iterator_system_type3 = typename iterator_system<ZipIterator3>::type;
#endif

    //ASSERT_EQ(true, (detail::is_convertible<zip_iterator_system_type3, thrust::experimental::space::any>::value) );

#if 0
    // test host/any
    using IteratorTuple4 = tuple<Iterator1, Iterator5>;
    using ZipIterator4 = zip_iterator<IteratorTuple4>;

    using zip_iterator_system_type4 = typename iterator_system<ZipIterator4>::type;
#endif

    //    ASSERT_EQ(true, (detail::is_convertible<zip_iterator_system_type4, thrust::host_system_tag>::value) );

#if 0
    // test any/host
using IteratorTuple5 = tuple<Iterator5, Iterator1>;
using ZipIterator5 = zip_iterator<IteratorTuple5>;

using zip_iterator_system_type5 = typename iterator_system<ZipIterator5>::type;
#endif

    //ASSERT_EQ(true, (detail::is_convertible<zip_iterator_system_type5, thrust::host_system_tag>::value) );

#if 0
    // test device/any
using IteratorTuple6 = tuple<Iterator3, Iterator5>;
using ZipIterator6 = zip_iterator<IteratorTuple6>;

using zip_iterator_system_type6 = typename iterator_system<ZipIterator6>::type;
#endif

    //ASSERT_EQ(true, (detail::is_convertible<zip_iterator_system_type6, thrust::device_system_tag>::value) );

#if 0
    // test any/device
using IteratorTuple7 = tuple<Iterator5, Iterator3>;
using ZipIterator7 = zip_iterator<IteratorTuple7>;

using zip_iterator_system_type7 = typename iterator_system<ZipIterator7>::type;
#endif

    //        ASSERT_EQ(true, (detail::is_convertible<zip_iterator_system_type7, thrust::device_system_tag>::value) );
}

TYPED_TEST(ZipIteratorVectorTests, TestZipIteratorCopy)
{
    using T = typename TestFixture::input_type;
    using namespace thrust;

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

    thrust::device_vector<T> input0(4), input1(4);
    thrust::device_vector<T> output0(4), output1(4);

    // initialize input
    sequence(input0.begin(), input0.end(), 0);
    sequence(input1.begin(), input1.end(), 13);

    copy(make_zip_iterator(make_tuple(input0.begin(), input1.begin())),
         make_zip_iterator(make_tuple(input0.end(), input1.end())),
         make_zip_iterator(make_tuple(output0.begin(), output1.begin())));

    ASSERT_EQ(input0, output0);
    ASSERT_EQ(input1, output1);
}

struct SumTwoTuple
{
    template <typename Tuple>
    __host__ __device__ typename thrust::detail::remove_reference<
        typename thrust::tuple_element<0, Tuple>::type>::type
    operator()(Tuple x) const
    {
        return thrust::get<0>(x) + thrust::get<1>(x);
    }
}; // end SumTwoTuple

struct SumThreeTuple
{
    template <typename Tuple>
    __host__ __device__ typename thrust::detail::remove_reference<
        typename thrust::tuple_element<0, Tuple>::type>::type
    operator()(Tuple x) const
    {
        return thrust::get<0>(x) + thrust::get<1>(x) + thrust::get<2>(x);
    }
}; // end SumThreeTuple

TYPED_TEST(ZipIterator32BitTests, TestZipIteratorTransform)
{
    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> h_data0 = get_random_data<T>(size, 0, 10, seed);
            thrust::host_vector<T> h_data1 = get_random_data<T>(
                size,
                0,
                10,
                seed + seed_value_addition
            );
            thrust::host_vector<T> h_data2 = get_random_data<T>(
                size,
                0,
                10,
                seed + 2 * seed_value_addition
            );

            thrust::device_vector<T> d_data0 = h_data0;
            thrust::device_vector<T> d_data1 = h_data1;
            thrust::device_vector<T> d_data2 = h_data2;

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

            // Tuples with 2 elements
            transform(
                thrust::make_zip_iterator(thrust::make_tuple(h_data0.begin(), h_data1.begin())),
                thrust::make_zip_iterator(thrust::make_tuple(h_data0.end(), h_data1.end())),
                h_result.begin(),
                SumTwoTuple());
            transform(
                thrust::make_zip_iterator(thrust::make_tuple(d_data0.begin(), d_data1.begin())),
                thrust::make_zip_iterator(thrust::make_tuple(d_data0.end(), d_data1.end())),
                d_result.begin(),
                SumTwoTuple());
            ASSERT_EQ_QUIET(h_result, d_result);

            // Tuples with 3 elements
            transform(
                thrust::make_zip_iterator(thrust::make_tuple(h_data0.begin(), h_data1.begin(), h_data2.begin())),
                thrust::make_zip_iterator(thrust::make_tuple(h_data0.end(), h_data1.end(), h_data2.end())),
                h_result.begin(),
                SumThreeTuple());
            transform(
                thrust::make_zip_iterator(thrust::make_tuple(d_data0.begin(), d_data1.begin(), d_data2.begin())),
                thrust::make_zip_iterator(thrust::make_tuple(d_data0.end(), d_data1.end(), d_data2.end())),
                d_result.begin(),
                SumThreeTuple());
            ASSERT_EQ_QUIET(h_result, d_result);
        }
    }
}

TEST(ZipIterator32BitTests, TestZipIteratorCopyAoSToSoA)
{
    using namespace thrust;

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

    const size_t n = 1;

    using structure                  = tuple<int, int>;
    using host_array_of_structures   = host_vector<structure>;
    using device_array_of_structures = device_vector<structure>;

    using host_structure_of_arrays
        = zip_iterator<tuple<host_vector<int>::iterator, host_vector<int>::iterator>>;

    using device_structure_of_arrays
        = zip_iterator<tuple<device_vector<int>::iterator, device_vector<int>::iterator>>;

    host_array_of_structures   h_aos(n, make_tuple(7, 13));
    device_array_of_structures d_aos(n, make_tuple(7, 13));

    // host to host
    host_vector<int>         h_field0(n), h_field1(n);
    host_structure_of_arrays h_soa
        = make_zip_iterator(make_tuple(h_field0.begin(), h_field1.begin()));

    thrust::copy(h_aos.begin(), h_aos.end(), h_soa);
    ASSERT_EQ_QUIET(make_tuple(7, 13), h_soa[0]);

    // host to device
    device_vector<int>         d_field0(n), d_field1(n);
    device_structure_of_arrays d_soa
        = make_zip_iterator(make_tuple(d_field0.begin(), d_field1.begin()));

    thrust::copy(h_aos.begin(), h_aos.end(), d_soa);
    ASSERT_EQ_QUIET(make_tuple(7, 13), d_soa[0]);

    // device to device
    thrust::fill(d_field0.begin(), d_field0.end(), 0);
    thrust::fill(d_field1.begin(), d_field1.end(), 0);

    thrust::copy(d_aos.begin(), d_aos.end(), d_soa);
    ASSERT_EQ_QUIET(make_tuple(7, 13), d_soa[0]);

    // device to host
    thrust::fill(h_field0.begin(), h_field0.end(), 0);
    thrust::fill(h_field1.begin(), h_field1.end(), 0);

    thrust::copy(d_aos.begin(), d_aos.end(), h_soa);
    ASSERT_EQ_QUIET(make_tuple(7, 13), h_soa[0]);
}

TEST(ZipIterator32BitTests, TestZipIteratorCopySoAToAoS)
{
    using namespace thrust;

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

    const size_t n = 1;

    using structure                  = tuple<int, int>;
    using host_array_of_structures   = host_vector<structure>;
    using device_array_of_structures = device_vector<structure>;

    using host_structure_of_arrays
        = zip_iterator<tuple<host_vector<int>::iterator, host_vector<int>::iterator>>;
    using device_structure_of_arrays
        = zip_iterator<tuple<device_vector<int>::iterator, device_vector<int>::iterator>>;

    host_vector<int>   h_field0(n, 7), h_field1(n, 13);
    device_vector<int> d_field0(n, 7), d_field1(n, 13);

    host_structure_of_arrays h_soa
        = make_zip_iterator(make_tuple(h_field0.begin(), h_field1.begin()));
    device_structure_of_arrays d_soa
        = make_zip_iterator(make_tuple(d_field0.begin(), d_field1.begin()));

    host_array_of_structures   h_aos(n);
    device_array_of_structures d_aos(n);

    // host to host
    thrust::fill(h_aos.begin(), h_aos.end(), make_tuple(0, 0));

    thrust::copy(h_soa, h_soa + n, h_aos.begin());
    ASSERT_EQ_QUIET(7, get<0>(h_soa[0]));
    ASSERT_EQ_QUIET(13, get<1>(h_soa[0]));

    // host to device
    thrust::fill(d_aos.begin(), d_aos.end(), make_tuple(0, 0));

    thrust::copy(h_soa, h_soa + n, d_aos.begin());
    ASSERT_EQ_QUIET(7, get<0>(d_soa[0]));
    ASSERT_EQ_QUIET(13, get<1>(d_soa[0]));

    // device to device
    thrust::fill(d_aos.begin(), d_aos.end(), make_tuple(0, 0));

    thrust::copy(d_soa, d_soa + n, d_aos.begin());
    ASSERT_EQ_QUIET(7, get<0>(d_soa[0]));
    ASSERT_EQ_QUIET(13, get<1>(d_soa[0]));

    // device to host
    thrust::fill(h_aos.begin(), h_aos.end(), make_tuple(0, 0));

    thrust::copy(d_soa, d_soa + n, h_aos.begin());
    ASSERT_EQ_QUIET(7, get<0>(h_soa[0]));
    ASSERT_EQ_QUIET(13, get<1>(h_soa[0]));
}