/*
 *  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/device_vector.h>
#include <thrust/iterator/constant_iterator.h>
#include <thrust/reduce.h>
#include <thrust/transform.h>

#include "test_header.hpp"

using namespace thrust;

TESTS_DEFINE(ConstantIteratorTests, VectorSignedTestsParams);

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

    ASSERT_EQ(THRUST_DEVICE_SYSTEM, THRUST_DEVICE_SYSTEM_HIP);
}

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

    constant_iterator<int> default_system(13);

    constant_iterator<int, use_default, host_system_tag> host_system = default_system;
    ASSERT_EQ(*default_system, *host_system);

    constant_iterator<int, use_default, device_system_tag> device_system = default_system;
    ASSERT_EQ(*default_system, *device_system);
}

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

    constant_iterator<int> lhs(0, 0);
    constant_iterator<int> rhs(0, 0);

    ASSERT_EQ(0, lhs - rhs);

    lhs++;
    ASSERT_EQ(1, lhs - rhs);

    lhs++;
    lhs++;
    ASSERT_EQ(3, lhs - rhs);

    lhs += 5;
    ASSERT_EQ(8, lhs - rhs);

    lhs -= 10;
    ASSERT_EQ(-2, lhs - rhs);
}

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

    constant_iterator<int> iter1(0);
    constant_iterator<int> iter2(0);

    ASSERT_EQ(0, iter1 - iter2);
    ASSERT_EQ(true, iter1 == iter2);

    iter1++;

    ASSERT_EQ(1, iter1 - iter2);
    ASSERT_EQ(false, iter1 == iter2);

    iter2++;

    ASSERT_EQ(0, iter1 - iter2);
    ASSERT_EQ(true, iter1 == iter2);

    iter1 += 100;
    iter2 += 100;

    ASSERT_EQ(0, iter1 - iter2);
    ASSERT_EQ(true, iter1 == iter2);
}

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

    // test one argument version
    constant_iterator<int> iter0 = make_constant_iterator<int>(13);

    ASSERT_EQ(13, *iter0);

    // test two argument version
    constant_iterator<int,thrust::detail::intmax_t> iter1 = make_constant_iterator<int,thrust::detail::intmax_t>(13, 7);
    ASSERT_EQ(13, *iter1);
    ASSERT_EQ(7, iter1 - iter0);
}

TYPED_TEST(ConstantIteratorTests, MakeConstantIterator)
{
    using Vector = typename TestFixture::input_type;

    using ConstIter = constant_iterator<int>;

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

    Vector result(4);

    ConstIter first = make_constant_iterator<int>(7);
    ConstIter last  = first + result.size();
    copy(first, last, result.begin());

    ASSERT_EQ(7, result[0]);
    ASSERT_EQ(7, result[1]);
    ASSERT_EQ(7, result[2]);
    ASSERT_EQ(7, result[3]);
};

TYPED_TEST(ConstantIteratorTests, ConstantIteratorTransform)
{
    SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());

    using Vector = typename TestFixture::input_type;
    using T      = typename Vector::value_type;

    using ConstIter = constant_iterator<T>;

    Vector result(4);

    ConstIter first1 = make_constant_iterator<T>(7);
    ConstIter last1  = first1 + result.size();
    ConstIter first2 = make_constant_iterator<T>(3);

    transform(first1, last1, result.begin(), negate<T>());

    ASSERT_EQ(-7, result[0]);
    ASSERT_EQ(-7, result[1]);
    ASSERT_EQ(-7, result[2]);
    ASSERT_EQ(-7, result[3]);

    transform(first1, last1, first2, result.begin(), plus<T>());

    ASSERT_EQ(10, result[0]);
    ASSERT_EQ(10, result[1]);
    ASSERT_EQ(10, result[2]);
    ASSERT_EQ(10, result[3]);
};

TYPED_TEST(ConstantIteratorTests, ConstantIteratorReduce)
{
    SCOPED_TRACE(testing::Message() << "with device_id= " << test::set_device_from_ctest());
    
    using Vector = typename TestFixture::input_type;
    using T      = typename Vector::value_type;

    using ConstIter = constant_iterator<T>;

    ConstIter first = make_constant_iterator<T>(7);
    ConstIter last  = first + 4;

    T sum = reduce(first, last);

    ASSERT_EQ(sum, 4 * 7);
};