// MIT License
//
// Copyright (c) 2017 Advanced Micro Devices, Inc. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>

// Google Test
#include <gtest/gtest.h>
// HIP API
#include <hip/hip_runtime.h>
// rocPRIM API
#include <rocprim/rocprim.hpp>

#include "test_utils.hpp"

#define HIP_CHECK(error) ASSERT_EQ(static_cast<hipError_t>(error),hipSuccess)

// Params for tests
template<
    class InputType,
    class OutputType = InputType,
    class FlagType = unsigned int,
    bool UseIdentityIterator = false
>
struct DevicePartitionParams
{
    using input_type = InputType;
    using output_type = OutputType;
    using flag_type = FlagType;
    static constexpr bool use_identity_iterator = UseIdentityIterator;
};

template<class Params>
class RocprimDevicePartitionTests : public ::testing::Test
{
public:
    using input_type = typename Params::input_type;
    using output_type = typename Params::output_type;
    using flag_type = typename Params::flag_type;
    const bool debug_synchronous = false;
    static constexpr bool use_identity_iterator = Params::use_identity_iterator;
};

typedef ::testing::Types<
    DevicePartitionParams<int, int, unsigned char, true>,
    DevicePartitionParams<unsigned int, unsigned long>,
    DevicePartitionParams<unsigned char, float>,
    DevicePartitionParams<int8_t, int8_t>,
    DevicePartitionParams<uint8_t, uint8_t>,
    DevicePartitionParams<rocprim::half, rocprim::half>,
    DevicePartitionParams<test_utils::custom_test_type<long long>>
> RocprimDevicePartitionTestsParams;

std::vector<size_t> get_sizes()
{
    std::vector<size_t> sizes = {
        2, 32, 64, 256,
        1024, 2048,
        3072, 4096,
        27845, (1 << 18) + 1111,
        1024 * 1024 * 32
    };
    const std::vector<size_t> random_sizes = test_utils::get_random_data<size_t>(2, 1, 16384);
    sizes.insert(sizes.end(), random_sizes.begin(), random_sizes.end());
    std::sort(sizes.begin(), sizes.end());
    return sizes;
}

TYPED_TEST_CASE(RocprimDevicePartitionTests, RocprimDevicePartitionTestsParams);

TYPED_TEST(RocprimDevicePartitionTests, Flagged)
{
    using T = typename TestFixture::input_type;
    using U = typename TestFixture::output_type;
    using F = typename TestFixture::flag_type;
    static constexpr bool use_identity_iterator = TestFixture::use_identity_iterator;
    const bool debug_synchronous = TestFixture::debug_synchronous;

    hipStream_t stream = 0; // default stream

    const std::vector<size_t> sizes = get_sizes();
    for(auto size : sizes)
    {
        SCOPED_TRACE(testing::Message() << "with size = " << size);

        // Generate data
        std::vector<T> input = test_utils::get_random_data<T>(size, 1, 100);
        std::vector<F> flags = test_utils::get_random_data01<F>(size, 0.25);

        T * d_input;
        F * d_flags;
        U * d_output;
        unsigned int * d_selected_count_output;
        HIP_CHECK(hipMalloc(&d_input, input.size() * sizeof(T)));
        HIP_CHECK(hipMalloc(&d_flags, flags.size() * sizeof(F)));
        HIP_CHECK(hipMalloc(&d_output, input.size() * sizeof(U)));
        HIP_CHECK(hipMalloc(&d_selected_count_output, sizeof(unsigned int)));
        HIP_CHECK(
            hipMemcpy(
                d_input, input.data(),
                input.size() * sizeof(T),
                hipMemcpyHostToDevice
            )
        );
        HIP_CHECK(
            hipMemcpy(
                d_flags, flags.data(),
                flags.size() * sizeof(F),
                hipMemcpyHostToDevice
            )
        );
        HIP_CHECK(hipDeviceSynchronize());

        // Calculate expected_selected and expected_rejected results on host
        std::vector<U> expected_selected;
        std::vector<U> expected_rejected;
        expected_selected.reserve(input.size()/2);
        expected_rejected.reserve(input.size()/2);
        for(size_t i = 0; i < input.size(); i++)
        {
            if(flags[i] != 0)
            {
                expected_selected.push_back(input[i]);
            }
            else
            {
                expected_rejected.push_back(input[i]);
            }
        }
        std::reverse(expected_rejected.begin(), expected_rejected.end());

        // temp storage
        size_t temp_storage_size_bytes;
        // Get size of d_temp_storage
        HIP_CHECK(
            rocprim::partition(
                nullptr,
                temp_storage_size_bytes,
                d_input,
                d_flags,
                test_utils::wrap_in_identity_iterator<use_identity_iterator>(d_output),
                d_selected_count_output,
                input.size(),
                stream,
                debug_synchronous
            )
        );
        HIP_CHECK(hipDeviceSynchronize());

        // temp_storage_size_bytes must be >0
        ASSERT_GT(temp_storage_size_bytes, 0);

        // allocate temporary storage
        void * d_temp_storage = nullptr;
        HIP_CHECK(hipMalloc(&d_temp_storage, temp_storage_size_bytes));
        HIP_CHECK(hipDeviceSynchronize());

        // Run
        HIP_CHECK(
            rocprim::partition(
                d_temp_storage,
                temp_storage_size_bytes,
                d_input,
                d_flags,
                test_utils::wrap_in_identity_iterator<use_identity_iterator>(d_output),
                d_selected_count_output,
                input.size(),
                stream,
                debug_synchronous
            )
        );
        HIP_CHECK(hipDeviceSynchronize());

        // Check if number of selected value is as expected_selected
        unsigned int selected_count_output = 0;
        HIP_CHECK(
            hipMemcpy(
                &selected_count_output, d_selected_count_output,
                sizeof(unsigned int),
                hipMemcpyDeviceToHost
            )
        );
        HIP_CHECK(hipDeviceSynchronize());
        ASSERT_EQ(selected_count_output, expected_selected.size());

        // Check if output values are as expected_selected
        std::vector<U> output(input.size());
        HIP_CHECK(
            hipMemcpy(
                output.data(), d_output,
                output.size() * sizeof(U),
                hipMemcpyDeviceToHost
            )
        );
        HIP_CHECK(hipDeviceSynchronize());

        std::vector<U> output_rejected;
        for(size_t i = 0; i < expected_rejected.size(); i++)
        {
            auto j = i + expected_selected.size();
            output_rejected.push_back(output[j]);
        }
        ASSERT_NO_FATAL_FAILURE(test_utils::custom_assert_eq(output, expected_selected, expected_selected.size()));
        ASSERT_NO_FATAL_FAILURE(test_utils::custom_assert_eq(output_rejected, expected_rejected, expected_rejected.size()));

        hipFree(d_input);
        hipFree(d_flags);
        hipFree(d_output);
        hipFree(d_selected_count_output);
        hipFree(d_temp_storage);
    }
}

TYPED_TEST(RocprimDevicePartitionTests, PredicateEmptyInput)
{
    using T = typename TestFixture::input_type;
    using U = typename TestFixture::output_type;
    const bool debug_synchronous = TestFixture::debug_synchronous;

    hipStream_t stream = 0; // default stream

    auto select_op = [] __host__ __device__ (const T& value) -> bool
    {
        if(value == T(50)) return true;
        return false;
    };

    U * d_output;
    unsigned int * d_selected_count_output;
    HIP_CHECK(hipMalloc(&d_output, sizeof(U)));
    HIP_CHECK(hipMalloc(&d_selected_count_output, sizeof(unsigned int)));
    unsigned int selected_count_output = 123;
    HIP_CHECK(
        hipMemcpy(
            d_selected_count_output, &selected_count_output,
            sizeof(unsigned int),
            hipMemcpyHostToDevice
        )
    );

    test_utils::out_of_bounds_flag out_of_bounds;
    test_utils::bounds_checking_iterator<U> d_checking_output(
        d_output,
        out_of_bounds.device_pointer(),
        0
    );

    // temp storage
    size_t temp_storage_size_bytes;
    // Get size of d_temp_storage
    HIP_CHECK(
        rocprim::partition(
            nullptr,
            temp_storage_size_bytes,
            rocprim::make_constant_iterator<T>(T(345)),
            d_checking_output,
            d_selected_count_output,
            0,
            select_op,
            stream,
            debug_synchronous
        )
    );
    HIP_CHECK(hipDeviceSynchronize());

    // allocate temporary storage
    void * d_temp_storage = nullptr;
    HIP_CHECK(hipMalloc(&d_temp_storage, temp_storage_size_bytes));

    // Run
    HIP_CHECK(
        rocprim::partition(
            d_temp_storage,
            temp_storage_size_bytes,
            rocprim::make_constant_iterator<T>(T(345)),
            d_checking_output,
            d_selected_count_output,
            0,
            select_op,
            stream,
            debug_synchronous
        )
    );
    HIP_CHECK(hipDeviceSynchronize());

    ASSERT_FALSE(out_of_bounds.get());

    // Check if number of selected value is 0
    HIP_CHECK(
        hipMemcpy(
            &selected_count_output, d_selected_count_output,
            sizeof(unsigned int),
            hipMemcpyDeviceToHost
        )
    );
    ASSERT_EQ(selected_count_output, 0);

    hipFree(d_output);
    hipFree(d_selected_count_output);
    hipFree(d_temp_storage);
}

TYPED_TEST(RocprimDevicePartitionTests, Predicate)
{
    using O = typename TestFixture::input_type;
    using T = typename std::conditional<std::is_same<O, rocprim::half>::value, int, O>::type;//typename TestFixture::input_type;
    using U = typename TestFixture::output_type;
    static constexpr bool use_identity_iterator = TestFixture::use_identity_iterator;
    const bool debug_synchronous = TestFixture::debug_synchronous;

    hipStream_t stream = 0; // default stream

    auto select_op = [] __host__ __device__ (const T& value) -> bool
    {
        if(value == T(50)) return true;
        return false;
    };

    const std::vector<size_t> sizes = get_sizes();
    for(auto size : sizes)
    {
        SCOPED_TRACE(testing::Message() << "with size = " << size);

        // Generate data
        std::vector<T> input = test_utils::get_random_data<T>(size, 1, 100);

        T * d_input;
        U * d_output;
        unsigned int * d_selected_count_output;
        HIP_CHECK(hipMalloc(&d_input, input.size() * sizeof(T)));
        HIP_CHECK(hipMalloc(&d_output, input.size() * sizeof(U)));
        HIP_CHECK(hipMalloc(&d_selected_count_output, sizeof(unsigned int)));
        HIP_CHECK(
            hipMemcpy(
                d_input, input.data(),
                input.size() * sizeof(T),
                hipMemcpyHostToDevice
            )
        );
        HIP_CHECK(hipDeviceSynchronize());

        // Calculate expected_selected and expected_rejected results on host
        std::vector<U> expected_selected;
        std::vector<U> expected_rejected;
        expected_selected.reserve(input.size()/2);
        expected_rejected.reserve(input.size()/2);
        for(size_t i = 0; i < input.size(); i++)
        {
            if(select_op(input[i]))
            {
                expected_selected.push_back(input[i]);
            }
            else
            {
                expected_rejected.push_back(input[i]);
            }
        }
        std::reverse(expected_rejected.begin(), expected_rejected.end());

        // temp storage
        size_t temp_storage_size_bytes;
        // Get size of d_temp_storage
        HIP_CHECK(
            rocprim::partition(
                nullptr,
                temp_storage_size_bytes,
                d_input,
                test_utils::wrap_in_identity_iterator<use_identity_iterator>(d_output),
                d_selected_count_output,
                input.size(),
                select_op,
                stream,
                debug_synchronous
            )
        );
        HIP_CHECK(hipDeviceSynchronize());

        // temp_storage_size_bytes must be >0
        ASSERT_GT(temp_storage_size_bytes, 0);

        // allocate temporary storage
        void * d_temp_storage = nullptr;
        HIP_CHECK(hipMalloc(&d_temp_storage, temp_storage_size_bytes));
        HIP_CHECK(hipDeviceSynchronize());

        // Run
        HIP_CHECK(
            rocprim::partition(
                d_temp_storage,
                temp_storage_size_bytes,
                d_input,
                test_utils::wrap_in_identity_iterator<use_identity_iterator>(d_output),
                d_selected_count_output,
                input.size(),
                select_op,
                stream,
                debug_synchronous
            )
        );
        HIP_CHECK(hipDeviceSynchronize());

        // Check if number of selected value is as expected_selected
        unsigned int selected_count_output = 0;
        HIP_CHECK(
            hipMemcpy(
                &selected_count_output, d_selected_count_output,
                sizeof(unsigned int),
                hipMemcpyDeviceToHost
            )
        );
        HIP_CHECK(hipDeviceSynchronize());
        ASSERT_EQ(selected_count_output, expected_selected.size());

        // Check if output values are as expected_selected
        std::vector<U> output(input.size());
        HIP_CHECK(
            hipMemcpy(
                output.data(), d_output,
                output.size() * sizeof(U),
                hipMemcpyDeviceToHost
            )
        );
        HIP_CHECK(hipDeviceSynchronize());

        std::vector<U> output_rejected;
        for(size_t i = 0; i < expected_rejected.size(); i++)
        {
            auto j = i + expected_selected.size();
            output_rejected.push_back(output[j]);
        }
        ASSERT_NO_FATAL_FAILURE(test_utils::custom_assert_eq(output, expected_selected, expected_selected.size()));
        ASSERT_NO_FATAL_FAILURE(test_utils::custom_assert_eq(output_rejected, expected_rejected, expected_rejected.size()));

        hipFree(d_input);
        hipFree(d_output);
        hipFree(d_selected_count_output);
        hipFree(d_temp_storage);
    }
}