// MIT License
//
// Copyright (c) 2022-2023 Advanced Micro Devices, Inc. All rights reserved.
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "../common_test_header.hpp"
#include "test_utils.hpp"

#include <rocprim/warp/warp_store.hpp>

template<
    class T,
    unsigned int ItemsPerThread,
    unsigned int WarpSize,
    ::rocprim::warp_store_method Method
>
struct Params
{
    using type = T;
    static constexpr unsigned int items_per_thread = ItemsPerThread;
    static constexpr unsigned int warp_size = WarpSize;
    static constexpr ::rocprim::warp_store_method method = Method;
};

template<class Params>
class WarpStoreTest : public ::testing::Test
{
public:
    using params = Params;
};

using WarpStoreTestParams = ::testing::Types<
    Params<int, 4U, 1U, ::rocprim::warp_store_method::warp_store_direct>,
    Params<int, 4U, 1U, ::rocprim::warp_store_method::warp_store_striped>,
    Params<int, 4U, 1U, ::rocprim::warp_store_method::warp_store_vectorize>,
    Params<int, 4U, 1U, ::rocprim::warp_store_method::warp_store_transpose>,

    Params<int, 4U, 8U, ::rocprim::warp_store_method::warp_store_direct>,
    Params<int, 4U, 8U, ::rocprim::warp_store_method::warp_store_striped>,
    Params<int, 4U, 8U, ::rocprim::warp_store_method::warp_store_vectorize>,
    Params<int, 4U, 8U, ::rocprim::warp_store_method::warp_store_transpose>,

    Params<int, 4U, 32U, ::rocprim::warp_store_method::warp_store_direct>,
    Params<int, 4U, 32U, ::rocprim::warp_store_method::warp_store_striped>,
    Params<int, 4U, 32U, ::rocprim::warp_store_method::warp_store_vectorize>,
    Params<int, 4U, 32U, ::rocprim::warp_store_method::warp_store_transpose>,

    Params<int, 5U, 32U, ::rocprim::warp_store_method::warp_store_direct>,
    Params<int, 5U, 32U, ::rocprim::warp_store_method::warp_store_striped>,
    Params<int, 5U, 32U, ::rocprim::warp_store_method::warp_store_vectorize>,
    Params<int, 5U, 32U, ::rocprim::warp_store_method::warp_store_transpose>,

    Params<int, 4U, 64U, ::rocprim::warp_store_method::warp_store_direct>,
    Params<int, 4U, 64U, ::rocprim::warp_store_method::warp_store_striped>,
    Params<int, 4U, 64U, ::rocprim::warp_store_method::warp_store_vectorize>,
    Params<int, 4U, 64U, ::rocprim::warp_store_method::warp_store_transpose>,

    Params<float2, 4U, 32U, ::rocprim::warp_store_method::warp_store_direct>,
    Params<float2, 4U, 32U, ::rocprim::warp_store_method::warp_store_striped>,
    Params<float2, 4U, 32U, ::rocprim::warp_store_method::warp_store_vectorize>,
    Params<float2, 4U, 32U, ::rocprim::warp_store_method::warp_store_transpose>
>;

template<
    class T,
    unsigned int BlockSize,
    unsigned int ItemsPerThread,
    unsigned int LogicalWarpSize,
    ::rocprim::warp_store_method Method
>
__global__
__launch_bounds__(BlockSize)
void warp_store_kernel(T* d_input,
                       T* d_output)
{
    using warp_store_type = ::rocprim::warp_store<
        T,
        ItemsPerThread,
        test_utils::DeviceSelectWarpSize<LogicalWarpSize>::value,
        Method
    >;
    constexpr unsigned int tile_size = ItemsPerThread * LogicalWarpSize;
    constexpr unsigned int num_warps = BlockSize / LogicalWarpSize;
    const unsigned int warp_id = hipThreadIdx_x / LogicalWarpSize;

    ROCPRIM_SHARED_MEMORY typename warp_store_type::storage_type storage[num_warps];
    T thread_data[ItemsPerThread];
    for(unsigned int i = 0; i < ItemsPerThread; ++i)
    {
        thread_data[i] = d_input[hipThreadIdx_x * ItemsPerThread + i];
    }

    warp_store_type().store(d_output + warp_id * tile_size, thread_data, storage[warp_id]);
}

template<
    class T,
    unsigned int BlockSize,
    unsigned int ItemsPerThread,
    unsigned int LogicalWarpSize,
    ::rocprim::warp_store_method Method
>
__global__
__launch_bounds__(BlockSize)
void warp_store_guarded_kernel(T* d_input,
                               T* d_output,
                               int valid_items)
{
    using warp_store_type = ::rocprim::warp_store<
        T,
        ItemsPerThread,
        test_utils::DeviceSelectWarpSize<LogicalWarpSize>::value,
        Method
    >;
    constexpr unsigned int tile_size = ItemsPerThread * LogicalWarpSize;
    constexpr unsigned int num_warps = BlockSize / LogicalWarpSize;
    const unsigned int warp_id = hipThreadIdx_x / LogicalWarpSize;

    ROCPRIM_SHARED_MEMORY typename warp_store_type::storage_type storage[num_warps];
    T thread_data[ItemsPerThread];
    for(unsigned int i = 0; i < ItemsPerThread; ++i)
    {
        thread_data[i] = d_input[hipThreadIdx_x * ItemsPerThread + i];
    }

    warp_store_type().store(d_output + warp_id * tile_size,
                            thread_data,
                            valid_items,
                            storage[warp_id]
    );
}

template<class T>
std::vector<T> stripe_vector(const std::vector<T>& v,
                             const size_t warp_size,
                             const size_t items_per_thread)
{
    const size_t period = warp_size * items_per_thread;
    std::vector<T> striped(v.size());
    for(size_t i = 0; i < v.size(); ++i)
    {
        const size_t i_base = i % period;
        const size_t other_idx_base = ((items_per_thread * i_base) % period) + i_base / warp_size;
        const size_t other_idx = other_idx_base + period * (i / period);
        striped[i] = v[other_idx];
    }
    return striped;
}

TYPED_TEST_SUITE(WarpStoreTest, WarpStoreTestParams);

TYPED_TEST(WarpStoreTest, WarpLoad)
{
    using T = typename TestFixture::params::type;
    constexpr unsigned int warp_size = TestFixture::params::warp_size;
    constexpr ::rocprim::warp_store_method method = TestFixture::params::method;
    constexpr unsigned int items_per_thread = TestFixture::params::items_per_thread;
    constexpr unsigned int block_size = 1024;
    constexpr unsigned int items_count = items_per_thread * block_size;

    int device_id = test_common_utils::obtain_device_from_ctest();
    SKIP_IF_UNSUPPORTED_WARP_SIZE(warp_size, device_id);

    std::vector<T> input(items_count);
    std::iota(input.begin(), input.end(), static_cast<T>(0));

    T* d_input{};
    HIP_CHECK(hipMalloc(&d_input, items_count * sizeof(T)));
    HIP_CHECK(hipMemcpy(d_input, input.data(), items_count * sizeof(T), hipMemcpyHostToDevice));
    T* d_output{};
    HIP_CHECK(hipMalloc(&d_output, items_count * sizeof(T)));

    hipLaunchKernelGGL(
        HIP_KERNEL_NAME(
            warp_store_kernel<
                T,
                block_size,
                items_per_thread,
                warp_size,
                method
            >
        ),
        dim3(1), dim3(block_size), 0, 0,
        d_input, d_output
    );
    HIP_CHECK(hipGetLastError());
    HIP_CHECK(hipDeviceSynchronize());

    std::vector<T> output(items_count);
    HIP_CHECK(hipMemcpy(output.data(), d_output, items_count * sizeof(T), hipMemcpyDeviceToHost));

    HIP_CHECK(hipFree(d_input));
    HIP_CHECK(hipFree(d_output));

    auto expected = input;
    if(method == ::rocprim::warp_store_method::warp_store_striped)
    {
        expected = stripe_vector(input, warp_size, items_per_thread);
    }
    
    ASSERT_EQ(expected, output);
}

TYPED_TEST(WarpStoreTest, WarpStoreGuarded)
{
    using T = typename TestFixture::params::type;
    constexpr unsigned warp_size = TestFixture::params::warp_size;
    constexpr ::rocprim::warp_store_method method = TestFixture::params::method;
    constexpr unsigned items_per_thread = 4;
    constexpr unsigned block_size = 1024;
    constexpr unsigned items_count = items_per_thread * block_size;
    constexpr int valid_items = warp_size / 4;

    int device_id = test_common_utils::obtain_device_from_ctest();
    SKIP_IF_UNSUPPORTED_WARP_SIZE(warp_size, device_id);

    std::vector<T> input(items_count);
    std::iota(input.begin(), input.end(), static_cast<T>(0));

    T* d_input{};
    HIP_CHECK(hipMalloc(&d_input, items_count * sizeof(T)));
    HIP_CHECK(hipMemcpy(d_input, input.data(), items_count * sizeof(T), hipMemcpyHostToDevice));
    T* d_output{};
    HIP_CHECK(hipMalloc(&d_output, items_count * sizeof(T)));
    HIP_CHECK(hipMemset(d_output, 0, items_count * sizeof(T)));

    hipLaunchKernelGGL(
        HIP_KERNEL_NAME(
            warp_store_guarded_kernel<
                T,
                block_size,
                items_per_thread,
                warp_size,
                method
            >
        ),
        dim3(1), dim3(block_size), 0, 0,
        d_input, d_output, valid_items
    );
    HIP_CHECK(hipGetLastError());
    HIP_CHECK(hipDeviceSynchronize());

    std::vector<T> output(items_count);
    HIP_CHECK(hipMemcpy(output.data(), d_output, items_count * sizeof(T), hipMemcpyDeviceToHost));

    HIP_CHECK(hipFree(d_input));
    HIP_CHECK(hipFree(d_output));

    auto expected = input;
    if(method == ::rocprim::warp_store_method::warp_store_striped)
    {
        expected = stripe_vector(expected, warp_size, items_per_thread);
    }
    for(size_t warp_idx = 0; warp_idx < block_size / warp_size; ++warp_idx)
    {
        auto segment_begin = std::next(expected.begin(), warp_idx * warp_size * items_per_thread);
        auto segment_end = std::next(expected.begin(), (warp_idx + 1) * warp_size * items_per_thread);
        std::fill(std::next(segment_begin, valid_items), segment_end, static_cast<T>(0));
    }

    ASSERT_EQ(expected, output);
}
