#include <migraphx/gpu/convolution.hpp>
#include <migraphx/gpu/context.hpp>
#include <migraphx/generate.hpp>

namespace migraphx {
inline namespace MIGRAPHX_INLINE_NS {
namespace gpu {

shape miopen_convolution::compute_shape(const std::vector<shape>& inputs) const
{
    check_shapes{inputs, *this}.has(4).standard();
    std::vector<shape> conv_inputs(inputs.begin(), inputs.begin() + 2);
    check_shapes{conv_inputs, *this}.max_ndims(5);
    return op.compute_shape(conv_inputs);
}

inline shape reshape_if_1d(const shape& input)
{
    shape new_shape{input};
    auto dims = new_shape.lens();

    if(dims.size() == 3)
    {
        std::vector<size_t> new_dims = dims;
        new_dims.insert(new_dims.begin() + 2, 1);
        new_shape = shape{input.type(), new_dims};
    }
    return new_shape;
}

argument miopen_convolution::compute(context& ctx,
                                     const shape& output_shape,
                                     const std::vector<argument>& args) const
{
    auto x_desc = make_tensor(reshape_if_1d(args[0].get_shape()));
    auto w_desc = make_tensor(reshape_if_1d(args[1].get_shape()));
    auto y_desc = make_tensor(reshape_if_1d(output_shape));

    if(solution_id == 0)
        MIGRAPHX_THROW("MIOpen Convolution: invalid solution ID");

    auto status = miopenConvolutionForwardImmediate(ctx.get_stream().get_miopen(),
                                                    w_desc.get(),
                                                    args[1].implicit(),
                                                    x_desc.get(),
                                                    args[0].implicit(),
                                                    cd.get(),
                                                    y_desc.get(),
                                                    args[3].implicit(),
                                                    args[2].implicit(),
                                                    args[2].get_shape().bytes(),
                                                    solution_id);

    if(status != miopenStatusSuccess)
        MIGRAPHX_THROW("MIOpen Convolution: running convolution failed");
    return args[3];
}

shape miopen_convolution::find(context& ctx, const shape& output_shape, std::vector<shape> inputs)
{
    shape workspace_shape{};

    auto x_desc = make_tensor(reshape_if_1d(inputs[0]));
    auto w_desc = make_tensor(reshape_if_1d(inputs[1]));
    auto y_desc = make_tensor(reshape_if_1d(output_shape));

    std::size_t workspace_size = 0;
    miopenConvolutionForwardGetWorkSpaceSize(ctx.get_stream().get_miopen(),
                                             w_desc.get(),
                                             x_desc.get(),
                                             cd.get(),
                                             y_desc.get(),
                                             &workspace_size);
    workspace_shape = shape{shape::int8_type, {workspace_size}};

    auto x         = to_gpu(generate_argument(inputs[0]));
    auto w         = to_gpu(generate_argument(inputs[1]));
    auto y         = allocate_gpu(output_shape);
    auto workspace = allocate_gpu(workspace_shape);

    int algo_count = 1;
    miopenConvAlgoPerf_t perf;
    auto status = miopenFindConvolutionForwardAlgorithm(ctx.get_stream().get_miopen(),
                                                        x_desc.get(),
                                                        x.implicit(),
                                                        w_desc.get(),
                                                        w.implicit(),
                                                        cd.get(),
                                                        y_desc.get(),
                                                        y.implicit(),
                                                        1,
                                                        &algo_count,
                                                        &perf,
                                                        workspace.implicit(),
                                                        workspace_size,
                                                        false);
    if(status != miopenStatusSuccess)
        MIGRAPHX_THROW("MIOpen Convolution: find convolution failed");
    algo = perf.fwd_algo;

    size_t solution_count;

    status = miopenConvolutionForwardGetSolutionCount(ctx.get_stream().get_miopen(),
                                                      w_desc.get(),
                                                      x_desc.get(),
                                                      cd.get(),
                                                      y_desc.get(),
                                                      &solution_count);
    if(status != miopenStatusSuccess)
        MIGRAPHX_THROW("MIOpen Convolution: get solution count failed");

    std::vector<miopenConvSolution_t> solutions(solution_count);

    status = miopenConvolutionForwardGetSolution(ctx.get_stream().get_miopen(),
                                                 w_desc.get(),
                                                 x_desc.get(),
                                                 cd.get(),
                                                 y_desc.get(),
                                                 solution_count,
                                                 &solution_count,
                                                 solutions.data());
    if(status != miopenStatusSuccess)
        MIGRAPHX_THROW("MIOpen Convolution: get solution failed");

    solution_id = solutions.front().solution_id;

    return shape{shape::int8_type, {perf.memory}};
}

void miopen_convolution::finalize(context& ctx,
                                  const shape& output_shape,
                                  std::vector<shape> inputs)
{
    if(cd == nullptr)
        cd = make_conv(op);
    if(solution_id == 0)
    {
        // Check that workspace hasn't changed
        auto size = inputs.at(2).bytes();
        auto ws   = find(ctx, output_shape, inputs);
        if(ws.bytes() > size)
            MIGRAPHX_THROW("MIOpen Convolution: workspace has changed during finalization.");
    }

    auto x_desc = make_tensor(reshape_if_1d(inputs[0]));
    auto w_desc = make_tensor(reshape_if_1d(inputs[1]));
    auto y_desc = make_tensor(reshape_if_1d(output_shape));

    auto status = miopenConvolutionForwardCompileSolution(ctx.get_stream().get_miopen(),
                                                          w_desc.get(),
                                                          x_desc.get(),
                                                          cd.get(),
                                                          y_desc.get(),
                                                          solution_id);
    if(status != miopenStatusSuccess)
        MIGRAPHX_THROW("MIOpen Convolution: compile solution failed");
}

} // namespace gpu
} // namespace MIGRAPHX_INLINE_NS
} // namespace migraphx