// Tencent is pleased to support the open source community by making ncnn available.
//
// Copyright (C) 2021 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// https://opensource.org/licenses/BSD-3-Clause
//
// 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 "convolution1d_mips.h"

#if __mips_msa
#include <msa.h>
#endif // __mips_msa

#include "mips_activation.h"
#include "mips_usability.h"

namespace ncnn {

Convolution1D_mips::Convolution1D_mips()
{
#if __mips_msa
    support_packing = true;
#endif // __mips_msa
}

int Convolution1D_mips::create_pipeline(const Option& opt)
{
    if (dynamic_weight)
        return 0;

    const int num_input = weight_data_size / kernel_w / num_output;

    int elempack = 1;
    int out_elempack = 1;
#if __mips_msa
    if (opt.use_packing_layout)
    {
        elempack = num_input % 4 == 0 ? 4 : 1;
        out_elempack = num_output % 4 == 0 ? 4 : 1;
    }
#endif

    // src = kw-inch-outch
    // dst = pb-pa-kw-inch/pa-outch/pb
    {
        Mat weight_data_r2 = weight_data.reshape(kernel_w, num_input, num_output);

        weight_data_packed.create(kernel_w, num_input / elempack, num_output / out_elempack, (size_t)4u * elempack * out_elempack, elempack * out_elempack);

        for (int q = 0; q + (out_elempack - 1) < num_output; q += out_elempack)
        {
            float* g00 = weight_data_packed.channel(q / out_elempack);

            for (int p = 0; p + (elempack - 1) < num_input; p += elempack)
            {
                for (int k = 0; k < kernel_w; k++)
                {
                    for (int i = 0; i < elempack; i++)
                    {
                        for (int j = 0; j < out_elempack; j++)
                        {
                            const float* k00 = weight_data_r2.channel(q + j).row(p + i);

                            g00[0] = k00[k];

                            g00++;
                        }
                    }
                }
            }
        }
    }

    return 0;
}

int Convolution1D_mips::destroy_pipeline(const Option& /*opt*/)
{
    return 0;
}

int Convolution1D_mips::forward(const Mat& bottom_blob, Mat& top_blob, const Option& opt) const
{
    int w = bottom_blob.w;
    int h = bottom_blob.h;
    size_t elemsize = bottom_blob.elemsize;
    int elempack = bottom_blob.elempack;

    const int kernel_extent_w = dilation_w * (kernel_w - 1) + 1;

    Mat bottom_blob_bordered;
    make_padding(bottom_blob, bottom_blob_bordered, opt);
    if (bottom_blob_bordered.empty())
        return -100;

    w = bottom_blob_bordered.w;
    h = bottom_blob_bordered.h;

    int out_elempack = 1;
#if __mips_msa
    if (opt.use_packing_layout)
    {
        out_elempack = num_output % 4 == 0 ? 4 : 1;
    }
#endif
    size_t out_elemsize = elemsize / elempack * out_elempack;

    const int outw = (w - kernel_extent_w) / stride_w + 1;
    const int outh = num_output / out_elempack;

    top_blob.create(outw, outh, out_elemsize, out_elempack, opt.blob_allocator);
    if (top_blob.empty())
        return -100;

#if __mips_msa
    if (elempack == 4 && out_elempack == 4)
    {
        {
            #pragma omp parallel for num_threads(opt.num_threads)
            for (int p = 0; p < outh; p++)
            {
                float* outptr = top_blob.row(p);

                for (int j = 0; j < outw; j++)
                {
                    v4f32 _sum = (v4f32)__msa_fill_w(0);

                    if (bias_term)
                    {
                        _sum = (v4f32)__msa_ld_w((const float*)bias_data + p * 4, 0);
                    }

                    const float* kptr = weight_data_packed.channel(p);

                    for (int q = 0; q < h; q++)
                    {
                        const float* sptr = bottom_blob_bordered.row(q) + j * stride_w * 4;

                        for (int k = 0; k < kernel_w; k++)
                        {
                            v4f32 _val0 = __msa_fill_w_f32(sptr[0]);
                            v4f32 _val1 = __msa_fill_w_f32(sptr[1]);
                            v4f32 _val2 = __msa_fill_w_f32(sptr[2]);
                            v4f32 _val3 = __msa_fill_w_f32(sptr[3]);

                            v4f32 _w0 = (v4f32)__msa_ld_w(kptr, 0);
                            v4f32 _w1 = (v4f32)__msa_ld_w(kptr + 4, 0);
                            v4f32 _w2 = (v4f32)__msa_ld_w(kptr + 8, 0);
                            v4f32 _w3 = (v4f32)__msa_ld_w(kptr + 12, 0);

                            _sum = __msa_fmadd_w(_sum, _val0, _w0);
                            _sum = __msa_fmadd_w(_sum, _val1, _w1);
                            _sum = __msa_fmadd_w(_sum, _val2, _w2);
                            _sum = __msa_fmadd_w(_sum, _val3, _w3);

                            sptr += dilation_w * 4;
                            kptr += 16;
                        }
                    }

                    _sum = activation_ps(_sum, activation_type, activation_params);

                    __msa_st_w((v4i32)_sum, outptr, 0);
                    outptr += 4;
                }
            }
        }
    }

    if (elempack == 1 && out_elempack == 4)
    {
        {
            #pragma omp parallel for num_threads(opt.num_threads)
            for (int p = 0; p < outh; p++)
            {
                float* outptr = top_blob.row(p);

                for (int j = 0; j < outw; j++)
                {
                    v4f32 _sum = (v4f32)__msa_fill_w(0);

                    if (bias_term)
                    {
                        _sum = (v4f32)__msa_ld_w((const float*)bias_data + p * 4, 0);
                    }

                    const float* kptr = weight_data_packed.channel(p);

                    for (int q = 0; q < h; q++)
                    {
                        const float* sptr = bottom_blob_bordered.row(q) + j * stride_w;

                        for (int k = 0; k < kernel_w; k++)
                        {
                            v4f32 _val = __msa_fill_w_f32(sptr[0]);
                            v4f32 _w = (v4f32)__msa_ld_w(kptr, 0);
                            _sum = __msa_fmadd_w(_sum, _val, _w);

                            sptr += dilation_w;
                            kptr += 4;
                        }
                    }

                    _sum = activation_ps(_sum, activation_type, activation_params);

                    __msa_st_w((v4i32)_sum, outptr, 0);
                    outptr += 4;
                }
            }
        }
    }

    if (elempack == 4 && out_elempack == 1)
    {
        {
            #pragma omp parallel for num_threads(opt.num_threads)
            for (int p = 0; p < outh; p++)
            {
                float* outptr = top_blob.row(p);

                for (int j = 0; j < outw; j++)
                {
                    float sum = 0.f;

                    if (bias_term)
                    {
                        sum = bias_data[p];
                    }

                    v4f32 _sum = (v4f32)__msa_fill_w(0);

                    const float* kptr = weight_data_packed.channel(p);

                    for (int q = 0; q < h; q++)
                    {
                        const float* sptr = bottom_blob_bordered.row(q) + j * stride_w * 4;

                        for (int k = 0; k < kernel_w; k++)
                        {
                            v4f32 _val = (v4f32)__msa_ld_w(sptr, 0);
                            v4f32 _w = (v4f32)__msa_ld_w(kptr, 0);
                            _sum = __msa_fmadd_w(_sum, _val, _w);

                            sptr += dilation_w * 4;
                            kptr += 4;
                        }
                    }

                    sum += __msa_reduce_fadd_w(_sum);

                    sum = activation_ss(sum, activation_type, activation_params);

                    outptr[j] = sum;
                }
            }
        }
    }
#endif // __mips_msa

    if (elempack == 1 && out_elempack == 1)
    {
        {
            #pragma omp parallel for num_threads(opt.num_threads)
            for (int p = 0; p < outh; p++)
            {
                float* outptr = top_blob.row(p);

                for (int j = 0; j < outw; j++)
                {
                    float sum = 0.f;

                    if (bias_term)
                    {
                        sum = bias_data[p];
                    }

                    const float* kptr = (const float*)weight_data + kernel_w * h * p;

                    for (int q = 0; q < h; q++)
                    {
                        const float* sptr = bottom_blob_bordered.row(q) + j * stride_w;

                        for (int k = 0; k < kernel_w; k++)
                        {
                            float val = sptr[0];
                            float wt = kptr[0];
                            sum += val * wt;

                            sptr += dilation_w;
                            kptr += 1;
                        }
                    }

                    sum = activation_ss(sum, activation_type, activation_params);

                    outptr[j] = sum;
                }
            }
        }
    }

    return 0;
}

int Convolution1D_mips::forward(const std::vector<Mat>& bottom_blobs, std::vector<Mat>& top_blobs, const Option& opt) const
{
    const Mat& bottom_blob = bottom_blobs[0];
    const Mat& _weight_data = bottom_blobs[1];
    Mat& top_blob = top_blobs[0];

    const int _kernel_w = _weight_data.w;
    const int _num_output = _weight_data.c * _weight_data.elempack;

    Mat weight_data_flattened;
    flatten(_weight_data, weight_data_flattened, opt);
    if (weight_data_flattened.empty())
        return -100;

    // weight_data_flattened as pack1
    weight_data_flattened.w *= weight_data_flattened.elempack;
    weight_data_flattened.elemsize /= weight_data_flattened.elempack;
    weight_data_flattened.elempack = 1;

    Mat bias_data_flattened;
    if (bias_term)
    {
        const Mat& _bias_data = bottom_blobs[2];
        flatten(_bias_data, bias_data_flattened, opt);
        if (bias_data_flattened.empty())
            return -100;

        // bias_data_flattened as pack1
        bias_data_flattened.w *= bias_data_flattened.elempack;
        bias_data_flattened.elemsize /= bias_data_flattened.elempack;
        bias_data_flattened.elempack = 1;
    }

    ncnn::Layer* op = ncnn::create_layer(ncnn::LayerType::Convolution1D);

    ncnn::ParamDict pd;
    pd.set(0, _num_output);
    pd.set(1, _kernel_w);
    pd.set(2, dilation_w);
    pd.set(3, stride_w);
    pd.set(4, pad_left);
    pd.set(15, pad_right);
    pd.set(18, pad_value);
    pd.set(5, bias_term);
    pd.set(6, weight_data_flattened.w);
    pd.set(9, activation_type);
    pd.set(10, activation_params);

    op->load_param(pd);

    ncnn::Mat weights[2];
    weights[0] = weight_data_flattened;
    weights[1] = bias_data_flattened;

    op->load_model(ncnn::ModelBinFromMatArray(weights));

    op->create_pipeline(opt);

    op->forward(bottom_blob, top_blob, opt);

    op->destroy_pipeline(opt);

    delete op;

    return 0;
}

} // namespace ncnn