// Tencent is pleased to support the open source community by making ncnn available.
//
// Copyright (C) 2024 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 "deconvolution_riscv.h"

#if __riscv_vector
#include <riscv_vector.h>
#endif // __riscv_vector

#include "riscv_activation.h"
#include "riscv_usability.h"

namespace ncnn {

#if NCNN_ZFH
#include "deconvolution_fp16s.h"
#if __riscv_zvfh
#include "deconvolution_packn_fp16s.h"
#include "deconvolution_pack1ton_fp16s.h"
#include "deconvolution_packnto1_fp16s.h"
#endif
#endif // NCNN_ZFH

#if NCNN_ZFH
int Deconvolution_riscv::create_pipeline_fp16s(const Option& opt)
{
#if __riscv_zvfh
    const int packn = csrr_vlenb() / 2;
#endif // __riscv_zvfh

    const int maxk = kernel_w * kernel_h;
    const int num_input = weight_data_size / maxk / num_output;

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

    Mat weight_data_transposed(weight_data.w);
    {
        float* pt = weight_data_transposed;
        const float* p = weight_data;

        for (int i = 0; i < num_input * num_output; i++)
        {
            for (int k = 0; k < maxk; k++)
            {
                pt[maxk - 1 - k] = p[k];
            }

            p += maxk;
            pt += maxk;
        }
    }

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

        weight_data_tm.create(maxk, num_input / elempack, num_output / out_elempack, (size_t)2u * elempack * out_elempack, elempack * out_elempack);

        for (int q = 0; q + (out_elempack - 1) < num_output; q += out_elempack)
        {
            __fp16* g00 = weight_data_tm.channel(q / out_elempack);

            for (int p = 0; p + (elempack - 1) < num_input; p += elempack)
            {
                for (int k = 0; k < maxk; 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] = (__fp16)k00[k];

                            g00++;
                        }
                    }
                }
            }
        }
    }

#if __riscv_zvfh
    // packn
    if (elempack == packn && out_elempack == packn)
    {
    }

    // pack1ton
    if (elempack == 1 && out_elempack == packn)
    {
    }

    // packnto1
    if (elempack == packn && out_elempack == 1)
    {
    }
#endif // __riscv_zvfh

    // pack1
    if (elempack == 1 && out_elempack == 1)
    {
    }

    ncnn::cast_float32_to_float16(bias_data, bias_data_fp16, opt);

    if (opt.lightmode)
        weight_data.release();

    return 0;
}

int Deconvolution_riscv::forward_fp16s(const Mat& bottom_blob, Mat& top_blob, const Option& opt) const
{
#if __riscv_zvfh
    const int packn = csrr_vlenb() / 2;
#endif // __riscv_zvfh

    // deconvolv with NxN kernel
    // value = value + bias

    int w = bottom_blob.w;
    int h = bottom_blob.h;
    int channels = bottom_blob.c;
    size_t elemsize = bottom_blob.elemsize;
    int elempack = bottom_blob.elempack;

    //     NCNN_LOGE("Deconvolution input %d x %d  pad = %d %d  ksize=%d %d  stride=%d %d", w, h, pad_w, pad_h, kernel_w, kernel_h, stride_w, stride_h);

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

    int outw = (w - 1) * stride_w + kernel_extent_w + output_pad_right;
    int outh = (h - 1) * stride_h + kernel_extent_h + output_pad_bottom;
    int out_elempack = 1;
#if __riscv_zvfh
    if (opt.use_packing_layout)
    {
        out_elempack = num_output % packn == 0 ? packn : 1;
    }
#endif // __riscv_zvfh
    size_t out_elemsize = elemsize / elempack * out_elempack;

    Mat top_blob_bordered;
    if (pad_left > 0 || pad_right > 0 || pad_top > 0 || pad_bottom > 0 || (output_w > 0 && output_h > 0))
    {
        top_blob_bordered.create(outw, outh, num_output / out_elempack, out_elemsize, out_elempack, opt.workspace_allocator);
    }
    else
    {
        top_blob_bordered = top_blob;
        top_blob_bordered.create(outw, outh, num_output / out_elempack, out_elemsize, out_elempack, opt.blob_allocator);
    }
    if (top_blob_bordered.empty())
        return -100;

#if __riscv_zvfh
    if (elempack == packn && out_elempack == packn)
    {
        {
            deconvolution_packn_fp16s_rvv(bottom_blob, top_blob_bordered, weight_data_tm, bias_data, kernel_w, kernel_h, dilation_w, dilation_h, stride_w, stride_h, activation_type, activation_params, opt);
        }
    }

    if (elempack == 1 && out_elempack == packn)
    {
        {
            deconvolution_pack1ton_fp16s_rvv(bottom_blob, top_blob_bordered, weight_data_tm, bias_data, kernel_w, kernel_h, dilation_w, dilation_h, stride_w, stride_h, activation_type, activation_params, opt);
        }
    }

    if (elempack == packn && out_elempack == 1)
    {
        {
            deconvolution_packnto1_fp16s_rvv(bottom_blob, top_blob_bordered, weight_data_tm, bias_data, kernel_w, kernel_h, dilation_w, dilation_h, stride_w, stride_h, activation_type, activation_params, opt);
        }
    }
#endif // __riscv_zvfh

    if (elempack == 1 && out_elempack == 1)
    {
        {
            deconvolution_fp16s(bottom_blob, top_blob_bordered, weight_data_tm, bias_data, kernel_w, kernel_h, dilation_w, dilation_h, stride_w, stride_h, activation_type, activation_params, opt);
        }
    }

    cut_padding(top_blob_bordered, top_blob, opt);
    if (top_blob.empty())
        return -100;

    return 0;
}

int Deconvolution_riscv::forward_fp16sa(const Mat& bottom_blob, Mat& top_blob, const Option& opt) const
{
#if __riscv_zvfh
    const int packn = csrr_vlenb() / 2;
#endif // __riscv_zvfh

    // deconvolv with NxN kernel
    // value = value + bias

    int w = bottom_blob.w;
    int h = bottom_blob.h;
    int channels = bottom_blob.c;
    size_t elemsize = bottom_blob.elemsize;
    int elempack = bottom_blob.elempack;

    //     NCNN_LOGE("Deconvolution input %d x %d  pad = %d %d  ksize=%d %d  stride=%d %d", w, h, pad_w, pad_h, kernel_w, kernel_h, stride_w, stride_h);

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

    int outw = (w - 1) * stride_w + kernel_extent_w + output_pad_right;
    int outh = (h - 1) * stride_h + kernel_extent_h + output_pad_bottom;
    int out_elempack = 1;
#if __riscv_zvfh
    if (opt.use_packing_layout)
    {
        out_elempack = num_output % packn == 0 ? packn : 1;
    }
#endif // __riscv_zvfh
    size_t out_elemsize = elemsize / elempack * out_elempack;

    Mat top_blob_bordered;
    if (pad_left > 0 || pad_right > 0 || pad_top > 0 || pad_bottom > 0 || (output_w > 0 && output_h > 0))
    {
        top_blob_bordered.create(outw, outh, num_output / out_elempack, out_elemsize, out_elempack, opt.workspace_allocator);
    }
    else
    {
        top_blob_bordered = top_blob;
        top_blob_bordered.create(outw, outh, num_output / out_elempack, out_elemsize, out_elempack, opt.blob_allocator);
    }
    if (top_blob_bordered.empty())
        return -100;

#if __riscv_zvfh
    if (elempack == packn && out_elempack == packn)
    {
        {
            deconvolution_packn_fp16sa_rvv(bottom_blob, top_blob_bordered, weight_data_tm, bias_data_fp16, kernel_w, kernel_h, dilation_w, dilation_h, stride_w, stride_h, activation_type, activation_params, opt);
        }
    }

    if (elempack == 1 && out_elempack == packn)
    {
        {
            deconvolution_pack1ton_fp16sa_rvv(bottom_blob, top_blob_bordered, weight_data_tm, bias_data_fp16, kernel_w, kernel_h, dilation_w, dilation_h, stride_w, stride_h, activation_type, activation_params, opt);
        }
    }

    if (elempack == packn && out_elempack == 1)
    {
        {
            deconvolution_packnto1_fp16sa_rvv(bottom_blob, top_blob_bordered, weight_data_tm, bias_data_fp16, kernel_w, kernel_h, dilation_w, dilation_h, stride_w, stride_h, activation_type, activation_params, opt);
        }
    }
#endif // __riscv_zvfh

    if (elempack == 1 && out_elempack == 1)
    {
        {
            deconvolution_fp16s(bottom_blob, top_blob_bordered, weight_data_tm, bias_data, kernel_w, kernel_h, dilation_w, dilation_h, stride_w, stride_h, activation_type, activation_params, opt);
        }
    }

    cut_padding(top_blob_bordered, top_blob, opt);
    if (top_blob.empty())
        return -100;

    return 0;
}
#endif // NCNN_ZFH

} // namespace ncnn
