// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.  //NOLINT
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// 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.

#pragma once

#include "ultra_infer/ultra_infer_model.h"
#include "ultra_infer/vision/common/processors/transform.h"
#include "ultra_infer/vision/common/result.h"

namespace ultra_infer {

namespace vision {

namespace detection {
/*! @brief YOLOv6 model object used when to load a YOLOv6 model exported by
 * YOLOv6.
 */
class ULTRAINFER_DECL YOLOv6 : public UltraInferModel {
public:
  /** \brief  Set path of model file and the configuration of runtime.
   *
   * \param[in] model_file Path of model file, e.g ./yolov6.onnx
   * \param[in] params_file Path of parameter file, e.g ppyoloe/model.pdiparams,
   * if the model format is ONNX, this parameter will be ignored \param[in]
   * custom_option RuntimeOption for inference, the default will use cpu, and
   * choose the backend defined in "valid_cpu_backends" \param[in] model_format
   * Model format of the loaded model, default is ONNX format
   */
  YOLOv6(const std::string &model_file, const std::string &params_file = "",
         const RuntimeOption &custom_option = RuntimeOption(),
         const ModelFormat &model_format = ModelFormat::ONNX);

  ~YOLOv6();

  std::string ModelName() const { return "YOLOv6"; }
  /** \brief Predict the detection result for an input image
   *
   * \param[in] im The input image data, comes from cv::imread(), is a 3-D array
   * with layout HWC, BGR format \param[in] result The output detection result
   * will be written to this structure \param[in] conf_threshold confidence
   * threshold for postprocessing, default is 0.25 \param[in] nms_iou_threshold
   * iou threshold for NMS, default is 0.5 \return true if the prediction
   * succeeded, otherwise false
   */
  virtual bool Predict(cv::Mat *im, DetectionResult *result,
                       float conf_threshold = 0.25,
                       float nms_iou_threshold = 0.5);

  void UseCudaPreprocessing(int max_img_size = 3840 * 2160);

  /*! @brief
  Argument for image preprocessing step, tuple of (width, height), decide the
  target size after resize, default size = {640, 640};
  */
  std::vector<int> size;
  // padding value, size should be the same as channels

  std::vector<float> padding_value;
  // only pad to the minimum rectangle which height and width is times of stride
  bool is_mini_pad;
  // while is_mini_pad = false and is_no_pad = true,
  // will resize the image to the set size
  bool is_no_pad;
  // if is_scale_up is false, the input image only can be zoom out,
  // the maximum resize scale cannot exceed 1.0
  bool is_scale_up;
  // padding stride, for is_mini_pad
  int stride;
  // for offsetting the boxes by classes when using NMS,
  // default 4096 in meituan/YOLOv6
  float max_wh;

private:
  bool Initialize();

  bool Preprocess(Mat *mat, FDTensor *outputs,
                  std::map<std::string, std::array<float, 2>> *im_info);

  bool CudaPreprocess(Mat *mat, FDTensor *output,
                      std::map<std::string, std::array<float, 2>> *im_info);

  bool Postprocess(FDTensor &infer_result, DetectionResult *result,
                   const std::map<std::string, std::array<float, 2>> &im_info,
                   float conf_threshold, float nms_iou_threshold);

  bool IsDynamicInput() const { return is_dynamic_input_; }

  void LetterBox(Mat *mat, std::vector<int> size, std::vector<float> color,
                 bool _auto, bool scale_fill = false, bool scale_up = true,
                 int stride = 32);

  // whether to inference with dynamic shape (e.g ONNX export with dynamic shape
  // or not.)
  // meituan/YOLOv6 official 'export_onnx.py' script will export static ONNX by
  // default.
  // while is_dynamic_input if 'false', is_mini_pad will force 'false'. This
  // value will
  // auto check by ultra_infer after the internal Runtime already initialized.
  bool is_dynamic_input_;
  // CUDA host buffer for input image
  uint8_t *input_img_cuda_buffer_host_ = nullptr;
  // CUDA device buffer for input image
  uint8_t *input_img_cuda_buffer_device_ = nullptr;
  // CUDA device buffer for TRT input tensor
  float *input_tensor_cuda_buffer_device_ = nullptr;
  // Whether to use CUDA preprocessing
  bool use_cuda_preprocessing_ = false;
  // CUDA stream
  void *cuda_stream_ = nullptr;
};

} // namespace detection
} // namespace vision
} // namespace ultra_infer