// Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
//
// 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 <fstream>
#include <include/postprocess_op.h>
#include <include/preprocess_op.h>
#include <iostream>
#include <memory>
#include <yaml-cpp/yaml.h>

namespace paddle_infer {
class Predictor;
}

namespace PaddleOCR {

class DBDetector {
public:
  explicit DBDetector(const std::string &model_dir, const bool &use_gpu,
                      const int &gpu_id, const int &gpu_mem,
                      const int &cpu_math_library_num_threads,
                      const bool &use_mkldnn, const std::string &limit_type,
                      const int &limit_side_len, const double &det_db_thresh,
                      const double &det_db_box_thresh,
                      const double &det_db_unclip_ratio,
                      const std::string &det_db_score_mode,
                      const bool &use_dilation, const bool &use_tensorrt,
                      const std::string &precision) noexcept {
    this->use_gpu_ = use_gpu;
    this->gpu_id_ = gpu_id;
    this->gpu_mem_ = gpu_mem;
    this->cpu_math_library_num_threads_ = cpu_math_library_num_threads;
    this->use_mkldnn_ = use_mkldnn;

    this->limit_type_ = limit_type;
    this->limit_side_len_ = limit_side_len;

    this->det_db_thresh_ = det_db_thresh;
    this->det_db_box_thresh_ = det_db_box_thresh;
    this->det_db_unclip_ratio_ = det_db_unclip_ratio;
    this->det_db_score_mode_ = det_db_score_mode;
    this->use_dilation_ = use_dilation;

    this->use_tensorrt_ = use_tensorrt;
    this->precision_ = precision;

    std::string yaml_file_path = model_dir + "/inference.yml";
    std::ifstream yaml_file(yaml_file_path);
    if (yaml_file.is_open()) {
      std::string model_name;
      try {
        YAML::Node config = YAML::LoadFile(yaml_file_path);
        if (config["Global"] && config["Global"]["model_name"]) {
          model_name = config["Global"]["model_name"].as<std::string>();
        }
        if (!model_name.empty() && model_name != "PP-OCRv5_mobile_det" &&
            model_name != "PP-OCRv5_server_det") {
          std::cerr << "Error: " << model_name << " is currently not supported."
                    << std::endl;
          std::exit(EXIT_FAILURE);
        }
      } catch (const YAML::Exception &e) {
        std::cerr << "Failed to load YAML file: " << e.what() << std::endl;
      }
    }

    LoadModel(model_dir);
  }

  // Load Paddle inference model
  void LoadModel(const std::string &model_dir) noexcept;

  // Run predictor
  void Run(const cv::Mat &img,
           std::vector<std::vector<std::vector<int>>> &boxes,
           std::vector<double> &times) noexcept;

private:
  std::shared_ptr<paddle_infer::Predictor> predictor_;

  bool use_gpu_ = false;
  int gpu_id_ = 0;
  int gpu_mem_ = 4000;
  int cpu_math_library_num_threads_ = 4;
  bool use_mkldnn_ = false;

  std::string limit_type_ = "max";
  int limit_side_len_ = 960;

  double det_db_thresh_ = 0.3;
  double det_db_box_thresh_ = 0.5;
  double det_db_unclip_ratio_ = 2.0;
  std::string det_db_score_mode_ = "slow";
  bool use_dilation_ = false;

  bool visualize_ = true;
  bool use_tensorrt_ = false;
  std::string precision_ = "fp32";

  std::vector<float> mean_ = {0.485f, 0.456f, 0.406f};
  std::vector<float> scale_ = {1 / 0.229f, 1 / 0.224f, 1 / 0.225f};
  bool is_scale_ = true;

  // pre-process
  ResizeImgType0 resize_op_;
  Normalize normalize_op_;
  Permute permute_op_;

  // post-process
  DBPostProcessor post_processor_;
};

} // namespace PaddleOCR
