// 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.

#include <dirent.h>
#include <include/utility.h>
#include <iostream>
#include <ostream>
#include <sys/stat.h>
#include <sys/types.h>
#include <vector>

namespace PaddleOCR {

std::vector<std::string> Utility::ReadDict(const std::string &path) {
  std::ifstream in(path);
  std::string line;
  std::vector<std::string> m_vec;
  if (in) {
    while (getline(in, line)) {
      m_vec.push_back(line);
    }
  } else {
    std::cout << "no such label file: " << path << ", exit the program..."
              << std::endl;
    exit(1);
  }
  return m_vec;
}

void Utility::VisualizeBboxes(
    const cv::Mat &srcimg,
    const std::vector<std::vector<std::vector<int>>> &boxes) {
  cv::Mat img_vis;
  srcimg.copyTo(img_vis);
  for (int n = 0; n < boxes.size(); n++) {
    cv::Point rook_points[4];
    for (int m = 0; m < boxes[n].size(); m++) {
      rook_points[m] = cv::Point(int(boxes[n][m][0]), int(boxes[n][m][1]));
    }

    const cv::Point *ppt[1] = {rook_points};
    int npt[] = {4};
    cv::polylines(img_vis, ppt, npt, 1, 1, CV_RGB(0, 255, 0), 2, 8, 0);
  }

  cv::imwrite("./ocr_vis.png", img_vis);
  std::cout << "The detection visualized image saved in ./ocr_vis.png"
            << std::endl;
}

// list all files under a directory
void Utility::GetAllFiles(const char *dir_name,
                          std::vector<std::string> &all_inputs) {
  if (NULL == dir_name) {
    std::cout << " dir_name is null ! " << std::endl;
    return;
  }
  struct stat s;
  lstat(dir_name, &s);
  if (!S_ISDIR(s.st_mode)) {
    std::cout << "dir_name is not a valid directory !" << std::endl;
    all_inputs.push_back(dir_name);
    return;
  } else {
    struct dirent *filename; // return value for readdir()
    DIR *dir;                // return value for opendir()
    dir = opendir(dir_name);
    if (NULL == dir) {
      std::cout << "Can not open dir " << dir_name << std::endl;
      return;
    }
    std::cout << "Successfully opened the dir !" << std::endl;
    while ((filename = readdir(dir)) != NULL) {
      if (strcmp(filename->d_name, ".") == 0 ||
          strcmp(filename->d_name, "..") == 0)
        continue;
      // img_dir + std::string("/") + all_inputs[0];
      all_inputs.push_back(dir_name + std::string("/") +
                           std::string(filename->d_name));
    }
  }
}

cv::Mat Utility::GetRotateCropImage(const cv::Mat &srcimage,
                            std::vector<std::vector<int>> box) {
  cv::Mat image;
  srcimage.copyTo(image);
  std::vector<std::vector<int>> points = box;

  int x_collect[4] = {box[0][0], box[1][0], box[2][0], box[3][0]};
  int y_collect[4] = {box[0][1], box[1][1], box[2][1], box[3][1]};
  int left = int(*std::min_element(x_collect, x_collect + 4));
  int right = int(*std::max_element(x_collect, x_collect + 4));
  int top = int(*std::min_element(y_collect, y_collect + 4));
  int bottom = int(*std::max_element(y_collect, y_collect + 4));

  cv::Mat img_crop;
  image(cv::Rect(left, top, right - left, bottom - top)).copyTo(img_crop);

  for (int i = 0; i < points.size(); i++) {
    points[i][0] -= left;
    points[i][1] -= top;
  }

  int img_crop_width = int(sqrt(pow(points[0][0] - points[1][0], 2) +
                                pow(points[0][1] - points[1][1], 2)));
  int img_crop_height = int(sqrt(pow(points[0][0] - points[3][0], 2) +
                                 pow(points[0][1] - points[3][1], 2)));

  cv::Point2f pts_std[4];
  pts_std[0] = cv::Point2f(0., 0.);
  pts_std[1] = cv::Point2f(img_crop_width, 0.);
  pts_std[2] = cv::Point2f(img_crop_width, img_crop_height);
  pts_std[3] = cv::Point2f(0.f, img_crop_height);

  cv::Point2f pointsf[4];
  pointsf[0] = cv::Point2f(points[0][0], points[0][1]);
  pointsf[1] = cv::Point2f(points[1][0], points[1][1]);
  pointsf[2] = cv::Point2f(points[2][0], points[2][1]);
  pointsf[3] = cv::Point2f(points[3][0], points[3][1]);

  cv::Mat M = cv::getPerspectiveTransform(pointsf, pts_std);

  cv::Mat dst_img;
  cv::warpPerspective(img_crop, dst_img, M,
                      cv::Size(img_crop_width, img_crop_height),
                      cv::BORDER_REPLICATE);

  if (float(dst_img.rows) >= float(dst_img.cols) * 1.5) {
    cv::Mat srcCopy = cv::Mat(dst_img.rows, dst_img.cols, dst_img.depth());
    cv::transpose(dst_img, srcCopy);
    cv::flip(srcCopy, srcCopy, 0);
    return srcCopy;
  } else {
    return dst_img;
  }
}

std::vector<int> Utility::argsort(const std::vector<float>& array)
{
    const int array_len(array.size());
    std::vector<int> array_index(array_len, 0);
    for (int i = 0; i < array_len; ++i)
        array_index[i] = i;

    std::sort(array_index.begin(), array_index.end(),
        [&array](int pos1, int pos2) {return (array[pos1] < array[pos2]); });

    return array_index;
}

} // namespace PaddleOCR