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#pragma once

#include <pcl/2d/convolution.h>
#include <pcl/2d/edge.h>
#include <pcl/common/angles.h> // for rad2deg

namespace pcl {

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::detectEdgeSobel(pcl::PointCloud<PointOutT>& output)
{
  convolution_.setInputCloud(input_);
  pcl::PointCloud<PointXYZI>::Ptr kernel_x(new pcl::PointCloud<PointXYZI>);
  pcl::PointCloud<PointXYZI>::Ptr magnitude_x(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelType(kernel<PointXYZI>::SOBEL_X);
  kernel_.fetchKernel(*kernel_x);
  convolution_.setKernel(*kernel_x);
  convolution_.filter(*magnitude_x);

  pcl::PointCloud<PointXYZI>::Ptr kernel_y(new pcl::PointCloud<PointXYZI>);
  pcl::PointCloud<PointXYZI>::Ptr magnitude_y(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelType(kernel<PointXYZI>::SOBEL_Y);
  kernel_.fetchKernel(*kernel_y);
  convolution_.setKernel(*kernel_y);
  convolution_.filter(*magnitude_y);

  const int height = input_->height;
  const int width = input_->width;

  output.resize(height * width);
  output.height = height;
  output.width = width;

  for (std::size_t i = 0; i < output.size(); ++i) {
    output[i].magnitude_x = (*magnitude_x)[i].intensity;
    output[i].magnitude_y = (*magnitude_y)[i].intensity;
    output[i].magnitude =
        std::sqrt((*magnitude_x)[i].intensity * (*magnitude_x)[i].intensity +
                  (*magnitude_y)[i].intensity * (*magnitude_y)[i].intensity);
    output[i].direction =
        std::atan2((*magnitude_y)[i].intensity, (*magnitude_x)[i].intensity);
  }
}

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::sobelMagnitudeDirection(
    const pcl::PointCloud<PointInT>& input_x,
    const pcl::PointCloud<PointInT>& input_y,
    pcl::PointCloud<PointOutT>& output)
{
  convolution_.setInputCloud(input_x.makeShared());
  pcl::PointCloud<PointXYZI>::Ptr kernel_x(new pcl::PointCloud<PointXYZI>);
  pcl::PointCloud<PointXYZI>::Ptr magnitude_x(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelType(kernel<PointXYZI>::SOBEL_X);
  kernel_.fetchKernel(*kernel_x);
  convolution_.setKernel(*kernel_x);
  convolution_.filter(*magnitude_x);

  convolution_.setInputCloud(input_y.makeShared());
  pcl::PointCloud<PointXYZI>::Ptr kernel_y(new pcl::PointCloud<PointXYZI>);
  pcl::PointCloud<PointXYZI>::Ptr magnitude_y(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelType(kernel<PointXYZI>::SOBEL_Y);
  kernel_.fetchKernel(*kernel_y);
  convolution_.setKernel(*kernel_y);
  convolution_.filter(*magnitude_y);

  const int height = input_x.height;
  const int width = input_x.width;

  output.resize(height * width);
  output.height = height;
  output.width = width;

  for (std::size_t i = 0; i < output.size(); ++i) {
    output[i].magnitude_x = (*magnitude_x)[i].intensity;
    output[i].magnitude_y = (*magnitude_y)[i].intensity;
    output[i].magnitude =
        std::sqrt((*magnitude_x)[i].intensity * (*magnitude_x)[i].intensity +
                  (*magnitude_y)[i].intensity * (*magnitude_y)[i].intensity);
    output[i].direction =
        std::atan2((*magnitude_y)[i].intensity, (*magnitude_x)[i].intensity);
  }
}

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::detectEdgePrewitt(pcl::PointCloud<PointOutT>& output)
{
  convolution_.setInputCloud(input_);

  pcl::PointCloud<PointXYZI>::Ptr kernel_x(new pcl::PointCloud<PointXYZI>);
  pcl::PointCloud<PointXYZI>::Ptr magnitude_x(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelType(kernel<PointXYZI>::PREWITT_X);
  kernel_.fetchKernel(*kernel_x);
  convolution_.setKernel(*kernel_x);
  convolution_.filter(*magnitude_x);

  pcl::PointCloud<PointXYZI>::Ptr kernel_y(new pcl::PointCloud<PointXYZI>);
  pcl::PointCloud<PointXYZI>::Ptr magnitude_y(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelType(kernel<PointXYZI>::PREWITT_Y);
  kernel_.fetchKernel(*kernel_y);
  convolution_.setKernel(*kernel_y);
  convolution_.filter(*magnitude_y);

  const int height = input_->height;
  const int width = input_->width;

  output.resize(height * width);
  output.height = height;
  output.width = width;

  for (std::size_t i = 0; i < output.size(); ++i) {
    output[i].magnitude_x = (*magnitude_x)[i].intensity;
    output[i].magnitude_y = (*magnitude_y)[i].intensity;
    output[i].magnitude =
        std::sqrt((*magnitude_x)[i].intensity * (*magnitude_x)[i].intensity +
                  (*magnitude_y)[i].intensity * (*magnitude_y)[i].intensity);
    output[i].direction =
        std::atan2((*magnitude_y)[i].intensity, (*magnitude_x)[i].intensity);
  }
}

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::detectEdgeRoberts(pcl::PointCloud<PointOutT>& output)
{
  convolution_.setInputCloud(input_);

  pcl::PointCloud<PointXYZI>::Ptr kernel_x(new pcl::PointCloud<PointXYZI>);
  pcl::PointCloud<PointXYZI>::Ptr magnitude_x(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelType(kernel<PointXYZI>::ROBERTS_X);
  kernel_.fetchKernel(*kernel_x);
  convolution_.setKernel(*kernel_x);
  convolution_.filter(*magnitude_x);

  pcl::PointCloud<PointXYZI>::Ptr kernel_y(new pcl::PointCloud<PointXYZI>);
  pcl::PointCloud<PointXYZI>::Ptr magnitude_y(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelType(kernel<PointXYZI>::ROBERTS_Y);
  kernel_.fetchKernel(*kernel_y);
  convolution_.setKernel(*kernel_y);
  convolution_.filter(*magnitude_y);

  const int height = input_->height;
  const int width = input_->width;

  output.resize(height * width);
  output.height = height;
  output.width = width;

  for (std::size_t i = 0; i < output.size(); ++i) {
    output[i].magnitude_x = (*magnitude_x)[i].intensity;
    output[i].magnitude_y = (*magnitude_y)[i].intensity;
    output[i].magnitude =
        std::sqrt((*magnitude_x)[i].intensity * (*magnitude_x)[i].intensity +
                  (*magnitude_y)[i].intensity * (*magnitude_y)[i].intensity);
    output[i].direction =
        std::atan2((*magnitude_y)[i].intensity, (*magnitude_x)[i].intensity);
  }
}

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::cannyTraceEdge(
    int rowOffset, int colOffset, int row, int col, pcl::PointCloud<PointXYZI>& maxima)
{
  int newRow = row + rowOffset;
  int newCol = col + colOffset;
  PointXYZI& pt = maxima(newCol, newRow);

  if (newRow > 0 && newRow < static_cast<int>(maxima.height) && newCol > 0 &&
      newCol < static_cast<int>(maxima.width)) {
    if (pt.intensity == 0.0f || pt.intensity == std::numeric_limits<float>::max())
      return;

    pt.intensity = std::numeric_limits<float>::max();
    cannyTraceEdge(1, 0, newRow, newCol, maxima);
    cannyTraceEdge(-1, 0, newRow, newCol, maxima);
    cannyTraceEdge(1, 1, newRow, newCol, maxima);
    cannyTraceEdge(-1, -1, newRow, newCol, maxima);
    cannyTraceEdge(0, -1, newRow, newCol, maxima);
    cannyTraceEdge(0, 1, newRow, newCol, maxima);
    cannyTraceEdge(-1, 1, newRow, newCol, maxima);
    cannyTraceEdge(1, -1, newRow, newCol, maxima);
  }
}

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::discretizeAngles(pcl::PointCloud<PointOutT>& thet)
{
  const int height = thet.height;
  const int width = thet.width;
  float angle;
  for (int i = 0; i < height; i++) {
    for (int j = 0; j < width; j++) {
      angle = pcl::rad2deg(thet(j, i).direction);
      if (((angle <= 22.5) && (angle >= -22.5)) || (angle >= 157.5) ||
          (angle <= -157.5))
        thet(j, i).direction = 0;
      else if (((angle > 22.5) && (angle < 67.5)) ||
               ((angle < -112.5) && (angle > -157.5)))
        thet(j, i).direction = 45;
      else if (((angle >= 67.5) && (angle <= 112.5)) ||
               ((angle <= -67.5) && (angle >= -112.5)))
        thet(j, i).direction = 90;
      else if (((angle > 112.5) && (angle < 157.5)) ||
               ((angle < -22.5) && (angle > -67.5)))
        thet(j, i).direction = 135;
    }
  }
}

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::suppressNonMaxima(
    const pcl::PointCloud<PointXYZIEdge>& edges,
    pcl::PointCloud<PointXYZI>& maxima,
    float tLow)
{
  const int height = edges.height;
  const int width = edges.width;

  maxima.resize(edges.width, edges.height);

  for (auto& point : maxima)
    point.intensity = 0.0f;

  // tHigh and non-maximal suppression
  for (int i = 1; i < height - 1; i++) {
    for (int j = 1; j < width - 1; j++) {
      const PointXYZIEdge& ptedge = edges(j, i);
      PointXYZI& ptmax = maxima(j, i);

      if (ptedge.magnitude < tLow)
        continue;

      // maxima (j, i).intensity = 0;

      switch (static_cast<int>(ptedge.direction)) {
      case 0: {
        if (ptedge.magnitude >= edges(j - 1, i).magnitude &&
            ptedge.magnitude >= edges(j + 1, i).magnitude)
          ptmax.intensity = ptedge.magnitude;
        break;
      }
      case 45: {
        if (ptedge.magnitude >= edges(j - 1, i - 1).magnitude &&
            ptedge.magnitude >= edges(j + 1, i + 1).magnitude)
          ptmax.intensity = ptedge.magnitude;
        break;
      }
      case 90: {
        if (ptedge.magnitude >= edges(j, i - 1).magnitude &&
            ptedge.magnitude >= edges(j, i + 1).magnitude)
          ptmax.intensity = ptedge.magnitude;
        break;
      }
      case 135: {
        if (ptedge.magnitude >= edges(j + 1, i - 1).magnitude &&
            ptedge.magnitude >= edges(j - 1, i + 1).magnitude)
          ptmax.intensity = ptedge.magnitude;
        break;
      }
      }
    }
  }
}

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::detectEdgeCanny(pcl::PointCloud<PointOutT>& output)
{
  float tHigh = hysteresis_threshold_high_;
  float tLow = hysteresis_threshold_low_;
  const int height = input_->height;
  const int width = input_->width;

  output.resize(height * width);
  output.height = height;
  output.width = width;

  // Noise reduction using gaussian blurring
  pcl::PointCloud<PointXYZI>::Ptr gaussian_kernel(new pcl::PointCloud<PointXYZI>);
  PointCloudInPtr smoothed_cloud(new PointCloudIn);
  kernel_.setKernelSize(3);
  kernel_.setKernelSigma(1.0);
  kernel_.setKernelType(kernel<PointXYZI>::GAUSSIAN);
  kernel_.fetchKernel(*gaussian_kernel);
  convolution_.setKernel(*gaussian_kernel);
  convolution_.setInputCloud(input_);
  convolution_.filter(*smoothed_cloud);

  // Edge detection using Sobel
  pcl::PointCloud<PointXYZIEdge>::Ptr edges(new pcl::PointCloud<PointXYZIEdge>);
  setInputCloud(smoothed_cloud);
  detectEdgeSobel(*edges);

  // Edge discretization
  discretizeAngles(*edges);

  // tHigh and non-maximal suppression
  pcl::PointCloud<PointXYZI>::Ptr maxima(new pcl::PointCloud<PointXYZI>);
  suppressNonMaxima(*edges, *maxima, tLow);

  // Edge tracing
  for (int i = 0; i < height; i++) {
    for (int j = 0; j < width; j++) {
      if ((*maxima)(j, i).intensity < tHigh ||
          (*maxima)(j, i).intensity == std::numeric_limits<float>::max())
        continue;

      (*maxima)(j, i).intensity = std::numeric_limits<float>::max();
      cannyTraceEdge(1, 0, i, j, *maxima);
      cannyTraceEdge(-1, 0, i, j, *maxima);
      cannyTraceEdge(1, 1, i, j, *maxima);
      cannyTraceEdge(-1, -1, i, j, *maxima);
      cannyTraceEdge(0, -1, i, j, *maxima);
      cannyTraceEdge(0, 1, i, j, *maxima);
      cannyTraceEdge(-1, 1, i, j, *maxima);
      cannyTraceEdge(1, -1, i, j, *maxima);
    }
  }

  // Final thresholding
  for (std::size_t i = 0; i < input_->size(); ++i) {
    if ((*maxima)[i].intensity == std::numeric_limits<float>::max())
      output[i].magnitude = 255;
    else
      output[i].magnitude = 0;
  }
}

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::canny(const pcl::PointCloud<PointInT>& input_x,
                                 const pcl::PointCloud<PointInT>& input_y,
                                 pcl::PointCloud<PointOutT>& output)
{
  float tHigh = hysteresis_threshold_high_;
  float tLow = hysteresis_threshold_low_;
  const int height = input_x.height;
  const int width = input_x.width;

  output.resize(height * width);
  output.height = height;
  output.width = width;

  // Noise reduction using gaussian blurring
  pcl::PointCloud<PointXYZI>::Ptr gaussian_kernel(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelSize(3);
  kernel_.setKernelSigma(1.0);
  kernel_.setKernelType(kernel<PointXYZI>::GAUSSIAN);
  kernel_.fetchKernel(*gaussian_kernel);
  convolution_.setKernel(*gaussian_kernel);

  PointCloudIn smoothed_cloud_x;
  convolution_.setInputCloud(input_x.makeShared());
  convolution_.filter(smoothed_cloud_x);

  PointCloudIn smoothed_cloud_y;
  convolution_.setInputCloud(input_y.makeShared());
  convolution_.filter(smoothed_cloud_y);

  // Edge detection using Sobel
  pcl::PointCloud<PointXYZIEdge>::Ptr edges(new pcl::PointCloud<PointXYZIEdge>);
  sobelMagnitudeDirection(smoothed_cloud_x, smoothed_cloud_y, *edges.get());

  // Edge discretization
  discretizeAngles(*edges);

  pcl::PointCloud<PointXYZI>::Ptr maxima(new pcl::PointCloud<PointXYZI>);
  suppressNonMaxima(*edges, *maxima, tLow);

  // Edge tracing
  for (int i = 0; i < height; i++) {
    for (int j = 0; j < width; j++) {
      if ((*maxima)(j, i).intensity < tHigh ||
          (*maxima)(j, i).intensity == std::numeric_limits<float>::max())
        continue;

      (*maxima)(j, i).intensity = std::numeric_limits<float>::max();

      // clang-format off
      cannyTraceEdge( 1,  0, i, j, *maxima);
      cannyTraceEdge(-1,  0, i, j, *maxima);
      cannyTraceEdge( 1,  1, i, j, *maxima);
      cannyTraceEdge(-1, -1, i, j, *maxima);
      cannyTraceEdge( 0, -1, i, j, *maxima);
      cannyTraceEdge( 0,  1, i, j, *maxima);
      cannyTraceEdge(-1,  1, i, j, *maxima);
      cannyTraceEdge( 1, -1, i, j, *maxima);
      // clang-format on
    }
  }

  // Final thresholding
  for (int i = 0; i < height; i++) {
    for (int j = 0; j < width; j++) {
      if ((*maxima)(j, i).intensity == std::numeric_limits<float>::max())
        output(j, i).magnitude = 255;
      else
        output(j, i).magnitude = 0;
    }
  }
}

template <typename PointInT, typename PointOutT>
void
Edge<PointInT, PointOutT>::detectEdgeLoG(const float kernel_sigma,
                                         const float kernel_size,
                                         pcl::PointCloud<PointOutT>& output)
{
  convolution_.setInputCloud(input_);

  pcl::PointCloud<PointXYZI>::Ptr log_kernel(new pcl::PointCloud<PointXYZI>);
  kernel_.setKernelType(kernel<PointXYZI>::LOG);
  kernel_.setKernelSigma(kernel_sigma);
  kernel_.setKernelSize(kernel_size);
  kernel_.fetchKernel(*log_kernel);
  convolution_.setKernel(*log_kernel);
  convolution_.filter(output);
}

} // namespace pcl
