#include "common.hh"
#include <cassert>
#include <cmath>
#include <cstdlib>

[[nodiscard]] auto init_image(std::string const& t_input_file) noexcept
    -> std::pair<cv::Mat, cv::Mat>
{
	cv::Mat input_image = cv::imread(t_input_file, cv::IMREAD_COLOR);
	if (!input_image.data) {
		spdlog::critical("Could not open or find image!\n");
		exit(-1);
	}
	spdlog::debug("Image loaded!");
	spdlog::debug("Width:\t{}", input_image.size().width);
	spdlog::debug("Height:\t{}", input_image.size().height);
	cv::Mat process_image(input_image.size().height, input_image.size().width,
	                      CV_8UC3, cv::Scalar(0, 0, 0));
	return std::make_pair(std::move(input_image), process_image);
}

[[nodiscard]] auto euclidian_distance(cv::Mat const& t_img1,
                                      cv::Mat const& t_img2) -> double
{
	double euclidian = 0.0;
	for (auto itr1 = t_img1.begin<uchar>(), itr2 = t_img2.begin<uchar>();
	     itr1 != t_img1.end<uchar>() && itr2 != t_img2.end<uchar>();
	     ++itr1, ++itr2) {
		euclidian += std::pow(*itr1 - *itr2, 2);
	}
	euclidian = std::sqrt(euclidian);
	return euclidian;
}