#include <filesystem>
#include <iostream>

namespace fs = std::filesystem;

int main(int argc, const char* argv[]) {
    // We take an image path and a list of points (grouped by 4 to define
    // bounding boxes).
    if (argc < 6 or (argc - 2) % 4 != 0) {
        std::cerr
            << "Usage: " << argv[0] << " path/to/image"
            << " x1 y1 x2 y2 [...]\n"
            << "x/y points must be grouped by 4 to define bounding boxes\n";
        return 1;
    }

    const fs::path input(argv[1]);
    if (!fs::exists(input)) {
        std::cerr << "Input file " << input << " does not exist.\n";
        return 1;
    }

    return 0;
}