#include "parseargs.hh"
#include <boost/program_options.hpp>
#include <cstdlib>
#include <iostream>

constexpr int DEFAULT_ITERATIONS = 5000;

using path = std::filesystem::path;
namespace po = boost::program_options;

void processFilenames(po::variables_map const &vm, path const &t_input,
                      path &t_output) {
  if (!vm.count("output")) {
    t_output.replace_filename("output_" +
                              std::string{t_input.filename().string()});
  } else if (!t_output.has_extension()) {
    t_output.replace_extension(".png");
  }
  if (vm.count("video")) {
    t_output.replace_extension(".mp4");
  }
}

std::tuple<path, path, bool, int> parse_args(int t_ac, char **t_av) {
  po::options_description desc("Allowed options");
  desc.add_options()("help,h", "Display this help message")(
      "input,i", po::value<path>(), "Input image")(
      "output,o", po::value<path>(),
      "Image or video output path (default: input path + \"_output\")")(
      "iterations,n", po::value<int>(),
      "Number of iterations (default: 5000)")("video,v", "Enable video output");
  po::variables_map vm;
  po::store(po::parse_command_line(t_ac, t_av, desc), vm);
  po::notify(vm);
  if (vm.count("help") || !vm.count("input")) {
    std::cout << desc << "\n";
    std::exit(1);
  }

  auto const input_path = vm["input"].as<path>();
  auto output_path =
      vm.count("output") ? vm["output"].as<path>() : input_path.filename();
  processFilenames(vm, input_path, output_path);

  return std::make_tuple(
      input_path, output_path, vm.count("video") ? true : false,
      vm.count("iterations") ? vm["iterations"].as<int>() : DEFAULT_ITERATIONS);
}