#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");
	}
}

[[nodiscard]] auto parse_args(int t_ac, char** t_av)
    -> std::tuple<path, path, int, int, bool>
{
	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 output path (default: input path + \"_output\")")(
	    "method,m", po::value<int>(), "Method number to be used (default: 1)")(
	    "iterations,n", po::value<int>(), "Number of iterations (default: 5000)")(
	    "verbose,v", "Enables verbosity");
	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("iterations") ? vm["iterations"].as<int>() : DEFAULT_ITERATIONS,
	    vm.count("method") ? vm["method"].as<int>() : 1,
	    vm.count("verbose") ? true : false);
}