#include <aocpp/Startup.hpp>

#include <cstdlib>
#include <iostream>
#include <optional>
#include <memory>
#include <fstream>
#include <utility>

#define DOCTEST_CONFIG_IMPLEMENT
#include <doctest.h>

namespace aocpp {

auto Startup(int argc, char ** argv) -> std::unique_ptr<std::istream, void(*)(std::istream*)> {
  if (std::getenv("DOCTEST")) {
    exit(doctest::Context{argc, argv}.run());
  }

  switch (argc) {
    case 2:
      return {new std::ifstream{argv[1]}, [](std::istream* p) { delete p; }};
    case 1:
      return {&std::cin, [](std::istream*){}};
    default:
      std::cerr << "bad arguments\n";
      exit(EXIT_FAILURE);
  }
}

}