#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, ConditionalDeleter> {
  if (std::getenv("DOCTEST")) {
    exit(doctest::Context{argc, argv}.run());
  }

  bool should_delete;
  std::istream* result_ptr;

  switch (argc) {
    case 2:
      should_delete = true;
      result_ptr = new std::ifstream{argv[1]};
      break;
    case 1:
      should_delete = false;
      result_ptr = &std::cin;
      break;
    default:
      std::cerr << "bad arguments\n";
      exit(EXIT_FAILURE);
  }

  return {result_ptr, should_delete};
}

}