#include "kapi/cio.hpp"

#include <optional>
#include <utility>

namespace teachos::cio
{
  auto constinit null_device = output_device{};

  auto constinit active_device = &null_device;

  auto set_output_device(output_device & device) -> std::optional<output_device *>
  {
    if (&device == active_device)
    {
      return {};
    }
    return std::exchange(active_device, &device);
  }

  auto print(std::string_view text) -> void { active_device->write(text); }

  auto println(std::string_view text) -> void { active_device->writeln(text); }

  auto print_error(std::string_view text) -> void { active_device->write_error(text); }

  auto println_error(std::string_view text) -> void { active_device->writeln_error(text); }

}  // namespace teachos::cio