#include "kern/print.hpp"

#include <string_view>

namespace teachos
{
  namespace
  {
    constinit auto noop = [](std::string_view) {};

    constinit auto current_print_handler = static_cast<print_handler *>(noop);
    constinit auto current_println_handler = static_cast<println_handler *>(noop);
    constinit auto current_print_error_handler = static_cast<print_handler *>(noop);
    constinit auto current_println_error_handler = static_cast<println_handler *>(noop);
  }  // namespace

  auto print(std::string_view text) -> void { current_print_handler(text); }
  auto println(std::string_view text) -> void { current_println_handler(text); }
  auto print_error(std::string_view text) -> void { current_print_error_handler(text); }
  auto println_error(std::string_view text) -> void { current_println_error_handler(text); }

  auto set_print_handler(print_handler handler) -> print_handler *
  {
    auto old = current_print_handler;
    current_print_handler = handler;
    return old;
  }

  auto set_println_handler(println_handler handler) -> print_handler *
  {
    auto old = current_println_handler;
    current_println_handler = handler;
    return old;
  }

  auto set_print_error_handler(print_handler handler) -> print_handler *
  {
    auto old = current_print_error_handler;
    current_print_error_handler = handler;
    return old;
  }

  auto set_println_error_handler(println_handler handler) -> print_handler *
  {
    auto old = current_println_error_handler;
    current_println_error_handler = handler;
    return old;
  }

}  // namespace teachos