(function () {
  const COOKIE_KEY = 'lang';
  const LS_KEY = 'lang';              // ¼±Å𪠷ÎÄà À¯Áö¿ë(¿É¼Ç)
  const ONE_YEAR = 60 * 60 * 24 * 365;


  // cookie helpers
  function getCookie(name) {
    const m = document.cookie.match(new RegExp('(?:^|; )' + name + '=([^;]*)'));
    return m ? decodeURIComponent(m[1]) : null;
  }
  function setCookie(name, value, maxAge) {
    document.cookie = name + '=' + encodeURIComponent(value)
      + '; path=/; max-age=' + maxAge + '; SameSite=Lax';
    // ÇÊ¿äÇÏ¸é µµ¸ÞÀÎ ÁöÁ¤:
    // + '; domain=.' + location.hostname.replace(/^www\./, '')
  }


  // ÇöÀç ¾ð¾î °áÁ¤ (ÄíÅ° > ·ÎÄýºÅ丮Áö > ±âº» KOR)
  const current = getCookie(COOKIE_KEY) || localStorage.getItem(LS_KEY) || 'KOR';


  // ÆäÀÌÁö¿¡ ÀÖ´Â ¸ðµç select#lang °ª µ¿±âÈ­
  function syncSelects(val) {
    document.querySelectorAll('#lang').forEach(el => { if (el) el.value = val; });
  }


  // Ãʱ⠵¿±âÈ­
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', () => syncSelects(current));
  } else {
    syncSelects(current);
  }


  // ¼¿·ºÆ® º¯°æ ½Ã: ÄíÅ° ÀúÀå ¡æ ¸®·Îµå(¼­¹ö ºÐ±â Àû¿ë)
  document.addEventListener('change', (e) => {
    if (e.target && e.target.id === 'lang') {
      const v = e.target.value === 'EN' ? 'EN' : 'KOR';
      setCookie(COOKIE_KEY, v, ONE_YEAR);
      localStorage.setItem(LS_KEY, v);  // ¼±Å𪠺¸Á¸(¿É¼Ç)
      location.reload();                // ¡Ú ¼­¹ö¿¡¼­ EN/KOR·Î ´Ù½Ã ·»´õ
    }
  });
})();