(function () {
  const COOKIE_KEY = 'lang';
  const LS_KEY = 'lang';
  const ONE_YEAR = 60 * 60 * 24 * 365;


  // ¡Ú ¸ÞÀÎ ÆäÀÌÁö(Ȩ) °æ·Î: ÇÊ¿äÇϸé "/default/index.php" µîÀ¸·Î ±³Ã¼
  const HOME_URL = "/";


  // 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';
  }


  // Ãʱ⠾ð¾î (ÄíÅ° > ·ÎÄýºÅ丮Áö > ±âº» KOR)
  const initialLang = getCookie(COOKIE_KEY) || localStorage.getItem(LS_KEY) || 'KOR';


  // ¾ð¾îº° URL ¸ÅÇÎ (location.pathname ½ÇÁ¦ °ª°ú µ¿ÀÏÇÏ°Ô ÀÛ¼ºÇØ¾ß ÇÔ)
  const URL_MAP = {
    "/default/face/sub01.php": "/default/face/sub01.php",
    "/default/face/sub02.php": "/default/face/TMJ.php",
    "/default/face/sub03.php": "/default/face/FNP.php",
    "/default/face/sub04.php": "/default/face/TN.php",
    "/default/diet/sub01.php": "/default/diet/dietEn.php",
    "/default/about/01.php": "/default/basic/01.php",
    "/default/health/sub01.php": "/default/Acupuncture/acupuncture.php",
    "/default/woman/sub01.php": "/default/Acupuncture/acupuncture.php",
    // ÇÊ¿ä ½Ã Ãß°¡
  };


  // ¸ðµç ÄÄÆ÷³ÍÆ® ÃʱâÈ­
  function initDropdown(root) {
    const wrap = root.querySelector('.lang-select');
    const native = root.querySelector('.lang-native'); // ¼û°ÜÁø select
    if (!wrap || !native) return;


    const trigger = wrap.querySelector('.lang-trigger');
    const current = wrap.querySelector('.lang-current');
    const list = wrap.querySelector('.lang-list');
    const items = Array.from(list.querySelectorAll('li'));


    // select¿Í ¸®½ºÆ® °ªÀ» µ¿±âÈ­
    function sync(val) {
      const matchItem = items.find(li => li.getAttribute('data-value') === val);
      if (matchItem) {
        current.textContent = matchItem.textContent.trim();
        items.forEach(x => x.classList.toggle('is-active', x === matchItem));
      }
      native.value = val;
    }


    // open/close
    const open  = () => { wrap.dataset.open = 'true';  trigger.setAttribute('aria-expanded', 'true'); };
    const close = () => { wrap.dataset.open = 'false'; trigger.setAttribute('aria-expanded', 'false'); };
    const toggle= () => { (wrap.dataset.open === 'true') ? close() : open(); };


    // ÃÖÃÊ µ¿±âÈ­(ÄíÅ°/LS ±âÁØ)
    sync(initialLang);


    // ¿­±â/´Ý±â
    trigger.addEventListener('click', (e) => {
      e.stopPropagation();
      toggle();
    });


    // Ç׸ñ Ŭ¸¯
    items.forEach(li => {
      li.addEventListener('click', (e) => {
        const val = li.getAttribute('data-value');
        sync(val);


        // ÄíÅ°/LS ÀúÀå
        setCookie(COOKIE_KEY, val, ONE_YEAR);
        localStorage.setItem(LS_KEY, val);


        // change À̺¥Æ® (±âÁ¸ ÄÚµå¿ÍÀÇ È£È¯)
        native.dispatchEvent(new Event('change', { bubbles: true }));


        // === URL ¸ÅÇΠó¸® (+ ¸ÅÇÎ ¾øÀ¸¸é ȨÀ¸·Î) ===
        const path = location.pathname; // ¿¹: "/default/face/sub02.php"


        if (val === 'EN') {
          if (URL_MAP[path]) {
            location.href = URL_MAP[path];   // KOR ¡æ EN ¸ÅÇÎ
            return;
          } else {
            location.href = HOME_URL;        // ¸ÅÇÎ ¾øÀ¸¸é Ȩ
            return;
          }
        }


        if (val === 'KOR') {
          const back = Object.entries(URL_MAP).find(([kor, en]) => en === path);
          if (back) {
            location.href = back[0];         // EN ¡æ KOR ¸ÅÇÎ
            return;
          } else {
            location.href = HOME_URL;        // ¸ÅÇÎ ¾øÀ¸¸é Ȩ
            return;
          }
        }
        // === ³¡ ===


        // (¿©±â±îÁö ¸ø ¿ÔÀ¸¸é) ¸ÅÇÎ ¾øÀ» ¶§ ±âÁ¸Ã³·³ »õ·Î°íħ
        location.reload();
      });
    });


    // ¿ÜºÎ Ŭ¸¯ ´Ý±â
    document.addEventListener('click', close);


    // Å°º¸µå Á¢±Ù¼º
    trigger.addEventListener('keydown', (e) => {
      if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); toggle(); }
      if (e.key === 'Escape') close();
      if (e.key === 'ArrowDown') { e.preventDefault(); open(); (items[0] || trigger).focus?.(); }
    });


    // ¿ÜºÎ ½ºÅ©¸³Æ®°¡ native °ªÀ» ¹Ù²Ü °æ¿ì µ¿±âÈ­
    native.addEventListener('change', () => sync(native.value));
  }


  // ÆäÀÌÁö ³» ¸ðµç lang-select-wrap ÃʱâÈ­
  function boot() {
    document.querySelectorAll('.lang-select-wrap').forEach(initDropdown);
  }
  (document.readyState === 'loading') ? document.addEventListener('DOMContentLoaded', boot) : boot();
})();