'use strict';
// Cookie-based redirection
(function () {
  const SUPPORTED_LANGS = new Set(['en', 'pt-BR', 'es-ES']);
  const DEFAULT_LANG = [...SUPPORTED_LANGS][0];
  const COOKIE_NAME = 'lang';
  const COOKIE_DELIMITER = '|||';

  function getCurrentLang() {
    const [, lang] =
      window.location.pathname.match(/\/([a-z]{2}-[a-z]{2})(\/|$)/) || [];
    const detectedLang = lang || DEFAULT_LANG;
    console.log('[LANGUAGE SYNC]: Current language detected:', detectedLang);
    return detectedLang;
  }

  function normalizePath(path) {
    return path || '/';
  }

  function buildNewPath(targetLang, currentLang, currentPath) {
    let newPath = currentPath;
    if (currentLang !== DEFAULT_LANG) {
      newPath = newPath.replace(`/${currentLang}`, '');
    }
    if (targetLang !== DEFAULT_LANG) {
      newPath = `/${targetLang}${newPath === '/' ? '' : newPath}`;
    }
    return normalizePath(newPath);
  }

  function redirectToLang(lang) {
    console.log(
      '[LANGUAGE SYNC]: Received request to redirect to language:',
      lang
    );
    const normalizedTargetLang = lang.toLowerCase();
    const currentLang = getCurrentLang();
    if (currentLang === normalizedTargetLang) {
      console.log(
        '[LANGUAGE SYNC]: Language matches current page, no redirect needed'
      );
      return;
    }
    const newPath = buildNewPath(
      normalizedTargetLang,
      currentLang,
      window.location.pathname
    );
    const newUrl = `${newPath}${window.location.search}${window.location.hash}`;
    if (
      newUrl !==
      `${window.location.pathname}${window.location.search}${window.location.hash}`
    ) {
      console.log('[LANGUAGE SYNC]: Performing redirect to:', newUrl);
      window.location.href = newUrl;
    }
  }

  function getCookie(name) {
    const value = `; ${document.cookie}`;
    const parts = value.split(`; ${name}=`);
    if (parts.length === 2) {
      const lastPart = parts.pop();
      if (lastPart) {
        const cookieValue = lastPart.split(';').shift();
        return cookieValue ? decodeURIComponent(cookieValue) : undefined;
      }
    }
    return undefined;
  }

  function getTargetLangFromCookie() {
    const cookieValue = getCookie(COOKIE_NAME);

    // no cookie found
    if (!cookieValue) {
      console.log('[LANGUAGE SYNC]: No valid language cookie found');
      return null;
    }

    const langPart = cookieValue.split(COOKIE_DELIMITER)[0];

    // fallback to default lang if language is not supported
    if (!SUPPORTED_LANGS.has(langPart)) {
      console.log(
        '[LANGUAGE SYNC]: Unsupported language in cookie:',
        langPart,
        'defaulting to:',
        DEFAULT_LANG
      );
      return DEFAULT_LANG;
    }

    // valid language found in cookie
    console.log('[LANGUAGE SYNC]: Found language in cookie:', langPart);
    return langPart;
  }

  function attemptCookieBasedRedirect() {
    const targetLang = getTargetLangFromCookie();
    if (!targetLang) {
      return;
    }

    redirectToLang(targetLang);
  }

  attemptCookieBasedRedirect();
})();