/**
 * Crash console i18n — JSON catalogs (en default), same key style as Android strings.xml.
 */
(function (global) {
  const STORAGE_KEY = 'crash_console_lang';
  const SUPPORTED = ['en', 'ru'];
  const DEFAULT_LANG = 'en';

  /** @type {Record<string, { flag: string, code: string }>} */
  const LANG_DISPLAY = {
    en: { flag: '\uD83C\uDDEC\uD83C\uDDE7', code: 'EN' },
    ru: { flag: '\uD83C\uDDF7\uD83C\uDDFA', code: 'RU' },
  };

  let lang = DEFAULT_LANG;
  let catalog = {};
  let fallback = {};
  let readyResolve;
  const ready = new Promise((resolve) => {
    readyResolve = resolve;
  });

  function basePath() {
    const body = document.body;
    return body ? body.getAttribute('data-base-path') || '' : '';
  }

  /** Close stray modal layers so fixed backdrops never block login/console UI. */
  function dismissPlatformOverlays() {
    document.querySelectorAll('#graph-detail-overlay, #tag-modal, #hub-docs-modal').forEach((el) => {
      el.hidden = true;
      el.setAttribute('aria-hidden', 'true');
    });
    const dialog = document.getElementById('ticket-create-dialog');
    if (dialog && dialog.open && typeof dialog.close === 'function') {
      dialog.close();
    }
  }

  function storedLang() {
    try {
      const v = localStorage.getItem(STORAGE_KEY);
      return SUPPORTED.includes(v) ? v : DEFAULT_LANG;
    } catch {
      return DEFAULT_LANG;
    }
  }

  function persistLang(code) {
    try {
      localStorage.setItem(STORAGE_KEY, code);
    } catch { /* ignore */ }
  }

  function fetchCatalog(code) {
    const url = basePath() + '/assets/i18n/' + encodeURIComponent(code) + '.json';
    return fetch(url, { credentials: 'same-origin' }).then((res) => {
      if (!res.ok) throw new Error('i18n load failed: ' + code);
      return res.json();
    });
  }

  /**
   * @param {string} key
   * @param {Record<string, string|number>|undefined} params
   */
  function t(key, params) {
    let s = catalog[key] ?? fallback[key] ?? key;
    if (params) {
      Object.keys(params).forEach((k) => {
        s = s.split('{' + k + '}').join(String(params[k]));
      });
    }
    return s;
  }

  function apply(root) {
    const scope = root || document;
    scope.querySelectorAll('[data-i18n]').forEach((el) => {
      const key = el.getAttribute('data-i18n');
      if (!key) return;
      if (el.hasAttribute('data-i18n-html')) {
        el.innerHTML = t(key);
      } else {
        el.textContent = t(key);
      }
    });
    scope.querySelectorAll('[data-i18n-placeholder]').forEach((el) => {
      const key = el.getAttribute('data-i18n-placeholder');
      if (key) el.setAttribute('placeholder', t(key));
    });
    scope.querySelectorAll('[data-i18n-title]').forEach((el) => {
      const key = el.getAttribute('data-i18n-title');
      if (key) el.setAttribute('title', t(key));
    });
    scope.querySelectorAll('[data-i18n-aria]').forEach((el) => {
      const key = el.getAttribute('data-i18n-aria');
      if (key) el.setAttribute('aria-label', t(key));
    });
    scope.querySelectorAll('select[data-i18n-options]').forEach((sel) => {
      const prefix = sel.getAttribute('data-i18n-options');
      if (!prefix) return;
      sel.querySelectorAll('option[data-i18n]').forEach((opt) => {
        const k = opt.getAttribute('data-i18n');
        if (k) opt.textContent = t(k);
      });
    });
    scope.querySelectorAll('.platform-footer__left[data-i18n], footer[data-i18n="footer.copyright"]').forEach((footer) => {
      const year = footer.getAttribute('data-year') || String(new Date().getFullYear());
      footer.textContent = t(footer.getAttribute('data-i18n') || 'footer.copyright', { year });
    });
    scope.querySelectorAll('[data-i18n="detail.report_meta"]').forEach((el) => {
      el.textContent = t('detail.report_meta', {
        id: el.getAttribute('data-i18n-id') || '',
        type: el.getAttribute('data-i18n-type') || '',
      });
    });
  }

  function langOptionLabel(code) {
    const meta = LANG_DISPLAY[code] || LANG_DISPLAY[DEFAULT_LANG];
    return meta.flag + ' ' + meta.code;
  }

  function syncLangSelect() {
    document.querySelectorAll('.lang-select').forEach((sel) => {
      SUPPORTED.forEach((code) => {
        const opt = sel.querySelector('option[value="' + code + '"]');
        if (opt) opt.textContent = langOptionLabel(code);
      });
      if (sel.value !== lang) sel.value = lang;
    });
    syncLocaleDisplay(lang);
  }

  function syncLocaleDisplay(code) {
    const meta = LANG_DISPLAY[code] || LANG_DISPLAY[DEFAULT_LANG];
    document.querySelectorAll('.locale-flag').forEach((el) => {
      el.textContent = meta.flag;
    });
    document.querySelectorAll('.locale-code').forEach((el) => {
      el.textContent = meta.code;
    });
  }

  async function setLang(code, options) {
    const opts = options || {};
    if (!SUPPORTED.includes(code)) code = DEFAULT_LANG;
    fallback = await fetchCatalog(DEFAULT_LANG);
    catalog = code === DEFAULT_LANG ? { ...fallback } : await fetchCatalog(code);
    lang = code;
    document.documentElement.setAttribute('lang', code);
    persistLang(code);
    syncLangSelect();
    if (!opts.silent) {
      apply(document);
      document.dispatchEvent(new CustomEvent('crash-i18n-change', { detail: { lang: code } }));
    }
  }

  function getLang() {
    return lang;
  }

  function initLangSelect() {
    document.querySelectorAll('.lang-select').forEach((sel) => {
      sel.value = lang;
      if (sel.dataset.i18nBound === '1') return;
      sel.dataset.i18nBound = '1';
      sel.addEventListener('change', () => {
        setLang(sel.value).catch(() => setLang(DEFAULT_LANG));
      });
    });
  }

  async function init() {
    dismissPlatformOverlays();
    lang = storedLang();
    document.documentElement.setAttribute('lang', lang);
    await setLang(lang, { silent: true });
    apply(document);
    initLangSelect();
    syncLocaleDisplay(lang);
    readyResolve();
  }

  global.CrashI18n = {
    t,
    apply,
    setLang,
    getLang,
    init,
    ready,
    SUPPORTED,
  };

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', () => {
      init().catch(() => {
        lang = DEFAULT_LANG;
        readyResolve();
      });
    });
  } else {
    init().catch(() => readyResolve());
  }
})(typeof window !== 'undefined' ? window : globalThis);