"use strict";

(function (root) {
  // Translations are data files (ui/i18n/<language>.json); adding a language means adding a file.
  // The Core injects the catalogs into the window before the page runs; Node tests read the files.
  const catalogs = (function loadCatalogs() {
    const injected = globalThis.__CHJ_I18N__ && globalThis.__CHJ_I18N__.catalogs && globalThis.__CHJ_I18N__.catalogs.module;
    if (injected) return injected;
    if (typeof require === "function" && typeof __dirname === "string") {
      const fs = require("fs"), path = require("path"), dir = path.join(__dirname, "i18n"), result = {};
      for (const file of fs.readdirSync(dir)) if (/^[a-z]{2,3}(-[A-Za-z0-9]+)?\.json$/.test(file)) result[file.slice(0, -5)] = JSON.parse(fs.readFileSync(path.join(dir, file), "utf8"));
      return result;
    }
    return {};
  })();
  // Language list (native names, locales, text direction) injected by the Core.
  const languageEntry = (code) => (globalThis.__CHJ_I18N__?.manifest?.languages || []).find((entry) => entry.code === code);
  function createI18n(initialLanguage = "en") {
    let language;
    const setLanguage = (value) => {
      // Exact code first (zh-tw), then the base language (de-at → de).
      const full = String(value || "").toLowerCase().replace(/_/g, "-");
      const requested = Object.hasOwn(catalogs, full) ? full : full.split("-")[0];
      language = Object.hasOwn(catalogs, requested) ? requested : "en";
      return language;
    };
    setLanguage(initialLanguage);
    const t = (key, values = {}) => (catalogs[language][key] || catalogs.en[key] || key)
      .replace(/\{(\w+)\}/g, (match, name) => Object.hasOwn(values, name) ? String(values[name]) : match);
    const staticText = new WeakMap();
    let applied = false;
    const apply = (document) => {
      document.documentElement.lang = language;
      document.documentElement.dir = languageEntry(language)?.dir === "rtl" ? "rtl" : "ltr";
      // Text a module has set itself (a version, a count, server data) is not the static translation.
      document.querySelectorAll("[data-i18n]").forEach((element) => {
        if (staticText.has(element) && element.textContent !== staticText.get(element)) return;
        const text = t(element.dataset.i18n);
        element.textContent = text;
        staticText.set(element, text);
      });
      // A status message from before the switch is in the old language.
      const status = applied ? document.getElementById("status") : null;
      if (status) { status.textContent = ""; status.classList.remove("error"); }
      applied = true;
      document.querySelectorAll("[data-i18n-aria-label]").forEach((element) => { element.setAttribute("aria-label", t(element.dataset.i18nAriaLabel)); });
    };
    const errorMessage = (error) => {
      const message = error?.message || String(error || t("Unknown error"));
      const code = error?.code || message.match(/\b(HASH_[A-Z_]+|ENOENT|EACCES|EPERM)\b/)?.[1];
      return language !== "en" && catalogs[language][code] ? t(code) : message;
    };
    return { t, apply, setLanguage, getLanguage: () => language, errorMessage };
  }
  const exported = { catalogs, createI18n };
  if (typeof module === "object" && module.exports) module.exports = exported;
  else root.chjHashI18n = exported;
})(typeof window === "object" ? window : globalThis);