import i18n from "i18next";
import { initReactI18next } from "react-i18next";
import { sq } from "./sq.js";
import { en } from "./en.js";

// i18next setup for the operator UI. Albanian (sq) is the DEFAULT and the fallback;
// English (en) is the second language. The active language is the LOGGED-IN USER's
// stored preference (users.language), applied via setLanguage() after auth resolves
// — not localStorage, not the browser. Printed tickets are NOT governed by this
// (always Albanian, customer-facing). See wiki/concepts/i18n.md.

export type Lang = "sq" | "en";

// Single flat namespace; keys are dot-paths (e.g. "booth.processTicket"). Nested
// objects in the catalogs are walked by i18next's keySeparator.
void i18n.use(initReactI18next).init({
  resources: {
    sq: { translation: sq },
    en: { translation: en },
  },
  lng: "sq",
  fallbackLng: "sq",
  interpolation: { escapeValue: false }, // React already escapes
  returnNull: false,
});

/** Apply a language (e.g. after login resolves the user's preference). No-op if
 *  already active. */
export function setLanguage(lang: Lang): void {
  if (i18n.language !== lang) void i18n.changeLanguage(lang);
}

export default i18n;