/**
 * Lets the emails speak the instance's language from the same catalogs as
 * the interface. A template passes each message as a descriptor holding its
 * id and its English, as `i18n._({ id: "email.reset.title", message: "Reset
 * your password" })`, or one of `shared/digest-messages.ts`, which a page
 * says too. `lingui extract` reads them into `locales/<lang>.po` beside the
 * interface's messages, and `lingui compile` turns the catalogs into the
 * `locales/<lang>.mjs` imported here, failing when a language lacks one. The
 * ids are named rather than hashed from the English, since the server runs
 * no Lingui macro.
 *
 * @module
 */

import { type I18n, type Messages, setupI18n } from "@lingui/core";

import { EMAIL_LOCALE } from "../config.ts";
import { LOCALES } from "../../shared/locale.ts";

const catalogs: [string, Messages][] = await Promise.all(
  LOCALES.map(async (locale) =>
    [
      locale,
      (await import(`../../locales/${locale}.mjs`)).messages as Messages,
    ] as [string, Messages]
  ),
);

/**
 * Translates the emails' messages, in {@link EMAIL_LOCALE}. Every catalog is
 * loaded, so a test can activate another language.
 */
export const i18n: I18n = setupI18n({
  locale: EMAIL_LOCALE,
  messages: Object.fromEntries(catalogs),
});