/*
	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
	Copyright (C) 2023 Spacebar and Spacebar Contributors
	
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published
	by the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.
	
	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import fs from "fs";
import path from "path";
import i18next from "i18next";
import i18nextMiddleware from "i18next-http-middleware";
import i18nextBackend from "i18next-fs-backend";
import { Router } from "express";

const ASSET_FOLDER_PATH = path.join(__dirname, "..", "..", "..", "assets");

export async function initTranslation(router: Router) {
    const languages = fs.readdirSync(path.join(ASSET_FOLDER_PATH, "locales"));
    const namespaces = fs.readdirSync(path.join(ASSET_FOLDER_PATH, "locales", "en"));
    const ns = namespaces.filter((x) => x.endsWith(".json")).map((x) => x.slice(0, x.length - 5));

    await i18next
        .use(i18nextBackend)
        .use(i18nextMiddleware.LanguageDetector)
        .init({
            preload: languages,
            // debug: true,
            fallbackLng: "en",
            ns,
            backend: {
                loadPath: path.join(ASSET_FOLDER_PATH, "locales") + "/{{lng}}/{{ns}}.json",
            },
            load: "all",
        });

    router.use(i18nextMiddleware.handle(i18next, {}));
}