/* Copyright 2017 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/** @typedef {import("./interfaces").IL10n} IL10n */

import "../external/webL10n/l10n.js";
import { getL10nFallback } from "./l10n_utils.js";

const PARTIAL_LANG_CODES = {
  en: "en-US",
  es: "es-ES",
  fy: "fy-NL",
  ga: "ga-IE",
  gu: "gu-IN",
  hi: "hi-IN",
  hy: "hy-AM",
  nb: "nb-NO",
  ne: "ne-NP",
  nn: "nn-NO",
  pa: "pa-IN",
  pt: "pt-PT",
  sv: "sv-SE",
  zh: "zh-CN",
};

// Try to support "incompletely" specified language codes (see issue 13689).
function fixupLangCode(langCode) {
  return PARTIAL_LANG_CODES[langCode?.toLowerCase()] || langCode;
}

/**
 * @implements {IL10n}
 */
class GenericL10n {
  constructor(lang) {
    const { webL10n } = document;
    this._lang = lang;
    this._ready = new Promise((resolve, reject) => {
      webL10n.setLanguage(fixupLangCode(lang), () => {
        resolve(webL10n);
      });
    });
  }

  async getLanguage() {
    const l10n = await this._ready;
    return l10n.getLanguage();
  }

  async getDirection() {
    const l10n = await this._ready;
    return l10n.getDirection();
  }

  async get(key, args = null, fallback = getL10nFallback(key, args)) {
    const l10n = await this._ready;
    return l10n.get(key, args, fallback);
  }

  async translate(element) {
    const l10n = await this._ready;
    return l10n.translate(element);
  }
}

export { GenericL10n };