/*!
 * All material copyright ESRI, All Rights Reserved, unless otherwise specified.
 * See https://github.com/Esri/calcite-components/blob/master/LICENSE.md for details.
 * v1.0.0-beta.82
 */
import { getAssetPath } from "@stencil/core";
import { locales } from "../../utils/locale";
/**
 * Get supported locale code from raw user input
 * Exported for testing purposes.
 * @private
 */
function getSupportedLocale(lang = "") {
  if (locales.indexOf(lang) > -1) {
    return lang;
  }
  lang = lang.toLowerCase();
  if (lang.includes("-")) {
    lang = lang.replace(/(\w+)-(\w+)/, (_match, language, region) => `${language}-${region.toUpperCase()}`);
    if (!locales.includes(lang)) {
      lang = lang.split("-")[0];
    }
  }
  return locales.includes(lang) ? lang : "en";
}
/**
 * CLDR cache.
 * Exported for testing purposes.
 * @private
 */
export const translationCache = {};
/**
 * CLDR request cache.
 * Exported for testing purposes.
 * @private
 */
export const requestCache = {};
/**
 * Fetch calendar data for a given locale from list of supported languages
 * @public
 */
export async function getLocaleData(lang) {
  const locale = getSupportedLocale(lang);
  if (translationCache[locale]) {
    return translationCache[locale];
  }
  if (!requestCache[locale]) {
    requestCache[locale] = fetch(getAssetPath(`./assets/date-picker/nls/${locale}.json`))
      .then((resp) => resp.json())
      .catch(() => {
      console.error(`Translations for "${locale}" not found or invalid, falling back to english`);
      return getLocaleData("en");
    });
  }
  const data = await requestCache[locale];
  translationCache[locale] = data;
  return data;
}