"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getAllTranslations = getAllTranslations;
exports.getAllTranslationsFromPaths = getAllTranslationsFromPaths;
exports.getRegisteredLocales = getRegisteredLocales;
exports.getTranslationsByLocale = getTranslationsByLocale;
exports.registerTranslationFile = registerTranslationFile;
exports.registerTranslationFiles = registerTranslationFiles;
var fs = _interopRequireWildcard(require("fs"));
var path = _interopRequireWildcard(require("path"));
var _util = require("util");
var _helper = require("./core/helper");
function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function (nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }
function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

const TRANSLATION_FILE_EXTENSION = '.json';

/**
 * Internal property for storing registered translations paths.
 * Key is locale, value is array of registered paths
 */
const translationsRegistry = {};

/**
 * Internal property for caching loaded translations files.
 * Key is path to translation file, value is object with translation messages
 */
const loadedFiles = {};

/**
 * Returns locale by the given translation file name
 * @param fullFileName
 * @returns locale
 * @example
 * getLocaleFromFileName('./path/to/translation/ru.json') // => 'ru'
 */
function getLocaleFromFileName(fullFileName) {
  if (!fullFileName) {
    throw new Error('Filename is empty');
  }
  const fileExt = path.extname(fullFileName);
  if (fileExt !== TRANSLATION_FILE_EXTENSION) {
    throw new Error(`Translations must have 'json' extension. File being registered is ${fullFileName}`);
  }
  return path.basename(fullFileName, TRANSLATION_FILE_EXTENSION);
}

/**
 * Loads file and parses it as JSON
 * @param pathToFile
 * @returns
 */
async function loadFile(pathToFile) {
  // doing this at the moment because fs is mocked in a lot of places where this would otherwise fail
  return JSON.parse(await (0, _util.promisify)(fs.readFile)(pathToFile, 'utf8'));
}

/**
 * Loads translations files and adds them into "loadedFiles" cache
 * @param files
 * @returns
 */
async function loadAndCacheFiles(files) {
  const translations = await Promise.all(files.map(loadFile));
  files.forEach((file, index) => {
    loadedFiles[file] = translations[index];
  });
}

/**
 * Registers translation file with i18n loader
 * @param translationFilePath - Absolute path to the translation file to register.
 */
function registerTranslationFile(translationFilePath) {
  if (!path.isAbsolute(translationFilePath)) {
    throw new TypeError('Paths to translation files must be absolute. ' + `Got relative path: "${translationFilePath}"`);
  }
  const locale = getLocaleFromFileName(translationFilePath);
  translationsRegistry[locale] = (0, _helper.unique)([...(translationsRegistry[locale] || []), translationFilePath]);
}

/**
 * Registers array of translation files with i18n loader
 * @param arrayOfPaths - Array of absolute paths to the translation files to register.
 */
function registerTranslationFiles(arrayOfPaths = []) {
  arrayOfPaths.forEach(registerTranslationFile);
}

/**
 * Returns an array of locales that have been registered with i18n loader
 * @returns registeredTranslations
 */
function getRegisteredLocales() {
  return Object.keys(translationsRegistry);
}

/**
 * Returns translation messages by specified locale
 * @param locale
 * @returns translation messages
 */
async function getTranslationsByLocale(locale) {
  const files = translationsRegistry[locale] || [];
  const notLoadedFiles = files.filter(file => !loadedFiles[file]);
  if (notLoadedFiles.length) {
    await loadAndCacheFiles(notLoadedFiles);
  }
  if (!files.length) {
    return {
      messages: {}
    };
  }
  return files.reduce((translation, file) => ({
    locale: loadedFiles[file].locale || translation.locale,
    formats: loadedFiles[file].formats || translation.formats,
    messages: {
      ...loadedFiles[file].messages,
      ...translation.messages
    }
  }), {
    locale,
    messages: {}
  });
}

/**
 * Returns all translations for registered locales
 * @returns A Promise object
 * where keys are the locale and values are objects of translation messages
 */
async function getAllTranslations() {
  const locales = getRegisteredLocales();
  const translations = await Promise.all(locales.map(getTranslationsByLocale));
  return locales.reduce((acc, locale, index) => ({
    ...acc,
    [locale]: translations[index]
  }), {});
}

/**
 * Registers passed translations files, loads them and returns promise with
 * all translation messages
 * @param paths - Array of absolute paths to the translation files
 * @returns A Promise object where
 * keys are the locale and values are objects of translation messages
 */
async function getAllTranslationsFromPaths(paths) {
  registerTranslationFiles(paths);
  return await getAllTranslations();
}