import type { LocalizationMessages, NestedLocalizationMessages } from './types';

function flat(source: Record<string, unknown>): Record<string, string> {
  const target: Record<string, string> = {};
  flatten(source, target);
  return target;
}

function flatten(source: any, target: Record<string, string>, prop = '') {
  if (typeof source === 'string') {
    target[prop] = source;

    return;
  }

  if (typeof source === 'object' && source !== null) {
    Object.keys(source).forEach((key) => {
      flatten(source[key], target, prop ? `${prop}.${key}` : key);
    });

    return;
  }
}

export function flattenTranslations(messages: LocalizationMessages | NestedLocalizationMessages): LocalizationMessages {
  return Object.fromEntries(
    Object.entries(messages).map(([language, translations]) => {
      return [language, flat(translations)];
    }),
  );
}