"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getFlattenedObject = getFlattenedObject;
/*
 * 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.
 */

function shouldReadKeys(value) {
  return typeof value === 'object' && value !== null && !Array.isArray(value);
}

/**
 *  Flattens a deeply nested object to a map of dot-separated
 *  paths pointing to all primitive values **and arrays**
 *  from `rootValue`.
 *
 *  example:
 *    getFlattenedObject({ a: { b: 1, c: [2,3] } })
 *    // => { 'a.b': 1, 'a.c': [2,3] }
 *
 *  @public
 */
function getFlattenedObject(rootValue) {
  if (!shouldReadKeys(rootValue)) {
    throw new TypeError(`Root value is not flatten-able, received ${rootValue}`);
  }
  const result = {};
  (function flatten(prefix, object) {
    for (const [key, value] of Object.entries(object)) {
      const path = prefix ? `${prefix}.${key}` : key;
      if (shouldReadKeys(value)) {
        flatten(path, value);
      } else {
        result[path] = value;
      }
    }
  })('', rootValue);
  return result;
}