/**
 * This implementation is taken from Lodash implementation.
 * See: https://github.com/lodash/lodash/blob/master/isPlainObject.js
 */

function getTag(value: any): string {
  if (value === null) {
    return value === undefined ? '[object Undefined]' : '[object Null]';
  }

  return Object.prototype.toString.call(value);
}

function isObjectLike(value: any): boolean {
  return typeof value === 'object' && value !== null;
}

/**
 * Checks if `value` is a plain object.
 *
 * A plain object is an object created by the `Object`
 * constructor or with a `[[Prototype]]` of `null`.
 */
export function isPlainObject(value: any): boolean {
  if (!isObjectLike(value) || getTag(value) !== '[object Object]') {
    return false;
  }

  if (Object.getPrototypeOf(value) === null) {
    return true;
  }

  let proto = value;

  while (Object.getPrototypeOf(proto) !== null) {
    proto = Object.getPrototypeOf(proto);
  }

  return Object.getPrototypeOf(value) === proto;
}