"use strict";

const NON_ENUMERABLE = require("../native/NON_ENUMERABLE");

const isSymbol = require("../is/symbol");

const uniq = require("../array/uniq");

const concatMutate = require("../array/concatMutate");

const forProto = require("../loop/each/forProto");

const keys = require("./keys");

const getOwnPropertyNames = Object.getOwnPropertyNames;
const getOwnPropertySymbols = Object.getOwnPropertySymbols;
/**
 * @desc properties, property symbols, object keys
 *       ^ all again for prototype
 * @memberOf util
 * @since 3.0.0
 * @version 5.0.0-beta.4 only used in gc (as of 5.0.0-beta.4)
 *
 * @param  {Object} obj object to get properties & symbols from
 * @return {Array<string>} properties
 *
 * @see deps/gc
 * @see deps/utils/nonEnumerableTypes
 * @see http://2ality.com/2011/07/js-properties.html
 * @TODO https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptors
 * `const getOwnPropertyDescriptors = Object.getOwnPropertyDescriptors`
 *
 * @example
 *    var obj = {key: true}
 *    allProperties(obj)
 *    //=> ['key']
 *
 * @example
 *    class One {
 *      method() {}
 *    }
 *    class Two extends One {
 *      eh() {}
 *    }
 *    allProperties(new Two())
 *    //=> ['eh', 'method']
 *
 */

function allProperties(obj) {
  // .concat(keys(obj)) ?
  return getOwnPropertyNames(obj).concat(getOwnPropertySymbols(obj)).concat(keys(obj)); // const result = []
  // for (const prop in obj) result.push(prop)
  // return result
  // flatten(getOwnPropertyNames, getOwnPropertySymbols)
  // const proto = getPrototypeOf(obj)
  // return [].concat(
  //   getOwnPropertyNames(obj),
  //   getOwnPropertySymbols(obj)
  //   // ObjectKeys(obj),
  //   // proto ? allProperties(proto) : []
  // )
} // @TODO @HACK @FIXME - needs to be in another file


const NON_ASSIGNABLE = NON_ENUMERABLE.concat(['length', 'name']);

function walkAllProperties(obj, max = 1) {
  let props = allProperties(obj);
  forProto(obj, proto => concatMutate(props, allProperties(proto)), max);
  return props.filter(key => !NON_ASSIGNABLE.includes(key)).filter(uniq);
}

const BUILT_IN_METHODS = NON_ASSIGNABLE.concat(['apply', 'bind', 'call']);

const BUILT_IN_FILTER = key => {
  return !BUILT_IN_METHODS.includes(key) && !isSymbol(key) && key && !key.startsWith('$');
};

function walkAllCustomProperties(obj, max = 1) {
  let props = allProperties(obj); // const iteratee = proto => {
  //   props = props.concat(allProperties(proto))
  // }
  // forProto(obj, iteratee, max)

  return props.filter(BUILT_IN_FILTER).filter(uniq);
}

module.exports = walkAllCustomProperties;