/*
 * This file is part of ORY Editor.
 *
 * ORY Editor is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ORY Editor is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with ORY Editor.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @license LGPL-3.0
 * @copyright 2016-2018 Aeneas Rekkas
 * @author Aeneas Rekkas <aeneas+oss@aeneas.io>
 *
 */

import equals from 'ramda/src/equals';

export const shouldPureComponentUpdate = function(next: Object) {
  const filterFunctions = (o: Object) => (key: string) =>
    typeof o[key] !== 'function';
  const prevKeys = Object.keys(next).filter(filterFunctions(next));
  // eslint-disable-next-line no-invalid-this
  const nextKeys = Object.keys(this.props).filter(filterFunctions(this.props));

  if (!equals(nextKeys, prevKeys)) {
    // console.log('Keys are mismatching', nextKeys, prevKeys)
    return true;
  }

  // eslint-disable-next-line no-invalid-this
  const changed = nextKeys.filter(
    (key: string) => !equals(next[key], this.props[key])
  );

  // if (changed.length > 0) {
  //   console.log('There have been at least one changed fields: ', changed.map((c) => ({
  //     key: c,
  //     now: this.props[c],
  //     next: next[c]
  //   })))
  // } else {
  //   console.log('No changes deteced, skipping render.')
  // }

  return changed.length > 0;
};