// @flow
import type { ModifierArguments, Modifier } from '../types';
import getWindow from '../dom-utils/getWindow';

// eslint-disable-next-line import/no-unused-modules
export type Options = {
  scroll: boolean,
  resize: boolean,
};

const passive = { passive: true };

function effect({ state, instance, options }: ModifierArguments<Options>) {
  const { scroll = true, resize = true } = options;

  const window = getWindow(state.elements.popper);
  const scrollParents = [
    ...state.scrollParents.reference,
    ...state.scrollParents.popper,
  ];

  if (scroll) {
    scrollParents.forEach(scrollParent => {
      scrollParent.addEventListener('scroll', instance.update, passive);
    });
  }

  if (resize) {
    window.addEventListener('resize', instance.update, passive);
  }

  return () => {
    if (scroll) {
      scrollParents.forEach(scrollParent => {
        scrollParent.removeEventListener('scroll', instance.update, passive);
      });
    }

    if (resize) {
      window.removeEventListener('resize', instance.update, passive);
    }
  };
}

// eslint-disable-next-line import/no-unused-modules
export type EventListenersModifier = Modifier<'eventListeners', Options>;
export default ({
  name: 'eventListeners',
  enabled: true,
  phase: 'write',
  fn: () => {},
  effect,
  data: {},
}: EventListenersModifier);