import { parseClassList } from './utils';

const setDropdownMenuState = (menu: HTMLElement, isOpen: boolean): void => {
  // data attributes store the class lists to add/remove
  const openClasses = parseClassList(menu.getAttribute('data-dropdown-open-classes'));
  const closedClasses = parseClassList(menu.getAttribute('data-dropdown-closed-classes'));

  if (isOpen) {
    menu.classList.remove(...closedClasses);
    menu.classList.add(...openClasses);
    return;
  }

  menu.classList.remove(...openClasses);
  menu.classList.add(...closedClasses);
};

const setWatchlistDropdownState = (isOpen: boolean): void => {
  const dropdown = document.getElementById('watchlist-dropdown');
  if (!dropdown) {
    return;
  }

  dropdown.classList.toggle('open', isOpen);
  const menu = dropdown.querySelector('[data-dropdown-menu]');
  if (menu instanceof HTMLElement) {
    setDropdownMenuState(menu, isOpen);
  }
};

const toggleWatchlistDropdown = (): void => {
  const dropdown = document.getElementById('watchlist-dropdown');
  if (!dropdown) {
    return;
  }

  setWatchlistDropdownState(!dropdown.classList.contains('open'));
};

const closeDropdownOnOutsideClick = (event: MouseEvent): void => {
  const dropdown = document.getElementById('watchlist-dropdown');
  if (!dropdown) {
    return;
  }

  const target = event.target;
  if (!(target instanceof Node)) {
    return;
  }

  if (!dropdown.contains(target)) {
    setWatchlistDropdownState(false);
  }
};

const initWatchlistDropdown = (): void => {
  (window as Window & { toggleDropdown?: () => void }).toggleDropdown = toggleWatchlistDropdown;
  document.addEventListener('click', closeDropdownOnOutsideClick);
};

initWatchlistDropdown();