/**
 * @license
 * Copyright 2020 The Go Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style
 * license that can be found in the LICENSE file.
 */

import { AccordionController } from './accordion.js';

/**
 * Instantiates accordian controller for the left sidebar and sets
 * the panel for the current location hash as active.
 */
const accordion = document.querySelector('.js-accordion');
if (accordion) {
  const accordionCtlr = new AccordionController(accordion);
  const activePanel =
    window.location.hash &&
    document.querySelector(`a[href=${JSON.stringify(window.location.hash)}]`);
  if (activePanel) {
    accordionCtlr.select(activePanel);
  }
}

/**
 * Event handlers for expanding and collapsing the readme section.
 */
const readme = document.querySelector('.js-readme');
const readmeExpand = document.querySelectorAll('.js-readmeExpand');
const readmeCollapse = document.querySelector('.js-readmeCollapse');
if (readmeExpand && readmeExpand && readmeCollapse) {
  readmeExpand.forEach(el =>
    el.addEventListener('click', e => {
      e.preventDefault();
      readme.classList.add('UnitReadme--expanded');
      readme.scrollIntoView();
    })
  );
  readmeCollapse.addEventListener('click', e => {
    e.preventDefault();
    readme.classList.remove('UnitReadme--expanded');
    readme.scrollIntoView();
  });
}