import $ from 'jquery';
import axios from './lib/utils/axios_utils';
import flash from './flash';
import { mouseenter, debouncedMouseleave, togglePopover } from './shared/popover';

export default class Milestone {
  constructor() {
    this.bindTabsSwitching();

    // Load merge request tab if it is active
    // merge request tab is active based on different conditions in the backend
    this.loadTab($('.js-milestone-tabs .active a'));

    this.loadInitialTab();
  }

  bindTabsSwitching() {
    return $('a[data-toggle="tab"]').on('show.bs.tab', (e) => {
      const $target = $(e.target);

      window.location.hash = $target.attr('href');
      this.loadTab($target);
    });
  }
  // eslint-disable-next-line class-methods-use-this
  loadInitialTab() {
    const $target = $(`.js-milestone-tabs a[href="${window.location.hash}"]`);

    if ($target.length) {
      $target.tab('show');
    }
  }
  // eslint-disable-next-line class-methods-use-this
  loadTab($target) {
    const endpoint = $target.data('endpoint');
    const tabElId = $target.attr('href');

    if (endpoint && !$target.hasClass('is-loaded')) {
      axios.get(endpoint)
        .then(({ data }) => {
          $(tabElId).html(data.html);
          $target.addClass('is-loaded');
        })
        .catch(() => flash('Error loading milestone tab'));
    }
  }

  static initDeprecationMessage() {
    const deprecationMesssageContainer = document.querySelector('.js-milestone-deprecation-message');

    if (!deprecationMesssageContainer) return;

    const deprecationMessage = deprecationMesssageContainer.querySelector('.js-milestone-deprecation-message-template').innerHTML;
    const $popover = $('.js-popover-link', deprecationMesssageContainer);
    const hideOnScroll = togglePopover.bind($popover, false);

    $popover.popover({
      content: deprecationMessage,
      html: true,
      placement: 'bottom',
    })
    .on('mouseenter', mouseenter)
    .on('mouseleave', debouncedMouseleave())
    .on('show.bs.popover', () => {
      window.addEventListener('scroll', hideOnScroll, { once: true });
    });
  }
}