import _ from 'underscore';
import {
  getSelector,
  togglePopover,
  inserted,
  mouseenter,
  mouseleave,
} from './feature_highlight_helper';

export function setupFeatureHighlightPopover(id, debounceTimeout = 300) {
  const $selector = $(getSelector(id));
  const $parent = $selector.parent();
  const $popoverContent = $parent.siblings('.feature-highlight-popover-content');
  const hideOnScroll = togglePopover.bind($selector, false);
  const debouncedMouseleave = _.debounce(mouseleave, debounceTimeout);

  $selector
    // Setup popover
    .data('content', $popoverContent.prop('outerHTML'))
    .popover({
      html: true,
      // Override the existing template to add custom CSS classes
      template: `
        <div class="popover feature-highlight-popover" role="tooltip">
          <div class="arrow"></div>
          <div class="popover-content"></div>
        </div>
      `,
    })
    .on('mouseenter', mouseenter)
    .on('mouseleave', debouncedMouseleave)
    .on('inserted.bs.popover', inserted)
    .on('show.bs.popover', () => {
      window.addEventListener('scroll', hideOnScroll);
    })
    .on('hide.bs.popover', () => {
      window.removeEventListener('scroll', hideOnScroll);
    })
    // Display feature highlight
    .removeAttr('disabled');
}

export function findHighestPriorityFeature() {
  let priorityFeature;

  const sortedFeatureEls = [].slice.call(document.querySelectorAll('.js-feature-highlight')).sort((a, b) =>
    (a.dataset.highlightPriority || 0) < (b.dataset.highlightPriority || 0));

  const [priorityFeatureEl] = sortedFeatureEls;
  if (priorityFeatureEl) {
    priorityFeature = priorityFeatureEl.dataset.highlight;
  }

  return priorityFeature;
}

export function highlightFeatures() {
  const priorityFeature = findHighestPriorityFeature();

  if (priorityFeature) {
    setupFeatureHighlightPopover(priorityFeature);
  }

  return priorityFeature;
}
