import { ajax } from 'discourse/lib/ajax';
import DiscourseURL from 'discourse/lib/url';
import { wantsNewWindow } from 'discourse/lib/intercept-click';
import { selectedText } from 'discourse/lib/utilities';

export function isValidLink($link) {
  return ($link.hasClass("track-link") ||
          $link.closest('.hashtag,.badge-category,.onebox-result,.onebox-body').length === 0);
};

export default {
  trackClick(e) {
    // cancel click if triggered as part of selection.
    if (selectedText() !== "") { return false; }

    const $link = $(e.currentTarget);

    // don't track
    //   - lightboxes
    //   - group mentions
    //   - links with disabled tracking
    //   - category links
    //   - quote back button
    if ($link.is('.lightbox, .mention-group, .no-track-link, .hashtag, .back')) {
      return true;
    }

    // don't track links in quotes or in elided part
    let tracking = $link.parents('aside.quote,.elided').length === 0;

    let href = $link.attr('href') || $link.data('href');

    if (!href || href.trim().length === 0) { return false; }
    if (href.indexOf('mailto:') === 0) { return true; }

    const $article = $link.closest('article:not(.onebox-body), .excerpt, #revisions');
    const postId = $article.data('post-id');
    const topicId = $('#topic').data('topic-id') || $article.data('topic-id');
    const userId = $link.data('user-id') || $article.data('user-id');
    const ownLink = userId && (userId === Discourse.User.currentProp('id'));

    let destUrl = href;

    if (tracking) {

      destUrl = Discourse.getURL('/clicks/track?url=' + encodeURIComponent(href));

      if (postId && !$link.data('ignore-post-id')) {
        destUrl += "&post_id=" + encodeURI(postId);
      }
      if (topicId) {
        destUrl += "&topic_id=" + encodeURI(topicId);
      }

      // Update badge clicks unless it's our own
      if (!ownLink) {
        const $badge = $('span.badge', $link);
        if ($badge.length === 1) {
          // don't update counts in category badge nor in oneboxes (except when we force it)
          if (isValidLink($link)) {
            const html = $badge.html();
            const key = `${new Date().toLocaleDateString()}-${postId}-${href}`;
            if (/^\d+$/.test(html) && !sessionStorage.getItem(key)) {
              sessionStorage.setItem(key, true);
              $badge.html(parseInt(html, 10) + 1);
            }
          }
        }
      }
    }

    // If they right clicked, change the destination href
    if (e.which === 3) {
      $link.attr('href', Discourse.SiteSettings.track_external_right_clicks ? destUrl : href);
      return true;
    }

    // if they want to open in a new tab, do an AJAX request
    if (tracking && wantsNewWindow(e)) {
      ajax("/clicks/track", {
        data: {
          url: href,
          post_id: postId,
          topic_id: topicId,
          redirect: false
        },
        dataType: 'html'
      });
      return true;
    }

    e.preventDefault();

    // Remove the href, put it as a data attribute
    if (!$link.data('href')) {
      $link.addClass('no-href');
      $link.data('href', $link.attr('href'));
      $link.attr('href', null);
      // Don't route to this URL
      $link.data('auto-route', true);
    }

    // restore href
    setTimeout(() => {
      $link.removeClass('no-href');
      $link.attr('href', $link.data('href'));
      $link.data('href', null);
    }, 50);

    // warn the user if they can't download the file
    if (Discourse.SiteSettings.prevent_anons_from_downloading_files && $link.hasClass("attachment") && !Discourse.User.current()) {
      bootbox.alert(I18n.t("post.errors.attachment_download_requires_login"));
      return false;
    }

    // If we're on the same site, use the router and track via AJAX
    if (tracking && DiscourseURL.isInternal(href) && !$link.hasClass('attachment')) {
      ajax("/clicks/track", {
        data: {
          url: href,
          post_id: postId,
          topic_id: topicId,
          redirect: false
        },
        dataType: 'html'
      });
      DiscourseURL.routeTo(href);
      return false;
    }

    // Otherwise, use a custom URL with a redirect
    // consider CTRL+mouse-left-click / CMD+mouse-left-click or mouse-middle-click as well
    if (Discourse.User.currentProp('external_links_in_new_tab') || ((e.ctrlKey || e.metaKey) && (e.which === 1)) || (e.which === 2)) {
      window.open(destUrl, '_blank').focus();
    } else {
      DiscourseURL.redirectTo(destUrl);
    }

    return false;
  }
};