/**
 * @name Clean Links
 * @description Points t.co links in posts straight at the destination X already shows in the link text, strips common tracking parameters (utm_*, fbclid, gclid, ...) and shows the full URL on hover. No extra requests.
 * @version 1.0.1
 * @author wayBetter
 * @permissions network:none
 */
const TRACKING = /^(utm_[a-z_]+|fbclid|gclid|dclid|gbraid|wbraid|msclkid|mc_cid|mc_eid|igshid|yclid|_hsenc|_hsmi|mkt_tok|ref_src|ref_url)$/i;

module.exports = class CleanLinks {
  start() {
    const api = window.wayBetter.api;
    this.scope = api.scope();
    this.scope.observe('[data-testid="tweetText"] a[href^="https://t.co/"], [data-testid="UserUrl"] a[href^="https://t.co/"], [data-testid="UserDescription"] a[href^="https://t.co/"]', link => this.clean(link));
  }

  stop() {
    this.scope.dispose();
    for (const link of document.querySelectorAll('a[data-bt-tco]')) {
      link.setAttribute('href', link.getAttribute('data-bt-tco'));
      link.removeAttribute('data-bt-tco');
      if (link.hasAttribute('data-bt-title')) {
        link.removeAttribute('title');
        link.removeAttribute('data-bt-title');
      }
    }
  }

  /** X renders the expanded URL as the link text (partly hidden, "…" when shortened). */
  destination(link) {
    const text = (link.textContent || '').replace(/…$/, '').trim();
    if (!/^https?:\/\/\S+$/.test(text)) return null;
    try {
      const url = new URL(text);
      for (const key of [...url.searchParams.keys()]) if (TRACKING.test(key)) url.searchParams.delete(key);
      return url.href;
    } catch {
      return null;
    }
  }

  clean(link) {
    const target = this.destination(link);
    if (!target) return;
    link.setAttribute('data-bt-tco', link.getAttribute('href'));
    link.setAttribute('href', target);
    if (!link.hasAttribute('title')) {
      link.setAttribute('title', target);
      link.setAttribute('data-bt-title', '');
    }
  }
};