// ==UserScript==
// @name         Instagram s9e Stealthgram Link Inserter
// @namespace    https://stealthgram.com/
// @version      2025.08.16.2
// @description  Seamlessly insert Stealthgram links under Instagram embeds and Twstalker/xstalk/archive/nitter/etc. links under Twitter embeds (s9e), with duplicate prevention, spacing, and dynamic embed handling
// @match        *://*www.thecoli.com/threads/*
// @match        *://*/threads/*
// @grant        none
// ==/UserScript==

(function() {
  'use strict';

  const debug = false; // Set to true for console.log debugging
  function log(msg) { if (debug) console.log('[Stealthgram userscript]', msg); }

  // =========================
  // Instagram support
  // =========================
  function getInstagramMediaId(iframe) {
    if (!iframe || !iframe.src) return null;
    const match = iframe.src.match(/#([A-Za-z0-9_-]{5,})/);
    return match ? match[1] : null;
  }

  function insertStealthgramLink(iframe, mediaId) {
    if (!iframe || !mediaId) return;
    if (iframe.getAttribute('data-stealthgram-done')) return;

    // Add spacing
    const br1 = document.createElement('br');
    const br2 = document.createElement('br');
    const link = document.createElement('a');
    link.href = 'https://stealthgram.com/media/' + mediaId;
    link.textContent = 'Stealthgram link';
    link.target = '_blank';
    link.rel = 'noopener noreferrer';
    link.className = 'stealthgram-link';
    link.style = 'font-size:90%;font-family:monospace;text-decoration:underline;';

    iframe.insertAdjacentElement('afterend', br1);
    br1.insertAdjacentElement('afterend', link);
    link.insertAdjacentElement('afterend', br2);

    iframe.setAttribute('data-stealthgram-done', '1');
    log('Inserted Stealthgram link for ' + mediaId);
  }

  // =========================
  // Twitter support
  // =========================
  function createTwitterLinks(tweetId) {
    const baseTwitter = `https://twitter.com/undefined/status/${tweetId}`;
    const baseTwstalker = `https://twstalker.com/undefined/status/${tweetId}`;
    const baseXstalk = `https://xstalk.com/profile/undefined/status/${tweetId}`;
    const baseXcancel = `https://xcancel.com/undefined/status/${tweetId}`;
    const baseNitter = `https://nitter.poast.org/undefined/status/${tweetId}`;

    return {
      twstalker: baseTwstalker,
      archiveOrgSave: `https://web.archive.org/save/${baseTwstalker}`,
      archiveIs: `https://archive.is/?run=1&url=${baseTwstalker}`,
      xstalk: baseXstalk,
      xstalkSave: `https://web.archive.org/save/${baseXstalk}`,
      archiveIsXstalk: `https://archive.is/?run=1&url=${baseXstalk}`,
      archiveIsX: `https://archive.is/?run=1&url=${baseTwitter}`,
      nitter: baseNitter,
      xcancel: baseXcancel,
      xcancelSave: `https://archive.is/?run=1&url=${baseXcancel}`
    };
  }

  function insertTwitterLinks(iframe, tweetId) {
    if (!iframe || !tweetId) return;
    if (iframe.getAttribute('data-twstalker-done')) return;

    const links = createTwitterLinks(tweetId);
    const container = document.createElement('div');
    container.style = 'font-size:90%;font-family:monospace;';
    container.innerHTML = `
      <a href="${links.twstalker}" target="_blank" style="text-decoration:underline;">twstalker</a> |
      <a href="${links.archiveOrgSave}" target="_blank" style="text-decoration:underline;">archive.org(save)</a> |
      <a href="${links.archiveIs}" target="_blank" style="text-decoration:underline;">archive.is</a> |
      <a href="${links.xstalk}" target="_blank" style="text-decoration:underline;">xstalk</a> |
      <a href="${links.xstalkSave}" target="_blank" style="text-decoration:underline;">xstalk(save)</a> |
      <a href="${links.archiveIsXstalk}" target="_blank" style="text-decoration:underline;">archive.is(xstalk)</a> |
      <a href="${links.archiveIsX}" target="_blank" style="text-decoration:underline;">archive.is(X)</a> |
      <a href="${links.nitter}" target="_blank" style="text-decoration:underline;">nitter</a> |
      <a href="${links.xcancel}" target="_blank" style="text-decoration:underline;">xcancel</a> |
      <a href="${links.xcancelSave}" target="_blank" style="text-decoration:underline;">xcancel(save)</a>
    `;

    // Add spacing
    const br1 = document.createElement('br');
    const br2 = document.createElement('br');
    iframe.insertAdjacentElement('afterend', br1);
    br1.insertAdjacentElement('afterend', container);
    container.insertAdjacentElement('afterend', br2);

    iframe.setAttribute('data-twstalker-done', '1');
    log('Inserted Twstalker/xstalk/etc links for tweet ' + tweetId);
  }

  function getTweetId(iframe) {
    if (!iframe || !iframe.src) return null;
    const match = iframe.src.match(/#(\d{5,})/);
    return match ? match[1] : null;
  }

  // =========================
  // Processing
  // =========================
  let throttleTimeout;
  function processEmbeds() {
    if (throttleTimeout) return;
    throttleTimeout = setTimeout(() => {
      throttleTimeout = null;

      // Instagram
      const igEmbeds = document.querySelectorAll('iframe[data-s9e-mediaembed="instagram"]');
      for (let iframe of igEmbeds) {
        const mediaId = getInstagramMediaId(iframe);
        if (mediaId) insertStealthgramLink(iframe, mediaId);
      }

      // Twitter
      const twEmbeds = document.querySelectorAll('iframe[data-s9e-mediaembed="twitter"]');
      for (let iframe of twEmbeds) {
        const tweetId = getTweetId(iframe);
        if (tweetId) insertTwitterLinks(iframe, tweetId);
      }
    }, 200);
  }

  processEmbeds();

  const observer = new MutationObserver(() => { processEmbeds(); });
  observer.observe(document.body, {childList: true, subtree: true});

  log('Instagram + Twitter userscript loaded.');
})();