// ==UserScript==
// @name         BRFC stream sniffer
// @namespace    local.brfc.archive
// @version      0.4
// @description  Capture the manifest URL the player requests, and trace the API call that mints its token.
// @match        *://*.bristolrovers.co.uk/*
// @match        *://*.streamamg.com/*
// @match        *://*.streamamg.co.uk/*
// @match        *://*.kaltura.com/*
// @match        *://*.kaltura.co.uk/*
// @match        *://*.akamaized.net/*
// @match        *://*.akamaihd.net/*
// @noframes     false
// @run-at       document-start
// @grant        GM_xmlhttpRequest
// @connect      127.0.0.1
// ==/UserScript==

(function () {
  'use strict';

  const CATCHER = 'http://127.0.0.1:8787/stream';
  const TRACER  = 'http://127.0.0.1:8787/trace';

  // Discovery mode: record the request/response chain that produces a stream
  // URL, so the token mint can be replayed without a GUI browser. Set false
  // once the endpoint is known -- it writes a lot.
  const TRACE = true;

  // Start playback without a human. The player needs a click, but the browser
  // only has to trigger the manifest fetch -- ffmpeg records the real audio
  // independently, so playing MUTED costs nothing and muted autoplay is
  // permitted by Firefox policy where audible autoplay is not.
  const AUTOPLAY = true;
  const AUTOPLAY_TIMEOUT_MS = 180000;   // pre-match margin is long; keep trying

  const IDLE_OPACITY = 0.063;   // 16/255
  const MAX_BODY = 20000;       // never log a whole media segment

  console.log('[brfc-sniffer] v0.4 active in frame:', location.href);

  const seen = new Map();

  const isManifest = u => typeof u === 'string' && /\.m3u8(\?|$)/i.test(u);
  // Media and assets are noise. Everything else is a mint-call candidate.
  const isNoise = u => /\.(ts|mp4|m4s|aac|jpe?g|png|gif|webp|svg|woff2?|css)(\?|$)/i.test(u);

  function post(endpoint, payload) {
    try {
      GM_xmlhttpRequest({
        method: 'POST',
        url: endpoint,
        headers: { 'Content-Type': 'application/json' },
        data: JSON.stringify(payload),
        onerror: () => {}
      });
    } catch (e) { /* catcher not running; never break the page */ }
  }

  function record(url, via) {
    let abs = url;
    if (!/^https?:/i.test(url)) {
      try { abs = new URL(url, location.href).href; } catch (e) { /* keep raw */ }
    }
    if (seen.has(abs)) return;
    seen.set(abs, { url: abs, via });
    console.log('[brfc-sniffer]', via, abs);
    render();
    post(CATCHER, {
      url: abs, via, page: location.href,
      userAgent: navigator.userAgent, ts: new Date().toISOString()
    });
  }

  // The mint call is identified by what it RETURNS, not by its name. Any
  // response mentioning m3u8 is a candidate, whatever the endpoint is called.
  function trace(entry, bodyText) {
    if (!TRACE) return;
    const mints = !!bodyText && /m3u8/i.test(bodyText);
    if (!mints && !/api|token|entitle|session|auth|manifest|playback|licen/i.test(entry.url)) return;
    entry.mintsManifest = mints;
    entry.body = bodyText ? bodyText.slice(0, MAX_BODY) : null;
    entry.page = location.href;
    entry.ts = new Date().toISOString();
    if (mints) console.log('[brfc-sniffer] *** MINT CALL ***', entry.method, entry.url);
    post(TRACER, entry);
  }

  // --- fetch ----------------------------------------------------------------
  const _fetch = window.fetch;
  if (_fetch) {
    window.fetch = function (input, init) {
      let url = null, method = 'GET';
      try {
        url = (typeof input === 'string') ? input : (input && input.url) || null;
        method = (init && init.method) || (input && input.method) || 'GET';
        if (isManifest(url)) record(url, 'fetch');
      } catch (e) { /* ignore */ }

      const p = _fetch.apply(this, arguments);
      if (TRACE && url && !isNoise(url)) {
        p.then(resp => {
          try {
            const reqBody = (init && typeof init.body === 'string')
              ? init.body.slice(0, MAX_BODY) : null;
            resp.clone().text().then(
              t => trace({ via: 'fetch', method, url, status: resp.status, reqBody }, t),
              () => {}
            );
          } catch (e) { /* ignore */ }
        }, () => {});
      }
      return p;
    };
  }

  // --- XHR ------------------------------------------------------------------
  const _open = XMLHttpRequest.prototype.open;
  const _send = XMLHttpRequest.prototype.send;

  XMLHttpRequest.prototype.open = function (method, url) {
    try {
      this.__brfc = { method: method, url: url };
      if (isManifest(url)) record(url, 'xhr');
    } catch (e) { /* ignore */ }
    return _open.apply(this, arguments);
  };

  XMLHttpRequest.prototype.send = function (body) {
    try {
      const info = this.__brfc;
      if (TRACE && info && info.url && !isNoise(info.url)) {
        const reqBody = (typeof body === 'string') ? body.slice(0, MAX_BODY) : null;
        this.addEventListener('load', () => {
          let text = null;
          try {
            if (this.responseType === '' || this.responseType === 'text') {
              text = this.responseText;
            }
          } catch (e) { /* binary response */ }
          trace({ via: 'xhr', method: info.method, url: info.url,
                  status: this.status, reqBody: reqBody }, text);
        });
      }
    } catch (e) { /* ignore */ }
    return _send.apply(this, arguments);
  };

  // --- <video src> ----------------------------------------------------------
  const _setAttr = Element.prototype.setAttribute;
  Element.prototype.setAttribute = function (name, value) {
    try {
      if (/^src$/i.test(name) && isManifest(value)) record(value, 'attr');
    } catch (e) { /* ignore */ }
    return _setAttr.apply(this, arguments);
  };

  // --- panel ----------------------------------------------------------------
  let panel;
  function render() {
    if (window.top !== window.self) return;
    if (!panel) {
      panel = document.createElement('div');
      panel.style.cssText = [
        'position:fixed', 'right:12px', 'bottom:12px', 'z-index:2147483647',
        'max-width:min(560px,90vw)', 'max-height:40vh', 'overflow:auto',
        'background:#101418', 'color:#e6edf3',
        'font:12px/1.45 ui-monospace,Menlo,Consolas,monospace',
        'border:1px solid #2b333c', 'border-radius:8px', 'padding:10px 12px',
        'box-shadow:0 8px 24px rgba(0,0,0,.45)',
        'opacity:' + IDLE_OPACITY,
        'transition:opacity .18s ease'
      ].join(';');
      panel.addEventListener('mouseenter', () => { panel.style.opacity = '1'; });
      panel.addEventListener('mouseleave', () => { panel.style.opacity = String(IDLE_OPACITY); });
      (document.body || document.documentElement).appendChild(panel);
    }
    panel.innerHTML = '<b style="color:#5ac8fa">BRFC sniffer v0.4</b> '
      + seen.size + ' manifest(s)'
      + (TRACE ? ' <span style="color:#e3b341">[tracing]</span>' : '') + '<br>';
    for (const rec of seen.values()) {
      const row = document.createElement('div');
      row.style.cssText = 'margin-top:8px;word-break:break-all;'
        + 'border-top:1px solid #2b333c;padding-top:6px';
      const btn = document.createElement('button');
      btn.textContent = 'copy';
      btn.style.cssText = 'margin-right:8px;cursor:pointer;background:#1f6feb;'
        + 'color:#fff;border:0;border-radius:4px;padding:2px 8px';
      btn.onclick = () => navigator.clipboard.writeText(rec.url).then(() => {
        btn.textContent = 'copied';
        setTimeout(() => { btn.textContent = 'copy'; }, 1200);
      });
      row.appendChild(btn);
      row.appendChild(document.createTextNode('[' + rec.via + '] ' + rec.url));
      panel.appendChild(row);
    }
  }

  // --- autoplay -------------------------------------------------------------
  // Runs in whichever frame owns the <video>, which may be the player iframe.
  function findVideo() {
    const v = document.querySelector('video');
    return (v && v.isConnected) ? v : null;
  }

  function clickPlayButton() {
    const sels = [
      '.bmpui-ui-hugeplaybacktogglebutton',   // Bitmovin centre button
      '.bmpui-ui-playbacktogglebutton',       // Bitmovin control bar
      'button[aria-label*="play" i]',
      '[class*="play-button"]', '[class*="playButton"]'
    ];
    for (const s of sels) {
      const el = document.querySelector(s);
      if (el && el.offsetParent !== null) {   // must be visible to be real
        el.click();
        console.log('[brfc-sniffer] autoplay: clicked', s);
        return true;
      }
    }
    return false;
  }

  function startAutoplay() {
    if (!AUTOPLAY) return;
    const deadline = Date.now() + AUTOPLAY_TIMEOUT_MS;

    const timer = setInterval(() => {
      const v = findVideo();

      // Done once something is actually playing. Critically, we must stop
      // here: the play control is a TOGGLE, so clicking it again would pause
      // playback and silently end the recording.
      if (v && !v.paused && !v.ended && v.readyState > 2) {
        console.log('[brfc-sniffer] autoplay: playing, standing down');
        clearInterval(timer);
        return;
      }
      if (Date.now() > deadline) {
        console.log('[brfc-sniffer] autoplay: gave up after',
                    AUTOPLAY_TIMEOUT_MS / 1000, 's');
        clearInterval(timer);
        return;
      }

      if (v) {
        v.muted = true;               // audible autoplay is blocked; muted is not
        const p = v.play();
        if (p && p.catch) p.catch(() => { clickPlayButton(); });
      } else {
        clickPlayButton();            // player chrome may exist before <video>
      }
    }, 2000);
  }

  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', startAutoplay);
  } else {
    startAutoplay();
  }
})();