Echo360 Video Speed Controller Fixer

Fixes an issue where the Video Speed Controller extension was not working on Echo360, and repositions the speed element to prevent overlap with existing elements for better visibility.

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// ==UserScript==
// @name         Echo360 Video Speed Controller Fixer
// @namespace    http://tampermonkey.net/
// @version      2025-11-06
// @description  Fixes an issue where the Video Speed Controller extension was not working on Echo360, and repositions the speed element to prevent overlap with existing elements for better visibility.
// @author       Integrace
// @match        https://echo360.org.uk/lesson/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=echo360.org.uk
// @grant        none
// @license MIT
// ==/UserScript==

(function () {
  'use strict';

  /**********************************************************
   * :one: Block playbackRate resets to 1.0x
   **********************************************************/
  const desc = Object.getOwnPropertyDescriptor(HTMLMediaElement.prototype, 'playbackRate');
  if (desc && desc.set && desc.get) {
    window.__blockEchoPlaybackRateReset = true;
    Object.defineProperty(HTMLMediaElement.prototype, 'playbackRate', {
      configurable: true,
      enumerable: desc.enumerable,
      get() {
        return desc.get.call(this);
      },
      set(value) {
        if (window.__blockEchoPlaybackRateReset && value === 1) return;
        return desc.set.call(this, value);
      },
    });
  }

  /**********************************************************
   * :two: Keep the #controller always shifted down
   **********************************************************/
  const MOVE_OFFSET = 35; // pixels downward

  function shiftController(controller) {
    if (!controller) return;
    if (controller.style.transform !== `translateY(${MOVE_OFFSET}px)`) {
      controller.style.transform = `translateY(${MOVE_OFFSET}px)`;
    }
  }

  function handleShadowHost(host) {
    if (!host || !host.shadowRoot) return;
    const shadow = host.shadowRoot;

    // Apply immediately if exists
    shiftController(shadow.getElementById('controller'));

    // Observe inside shadow DOM for controller creation / resets
    const innerObserver = new MutationObserver(() => {
      const ctrl = shadow.getElementById('controller');
      shiftController(ctrl);
    });
    innerObserver.observe(shadow, { childList: true, subtree: true, attributes: true });
  }

  function scanForHosts() {
    document.querySelectorAll('div.vsc-controller').forEach(handleShadowHost);
  }

  // Watch for new .vsc-controller elements in main DOM
  const outerObserver = new MutationObserver(() => scanForHosts());
  outerObserver.observe(document.documentElement, { childList: true, subtree: true });

  // Backup interval in case observers miss it (Echo360 can use detached shadow roots)
  setInterval(scanForHosts, 1000);
})();