// ==UserScript==
// @run-at document-start
// @name Zero Out YT Timestamp
// @description Prompts to zero out any youtube.com timestamp upon load, might be helpful for certain situations.
// @author Chris Lowles
// @version 2025.10.10
// @updateURL https://raw.githubusercontent.com/chrislowles/userscripts/main/zero-out-yt-timestamp.user.js
// @downloadURL https://raw.githubusercontent.com/chrislowles/userscripts/main/zero-out-yt-timestamp.user.js
// @match http*://www.youtube.com/*
// ==/UserScript==

let prevURL = '';
new MutationObserver(mutations => {
	if (location.href !== prevURL) {
		prevURL = location.href;
		if (
			window.location.pathname == "/watch" &&
			new URL(window.location.href).searchParams.get("t").replace("s", "") > 0
		) {
			if (confirm("We detected you have a timestamp in this video, do you want to clear it out and start from the beginning?") == true) {
				let url = new URL(window.location.href);
				let params = new URLSearchParams(url.search);
				params.set('t', 0);
				window.location.search = `?${params.toString()}`;
			} else {
				return false;
			}
		}
	}
}).observe(document, {
  subtree: true,
  childList: true
});