// ==UserScript==
// @name         YT - Old design
// @namespace    4c5725cd7d4b94b6f1784e759d5a43fbdd917971
// @version      0.2
// @description  Activates the old YouTube design without messing with your other settings
// @author       /u/AyrA_ch
// @match        https://www.youtube.com/*
// @match        http://www.youtube.com/*
// @match        https://youtube.com/*
// @match        http://youtube.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

// Changelog
// 0.2 Changed title to match other scripts
// 0.1 Initial Version

(function () {
	var getDesignCookie = function (cookie) {
		//Find existing preferences
		var prefs = cookie.split("; ").filter(function (v) {
				return v.indexOf("PREF=") === 0;
			})[0];
		//No preferences, return new ones with design setting
		if (!prefs) {
			console.log("prefs not set in cookie");
			return "PREF=f6=8";
		}
		//Process all settings
		var entries = prefs.substr(5).split('&');
		var set = false;
		for (var i = 0; i < entries.length; i++) {
			if (entries[i].indexOf("f6=") === 0) {
				set = true;
				//Set the old design flag
				var value = +entries[i].substr(3);
				if ((value & 8) === 0) {
					console.log("Activating old design and reloading...");
					entries[i] = "f6=" + (value | 8);
					window.setTimeout(location.reload.bind(location,true),100);
				}
				else{
					console.log("Old design already active. Doing nothing");
				}
			}
		}
		//Design flag setting doesn't exists. Adding it instead
		if (!set) {
			console.log("Activating old design and reloading...");
			entries.push("f6=8");
			window.setTimeout(location.reload.bind(location,true),100);
		}
		//Build cookie
		return "PREF=" + entries.join('&');
	};
	//Update cookie
	document.cookie = getDesignCookie(document.cookie) + ";domain=.youtube.com;path=/";
})();