Neopets - Lunar Temple Solver

// ==UserScript==
// @name         Neopets - Lunar Temple Solver
// @namespace    https://www.scriptneo.com/
// @version      0.5
// @description  It does the thing. Takes a few seconds.
// @author       Piotr Kardovsky
// @match        http*://www.neopets.com/shenkuu/lunar/?show=puzzle
// @match        http*://neopets.com/shenkuu/lunar/?show=puzzle
// @icon         https://www.neopets.com/favicon.ico
// @grant        none
// @license      MIT
// @downloadURL  https://www.scriptneo.com/scripts/download.php?id=4
// @updateURL    https://www.scriptneo.com/scripts/download.php?id=4
// ==/UserScript==

(function() {
    'use strict';
    // Set to true to autoclick. ~2 second delay to simulate "figuring it out".
    const AUTO = false;

    //    window.addEventListener('load', () => {
    if (document.querySelector('input[value="0"]') != undefined) {
        let angle = parseInt(swf.attributes.swf.match(/Kreludor=(\d+)/)[1]);
        let lnt = [11, 33, 56, 78, 101, 123, 146, 168, 191, 213, 236, 258, 281, 303, 326, 348, 360];
        let idx = lnt.findIndex((i) => {
            return angle <= i;
        });
        idx = idx == 16 ? 8 : idx < 8 ? idx + 8 : idx - 8;

        let ans = document.querySelector(`.content input[value="${idx}"]`);
        if (AUTO === true) {
            setTimeout(() => {
                ans.checked = true;
                document.querySelector('form[action="results.phtml"]').submit();
            }, 1800 + Math.random() * 600);
        } else {
            ans.parentNode.style.background = "#000";
        }
    }
    //    });
})();