// ==UserScript==
// @name         Better Buzz Maths
// @namespace    https://greasyfork.org/users/1359538
// @version      1.0
// @description  Fixes the dumb math test images in Agilix Buzz so you can actually read them
// @author       Deniz
// @license      MIT
// @icon         https://www.google.com/s2/favicons?sz=64&domain=agilixbuzz.com
// @homepage     https://greasyfork.org/scripts/505681
// @match        https://legacy.agilixbuzz.com/student/*/activity/*
// @grant        none
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    const urlCheck = 'https://cdn.flvs.net/assessment_images/';

    function fixImg(img) {
        if (img.src.startsWith(urlCheck) && img.src.includes('math_')) {
            img.style.filter = 'invert(1)';
        }
    }

    const observer = new MutationObserver((mutationsList) => {
        for (const mut of mutationsList) {
            if (mut.type === 'childList') {
                for (const n of mut.addedNodes) {
                    if (n.tagName === 'IMG') {
                        fixImg(n);
                    }
                }
            }
        }
        document.querySelectorAll("img").forEach(fixImg);
    });

    observer.observe(document.body, {childList: true, subtree: true});
}());