Quizlet Test Auto Answer

Automatically highlights and selects the correct answer for every question on Quizlet test mode. Supports multiple choice and written question types. Works across all questions simultaneously.
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// ==UserScript==
// @name         Quizlet Test Auto Answer
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Automatically highlights and selects the correct answer for every question on Quizlet test mode. Supports multiple choice and written question types. Works across all questions simultaneously.
// @author       apzn
// @license      MIT
// @match        https://quizlet.com/*
// @grant        unsafeWindow
// @run-at       document-idle
// ==/UserScript==

const win = unsafeWindow;

function runOnArticles() {
    win.document.querySelectorAll('article').forEach(element => {
        const fiberKey = Object.keys(element).find(k => k.startsWith('__reactFiber$'));
        if (!fiberKey) return;

        let node = element[fiberKey];
        let question = null;
        while (node) {
            if (node.memoizedProps?.question?.type) {
                question = node.memoizedProps.question;
                break;
            }
            node = node.return;
        }
        if (!question) return;

        if (question.type === 'MultipleChoiceQuestion') {
            const answerIndex = question.metadata.optionGenerationSource.findIndex(k => k === 'key');
            const container = element.querySelector('[data-testid="MCQ Answers"]');
            if (!container) return;

            const wrapper = container.children[answerIndex];
            if (!wrapper) return;

            const answerText = wrapper.querySelector('section > :nth-child(2)');
            if (answerText && answerText.style.color === 'lime') return;

            [...container.children].forEach(child => {
                const sec = child.querySelector('section > :nth-child(2)');
                if (sec) sec.style.color = '';
            });
            if (answerText) answerText.style.color = 'lime';

            const section = wrapper.querySelector('section') || wrapper;
            if (section) {
                const rect = section.getBoundingClientRect();
                section.dispatchEvent(new PointerEvent('pointerdown', { bubbles: true, clientX: rect.x + 10, clientY: rect.y + 10 }));
                section.dispatchEvent(new PointerEvent('pointerup', { bubbles: true, clientX: rect.x + 10, clientY: rect.y + 10 }));
                section.dispatchEvent(new MouseEvent('click', { bubbles: true, clientX: rect.x + 10, clientY: rect.y + 10 }));
            }

        } else if (question.type === 'WrittenQuestion') {
            if (typeof win.__NEXT_DATA__ === 'undefined') return;
            const allCards = win.__NEXT_DATA__.props.pageProps.studyModesCommon.studiableDocumentData.studiableItems;
            const card = allCards.find(c => c.id === question.metadata.studiableItemId);
            if (!card) return;
            const otherSide = card.cardSides[question.metadata.answerSide === 'definition' ? 1 : 0];
            const answer = otherSide.media[0].plainText;

            const existing = element.querySelector('#x-answer');
            if (existing) return;
            const form = element.querySelector('form');
            if (form) form.parentElement.insertAdjacentHTML('afterbegin', `<p style="color:lime;padding-bottom:10px;" id="x-answer">correct answer: ${answer}</p>`);

            const input = element.querySelector('form input, form textarea');
            if (input && input.value !== answer) {
                const setter = Object.getOwnPropertyDescriptor(win.HTMLInputElement.prototype, 'value')?.set
                    || Object.getOwnPropertyDescriptor(win.HTMLTextAreaElement.prototype, 'value')?.set;
                setter.call(input, answer);
                input.dispatchEvent(new Event('input', { bubbles: true }));
            }
        }
    });
}

const observer = new MutationObserver(() => {
    if (win.document.querySelector('article')) {
        setInterval(runOnArticles, 100);
        observer.disconnect();
    }
});

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