Quizlet Learn Auto Answer

Automatically detects and answers every question in Quizlet Learn mode in real time. Highlights the correct answer in green for multiple choice questions and auto-fills and submits written questions instantly.
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// ==UserScript==
// @name         Quizlet Learn Auto Answer
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Automatically detects and answers every question in Quizlet Learn mode in real time. Highlights the correct answer in green for multiple choice questions and auto-fills and submits written questions instantly.
// @author       apzn
// @license      MIT
// @match        https://quizlet.com/*
// @grant        unsafeWindow
// @run-at       document-idle
// ==/UserScript==

const win = unsafeWindow;

const observer = new MutationObserver(() => {
    if (win.document.querySelector('article')) {
        observer.disconnect();
        setInterval(() => {
            try {
                const element = win.document.querySelector('article');
                if (!element) return;

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

                    const input = win.document.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 }));
                        setTimeout(() => {
                            const form = win.document.querySelector('form');
                            if (form) form.dispatchEvent(new Event('submit', { bubbles: true }));
                            const btn = win.document.querySelector('form button[type="submit"], form button');
                            if (btn) btn.click();
                        }, 300);
                    }
                }
            } catch(e) { console.log('Script error:', e.message); }
        }, 100);
    }
});

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