// ==UserScript==
// @name        Submit Click (F12) + Copy CURRENT Visible Question (F10)
// @namespace   vm-submit-click-and-copy-visible-text
// @match       https://*netacad.com/*
// @require     https://cdn.jsdelivr.net/npm/@violentmonkey/shortcut@1
// @grant       none
// @version     2.0
// @run-at      document-end
// ==/UserScript==

(function () {
    'use strict';

    // ────────────────────────────────────────────────
    //  Submit button click (F12) – unchanged
    // ────────────────────────────────────────────────
    function findSubmitButton() {
        let btns = document.querySelectorAll('button[aria-label="submit"].submit-button');
        for (const btn of btns) {
            const innerDiv = btn.querySelector('div.submit');
            if (innerDiv && innerDiv.textContent.trim() === 'Submit') return btn;
        }

        function searchShadows(root) {
            const walker = document.createTreeWalker(root, NodeFilter.SHOW_ELEMENT);
            let node;
            while ((node = walker.nextNode())) {
                if (node.shadowRoot) {
                    const shadowBtns = node.shadowRoot.querySelectorAll('button[aria-label="submit"].submit-button');
                    for (const btn of shadowBtns) {
                        const innerDiv = btn.querySelector('div.submit');
                        if (innerDiv && innerDiv.textContent.trim() === 'Submit') return btn;
                    }
                    const found = searchShadows(node.shadowRoot);
                    if (found) return found;
                }
            }
            return null;
        }

        return searchShadows(document.body);
    }

    function triggerSubmitClick() {
        const btn = findSubmitButton();
        if (!btn) return false;
        try { btn.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true, view: window })); } catch {}
        if (btn.click) try { btn.click(); } catch {}
        return true;
    }

    // ────────────────────────────────────────────────
    //  Copy CURRENT visible question text (F10) – improved
    // ────────────────────────────────────────────────
    function isVisibleAndInView(el) {
        if (!el) return false;
        const style = window.getComputedStyle(el);
        if (style.display === 'none' || style.visibility === 'hidden' || parseFloat(style.opacity) < 0.1) return false;

        let current = el;
        let depth = 0;
        while (current && depth < 15) {
            const s = window.getComputedStyle(current);
            if (s.display === 'none' || s.visibility === 'hidden' || parseFloat(s.opacity) < 0.1) return false;
            current = current.parentElement;
            depth++;
        }

        const rect = el.getBoundingClientRect();
        if (rect.width < 50 || rect.height < 20) return false; // too tiny for question text

        // Roughly in viewport
        return rect.top > -50 && rect.bottom < (window.innerHeight + 50) &&
               rect.left > -50 && rect.right < (window.innerWidth + 50);
    }

    function findCurrentQuestionSpan() {
        console.log('[TextCopy] Searching for CURRENT visible question (strict mode)...');

        const containerSelectors = [
            '[class*="body-inner"]',
            '.mcq__body-inner',
            '.component__body-inner',
            '[class*="mcq__body"]',
            '[class*="component__body"]'
        ];

        const spanSelectors = ['p span', 'p > span', 'span'];

        let candidates = [];

        // Light DOM
        containerSelectors.forEach(sel => {
            document.querySelectorAll(sel).forEach(container => {
                if (!isVisibleAndInView(container)) return;
                spanSelectors.forEach(sSel => {
                    container.querySelectorAll(sSel).forEach(span => {
                        const txt = span.textContent?.trim();
                        if (!txt || txt.length < 20) return;
                        if (!isVisibleAndInView(span)) return;

                        const rect = span.getBoundingClientRect();
                        const area = rect.width * rect.height;
                        const z = parseFloat(window.getComputedStyle(span).zIndex) || 0;
                        const hasQuestionMark = txt.includes('?');

                        candidates.push({
                            span,
                            txt,
                            area,
                            zIndex: isNaN(z) ? 0 : z,
                            hasQuestionMark,
                            depth: span.compareDocumentPosition(document.body) // rough DOM order
                        });
                    });
                });
            });
        });

        // Shadow DOM
        function walkShadows(root) {
            const walker = document.createTreeWalker(root, NodeFilter.SHOW_ELEMENT);
            let node;
            while ((node = walker.nextNode())) {
                if (node.shadowRoot) {
                    containerSelectors.forEach(sel => {
                        node.shadowRoot.querySelectorAll(sel).forEach(container => {
                            if (!isVisibleAndInView(container)) return;
                            spanSelectors.forEach(sSel => {
                                container.querySelectorAll(sSel).forEach(span => {
                                    const txt = span.textContent?.trim();
                                    if (!txt || txt.length < 20) return;
                                    if (!isVisibleAndInView(span)) return;

                                    const rect = span.getBoundingClientRect();
                                    const area = rect.width * rect.height;
                                    const z = parseFloat(window.getComputedStyle(span).zIndex) || 0;
                                    const hasQuestionMark = txt.includes('?');

                                    candidates.push({
                                        span,
                                        txt,
                                        area,
                                        zIndex: isNaN(z) ? 0 : z,
                                        hasQuestionMark,
                                        depth: span.compareDocumentPosition(document.body)
                                    });
                                });
                            });
                        });
                    });
                    walkShadows(node.shadowRoot);
                }
            }
        }
        walkShadows(document.body);

        if (candidates.length === 0) {
            console.log('[TextCopy] No visible candidates found');
            return null;
        }

        // Sort: prefer question mark → higher z-index → larger area → earlier in DOM
        candidates.sort((a, b) => {
            if (a.hasQuestionMark !== b.hasQuestionMark) return b.hasQuestionMark - a.hasQuestionMark;
            if (a.zIndex !== b.zIndex) return b.zIndex - a.zIndex;
            if (a.area !== b.area) return b.area - a.area;
            return a.depth - b.depth;
        });

        const best = candidates[0];
        console.log('[TextCopy] Selected:', best.txt.substring(0, 120) + (best.txt.length > 120 ? '...' : ''));
        console.log('[TextCopy] Stats → area:', best.area, '| z-index:', best.zIndex, '| has ?:', best.hasQuestionMark, '| candidates total:', candidates.length);

        return best.span;
    }

    async function copyCurrentQuestion() {
        const el = findCurrentQuestionSpan();
        if (!el) return;

        const text = el.textContent?.trim() || '';
        if (!text) return;

        console.log('[TextCopy] Copying:', text.substring(0, 120) + (text.length > 120 ? '...' : ''));

        try {
            await navigator.clipboard.writeText(text);
            console.log('[TextCopy] SUCCESS – current question copied');
        } catch (err) {
            console.error('[TextCopy] Clipboard failed:', err);
            const ta = document.createElement('textarea');
            ta.value = text;
            ta.style.position = 'fixed'; ta.style.opacity = '0';
            document.body.appendChild(ta);
            ta.select();
            document.execCommand('copy');
            document.body.removeChild(ta);
            console.log('[TextCopy] Fallback copy done');
        }
    }

    // ────────────────────────────────────────────────
    //  Hotkeys
    // ────────────────────────────────────────────────
    VM.shortcut.register('f12', () => {
        setTimeout(() => { if (!triggerSubmitClick()) setTimeout(triggerSubmitClick, 400); }, 60);
    });

    VM.shortcut.register('f10', copyCurrentQuestion);

    console.log('[VM-Tools] Loaded v2.0 → F12 = Submit | F10 = Copy CURRENT visible question (strict visibility)');
})();