// ==UserScript==
// @name         Duck.ai Answer Copier V3 (keep line breaks v2)
// @version      2.5
// @description  Copies new AI answers to clipboard from Duck.ai (excludes reasoning) and preserves line breaks/paragraphs
// @author       GNUser
// @match        https://duck.ai/*
// @grant        GM_setClipboard
// @run-at       document-end
// ==/UserScript==

(function() {
    'use strict';

    let lastAnswerText = '';
    let lastContainerId = null;
    let debounceTimer = null;

    const observer = new MutationObserver(() => {
        clearTimeout(debounceTimer);
        debounceTimer = setTimeout(checkForNewAnswer, 300);
    });

    function checkForNewAnswer() {
        const containers = document.querySelectorAll('[data-activeresponse="true"]');
        if (containers.length === 0) return;

        const latestContainer = containers[containers.length - 1];
        const containerId = latestContainer.dataset.id || latestContainer.textContent.length;

        if (lastContainerId !== containerId) {
            lastContainerId = containerId;
            console.log('New response detected, ready to copy');
        }

        const answerText = extractAnswerText(latestContainer);

        if (answerText && answerText.length > 20 && answerText !== lastAnswerText) {
            lastAnswerText = answerText;
            GM_setClipboard(answerText);
            console.log('✓ Answer copied to clipboard (' + answerText.length + ' chars)');
            showNotification('Answer copied!');
        }
    }

    function extractAnswerText(container) {
        const clone = container.cloneNode(true);

        // Remove reasoning/thinking sections (unchanged selectors)
        clone.querySelectorAll('[class*="Rkf36nZWET9BmlbubWjr"]').forEach(el => el.remove());
        clone.querySelectorAll('[class*="swFO3435qp4ZavU5Pg5o"]').forEach(el => el.remove());

        clone.querySelectorAll('button').forEach(btn => {
            if (btn.textContent.includes('Reasoning') || btn.textContent.includes('Thinking')) {
                const parent = btn.closest('[class*="ROSvG0TIGDWviuEY4B3S"]');
                if (parent) parent.remove();
            }
        });

        const responseSection = clone.querySelector('[class*="ucB71mHYvyHsWKjYfYKI"]') || clone;
        const text = getTextPreserveBreaks(responseSection).trim();
        return normalizeLineBreaks(text);
    }

    // Walk DOM and insert \n between block elements and for <br>, preserving spacing.
    function getTextPreserveBreaks(node) {
        let out = '';

        const blockTags = new Set([
            'ADDRESS','ARTICLE','ASIDE','BLOCKQUOTE','DETAILS','DIALOG','DD','DIV','DL','DT','FIELDSET',
            'FIGCAPTION','FIGURE','FOOTER','FORM','H1','H2','H3','H4','H5','H6','HEADER','HR','LI','MAIN',
            'NAV','OL','P','PRE','SECTION','TABLE','TFOOT','UL','TR'
        ]);

        function walk(n) {
            if (n.nodeType === Node.TEXT_NODE) {
                out += n.nodeValue;
                return;
            }
            if (n.nodeType !== Node.ELEMENT_NODE) return;

            const tag = n.tagName;
            if (tag === 'BR') {
                out += '\n';
                return;
            }

            const isBlock = blockTags.has(tag) || getComputedStyle(n).display === 'block';

            if (isBlock && out && !out.endsWith('\n')) out += '\n';

            for (const child of n.childNodes) walk(child);

            if (isBlock && !out.endsWith('\n')) out += '\n';
        }

        walk(node);

        // Collapse multiple trailing/leading single newlines into double-newline paragraph separation
        // then trim excessive blanks
        out = out.replace(/\n{3,}/g, '\n\n');
        return out;
    }

    function normalizeLineBreaks(s) {
        // Normalize CRLF/CR -> LF, collapse spaces around newlines
        return s.replace(/\r\n/g, '\n').replace(/\r/g, '\n').replace(/[ \t]+\n/g, '\n').replace(/\n[ \t]+/g, '\n').replace(/\n{2,}/g, '\n\n');
    }

    function showNotification(message) {
        const notif = document.createElement('div');
        notif.textContent = message;
        notif.style.cssText = `
            position: fixed;
            bottom: 20px;
            right: 20px;
            background: #4CBA3C;
            color: white;
            padding: 12px 16px;
            border-radius: 8px;
            z-index: 10000;
            font-size: 14px;
            font-weight: 500;
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        `;
        document.body.appendChild(notif);
        setTimeout(() => notif.remove(), 2000);
    }

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