(() => {
    'use strict';

    let lastTweetText = '';
    let lastSelectedText = '';
    let sidebarHost = null;
    let isTyping = false;

    // ===== DATA =====
    const LANGS = [
        { value: 'en', label: 'English' ,selected: true },
        { value: 'vi', label: 'Việt' },
        { value: 'ja', label: 'Nhật' },
        { value: 'ko', label: 'Han' },
        { value: 'cn', label: 'TQ' }
    ];

    const ModelAI = [
        { value: 'openai', label: 'Chat GPT' },
        { value: 'google', label: 'Gemini' },
        { value: 'deepseek', label: 'Deep Seek' },
    ]

    const TONE_BASE = [
        { value: 'CASUAL',        text: 'Giản dị, thân thiện' , selected: true },
        { value: 'PROFESSIONAL',  text: 'chuyên nghiệp, rõ ràng, đáng tin cậy' },
        { value: 'HYPE',          text: 'Hype — Hào hứng, tràn đầy năng lượng' },
        { value: 'URGENT',        text: 'urgent' },
        { value: 'HUMOROUS',      text: 'Dí dỏm, hài hước' },
        { value: 'INFORMATIVE',   text: 'Thông tin, chính xác' },
        { value: 'EMPATHETIC',    text: 'empathetic — Đồng cảm, thấu hiểu cảm xúc' },
        { value: 'PROVOCATIVE',   text: 'provocative — Gợi mở suy nghĩ, thách thức giả định' },
        { value: 'AUTHORITATIVE', text: 'authoritative — Tự tin, uy quyền' },
        { value: 'SPICY',         text: 'spicy — Tự tin, hơi đối đầu, chỉ thẳng' }
    ];

    const TONE_JA_ONLY = [
        { value: 'AGGRESSIVE',    text: 'aggressive — Cục súc, attack ideas mạnh' },
        { value: 'PROFANE',       text: 'profane — Nói tục thoải mái, raw' },
        { value: 'INFLAMMATORY',  text: 'inflammatory — Kích động cao' },
        { value: 'SAVAGE',        text: 'savage — Chửi tục OK, sass tối đa' }
    ];

    const ANGLE_DEFAULT = [
        { value: 'NATURAL',        text: 'Phản ứng tự nhiên' },
        { value: 'AGREE',          text: 'Đồng ý' },
        { value: 'CHALLENGE',      text: 'Không đồng ý' },
        { value: 'ADD_INFO',       text: 'Thêm thông tin liên quan hữu ích' },
        { value: 'FUNNY',          text: 'Hóm hỉnh, hài hước nhẹ nhàng' },
        { value: 'QUESTION',       text: 'Đặt câu hỏi tiếp theo thông minh' },
        { value: 'RELATE',         text: 'Chia sẻ trải nghiệm cá nhân tương tự' },
        { value: 'DEVIL_ADVOCATE', text: 'Phản biện công bằng, không thù địch' },
        { value: 'EXPAND',         text: 'Phân tích sâu 1 điểm' },
        { value: 'VALIDATE',       text: 'Khẳng định bằng chứng mạnh mẽ' },
        { value: 'CTA',            text: 'Kêu gọi hành động nhẹ nhàng' }
    ];

    const ANGLE_EMPATHY = [
        { value: 'WISH_RECOVERY',    text: 'Chúc hồi phục' },
        { value: 'TRIBUTE',          text: 'Tưởng nhớ / RIP' },
        { value: 'SOLIDARITY',       text: 'Đồng lòng / Đứng cùng' },
        { value: 'PERSONAL_SUPPORT', text: 'Hỗ trợ cá nhân' },
        { value: 'SHARED_GRIEF',     text: 'Cùng nỗi buồn' }
    ];

    function getTones(lang) {
        if (lang === 'ja') return [...TONE_BASE, ...TONE_JA_ONLY];
        return [...TONE_BASE];
    }
    function getAngles(tone) {
        return tone === 'EMPATHETIC' ? [...ANGLE_DEFAULT, ...ANGLE_EMPATHY] : [...ANGLE_DEFAULT];
    }

    // ===== A. CAPTURE TWEET & SELECTED TEXT =====
    document.addEventListener('contextmenu', (e) => {
        const sel = window.getSelection().toString().trim();
        if (sel) lastSelectedText = sel;

        const article = e.target.closest('article');
        if (article) {
            const textEl =
                article.querySelector('[data-testid="tweetText"]') ||
                article.querySelector('div[lang]') ||
                article.querySelector('div[dir="auto"]');
            lastTweetText = textEl ? textEl.innerText.trim() : article.innerText.trim().slice(0, 600);
        }
    });

    // ===== B. LISTENER =====
    chrome.runtime.onMessage.addListener((req, sender, sendResponse) => {
        if (req.action === 'OPEN_FORM') {
            if (!lastTweetText) {
                sendResponse({ ok: false, reason: 'no_text' });
                return false;
            }
            openSidebar(lastTweetText);
            sendResponse({ ok: true });
            return false;
        }
        if (req.action === 'OPEN_TRANSLATE_FORM') {
            openSidebar('');
            switchTab('translate');
            const s = sidebarHost?.shadowRoot;
            if (s) {
                const input = s.querySelector('#trans-input');
                if (input) input.value = req.text || '';
            }
            sendResponse({ ok: true });
            return false;
        }
        if (req.action === 'SHOW_RESULT') {
            showResult(req.comment, req.model, req.commentTransVi, req.commentTransModel);
            sendResponse({ ok: true });
            return false;
        }
        if (req.action === 'SHOW_ERROR') {
            showError(req.error);
            sendResponse({ ok: true });
            return false;
        }
        if (req.action === 'SHOW_TRANSLATE_RESULT') {
            showTranslateResult(req.content, req.model);
            sendResponse({ ok: true });
            return false;
        }
        if (req.action === 'SHOW_TRANSLATE_ERROR') {
            showTranslateError(req.error);
            sendResponse({ ok: true });
            return false;
        }
        sendResponse({ ok: false, unknown: true });
        return false;
    });

    // ===== C. TYPING ENGINE =====
    async function simulateHumanTyping(fullText) {
        let editor =
            document.querySelector('[data-testid="tweetTextarea_0"]') ||
            document.querySelector('div[contenteditable="true"][role="textbox"]');

        if (!editor) {
            alert('🔍 Không tìm thấy ô reply.\n\n👉 Hãy bấm nút "Reply" của tweet trước để ô nhập hiện ra, rồi thử lại!');
            return false;
        }

        editor.focus();
        editor.click();

        editor.textContent = '';
        const textNode = document.createTextNode('');
        editor.appendChild(textNode);

        const sel = window.getSelection();
        const range = document.createRange();
        range.setStart(textNode, 0);
        range.collapse(true);
        sel.removeAllRanges();
        sel.addRange(range);

        for (let i = 0; i < fullText.length; i++) {
            const char = fullText[i];
            textNode.nodeValue += char;

            range.setEnd(textNode, textNode.nodeValue.length);
            range.collapse(false);
            sel.removeAllRanges();
            sel.addRange(range);

            editor.dispatchEvent(new InputEvent('input', {
                bubbles: true,
                cancelable: true,
                inputType: 'insertText',
                data: char
            }));

            let delay = 30 + Math.random() * 50;
            if (char === ' ') delay += 40 + Math.random() * 40;
            if ('.!?,'.includes(char)) delay += 120 + Math.random() * 200;

            await new Promise(r => setTimeout(r, delay));
        }

        editor.dispatchEvent(new Event('change', { bubbles: true }));
        return true;
    }

    // ===== D. SIDEBAR UI =====
    function switchTab(name) {
        if (!sidebarHost) return;
        const s = sidebarHost.shadowRoot;
        s.querySelectorAll('.tab-btn').forEach(b => b.classList.toggle('active', b.dataset.tab === name));
        s.querySelectorAll('.tab-content').forEach(c => c.classList.toggle('active', c.id === `tab-${name}`));
    }

    function openSidebar(tweetText) {
        // ⭐ FIX: Nếu mở comment mới (có tweetText), xóa sidebar cũ để render lại từ đầu
        if (tweetText && sidebarHost) {
            removeSidebar();
        }

        // Nếu sidebar vẫn còn (trường hợp translate hoặc đang mở), chỉ cần mở drawer
        if (sidebarHost) {
            const drawer = sidebarHost.shadowRoot.querySelector('.drawer');
            if (drawer) drawer.classList.add('open');
            return;
        }

        const host = document.createElement('div');
        host.id = 'x-ai-sidebar-host';
        Object.assign(host.style, {
            position: 'fixed', top: '0', left: '0', width: '0', height: '0',
            zIndex: '2147483647', overflow: 'visible', pointerEvents: 'none'
        });
        document.body.appendChild(host);
        sidebarHost = host;

        const shadow = host.attachShadow({ mode: 'open' });
        const style = document.createElement('style');
        style.textContent = `
      .fab { position: fixed; right: 24px; bottom: 24px; width: 56px; height: 56px; border-radius: 50%;
             background: #1d9bf0; color: #fff; font-size: 24px; display: flex; align-items: center; justify-content: center;
             cursor: pointer; box-shadow: 0 4px 16px rgba(0,0,0,0.25); border: none; pointer-events: auto; z-index: 1;
             transition: transform .15s ease; user-select: none; }
      .fab:hover { transform: scale(1.08); }
      .drawer { position: fixed; right: 0; top: 0; width: 420px; max-width: 100vw; height: 100vh; background: #fff; color: #0f1419;
                box-shadow: -5px 0 25px rgba(0,0,0,0.15); transform: translateX(100%); transition: transform .25s ease;
                display: flex; flex-direction: column; pointer-events: auto; z-index: 2;
                font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
      .drawer.open { transform: translateX(0); }
      .header { padding: 14px 18px; border-bottom: 1px solid #eff3f4; display: flex; justify-content: space-between; align-items: center;
                font-weight: 700; font-size: 16px; }
      .btn-x { background: none; border: none; font-size: 20px; cursor: pointer; color: #536471; padding: 4px; line-height: 1; }
      .tabs { display: flex; border-bottom: 1px solid #eff3f4; }
      .tab-btn { flex: 1; padding: 10px; border: none; background: none; cursor: pointer; font-size: 14px; color: #536471;
                 border-bottom: 2px solid transparent; font-weight: 600; }
      .tab-btn.active { color: #1d9bf0; border-bottom-color: #1d9bf0; }
      .tab-content { padding: 16px 18px; flex: 1; overflow-y: auto; display: none; flex-direction: column; gap: 10px; }
      .tab-content.active { display: flex; }
      .tweet-box { background: #f7f9f9; border: 1px solid #cfd9de; border-radius: 10px; padding: 10px; font-size: 16px;
                   line-height: 1.4; max-height: 150px; overflow-y: auto; color: #333; white-space: pre-wrap; word-break: break-word; }
      label { font-size: 12px; font-weight: 700; color: #536471; text-transform: uppercase; letter-spacing: .3px; margin-top: 4px; }
      select, input[type="text"], input[type="password"], textarea { width: 100%; padding: 9px 10px; border-radius: 8px; border: 1px solid #cfd9de;
                                                            font-size: 14px; background: #fff; box-sizing: border-box; font-family: inherit; }
      textarea { resize: vertical; min-height: 80px; }
      .hint-text { font-size: 12px; color: #888; line-height: 1.4; font-style: italic; }
      button.primary { width: 100%; padding: 10px; border-radius: 9999px; border: none; background: #1d9bf0; color: #fff;
                       font-weight: 700; font-size: 15px; cursor: pointer; margin-top: 6px; }
      button.primary:hover { background: #1a8cd8; }
      button.primary:disabled { background: #8ecdf7; cursor: default; }
      button.green { background: #17bf63 !important; }
      button.green:hover { background: #15a857 !important; }
      button.gray { background: #536471 !important; }
      button.gray:hover { background: #3e4e56 !important; }
      .status { display: none; padding: 12px; border-radius: 10px; font-size: 14px; line-height: 1.5;
                white-space: pre-wrap; word-break: break-word; }
      .status.ok { background: #e8f6fe; border: 1px solid #b4dffc; }
      .status.err { background: #ffeaea; border: 1px solid #ffc5c5; color: #b00; }
      .status.trans { background: #f0fdf4; border: 1px solid #86efac; color: #14532d; }
      .copy-hint { font-size: 12px; color: #536471; text-align: center; display: none; }
      .badge { display: inline-block; padding: 2px 8px; border-radius: 999px; background: #ffad1f; color: #fff; font-size: 11px; font-weight: 700; }
      .typing-opts { margin-top: 8px; padding-top: 10px; border-top: 1px solid #eff3f4; display: none; flex-direction: column; gap: 8px; }
      .typing-opts.visible { display: flex; }
      .check-row { display: flex; align-items: center; gap: 8px; font-size: 13px; color: #0f1419; cursor: pointer; }
      .check-row input { cursor: pointer; }
      .btn-row { display: flex; gap: 8px; }
      .btn-row .primary { flex: 1; margin-top: 0; }
    `;

        const fab = document.createElement('button');
        fab.className = 'fab'; fab.textContent = '🤖'; fab.title = 'AI Comment';

        const drawer = document.createElement('div');
        drawer.className = 'drawer';
        drawer.innerHTML = `
      <div class="header"><span>✍️ AI Comment</span><button class="btn-x">✕</button></div>
      <div class="tabs">
        <button class="tab-btn active" data-tab="comment">Comment</button>
        <button class="tab-btn" data-tab="translate">🌐 Dịch</button>
        <button class="tab-btn" data-tab="config">⚙️ Config <span class="badge" id="cfg-missing" style="display:none">!</span></button>
      </div>

      <div class="tab-content active" id="tab-comment">
        <div class="tweet-box">${escapeHtml(tweetText)}</div>

        <label>Ngôn ngữ đầu ra</label>
        <select id="ai-lang">${LANGS.map(l => `<option value="${l.value}">${l.label}</option>`).join('')}</select>

        <label>Tone</label>
        <select id="ai-tone"></select>
        <div class="hint-text" id="ai-tone-hint"></div>

        <label>Angle</label>
        <select id="ai-angle"></select>
        <div class="hint-text" id="ai-angle-hint"></div>

        <button class="primary" id="ai-run">🚀 Tạo Comment</button>

        <div class="status" id="ai-status"></div>
        <div class="status trans" id="ai-trans-vi" style="display:none;"></div>
        <div class="copy-hint" id="ai-hint"></div>

        <div class="typing-opts" id="ai-typing-opts">
          <label class="check-row">
            <input type="checkbox" id="ai-typing" checked>
            <span>Giả lập gõ như người thật (từ từ)</span>
          </label>
          <div class="btn-row">
            <button class="primary gray" id="ai-copy">📋 Copy</button>
            <button class="primary green" id="ai-paste">📥 Dán vào ô reply</button>
          </div>
          <div style="font-size:12px;color:#536471;text-align:center;">
            💡 Nếu chưa mở ô reply, hãy bấm Reply trước!
          </div>
        </div>
      </div>

      <div class="tab-content" id="tab-translate">
        <div style="font-size:13px;color:#536471;margin-bottom:6px;">
          Nhập văn bản và chọn ngôn ngữ cần dịch. API translate lấy từ tab Config.
        </div>
        <label>Văn bản cần dịch</label>
        <textarea id="trans-input" style="font-size:18px" placeholder="Nhập hoặc bôi đen rồi chuột phải..."></textarea>

        <div style="display: flex">
            <div>
                <label>Ngôn ngữ đích</label>
                <select id="trans-target">${LANGS.map(l => `<option value="${l.value}" ${l.value === 'ja' ? 'selected' : ''}>${l.label}</option>`).join('')}</select>
            </div>
            <div>
            <label>Model</label>
            <select id="trans-model">${ModelAI.map(l => `<option value="${l.value}" ${l.value === 'openai' ? 'selected' : ''}>${l.label}</option>`).join('')}</select>
        
            </div>
        </div>

        <button class="primary" id="trans-run">🌐 Dịch</button>
        <div class="status" id="trans-status"></div>
        <div class="copy-hint" id="trans-hint"></div>

        <div class="btn-row">
          <button class="primary gray" id="trans-copy">📋 Copy</button>
          <button class="primary green" id="trans-paste">📥 Dán vào ô reply</button>
        </div>
      </div>

      <div class="tab-content" id="tab-config">
        <div style="font-size:13px; color:#536471; margin-bottom:6px;">
          Cấu hình API. Nếu Translate URL để trống, sẽ dùng chung Comment URL.
        </div>
        <label>Comment API URL</label>
        <input type="text" id="cfg-url" placeholder="https://api.yoursite.com/v1/generate">
        <label>Comment API Key</label>
        <input type="password" id="cfg-key" placeholder="sk-...">
        <label>Translate API URL (tùy chọn)</label>
        <input type="text" id="cfg-trans-url" placeholder="https://api.yoursite.com/v1/translate">
        <label>Translate API Key (tùy chọn)</label>
        <input type="password" id="cfg-trans-key" placeholder="sk-...">
        <div style="display:flex; gap:8px;">
          <button class="primary" id="cfg-save" style="flex:1">💾 Lưu</button>
          <button class="primary green" id="cfg-test" style="flex:1">🧪 Test đọc</button>
        </div>
        <div class="status" id="cfg-status"></div>
      </div>
    `;

        shadow.appendChild(style);
        shadow.appendChild(fab);
        shadow.appendChild(drawer);

        // Toggle
        const toggleDrawer = () => drawer.classList.toggle('open');
        fab.addEventListener('click', toggleDrawer);
        drawer.querySelector('.btn-x').addEventListener('click', () => drawer.classList.remove('open'));
        requestAnimationFrame(() => drawer.classList.add('open'));

        // Tabs
        const tabBtns = drawer.querySelectorAll('.tab-btn');
        const tabContents = drawer.querySelectorAll('.tab-content');
        tabBtns.forEach(btn => {
            btn.addEventListener('click', () => {
                tabBtns.forEach(b => b.classList.remove('active'));
                tabContents.forEach(c => c.classList.remove('active'));
                btn.classList.add('active');
                drawer.querySelector(`#tab-${btn.dataset.tab}`).classList.add('active');
            });
        });

        // ===== COMMENT TAB =====
        const langSel  = drawer.querySelector('#ai-lang');
        const toneSel  = drawer.querySelector('#ai-tone');
        const toneHint = drawer.querySelector('#ai-tone-hint');
        const angleSel = drawer.querySelector('#ai-angle');
        const angleHint= drawer.querySelector('#ai-angle-hint');
        const runBtn   = drawer.querySelector('#ai-run');
        const statusEl = drawer.querySelector('#ai-status');
        const transViEl= drawer.querySelector('#ai-trans-vi');
        const copyHint = drawer.querySelector('#ai-hint');
        const typingOpts = drawer.querySelector('#ai-typing-opts');
        const typingChk  = drawer.querySelector('#ai-typing');
        const pasteBtn   = drawer.querySelector('#ai-paste');
        const copyBtn    = drawer.querySelector('#ai-copy');

        function populateSelect(sel, items, selectedValue) {
            sel.innerHTML = items.map(it => `<option value="${it.value}">${it.text}</option>`).join('');
            if (selectedValue && items.find(i => i.value === selectedValue)) sel.value = selectedValue;
        }
        function updateTone(lang, keepValueIfValid) {
            const items = getTones(lang);
            const old = toneSel.value;
            populateSelect(toneSel, items, keepValueIfValid && items.find(i => i.value === old) ? old : null);
            onToneChange();
        }
        function onToneChange() {
            const lang = langSel.value;
            const tone = toneSel.value;
            const tItem = getTones(lang).find(i => i.value === tone);
            toneHint.textContent = tItem ? tItem.text : '';
            const oldAngle = angleSel.value;
            const aItems = getAngles(tone);
            populateSelect(angleSel, aItems, aItems.find(i => i.value === oldAngle) ? oldAngle : null);
            onAngleChange();
        }
        function onAngleChange() {
            const tone = toneSel.value;
            const angle = angleSel.value;
            const aItem = getAngles(tone).find(i => i.value === angle);
            angleHint.textContent = aItem ? aItem.text : '';
        }

        langSel.addEventListener('change', () => updateTone(langSel.value, true));
        toneSel.addEventListener('change', onToneChange);
        angleSel.addEventListener('change', onAngleChange);
        updateTone(langSel.value, false);

        runBtn.addEventListener('click', () => {
            const lang  = langSel.value;
            const tone  = toneSel.value;
            const angle = angleSel.value;
            runBtn.disabled = true;
            statusEl.style.display = 'block'; statusEl.className = 'status ok';
            statusEl.textContent = '⏳ Đang gọi API...';
            transViEl.style.display = 'none'; transViEl.textContent = '';
            copyHint.style.display = 'none';
            typingOpts.classList.remove('visible');

            chrome.runtime.sendMessage(
                { action: 'GENERATE_COMMENT', data: { text: tweetText, lang, tone, angle } },
                () => {
                    if (chrome.runtime.lastError) {
                        statusEl.className = 'status err';
                        statusEl.textContent = 'Lỗi kết nối: ' + chrome.runtime.lastError.message;
                        runBtn.disabled = false;
                    }
                }
            );
        });

        copyBtn.addEventListener('click', async () => {
            const text = statusEl.textContent;
            if (!text || text.startsWith('⏳') || text.startsWith('Lỗi') || text.startsWith('⚠️')) {
                flashBtn(copyBtn, '⚠️ Chưa có nội dung!');
                return;
            }
            try {
                await navigator.clipboard.writeText(text);
                flashBtn(copyBtn, '✅ Đã copy!');
            } catch (e) { flashBtn(copyBtn, '❌ Lỗi copy'); }
        });

        pasteBtn.addEventListener('click', async () => {
            const text = statusEl.textContent;
            if (!text || text.startsWith('⏳') || text.startsWith('Lỗi') || text.startsWith('⚠️')) {
                alert('Chưa có nội dung hợp lệ để dán. Hãy tạo comment trước!');
                return;
            }
            if (isTyping) return;
            isTyping = true; pasteBtn.disabled = true;
            try {
                if (typingChk.checked) {
                    pasteBtn.textContent = '⌨️ Đang gõ...';
                    const ok = await simulateHumanTyping(text);
                    if (ok) drawer.classList.remove('open');
                } else {
                    await navigator.clipboard.writeText(text);
                    alert('✅ Đã copy vào clipboard!\n\nBạn tự dán vào ô reply nhé.');
                }
            } catch (err) {
                console.error('Typing error:', err);
                alert('Lỗi khi nhập: ' + err.message);
            } finally {
                isTyping = false; pasteBtn.disabled = false;
                pasteBtn.textContent = '📥 Dán vào ô reply';
            }
        });

        // ===== TRANSLATE TAB =====
        const transInput = drawer.querySelector('#trans-input');
        const transTarget= drawer.querySelector('#trans-target');
        const transModel= drawer.querySelector('#trans-model');
        const transRun   = drawer.querySelector('#trans-run');
        const transStatus= drawer.querySelector('#trans-status');
        const transHint  = drawer.querySelector('#trans-hint');
        const transCopy  = drawer.querySelector('#trans-copy');
        const transPaste = drawer.querySelector('#trans-paste');

        transRun.addEventListener('click', () => {
            const text = transInput.value.trim();
            const target = transTarget.value;
            const targetModel = transModel.value;
            if (!text) { flashBtn(transRun, '⚠️ Nhập văn bản!'); return; }
            transRun.disabled = true;
            transStatus.style.display = 'block'; transStatus.className = 'status ok';
            transStatus.textContent = '⏳ Đang dịch...';
            transHint.style.display = 'none';

            chrome.runtime.sendMessage(
                { action: 'TRANSLATE_TEXT', data: { text, target_lang: target, target_model: targetModel } },
                () => {
                    if (chrome.runtime.lastError) {
                        transStatus.className = 'status err';
                        transStatus.textContent = 'Lỗi kết nối: ' + chrome.runtime.lastError.message;
                        transRun.disabled = false;
                    }
                }
            );
        });

        transCopy.addEventListener('click', async () => {
            const text = transStatus.textContent;
            if (!text || text.startsWith('⏳')) { flashBtn(transCopy, '⚠️ Chưa có!'); return; }
            try { await navigator.clipboard.writeText(text); flashBtn(transCopy, '✅ Đã copy!'); }
            catch (e) { flashBtn(transCopy, '❌ Lỗi'); }
        });

        transPaste.addEventListener('click', async () => {
            const text = transStatus.textContent;
            if (!text || text.startsWith('⏳')) { alert('Chưa có kết quả dịch!'); return; }
            if (isTyping) return;
            isTyping = true; transPaste.disabled = true;
            try {
                transPaste.textContent = '⌨️ Đang gõ...';
                const ok = await simulateHumanTyping(text);
                if (ok) drawer.classList.remove('open');
            } catch (err) {
                alert('Lỗi khi nhập: ' + err.message);
            } finally {
                isTyping = false; transPaste.disabled = false;
                transPaste.textContent = '📥 Dán vào ô reply';
            }
        });

        // ===== CONFIG TAB =====
        const urlIn     = drawer.querySelector('#cfg-url');
        const keyIn     = drawer.querySelector('#cfg-key');
        const transUrlIn= drawer.querySelector('#cfg-trans-url');
        const transKeyIn= drawer.querySelector('#cfg-trans-key');
        const saveBtn   = drawer.querySelector('#cfg-save');
        const testBtn   = drawer.querySelector('#cfg-test');
        const cfgStatus = drawer.querySelector('#cfg-status');
        const cfgBadge  = drawer.querySelector('#cfg-missing');

        function showCfgStatus(msg, isErr) {
            cfgStatus.style.display = 'block';
            cfgStatus.className = 'status ' + (isErr ? 'err' : 'ok');
            cfgStatus.textContent = msg;
        }

        chrome.storage.local.get(['apiUrl','apiKey','translateUrl','translateKey'], (cfg) => {
            if (cfg.apiUrl) urlIn.value = cfg.apiUrl;
            if (cfg.apiKey) keyIn.value = cfg.apiKey;
            if (cfg.translateUrl) transUrlIn.value = cfg.translateUrl;
            if (cfg.translateKey) transKeyIn.value = cfg.translateKey;
            cfgBadge.style.display = (!cfg.apiUrl || !cfg.apiKey) ? 'inline-block' : 'none';
        });

        saveBtn.addEventListener('click', () => {
            const url = urlIn.value.trim(), key = keyIn.value.trim();
            if (!url || !key) { showCfgStatus('❌ Comment URL và Key không được để trống!', true); return; }
            try { new URL(url); } catch { showCfgStatus('❌ URL không hợp lệ', true); return; }
            const tUrl = transUrlIn.value.trim();
            const tKey = transKeyIn.value.trim();
            chrome.storage.local.set({
                apiUrl: url, apiKey: key,
                translateUrl: tUrl, translateKey: tKey
            }, () => {
                showCfgStatus('✅ Đã lưu!', false);
                cfgBadge.style.display = 'none';
            });
        });

        testBtn.addEventListener('click', () => {
            chrome.storage.local.get(['apiUrl','apiKey','translateUrl','translateKey'], (cfg) => {
                const tUrl = cfg.translateUrl || cfg.apiUrl || '(trống)';
                showCfgStatus(
                    `Comment: ${cfg.apiUrl || '(trống)'}\n` +
                    `Translate: ${tUrl}\n` +
                    `Key: ${cfg.apiKey ? cfg.apiKey.slice(0,8)+'...' : '(trống)'}`,
                    !cfg.apiUrl || !cfg.apiKey
                );
            });
        });
    }

    // ===== SHOW RESULT / ERROR =====
    function showResult(comment, model='', transVi='', transByModal = '') {
        if (!sidebarHost) return;
        const s = sidebarHost.shadowRoot;
        const statusEl = s.querySelector('#ai-status');
        const transViEl= s.querySelector('#ai-trans-vi');
        const copyHint = s.querySelector('#ai-hint');
        const runBtn   = s.querySelector('#ai-run');
        const drawer   = s.querySelector('.drawer');
        const typingOpts = s.querySelector('#ai-typing-opts');

        console.log({model});
        if (statusEl) {
            statusEl.style.display = 'block';
            statusEl.className = 'status ok';
            statusEl.textContent = comment;
        }
        if (transViEl) {
            if (transVi) {
                transViEl.style.display = 'block';
                transViEl.textContent = '🇻🇳 ' + transVi;
            } else {
                transViEl.style.display = 'none';
                transViEl.textContent = '';
            }
        }
        if (copyHint) { copyHint.style.display = 'block'; copyHint.textContent = `W:${model} - T:${transByModal}` || '📋 Copy kết quả và dán vào ô reply!'; }
        if (runBtn)   runBtn.disabled = false;
        if (drawer)   drawer.classList.add('open');
        if (typingOpts) typingOpts.classList.add('visible');
    }

    function showError(msg) {
        if (!sidebarHost) return;
        const s = sidebarHost.shadowRoot;
        const statusEl = s.querySelector('#ai-status');
        const transViEl= s.querySelector('#ai-trans-vi');
        const runBtn   = s.querySelector('#ai-run');
        const drawer   = s.querySelector('.drawer');
        if (statusEl) { statusEl.style.display = 'block'; statusEl.className = 'status err'; statusEl.textContent = msg; }
        if (transViEl) { transViEl.style.display = 'none'; transViEl.textContent = ''; }
        if (runBtn)   runBtn.disabled = false;
        if (drawer)   drawer.classList.add('open');
    }

    function showTranslateResult(content, model = '') {
        if (!sidebarHost) return;
        const s = sidebarHost.shadowRoot;
        const status = s.querySelector('#trans-status');
        const hint   = s.querySelector('#trans-hint');
        const runBtn = s.querySelector('#trans-run');
        const drawer = s.querySelector('.drawer');
        if (status) { status.style.display = 'block'; status.className = 'status ok'; status.textContent = content; }
        if (hint) {
            hint.style.display = 'block';hint.textContent = model
        }
        if (runBtn) runBtn.disabled = false;
        if (drawer) drawer.classList.add('open');
    }

    function showTranslateError(msg) {
        if (!sidebarHost) return;
        const s = sidebarHost.shadowRoot;
        const status = s.querySelector('#trans-status');
        const runBtn = s.querySelector('#trans-run');
        if (status) { status.style.display = 'block'; status.className = 'status err'; status.textContent = msg; }
        if (runBtn) runBtn.disabled = false;
    }

    function removeSidebar() {
        if (sidebarHost) { sidebarHost.remove(); sidebarHost = null; }
    }

    function escapeHtml(text) {
        const d = document.createElement('div'); d.textContent = text; return d.innerHTML;
    }

    function flashBtn(btn, msg) {
        const old = btn.textContent;
        btn.textContent = msg;
        setTimeout(() => btn.textContent = old, 1200);
    }
})();