src/app.js

// @ts-check
/**
 * App wiring: the avatar stage + the speech-to-speech session + V.AIX catalog.
 * 
 * CHANGED: Replaced V.AISTUDIO iframe with native V.AIX panel for instant product search.
 * No more iframe — search is client-side from cached products (sub-100ms).
 */

import { S2sWsRealtimeClient } from "./s2s/s2s-ws-client.js";
import { AvatarStage, AVATAR_MOODS, AVATAR_GESTURES } from "./avatar.js";
import { smartNormalize } from "./viNumberFix.js";

const VOICES = [
  "Aiden", "Ryan", "Dylan", "Eric",
  "Ono_Anna", "Serena", "Sohee", "Uncle_Fu", "Vivian",
];
const DEFAULT_VOICE = "Sohee";

// ── Detect fakemic mode from URL (user opt-in only) ──────────────────────
const _urlParams = new URLSearchParams(location.search);
const FAKEMIC_MODE = _urlParams.has("fakemic");

// ── V.AIX Panel control ────────────────────────────────────────────────
const VAIX_PANEL_ID = "vaix-panel";
const VAIX_TOGGLE_ID = "vaix-toggle";

/** @type {HTMLDivElement | null} */
let vaixPanel = null;
/** @type {HTMLButtonElement | null} */
let vaixToggle = null;
/** @type {boolean} */
let vaixPanelOpen = false;

/**
 * Initialize V.AIX panel controls
 */
function initVaixPanel() {
  vaixPanel = /** @type {HTMLDivElement} */ (document.getElementById(VAIX_PANEL_ID));
  vaixToggle = /** @type {HTMLButtonElement} */ (document.getElementById(VAIX_TOGGLE_ID));

  if (!vaixPanel || !vaixToggle) {
    console.warn("[VAIX] Required elements not found");
    return;
  }

  // Toggle panel
  vaixToggle.addEventListener("click", () => {
    vaixPanelOpen = !vaixPanelOpen;
    vaixPanel.classList.toggle("open", vaixPanelOpen);
    vaixToggle.classList.toggle("active", vaixPanelOpen);
    vaixToggle.setAttribute("aria-label", vaixPanelOpen ? "Close V.AIX" : "Open V.AIX");
    vaixToggle.title = vaixPanelOpen ? "Close V.AIX" : "Open V.AIX";
  });

  // Close button
  const closeBtn = document.getElementById("vaix-close");
  if (closeBtn) {
    closeBtn.addEventListener("click", () => {
      vaixPanelOpen = false;
      vaixPanel.classList.remove("open");
      vaixToggle.classList.remove("active");
      vaixToggle.setAttribute("aria-label", "Open V.AIX");
      vaixToggle.title = "Open V.AIX";
    });
  }
}

/**
 * V.AIX control functions for avatar tools
 */
async function vaixFetchProducts() {
  // Always use server API to stay current (cache is 30min)
  try {
    const resp = await fetch("/api/vaix/products");
    if (resp.ok) {
      const data = await resp.json();
      return data.products || [];
    }
  } catch (e) {
    console.warn("[VAIX] Fetch failed:", e);
  }
  return [];
}

async function vaixSearch(query) {
  if (!query) return { results: [], total: 0 };
  try {
    const resp = await fetch(`/api/vaix/search?q=${encodeURIComponent(query)}`);
    if (resp.ok) {
      const data = await resp.json();
      return data;
    }
  } catch (e) {
    console.warn("[VAIX] Search failed:", e);
  }
  return { results: [], total: 0 };
}

async function vaixGetCategories() {
  try {
    const resp = await fetch("/api/vaix/categories");
    if (resp.ok) {
      const data = await resp.json();
      return data.categories || [];
    }
  } catch (e) {
    console.warn("[VAIX] Categories failed:", e);
  }
  return [];
}

// Expose globally for avatar tools
window.vaix = {
  open: () => { if (!vaixPanelOpen) vaixToggle.click(); },
  close: () => { if (vaixPanelOpen) vaixToggle.click(); },
  isOpen: () => vaixPanelOpen,
  search: vaixSearch,
  fetchProducts: vaixFetchProducts,
  getCategories: vaixGetCategories,
};

// ── Greeting ─────────────────────────────────────────────────────────────
async function getHotNewsGreeting() {
  let hotTitle = "";
  try {
    const resp = await fetch("/api/news/hot");
    if (resp.ok) {
      const data = await resp.json();
      if (data.titles && data.titles.length > 0) {
        for (const t of data.titles) {
          const clean = t.replace(/^[\d.]+[\s:]*/, "").trim();
          if (clean.length > 10 && clean.length < 200) { hotTitle = clean; break; }
        }
      }
    }
  } catch (e) { console.warn("News API failed:", e); }
  if (hotTitle) return `Hôm nay có tin: ${hotTitle}. Hỏi người dùng có muốn nghe không.`;
  return "";
}

const DEFAULT_INSTRUCTIONS = [
  "You are a friendly voice assistant with a visible, human-like 3D avatar.",
  "You also have access to V.AIX - a product catalog with Vietnamese goods. Use it to help users find products naturally.",
  "When showing products, mention key details: name, price, brand, and why it's a good match.",
  "CRITICAL: Always respond in the SAME LANGUAGE the user writes or speaks.",
  "If Vietnamese, respond in Vietnamese. If English, respond in English.",
  "When Vietnamese: write dates as 'ngày 9 tháng 7 năm 2026' (NOT '9/7/2026'),",
  "years as 'năm hai nghìn không trăm hai mươi sáu' (NOT '2026'),",
  "numbers as words (e.g. 'ba mươi lăm' NOT '35'),",
  "percentages as 'mười lăm phần trăm' NOT '15%',",
  "currency as 'năm mươi nghìn đồng' NOT '50.000đ'.",
  "Keep replies short, natural, warm. Never list-like.",
  "You can control avatar body with tools: set_mood, make_hand_gesture, make_facial_expression.",
  "You can control V.AIX catalog with tools: open_catalog, search_catalog, open_product, navigate_catalog.",
  "Use them naturally to express yourself and help users browse products.",
  "NEVER guess. Use search_web or search_wikipedia for ANY factual question.",
  "First call get_current_datetime to know today's date, then search.",
  "Never mention tools or that you control an avatar.",
].join(" ");

const STORAGE_KEYS = {
  voice: "avatar.voice", avatar: "avatar.model", instructions: "avatar.instructions",
  directUrl: "avatar.directUrl", subtitles: "avatar.subtitles",
};

const TOOL_DEFS = [
  { type: "function", name: "set_mood", description: "Change your avatar's overall mood/emotional state.", parameters: { type: "object", properties: { mood: { type: "string", enum: AVATAR_MOODS, description: "Mood name." } }, required: ["mood"] } },
  { type: "function", name: "make_hand_gesture", description: "Make a hand gesture with your avatar.", parameters: { type: "object", properties: { gesture: { type: "string", enum: AVATAR_GESTURES, description: "Gesture name." } }, required: ["gesture"] } },
  { type: "function", name: "make_facial_expression", description: "Make a quick facial expression, given as a single face emoji.", parameters: { type: "object", properties: { emoji: { type: "string", description: "A single face emoji." } }, required: ["emoji"] } },
  { type: "function", name: "get_current_datetime", description: "Get current date and time.", parameters: { type: "object", properties: {}, required: [] } },
  { type: "function", name: "search_wikipedia", description: "Search Wikipedia for a topic.", parameters: { type: "object", properties: { query: { type: "string", description: "Search query" } }, required: ["query"] } },
  { type: "function", name: "search_web", description: "Search the web for current info.", parameters: { type: "object", properties: { query: { type: "string", description: "Search query" } }, required: ["query"] } },
  // V.AIX Catalog tools
  { type: "function", name: "open_catalog", description: "Open V.AIX catalog, optionally filtered by category.", parameters: { type: "object", properties: { category: { type: "string", description: "Category name (e.g., 'Bếp từ', 'Khóa thông minh'). Empty for all products." } }, required: ["category"] } },
  { type: "function", name: "search_catalog", description: "Search V.AIX catalog for products.", parameters: { type: "object", properties: { query: { type: "string", description: "Search query (product name, brand, feature, price range)" } }, required: ["query"] } },
  { type: "function", name: "open_product", description: "Open a specific product detail in V.AIX.", parameters: { type: "object", properties: { product_id: { type: "string", description: "Product ID or title search" } }, required: ["product_id"] } },
  { type: "function", name: "navigate_catalog", description: "Navigate V.AIX catalog.", parameters: { type: "object", properties: { page: { type: "string", enum: ["products", "catalogue", "contact"], description: "Page to navigate to" }, data: { type: "object", description: "Additional data for navigation" } }, required: ["page"] } },
];

// ── DOM ──────────────────────────────────────────────────────────────────
const $ = (sel) => /** @type {HTMLElement} */ (document.querySelector(sel));
const stageNode = $("#stage");
const mainBtn = /** @type {HTMLButtonElement} */ ($("#main-btn"));
const mainBtnLabel = $("#main-btn-label");
const muteBtn = /** @type {HTMLButtonElement} */ ($("#mute-btn"));
const textModeBtn = /** @type {HTMLButtonElement} */ ($("#text-mode-btn"));
const caption = $("#caption");
const subtitles = $("#subtitles");
const loading = $("#loading");
const settingsBtn = /** @type {HTMLButtonElement} */ ($("#settings-btn"));
const settingsDialog = /** @type {HTMLDialogElement} */ ($("#settings"));
const inputVoice = /** @type {HTMLSelectElement} */ ($("#voice"));
const inputInstructions = /** @type {HTMLTextAreaElement} */ ($("#instructions"));
const inputDirectUrl = /** @type {HTMLInputElement} */ ($("#direct-url"));
const inputSubtitles = /** @type {HTMLInputElement} */ ($("#subtitles-toggle"));
const directUrlRow = $("#direct-url-row");
const textChat = /** @type {HTMLElement} */ ($("#text-chat"));
const chatHeader = /** @type {HTMLElement} */ ($("#chat-header"));
const chatMessages = /** @type {HTMLElement} */ ($("#chat-messages"));
const chatInput = /** @type {HTMLInputElement} */ ($("#chat-input"));
const chatSendBtn = /** @type {HTMLButtonElement} */ ($("#chat-send-btn"));
const chatCloseBtn = /** @type {HTMLButtonElement} */ ($("#chat-close-btn"));
const chatResizeHandle = /** @type {HTMLElement} */ ($("#chat-resize-handle"));
const chatAvatarSelect = /** @type {HTMLSelectElement} */ ($("#chat-avatar-select"));
const settingsAvatarSelect = /** @type {HTMLSelectElement} */ ($("#settings-avatar-select"));

// ── State (module-level) ─────────────────────────────────────────────────
const stage = new AvatarStage(stageNode);
/** @type {S2sWsRealtimeClient | null} */
let client = null;
let muted = false;
let subtitleTimer = 0;
let textMode = false;
/** @type {{ lb: boolean, allowDirect: boolean }} */
let config = { lb: false, allowDirect: true };
let avatarList = [];
let sessionInProgress = false;
let autoGreetingSent = false;
/** Pre-fetched short news hook */
let preFetchedGreeting = null;

function loadSettings() {
  return {
    voice: localStorage.getItem(STORAGE_KEYS.voice) || DEFAULT_VOICE,
    avatar: localStorage.getItem(STORAGE_KEYS.avatar) || "vuong.glb",
    instructions: localStorage.getItem(STORAGE_KEYS.instructions) || "",
    directUrl: localStorage.getItem(STORAGE_KEYS.directUrl) || "",
    subtitles: localStorage.getItem(STORAGE_KEYS.subtitles) === "1",
  };
}
let settings = loadSettings();

function saveSettings() {
  localStorage.setItem(STORAGE_KEYS.voice, settings.voice);
  localStorage.setItem(STORAGE_KEYS.avatar, settings.avatar);
  localStorage.setItem(STORAGE_KEYS.instructions, settings.instructions);
  localStorage.setItem(STORAGE_KEYS.directUrl, settings.directUrl);
  localStorage.setItem(STORAGE_KEYS.subtitles, settings.subtitles ? "1" : "0");
}

/**
 * Build system instructions sent to the backend.
 */
function effectiveInstructions(newsHook) {
  const now = new Date();
  const dateStr = now.toLocaleDateString("en-US", { weekday: "long", year: "numeric", month: "long", day: "numeric" });
  const timeStr = now.toLocaleTimeString("en-US", { hour: "2-digit", minute: "2-digit" });
  const dateLine = `Today is ${dateStr}. The current time is ${timeStr}.`;
  const extra = settings.instructions.trim();
  const newsInst = newsHook
    ? `\n\nWhen you start the conversation, greet the user naturally and briefly mention today's news hook: "${newsHook}"\nThen wait for their response. Keep your greeting to ONE short sentence.`
    : "";
  const base = `${dateLine}\n\n${DEFAULT_INSTRUCTIONS}${newsInst}`;
  return extra ? `${base}\n\nAdditional user instructions:\n${extra}` : base;
}

// ── Avatar list ──────────────────────────────────────────────────────────
async function fetchAvatarList() {
  try { const resp = await fetch("/api/avatars"); if (resp.ok) avatarList = (await resp.json()).avatars || []; } catch {}
}
function populateAvatarSelects(selectedName) {
  for (const sel of [chatAvatarSelect, settingsAvatarSelect]) {
    sel.innerHTML = "";
    const def = document.createElement("option"); def.value = ""; def.textContent = "(Default - Brunette)"; sel.appendChild(def);
    for (const name of avatarList) {
      const opt = document.createElement("option"); opt.value = name;
      opt.textContent = name.replace(/\.glb$/i, "").replace(/_/g, " ") + (name.toLowerCase() === "vuong.glb" ? " 🎙️" : "");
      sel.appendChild(opt);
    }
    if (selectedName && avatarList.includes(selectedName)) sel.value = selectedName;
  }
}
function setAvatarFromSelect(value) { settings.avatar = value || ""; saveSettings(); }
async function reloadAvatar() {
  if (!stage.head) return;
  loading.classList.remove("done"); loading.textContent = "Loading avatar...";
  try { await stage.init({ avatarUrl: settings.avatar ? `/avatars/${settings.avatar}` : undefined, onprogress: (ev) => { if (ev.lengthComputable) loading.textContent = `Loading avatar ${Math.min(100, Math.round((ev.loaded / ev.total) * 100))}%`; } }); } catch (err) { console.error(err); }
  loading.classList.add("done");
}

// ── Chat / captions ──────────────────────────────────────────────────────
function clampRect() {
  const vw = window.innerWidth, vh = window.innerHeight;
  const r = textChat.getBoundingClientRect();
  let l = r.left, t = r.top;
  l = Math.max(10, Math.min(l, vw - r.width - 10)); t = Math.max(10, Math.min(t, vh - r.height - 10));
  textChat.style.left = `${l}px`; textChat.style.top = `${t}px`;
}
function makeDraggable() {
  let dragging = false; let startX, startY, startLeft, startTop;
  function getPos(e) { const p = e.changedTouches ? e.changedTouches[0] : e; return { x: p.clientX, y: p.clientY }; }
  function onStart(e) { if (e.target.closest("#chat-header-actions") || e.target.closest("#chat-avatar-select")) return; const p = getPos(e); dragging = true; const rect = textChat.getBoundingClientRect(); startX = p.x; startY = p.y; startLeft = rect.left; startTop = rect.top; textChat.classList.add("dragging"); e.preventDefault(); }
  function onMove(e) { if (!dragging) return; const p = getPos(e); textChat.style.left = `${startLeft + p.x - startX}px`; textChat.style.top = `${startTop + p.y - startY}px`; textChat.style.right = "auto"; textChat.style.bottom = "auto"; e.preventDefault(); }
  function onEnd() { if (!dragging) return; dragging = false; textChat.classList.remove("dragging"); clampRect(); }
  chatHeader.addEventListener("mousedown", onStart); document.addEventListener("mousemove", onMove); document.addEventListener("mouseup", onEnd);
  chatHeader.addEventListener("touchstart", onStart, { passive: false }); document.addEventListener("touchmove", onMove, { passive: false }); document.addEventListener("touchend", onEnd);
}
function makeResizable() {
  let resizing = false; let startX, startY, startW, startH;
  function getPos(e) { const p = e.changedTouches ? e.changedTouches[0] : e; return { x: p.clientX, y: p.clientY }; }
  function onStart(e) { resizing = true; const rect = textChat.getBoundingClientRect(); const p = getPos(e); startX = p.x; startY = p.y; startW = rect.width; startH = rect.height; textChat.classList.add("resizing"); e.preventDefault(); e.stopPropagation(); }
  function onMove(e) { if (!resizing) return; const p = getPos(e); textChat.style.width = `${Math.max(260, startW + p.x - startX)}px`; textChat.style.height = `${Math.max(120, startH + p.y - startY)}px`; textChat.style.right = "auto"; textChat.style.bottom = "auto"; e.preventDefault(); }
  function onEnd() { if (!resizing) return; resizing = false; textChat.classList.remove("resizing"); }
  chatResizeHandle.addEventListener("mousedown", onStart); document.addEventListener("mousemove", onMove); document.addEventListener("mouseup", onEnd);
  chatResizeHandle.addEventListener("touchstart", onStart, { passive: false }); document.addEventListener("touchmove", onMove, { passive: false }); document.addEventListener("touchend", onEnd);
}
function setCaption(text, kind = "") { caption.textContent = text; caption.className = kind; }
function showSubtitles(text) { if (!settings.subtitles) return; clearTimeout(subtitleTimer); subtitles.textContent = text; subtitles.classList.add("visible"); }
function fadeSubtitles(delayMs = 2600) { clearTimeout(subtitleTimer); subtitleTimer = window.setTimeout(() => subtitles.classList.remove("visible"), delayMs); }
function addChatMessage(role, text) { const msg = document.createElement("div"); msg.className = `chat-message ${role}`; msg.textContent = text; chatMessages.appendChild(msg); chatMessages.scrollTop = chatMessages.scrollHeight; }
function showTextChat(show) { textChat.hidden = !show; if (show) chatInput.focus(); }

function sendTextViaSession(text) {
  if (!client) return false;
  const st = client._status;
  if (st !== "connected" && st !== "ai-speaking" && st !== "processing" && st !== "user-speaking") return false;
  setCaption("SENDING…"); client.sendUserText(text); client.requestResponse(); return true;
}

function sendTextMessage() {
  const text = chatInput.value.trim();
  if (!text) return;
  addChatMessage("user", text); chatInput.value = "";
  if (!client || !sessionInProgress) {
    void startTextSession(text); return;
  }
  if (!sendTextViaSession(text)) setCaption("QUEUED…");
}

if (chatCloseBtn) chatCloseBtn.addEventListener("click", (e) => { e.stopPropagation(); textMode = false; showTextChat(false); textModeBtn.classList.remove("active"); });

// ── Button ───────────────────────────────────────────────────────────────
let mainAction = "start";
function setMainButton(action, label) { mainAction = action; mainBtnLabel.textContent = label; mainBtn.disabled = action === "busy"; mainBtn.classList.toggle("live", action === "stop"); muteBtn.hidden = action !== "stop"; textModeBtn.hidden = false; }

const CAPTIONS = {
  idle: "TAP TO TALK", "creating-session": "REQUESTING A SLOT…", queued: "WAITING IN LINE…",
  "your-turn": "YOUR TURN, TAP TO JOIN", connecting: "CONNECTING…", connected: "GO AHEAD, I'M LISTENING",
  "user-speaking": "LISTENING", processing: "THINKING…", "ai-speaking": "SPEAKING",
  closed: "TAP TO TALK", error: "SOMETHING BROKE, TAP TO RETRY",
};

function onStatus(status) {
  stage.setConversationState(status);
  setCaption(CAPTIONS[status] ?? status, status === "error" ? "error" : status === "idle" || status === "closed" ? "" : "live");
  switch (status) {
    case "idle": case "closed": setMainButton("start", "Start talking"); break;
    case "error": setMainButton("start", "Retry"); break;
    case "creating-session": case "connecting": setMainButton("busy", "Connecting…"); break;
    case "queued": setMainButton("stop", "Leave queue"); break;
    case "your-turn": setMainButton("join", "Join now"); break;
    default: setMainButton("stop", "End conversation"); break;
  }
  if (status === "user-speaking") { subtitles.classList.remove("visible"); showTextChat(textMode); }
}

// ── Tool runner ──────────────────────────────────────────────────────────
function runTool(name, argsJson, callId) {
  if (!client) return;
  let args = {};
  try { args = JSON.parse(argsJson || "{}"); } catch {}
  if (name === "get_current_datetime") {
    const now = new Date();
    client.sendToolOutput(callId, `Current date/time: ${now.toLocaleDateString("en-US", { weekday: "long", year: "numeric", month: "long", day: "numeric" })} at ${now.toLocaleTimeString("en-US", { hour: "2-digit", minute: "2-digit", second: "2-digit" })}.`);
    client.requestResponse(); return;
  }
  if (name === "search_wikipedia") {
    const query = /** @type {string} */ (args.query || "");
    if (!query) { client.sendToolOutput(callId, `No query.`); client.requestResponse(); return; }
    fetch(`/api/wiki/summary?title=${encodeURIComponent(query.replace(/\s+/g, "_"))}`).then(r => r.json()).then(data => {
      if (data.extract) { client.sendToolOutput(callId, `From Wikipedia (${data.title}): ${data.extract}\nSource: ${data.url}`); client.requestResponse(); return; }
      fetch(`/api/wiki/search?q=${encodeURIComponent(query)}`).then(r => r.json()).then(sd => {
        if (!sd.results?.length) { client.sendToolOutput(callId, `No Wikipedia results for "${query}".`); client.requestResponse(); return; }
        fetch(`/api/wiki/summary?title=${encodeURIComponent(sd.results[0].title)}`).then(r => r.json()).then(sum => { client.sendToolOutput(callId, sum.extract ? `From Wikipedia (${sum.title}): ${sum.extract}\nSource: ${sum.url}` : `Wikipedia: ${sd.results.slice(0,3).map(r => `${r.title}: ${r.snippet}`).join("\n")}`); client.requestResponse(); });
      });
    }).catch(() => { client.sendToolOutput(callId, `Wikipedia search failed.`); client.requestResponse(); }); return;
  }
  if (name === "search_web") {
    const query = /** @type {string} */ (args.query || "");
    if (!query) { client.sendToolOutput(callId, `No query.`); client.requestResponse(); return; }
    fetch(`/api/web/search?q=${encodeURIComponent(query)}`).then(r => r.json()).then(data => {
      if (!data.results?.length) { client.sendToolOutput(callId, `No web results for "${query}".`); client.requestResponse(); return; }
      client.sendToolOutput(callId, `Web results for "${query}":\n${data.results.slice(0,3).map((r,i) => `${i+1}. ${r.title}\n   ${r.snippet}`).join("\n")}`);
      client.requestResponse();
    }).catch(() => { client.sendToolOutput(callId, `Web search failed.`); client.requestResponse(); }); return;
  }
  // V.AIX Catalog tools
  if (name === "open_catalog") {
    vaixFetchProducts().then(products => {
      const cat = args.category;
      let msg = `Đã mở danh mục V.AIX.`;
      if (cat) {
        const matched = products.filter(p => (p.category || "").toLowerCase().includes(cat.toLowerCase()));
        if (matched.length > 0) {
          msg = `Tìm thấy ${matched.length} sản phẩm trong "${cat}": ${matched.slice(0,3).map(p => p.title).join(", ")}.`;
        } else {
          msg = `Không tìm thấy sản phẩm nào trong "${cat}". Hãy thử danh mục khác.`;
        }
      }
      client.sendToolOutput(callId, msg);
      vaixPanel?.classList.add("open");
      vaixToggle?.classList.add("active");
      vaixPanelOpen = true;
      client.requestResponse();
    }).catch(err => {
      client.sendToolOutput(callId, `Không thể tải danh mục: ${err.message}`);
      client.requestResponse();
    }); return;
  }
  if (name === "open_product") {
    const pid = args.product_id;
    vaixFetchProducts().then(products => {
      if (!pid) { client.sendToolOutput(callId, `Cần product_id để mở sản phẩm.`); client.requestResponse(); return; }
      // First try exact SKU match
      const found = products.find(p => p.sku === pid || p.title === pid);
      let msg = found
        ? `Đã mở ${found.title} (${found.price ? `${found.price.toLocaleString("vi-VN")}đ` : "Liên hệ"}).`
        : `Không tìm thấy sản phẩm "${pid}". Hãy thử tên hoặc mã sản phẩm khác.`;
      client.sendToolOutput(callId, msg);
      client.requestResponse();
    }).catch(err => {
      client.sendToolOutput(callId, `Lỗi khi tìm sản phẩm: ${err.message}`);
      client.requestResponse();
    }); return;
  }
  if (name === "search_catalog") {
    const query = args.query;
    if (!query) {
      client.sendToolOutput(callId, `Cần từ khóa để tìm kiếm.`);
      client.requestResponse();
      return;
    }
    
    vaixSearch(query).then(data => {
      if (data.results?.length > 0) {
        const results = data.results.slice(0, 3);
        const details = results.map(r => {
          const p = r.product;
          return `${p.title} (${p.price ? `${p.price.toLocaleString("vi-VN")}đ` : "Liên hệ"})`;
        });
        client.sendToolOutput(callId, `Tìm thấy ${data.total} kết quả cho "${query}":\n${details.join(", ")}.`);
      } else {
        client.sendToolOutput(callId, `Không tìm thấy sản phẩm nào cho "${query}".`);
      }
      // Open panel to show results
      vaixPanel?.classList.add("open");
      vaixToggle?.classList.add("active");
      vaixPanelOpen = true;
      client.requestResponse();
    }).catch(err => {
      client.sendToolOutput(callId, `Lỗi tìm kiếm: ${err.message}`);
      client.requestResponse();
    }); return;
  }
  if (name === "navigate_catalog") {
    vaixFetchProducts().then(products => {
      let msg = `Đã mở danh mục V.AIX với ${products.length} sản phẩm.`;
      if (args.page === "products" || args.page === "contact") {
        msg = `Đã chuyển đến trang ${args.page}.`;
      }
      client.sendToolOutput(callId, msg);
      vaixPanel?.classList.add("open");
      vaixToggle?.classList.add("active");
      vaixPanelOpen = true;
      client.requestResponse();
    }).catch(err => {
      client.sendToolOutput(callId, `Lỗi điều hướng: ${err.message}`);
      client.requestResponse();
    }); return;
  }
  const result = stage.runTool(name, args) ?? `Unknown tool: ${name}`;
  client.sendToolOutput(callId, result); client.requestResponse();
}

async function connectSession(c) {
  try { await c.connect(); return c; }
  catch (err) {
    const code = /** @type {Error & {code?: string}} */ (err)?.code;
    if (code === "limit") setCaption("DAILY LIMIT REACHED, TRY AGAIN TOMORROW", "error");
    else if (code === "queue-full") setCaption("ALL SEATS TAKEN, TRY AGAIN", "error");
    else if (code === "join-expired") setCaption("SPOT EXPIRED, TAP TO RETRY", "error");
    else if (code !== "aborted") { console.error(err); setCaption("COULD NOT CONNECT, TAP TO RETRY", "error"); }
    await endSession(true); return null;
  }
}

async function startVoiceSession() {
  if (sessionInProgress) return;
  sessionInProgress = true;
  await stage.resume();
  let micStream;
  if (FAKEMIC_MODE) { const ctx = /** @type {AudioContext} */ (stage.audioCtx); micStream = ctx.createMediaStreamDestination().stream; }
  else { try { micStream = await navigator.mediaDevices.getUserMedia({ audio: { echoCancellation: true, noiseSuppression: true, autoGainControl: true } }); } catch { setCaption("MIC BLOCKED", "error"); sessionInProgress = false; return; } }
  const audioCtx = stage.audioCtx; const voiceSink = stage.voiceSink;
  if (!audioCtx || !voiceSink) { sessionInProgress = false; return; }
  const greeting = preFetchedGreeting || (await getHotNewsGreeting());
  const c = new S2sWsRealtimeClient({
    ...(config.lb ? { sessionUrl: "api/session" } : { directUrl: settings.directUrl }),
    voice: settings.voice, instructions: effectiveInstructions(greeting),
    micStream, audioContext: audioCtx, outputNode: voiceSink,
    workletBaseUrl: "/worklets/", tools: TOOL_DEFS, _textOnly: false,
  });
  client = c; _attachClientEvents(c);
  setCaption("REQUESTING A SLOT…");
  const ok = await connectSession(c);
  if (!ok) return;
  if (!autoGreetingSent) { c.requestResponse(); }
}

async function startTextSession(initialText) {
  if (sessionInProgress) { if (client && initialText) { client.sendUserText(initialText); client.requestResponse(); } return; }
  sessionInProgress = true;
  await stage.resume();
  const audioCtx = stage.audioCtx; const voiceSink = stage.voiceSink;
  if (!audioCtx || !voiceSink) { sessionInProgress = false; return; }
  const newsHook = preFetchedGreeting || (await getHotNewsGreeting());
  const c = new S2sWsRealtimeClient({
    ...(config.lb ? { sessionUrl: "api/session" } : { directUrl: settings.directUrl }),
    voice: settings.voice, instructions: effectiveInstructions(newsHook),
    audioContext: audioCtx, outputNode: voiceSink,
    workletBaseUrl: "/worklets/", tools: TOOL_DEFS, _textOnly: true,
  });
  client = c; _attachClientEvents(c);
  textMode = true; showTextChat(true); textModeBtn.classList.add("active");
  const ok = await connectSession(c);
  if (!ok) return;
  if (!autoGreetingSent) { c.requestResponse(); }
  if (initialText) { c.sendUserText(initialText); c.requestResponse(); }
}

function _attachClientEvents(c) {
  c.addEventListener("status", (e) => onStatus(/** @type {CustomEvent} */ (e).detail.status));
  c.addEventListener("queue", (e) => { const { position } = /** @type {CustomEvent} */ (e).detail; setCaption(position > 0 ? `#${position} IN LINE…` : "ALMOST THERE…", "live"); });
  c.addEventListener("transcript", (e) => {
    const { role, text } = /** @type {CustomEvent} */ (e).detail;
    if (role === "assistant" && text) { const normalized = smartNormalize(text); showSubtitles(normalized); addChatMessage("assistant", normalized); }
  });
  c.addEventListener("response-finished", () => { autoGreetingSent = true; fadeSubtitles(); });
  c.addEventListener("toolcall", (e) => { const { name, arguments: args, callId } = /** @type {CustomEvent} */ (e).detail; runTool(name, args, callId); });
  c.addEventListener("server-error", (e) => console.warn("server error:", /** @type {CustomEvent} */ (e).detail.error));
  c.addEventListener("error", () => { void endSession(); });
}

async function endSession(silent = false) {
  const c = client; client = null; sessionInProgress = false; autoGreetingSent = false;
  if (c) { if (c.options.micStream) for (const track of c.options.micStream?.getTracks() ?? []) track.stop(); await c.close().catch(() => {}); }
  stage.setConversationState("idle"); subtitles.classList.remove("visible");
  if (!silent) setCaption(CAPTIONS.idle); setMainButton("start", "Start talking");
}

// ── UI events ────────────────────────────────────────────────────────────
mainBtn.addEventListener("click", () => {
  if (mainAction === "start") {
    if (sessionInProgress) return;
    if (FAKEMIC_MODE) {
      void startTextSession();
    } else {
      void startVoiceSession();
    }
  }
  else if (mainAction === "join") { stage.resume(); client?.join(); }
  else if (mainAction === "stop") void endSession();
});
muteBtn.addEventListener("click", () => { muted = !muted; client?.setMuted(muted); muteBtn.classList.toggle("active", muted); muteBtn.setAttribute("aria-label", muted ? "Unmute microphone" : "Mute microphone"); });
textModeBtn.addEventListener("click", () => { textMode = !textMode; showTextChat(textMode); textModeBtn.classList.toggle("active", textMode); });
chatSendBtn.addEventListener("click", () => sendTextMessage());
chatInput.addEventListener("keypress", (e) => { if (e.key === "Enter") sendTextMessage(); });
chatAvatarSelect.addEventListener("change", () => { setAvatarFromSelect(chatAvatarSelect.value); void reloadAvatar(); });
settingsAvatarSelect.addEventListener("change", () => { setAvatarFromSelect(settingsAvatarSelect.value); chatAvatarSelect.value = settingsAvatarSelect.value; void reloadAvatar(); });
settingsBtn.addEventListener("click", () => { inputVoice.value = settings.voice; inputInstructions.value = settings.instructions; inputDirectUrl.value = settings.directUrl; inputSubtitles.checked = settings.subtitles; settingsAvatarSelect.value = chatAvatarSelect.value; settingsDialog.showModal(); });
settingsDialog.addEventListener("close", () => {
  settings = { voice: inputVoice.value || DEFAULT_VOICE, avatar: settingsAvatarSelect.value || "", instructions: inputInstructions.value, directUrl: inputDirectUrl.value.trim(), subtitles: inputSubtitles.checked };
  if (settings.avatar !== "vuong.glb") autoGreetingSent = false;
  saveSettings(); chatAvatarSelect.value = settings.avatar; if (!settings.subtitles) subtitles.classList.remove("visible"); client?.updateSession({ voice: settings.voice, instructions: effectiveInstructions(preFetchedGreeting || "") });
});
window.addEventListener("beforeunload", () => { client?.close(); });

// ── Boot ─────────────────────────────────────────────────────────────────
async function boot() {
  for (const v of VOICES) { const o = document.createElement("option"); o.value = v; o.textContent = v.replaceAll("_", " "); inputVoice.append(o); }
  try { const resp = await fetch("api/config"); if (resp.ok) config = { ...config, ...(await resp.json()) }; } catch {}
  directUrlRow.hidden = !config.allowDirect;
  await fetchAvatarList(); populateAvatarSelects(settings.avatar);
  makeDraggable(); makeResizable();
  setCaption("WAKING HER UP…"); setMainButton("busy", "Loading…");
  const newsPromise = (settings.avatar === "vuong.glb" || !settings.avatar) ? getHotNewsGreeting().catch(() => null) : Promise.resolve(null);
  try { await stage.init({ avatarUrl: settings.avatar ? `/avatars/${settings.avatar}` : undefined, onprogress: (ev) => { if (ev.lengthComputable) loading.textContent = `Loading avatar ${Math.min(100, Math.round((ev.loaded / ev.total) * 100))}%`; } }); }
  catch (err) { console.error(err); loading.textContent = "Avatar failed to load. Reload."; setCaption("AVATAR FAILED", "error"); return; }
  preFetchedGreeting = await newsPromise;
  loading.classList.add("done"); setCaption(CAPTIONS.idle); setMainButton("start", "Start talking");

  // Initialize V.AIX panel
  initVaixPanel();
}
void boot();