// BIG SALE Floating Promotion Module v1.1
// Integrates BIG SALE promotion button with product detail modal
// Compatible with bep40/vai-avatar2 space architecture
//
// CHANGES v1.1:
//  - Removed 6 BIG SALE products that have NO image and NO description in the
//    catalog dataset (bep40/grob-products-updated): K136A, MST-6667,
//    MOVS-10128, "BỘ LÀM SẠCH NHÀ BẾP", 901X, 642X. These fell back to emoji
//    placeholders / empty body in the detail modal. 25 -> 19 products.
//  - Fixed the share link. Previously it pointed to the production space
//    https://bep40-vai-avatar.hf.space/?product=<slug>, which (a) does not load
//    this big_sale module at all and (b) opens the catalog product at its
//    LISTED price (no BIG SALE discount). Now the share link is self-hosted
//    (?bigsale=<code> on the CURRENT page/origin), and a deep-link handler opens
//    the BIG SALE detail modal with the correct BIG SALE (discounted) price.

console.log('[BIG SALE] Module loaded (v1.1)');

// BIG SALE Product Data — 19 products with discount info
// (removed: K136A, MST-6667, MOVS-10128, BỘ LÀM SẠCH NHÀ BẾP, 901X, 642X)
const DEFAULT_BIG_SALE_PRODUCTS = [
  { stt: 1, code: "MC-7086HS",  name: "MÁY HÚT", category: "MÁY HÚT", qty: 3,  price: "11.389.000", discount: "45%", bigsale: "6.263.950", status: "HÀNG MỚI" },
  { stt: 2, code: "MH-70SMC",  name: "MÁY HÚT ECO", category: "MÁY HÚT", qty: 2,  price: "4.620.000", discount: "50%", bigsale: "2.310.000", status: "HÀNG MỚI" },
  { stt: 3, code: "MH-90SMC",  name: "MÁY HÚT ECO", category: "MÁY HÚT", qty: 4,  price: "5.060.000", discount: "50%", bigsale: "2.530.000", status: "HÀNG MỚI" },
  { stt: 4, code: "MH-600GT",  name: "MÁY HÚT", category: "MÁY HÚT", qty: 5,  price: "8.208.000", discount: "40%", bigsale: "4.924.800", status: "HÀNG MỚI" },
  { stt: 5, code: "AS-9602DG",  name: "BẾP 2 GAS", category: "BẾP GAS", qty: 2,  price: "7.815.000", discount: "40%", bigsale: "4.689.000", status: "HÀNG MỚI" },
  { stt: 6, code: "SMART K-450",  name: "CHẬU ĐÁ", category: "CHẬU ĐÁ", qty: 1,  price: "21.109.000", discount: "45%", bigsale: "11.609.950", status: "HÀNG MỚI" },
  { stt: 7, code: "MS-1022D",  name: "CHẬU RỰA", category: "CHẬU RỰA", qty: 4,  price: "5.852.000", discount: "40%", bigsale: "3.511.200", status: "HÀNG MỚI" },
  { stt: 8, code: "MS-2025",  name: "CHẬU RỰA", category: "CHẬU RỰA", qty: 1,  price: "5.700.000", discount: "45%", bigsale: "3.135.000", status: "HÀNG MỚI" },
  { stt: 9, code: "MS-6070",  name: "CHẬU RỰA", category: "CHẬU RỰA", qty: 11,  price: "6.464.000", discount: "40%", bigsale: "3.878.400", status: "HÀNG MỚI" },
  { stt: 10, code: "MS-5066W",  name: "CHẬU RỰA", category: "CHẬU RỰA", qty: 8,  price: "4.385.000", discount: "40%", bigsale: "2.631.000", status: "HÀNG MỚI" },
  { stt: 11, code: "MS-5082W",  name: "CHẬU RỰA", category: "CHẬU RỰA", qty: 3,  price: "6.350.000", discount: "40%", bigsale: "3.810.000", status: "HÀNG MỚI" },
  { stt: 12, code: "MS-862",  name: "CHẬU RỰA", category: "CHẬU RỰA", qty: 3,  price: "12.960.000", discount: "45%", bigsale: "7.128.000", status: "HÀNG MỚI" },
  { stt: 13, code: "MPC-5KCB",  name: "BỘ LỌC NƯỚC", category: "LỌC NƯỚC", qty: 1,  price: "10.702.000", discount: "40%", bigsale: "6.421.200", status: "HÀNG MỚI" },
  { stt: 14, code: "K061S",  name: "VÒI", category: "VÒI", qty: 10,  price: "3.056.000", discount: "40%", bigsale: "1.833.600", status: "HÀNG MỚI" },
  { stt: 15, code: "K569SN",  name: "VÒI ECO", category: "VÒI", qty: 2,  price: "3.520.000", discount: "45%", bigsale: "1.936.000", status: "HÀNG MỚI" },
  { stt: 16, code: "K525B",  name: "VÒI", category: "VÒI", qty: 2,  price: "2.916.000", discount: "45%", bigsale: "1.603.800", status: "HÀNG MỚI" },
  { stt: 17, code: "K130S",  name: "VÒI", category: "VÒI", qty: 4,  price: "4.104.000", discount: "45%", bigsale: "2.257.200", status: "HÀNG MỚI" },
  { stt: 18, code: "K501B",  name: "VÒI", category: "VÒI", qty: 2,  price: "5.076.000", discount: "45%", bigsale: "2.791.800", status: "HÀNG MỚI" },
  { stt: 19, code: "MMPM-657A",  name: "XAY TIÊU", category: "PHỤ KIỆN", qty: 34,  price: "295.000", discount: "60%", bigsale: "118.000", status: "HÀNG MỚI" }
].map(function(p, i){ return Object.assign({}, p, { stt: i + 1 }); });

// Runtime list (starts from DEFAULT, replaced by /api/promos when available).
let BIG_SALE_PRODUCTS = DEFAULT_BIG_SALE_PRODUCTS.slice().map(function(p, i){ return Object.assign({}, p, { stt: i + 1 }); });

// Expose BIG SALE data + opener so the self-hosted deep-link handler below and
// any other module can open a BIG SALE product by code.
window.BIG_SALE_PRODUCTS = BIG_SALE_PRODUCTS;

// Format VND currency
function formatVND(price) {
  const num = parseInt(price.replace(/\./g, ''));
  if (isNaN(num)) return price;
  return new Intl.NumberFormat('vi-VN', { style: 'currency', currency: 'VND' }).format(num);
}
// Plain digit-group format WITHOUT currency symbol (for BIGSALE price fields).
function fmtNum(n) {
  const num = Number(n || 0);
  if (!num) return '0';
  return num.toLocaleString('vi-VN');
}

// Build a product card HTML string
function buildProductCard(p) {
  const discountClass = p.discount.includes('7') ? 'discount-high' : 'discount-mid';
  // Try to get full product name from catalog
  var fullName = p.name;
  var imgSrc = p.image || '';
  try {
    if (window.vaix && typeof window.vaix.findProduct === 'function') {
      var matched = window.vaix.findProduct(String(p.code || ''));
      if (matched && (matched.title_clean || matched.name)) fullName = matched.title_clean || matched.name;
      if (!imgSrc) imgSrc = matched && (matched.image || (matched.images && matched.images[0])) ? (matched.image || matched.images[0]) : '';
    }
  } catch(e) {}
  return `
    <div class="big-sale-product" data-code="${p.code}" data-stt="${p.stt}">
      <div class="big-sale-product-header">
        <span class="big-sale-stt">S${p.stt}</span>
        <span class="big-sale-discount ${discountClass}">-${p.discount}</span>
      </div>
      ${imgSrc ? '<div class="big-sale-product-img" style="padding:2px 10px 0"><img src="'+imgSrc+'" alt="'+p.code+'" style="width:100%;height:96px;object-fit:cover;border-radius:10px;display:block;background:#f1f5f9" onerror="this.style.display=\'none\'"></div>' : ''}
      <div class="big-sale-product-name">${fullName}</div>
      <div class="big-sale-product-code">${p.code}</div>
      <div class="big-sale-product-meta">
        <span class="big-sale-qty">SL: ${p.qty}</span>
        <span class="big-sale-status">HÀNG MỚI</span>
      </div>
      <div class="big-sale-price-row">
        <span class="big-sale-price-original">${formatVND(p.price)}</span>
        <span class="big-sale-price-new">${formatVND(p.bigsale)}</span>
      </div>
      <div class="big-sale-card-actions" id="bsa-${p.code}" style="display:flex;gap:6px;margin-top:8px;flex-wrap:wrap"></div>
    </div>`;
}

// Create the floating button + panel
function createBigSaleElements() {
  // Check if already exists
  if (document.getElementById('big-sale-floating')) return;

  const floating = document.createElement('button');
  floating.id = 'big-sale-floating';
  floating.setAttribute('aria-label', 'Chương trình BIG SALE');
  floating.setAttribute('title', 'Chương trình BIG SALE');
  floating.innerHTML = `
    <div class="big-sale-btn-content">
      <span class="big-sale-badge">BIG SALE</span>
      <span class="big-sale-count">${BIG_SALE_PRODUCTS.length} SP</span>
    </div>
    <div class="big-sale-chevron">▼</div>
  `;

  const panel = document.createElement('div');
  panel.id = 'big-sale-panel';
  panel.setAttribute('role', 'dialog');
  panel.setAttribute('aria-label', 'Chương trình khuyến mãi BIG SALE');
  panel.innerHTML = `
    <div class="big-sale-panel-header">
      <div class="big-sale-panel-title">
        <span class="big-sale-panel-icon">🔥</span>
        <span>CHƯƠNG TRÌNH BIG SALE</span>
      </div>
      <div style="display:flex;align-items:center;gap:8px">
        <span class="big-sale-product-count">${BIG_SALE_PRODUCTS.length} sản phẩm</span>
        <button type="button" class="big-sale-list-share-btn" onclick="event.stopPropagation();window.shareBigSaleList()" style="padding:5px 10px;border:none;border-radius:8px;background:#f97316;color:#fff;font-size:0.68rem;font-weight:700;cursor:pointer;font-family:inherit;white-space:nowrap"><i class="fas fa-share-alt"></i> Chia sẻ danh sách</button>
      </div>
    </div>
    <div class="big-sale-product-list">
      ${BIG_SALE_PRODUCTS.map(p => buildProductCard(p)).join('')}
    </div>
    <div class="big-sale-panel-footer">
      <button class="big-sale-view-all-btn">Xem tất cả sản phẩm</button>
    </div>
  `;

    // Inject inline style for BIGSALE positioning
  var es = document.getElementById('bigsale-pos-style');
  if (!es) {
    es = document.createElement('style');
    es.id = 'bigsale-pos-style';
    es.textContent = '#big-sale-floating{position:fixed!important;right:18px!important;bottom:100px!important;z-index:9999!important;}#big-sale-panel{display:none;}#big-sale-panel.open{display:flex!important;}';
    document.head.appendChild(es);
  }
  document.body.appendChild(floating);
  document.body.appendChild(panel);

  attachBigSaleEventListeners(floating, panel);
}

// Event listeners
function attachBigSaleEventListeners(floating, panel) {
  let isOpen = false;

  floating.addEventListener('click', function(e) {
    e.stopPropagation();
    isOpen = !isOpen;
    panel.classList.toggle('open', isOpen);
    floating.classList.toggle('open', isOpen);
  });

  // Close when clicking outside
  document.addEventListener('click', function(e) {
    if (isOpen && !panel.contains(e.target) && !floating.contains(e.target)) {
      panel.classList.remove('open');
      floating.classList.remove('open');
      isOpen = false;
    }
  });

  // Product click → open detail modal (event delegation, survives panel refresh)
  panel.addEventListener('click', function(e) {
    var card = e.target.closest('.big-sale-product');
    if (!card) return;
    e.stopPropagation();
    var code = card.getAttribute('data-code');
    if (!code) return;
    var norm = function (s) { return String(s || '').trim().toUpperCase().replace(/\s+/g, ' '); };
    var target = norm(code);
    var product = BIG_SALE_PRODUCTS.find(function(p) { return norm(p.code) === target; });
    if (!product && window.BIG_SALE_PRODUCTS) {
      product = window.BIG_SALE_PRODUCTS.find(function(p) { return norm(p.code) === target; });
    }
    if (product) {
      openBigSaleDetail(product);
    }
  });

  // "Xem tất cả" button
  const viewAllBtn = panel.querySelector('.big-sale-view-all-btn');
  if (viewAllBtn) {
    viewAllBtn.addEventListener('click', function(e) {
      e.stopPropagation();
      closeBigSalePanel();
      if (window.vaistudioToggle && typeof window.vaistudioToggle === 'function') {
        window.vaistudioToggle();
      } else {
        const toggle = document.getElementById('vaistudio-toggle');
        if (toggle) toggle.click();
      }
    });
  }
}

// Open vaistudio detail modal with BIG SALE product info
function openBigSaleDetail(product) {
  const overlay = document.getElementById('vaistudio-detail-overlay');
  const modal = document.getElementById('vaistudio-detail-modal');
  if (!overlay || !modal) return;
  // ── BIG SALE → Malloca product match ──
  // If this BIG SALE code exists in the live catalog, reuse the real product's
  // gallery/specs/subtitle but keep the BIG SALE price. Falls back to the
  // standalone BIG SALE card when there is no match.
  let matched = null;
  try { if (window.vaix && typeof window.vaix.findProduct === 'function' && product && product.code) matched = window.vaix.findProduct(String(product.code)); } catch (e) { matched = null; }

  // Set product title and code
  const titleEl = document.getElementById('detail-title');
  const modelEl = document.getElementById('detail-model');
  const brandEl = document.getElementById('detail-brand');
  const priceEl = document.getElementById('detail-price');

  if (titleEl) titleEl.textContent = matched ? (matched.title_clean || matched.name || product.name) : product.name;
  if (modelEl) modelEl.textContent = `Mã: ${product.code}`;
  if (brandEl) {
    brandEl.textContent = matched ? (matched.brand || product.category) : product.category;
    brandEl.style.background = '#fff1f2';
    brandEl.style.color = '#e11d48';
  }
  if (priceEl) {
    priceEl.innerHTML = `
      <div style="display:flex;align-items:center;gap:8px;flex-wrap:wrap">
        <span style="color:#c2410c;font-size:1.3rem;font-weight:800">${formatVND(product.bigsale)}</span>
        <span style="font-size:0.8rem;color:#64748b;text-decoration:line-through">${formatVND(product.price)}</span>
        <span style="font-size:0.85rem;background:#fef3c7;color:#92400e;padding:4px 10px;border-radius:8px;font-weight:700">-${product.discount}</span>
      </div>
    `;
  }

  // Set images: full gallery via renderDetailImages (scrollable + zoom)
  const imagesEl = document.getElementById('detail-images');
  if (imagesEl) {
    const gal = (matched && (matched.images && matched.images.length ? matched.images : (matched.image ? [matched.image] : []))) || (product.image ? [product.image] : []);
    const synthetic = { image: gal[0] || '', images: gal, slug: (matched&&matched.slug)||'', title_clean: (matched&&matched.title_clean)||product.name };
    if (typeof renderDetailImages === 'function') {
      renderDetailImages(synthetic);
      if (window.vaix && typeof window.vaix.ensureGallery === 'function') {
        setTimeout(function(){ try { window.vaix.ensureGallery().then(function(){ renderDetailImages(synthetic); }); } catch(e){} }, 200);
      }
    } else if (gal.length) {
      imagesEl.innerHTML = gal.map(function(u){ return '<img src="'+u+'" alt="'+product.code+'" style="flex:1;min-width:120px;height:120px;border-radius:10px;object-fit:cover;border:1px solid #e2e8f0;background:#f1f5f9" onerror="this.style.display=\'none\'">'; }).join('');
    } else {
      imagesEl.innerHTML = '<div style="flex:1;min-width:120px;height:120px;background:linear-gradient(135deg,#f1f5f9,#e2e8f0);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:2.5rem">'+(getCategoryEmoji(product.category))+'</div>';
    }
  }

  // Show BIG SALE pricing info in summary
  const summaryEl = document.getElementById('detail-summary');
  if (summaryEl) {
    summaryEl.style.display = 'block';
    summaryEl.innerHTML = `
      <div style="margin-bottom:8px"><strong>🔥 Giá BigSale:</strong> ${formatVND(product.bigsale)}</div>
      <div style="margin-bottom:8px"><strong>💰 Giá bán lẻ:</strong> ${formatVND(product.price)} → <span style="color:#c2410d;font-weight:700">${formatVND(product.bigsale)}</span></div>
      <div style="margin-bottom:8px"><strong>🏷️ Chiết khấu:</strong> <span style="color:#dc2626;font-weight:700">-${product.discount}</span></div>
      <div style="margin-bottom:8px"><strong>📦 Tình trạng:</strong> <span style="color:#16a34a;font-weight:600">${product.status}</span></div>
      <div><strong>💡 Danh mục:</strong> ${product.category}</div>
    `;
  }

  // Hide features and specs sections
  const featuresEl = document.getElementById('detail-features');
  const specsEl = document.getElementById('detail-specs');
  if (featuresEl) featuresEl.style.display = 'none';
  if (specsEl) specsEl.style.display = 'none';

  // ── Action buttons: Chia sẻ / Hỏi AI / Thêm giỏ hàng / Báo giá ──
  // BIG SALE products open through this modal but, unlike catalog products
  // (renderDetail in vaix-rag.js), they were NOT being given the share /
  // ask-AI / add-to-cart action row. Wire it here so every BIG SALE product
  // gets the same actionable buttons as catalog products.
  try { setupBigSaleDetailButtons(product, matched); } catch (e) { console.warn('[BIG SALE] detail buttons:', e); }

  // CRITICAL: keep the BIG SALE price as THE detail price. The catalog modal's
  // reapplyCk() re-renders #detail-price from window.lastShownProduct when the
  // customer CK changes — if lastShownProduct were the matched catalog product
  // (no promo flag), reapplyCk would overwrite the BIG SALE price with a CK
  // price. Point it at the synthetic BIG SALE product (promo:'bigsale',
  // noCk:true) so _ckPrice() returns null and the discount price survives.
  window.lastShownProduct = bigSaleAsProduct(product, matched);
  window.currentContextProduct = window.lastShownProduct;

  overlay.style.display = 'flex';

  // Close vaistudio panel if open
  const vaistudioPanel = document.getElementById('vaistudio-panel');
  if (vaistudioPanel && vaistudioPanel.classList.contains('open')) {
    vaistudioPanel.classList.remove('open');
    const toggle = document.getElementById('vaistudio-toggle');
    if (toggle) toggle.classList.remove('open');
  }
}

// Build a synthetic product object for the BIG SALE card so we can reuse the
// catalog modal's own button helpers (share / ask-AI / add-to-cart / quote).
function bigSaleAsProduct(product, matched) {
  const priceNum = parseInt(String(product.bigsale || '').replace(/\./g, ''), 10) || 0;
  const code = product.code || '';
  const slug = (matched && (matched.slug || matched.sku)) || code;
  return {
    slug: slug,
    sku: matched && (matched.sku || matched.model) ? (matched.sku || matched.model) : code,
    model: (matched && matched.model) || '',
    title_clean: (matched && (matched.title_clean || matched.name)) || product.name || code,
    name: (matched && (matched.title_clean || matched.name)) || product.name || code,
    brand: (matched && matched.brand) || product.category || '',
    priceNum: priceNum,
    price: product.bigsale || '',
    image: (matched && (matched.image || (matched.images && matched.images[0]))) || '',
    summary: (matched && (matched.summary || matched.description)) || ('🔥 Giá BIG SALE: ' + product.bigsale + ' (giảm ' + product.discount + ')'),
    features: [],
    specs: {},
    noCk: true,
    promo: 'bigsale'
  };
}

// Build the self-hosted BIG SALE share link for a given BIG SALE product.
// Points to the CURRENT page/origin with ?bigsale=<code> so it opens the BIG
// SALE detail modal at the discounted price (NOT the catalog listed price and
// NOT the unrelated production space).
function bigSaleShareUrl(product) {
  var base = window.location.origin + window.location.pathname;
  return base + '?bigsale=' + encodeURIComponent((product && product.code) || '');
}

// Per-card "Chia sẻ link" (SEO share). Copies the self-hosted SEO link to the
// clipboard and shows a toast. Exposed on window because the list cards are
// built as HTML strings with inline onclick.
window.shareBigSale = function (code) {
  try {
    var url = bigSaleShareUrl({ code: code });
    var copy = function (u) {
      if (window.navigator && navigator.clipboard && navigator.clipboard.writeText) {
        navigator.clipboard.writeText(u).then(function(){
          if (typeof window.toast === 'function') window.toast('✓ Đã copy link chia sẻ BIG SALE');
          else alert('Link chia sẻ BIG SALE (SEO):\n' + u);
        }).catch(function(){ window.prompt('Link chia sẻ BIG SALE:', u); });
      } else { window.prompt('Link chia sẻ BIG SALE:', u); }
    };
    copy(url);
  } catch (err) {
    alert('Lỗi chia sẻ: ' + (err && err.message || err));
  }
};

// Create/re-ensure the share + add-to-cart + quote buttons in the BIG SALE
// detail modal. These mirror the catalog modal's detail-cart-section /
// detail-share-section so behaviour (addToCart / openQuotation / shareProduct /
// openAskAIForProduct) is identical for BIG SALE products.
function setupBigSaleDetailButtons(product, matched) {
  const p = bigSaleAsProduct(product, matched);

  // Share button
  let shareSection = document.getElementById('detail-share-section');
  if (!shareSection) {
    shareSection = document.createElement('div');
    shareSection.id = 'detail-share-section';
    shareSection.style.cssText = 'padding:10px 16px 4px;display:block';
    shareSection.innerHTML = '<button id="detail-share-btn" style="display:inline-flex;align-items:center;gap:6px;padding:8px 16px;background:#f0f9ff;color:#003f62;border:1px solid #b8d4e8;border-radius:8px;cursor:pointer;font-size:0.78rem;font-family:inherit;font-weight:600;transition:all 0.2s"><i class="fas fa-share-alt"></i> Chia sẻ sản phẩm</button>';
    const specsEl = document.getElementById('detail-specs');
    if (specsEl && specsEl.nextSibling) specsEl.parentNode.insertBefore(shareSection, specsEl.nextSibling);
    else document.getElementById('vaistudio-detail-modal').appendChild(shareSection);
  }

  // Cart + Quote buttons
  let cartSection = document.getElementById('detail-cart-section');
  if (!cartSection) {
    cartSection = document.createElement('div');
    cartSection.id = 'detail-cart-section';
    cartSection.style.cssText = 'padding:8px 16px 2px;display:flex;gap:8px;flex-wrap:wrap';
    cartSection.innerHTML =
      '<button id="detail-addcart-btn" style="flex:1;min-width:140px;display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:12px 16px;background:#25d366;color:#fff;border:none;border-radius:10px;cursor:pointer;font-size:0.85rem;font-family:inherit;font-weight:700;transition:all 0.2s"><i class="fas fa-shopping-cart"></i> Thêm giỏ hàng</button>'
      + '<button id="detail-quote-btn" style="flex:1;min-width:120px;display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:12px 16px;background:#003f62;color:#fff;border:none;border-radius:10px;cursor:pointer;font-size:0.85rem;font-family:inherit;font-weight:700;transition:all 0.2s"><i class="fas fa-file-invoice"></i> Báo giá</button>';
    const specsEl2 = document.getElementById('detail-specs');
    if (specsEl2 && specsEl2.nextSibling) specsEl2.parentNode.insertBefore(cartSection, specsEl2.nextSibling);
    else document.getElementById('vaistudio-detail-modal').appendChild(cartSection);
  }

  // Wire handlers
  const shareBtn = document.getElementById('detail-share-btn');
  if (shareBtn) {
    shareBtn.onclick = function (e) {
      e.stopPropagation();
      try {
        // Build the share text + self-hosted BIG SALE link ourselves (not the
        // catalog's getShareLink which would point to the listed-price deep link).
        var url = bigSaleShareUrl(product);
        var shareText = '🛒 ' + p.title_clean + '\n💰 ' + (p.priceNum > 0 ? p.priceNum.toLocaleString('vi-VN') + '₫' : 'Liên hệ');
        if (p.brand) shareText += '\n🏷️ ' + p.brand;
        shareText += '\n🔥 Giá BIG SALE: ' + (product.bigsale || '') + ' (-' + (product.discount || '') + ')';
        shareText += '\n\n' + url;
        if (navigator.share) { navigator.share({ title: p.title_clean, text: shareText, url: url }).catch(function () {}); }
        else { navigator.clipboard.writeText(shareText).then(function () { (window.showShareToast || function () {})( 'Đã sao chép link chia sẻ: ' + p.title_clean); }).catch(function () { prompt('Sao chép link chia sẻ:', url); }); }
      } catch (e) { console.warn('[BIG SALE] share:', e); }
    };
  }

  const addCartBtn = document.getElementById('detail-addcart-btn');
  if (addCartBtn) {
    addCartBtn.onclick = function (e) {
      e.stopPropagation();
      const prodObj = { slug: p.slug || '', sku: p.sku || '', name: p.title_clean || p.name || '', brand: p.brand || '', price: p.priceNum, priceNum: p.priceNum, image: p.image || '', noCk: true, promo: 'bigsale' };
      if (window.addToCart) window.addToCart(prodObj);
      addCartBtn.innerHTML = '<i class="fas fa-check"></i> Đã thêm!';
      addCartBtn.style.background = '#166534';
      const self = this;
      setTimeout(function () { self.innerHTML = '<i class="fas fa-shopping-cart"></i> Thêm giỏ hàng'; self.style.background = '#25d366'; }, 1500);
    };
  }

  const quoteBtn = document.getElementById('detail-quote-btn');
  if (quoteBtn) { quoteBtn.onclick = function (e) { e.stopPropagation(); if (window.openQuotation) window.openQuotation(); }; }

  // Hỏi AI — ask the avatar about THIS product (mirrors catalog openAskAIForProduct).
  let askSection = document.getElementById('detail-asksale-section');
  if (!askSection) {
    askSection = document.createElement('div');
    askSection.id = 'detail-asksale-section';
    askSection.style.cssText = 'padding:2px 16px 10px;display:block';
    askSection.innerHTML = '<button id="detail-asksale-btn" style="display:inline-flex;align-items:center;gap:6px;padding:8px 16px;background:linear-gradient(135deg,#7c3aed,#a78bfa);color:#fff;border:none;border-radius:8px;cursor:pointer;font-size:0.78rem;font-family:inherit;font-weight:600;transition:all 0.2s"><i class="fas fa-robot"></i> Hỏi AI về sản phẩm</button>';
    const cartSectionEl = document.getElementById('detail-cart-section');
    if (cartSectionEl && cartSectionEl.nextSibling) askSection = cartSectionEl.parentNode.insertBefore(askSection, cartSectionEl.nextSibling);
    else document.getElementById('vaistudio-detail-modal').appendChild(askSection);
  }
  const askBtn = document.getElementById('detail-asksale-btn');
  if (askBtn) {
    askBtn.onclick = function (e) {
      e.stopPropagation();
      if (window.vaix && window.vaix.openAskAIForProduct) {
        window.vaix.openAskAIForProduct(p);
      } else {
        const q = 'Cho em hỏi chi tiết về sản phẩm ' + p.title_clean + '. Cho em biết giá, đặc điểm nổi bật và ưu đãi BIG SALE nhé.';
        if (window.sendAsUserQuestion) window.sendAsUserQuestion(q);
        else if (window._triggerSuggestionSend) window._triggerSuggestionSend(q);
      }
    };
  }
}

// Get emoji for category
function getCategoryEmoji(category) {
  const map = {
    "MÁY HÚT": "🧹",
    "BẾP GAS": "🔥",
    "CHẬU ĐÁ": "🧊",
    "CHẬU RỰA": "🚰",
    "LỌC NƯỚC": "💧",
    "VÒI": "🚿",
    "PHỤ KIỆN": "🧰"
  };
  return map[category] || "📦";
}

// Close BIG SALE panel
function closeBigSalePanel() {
  const panel = document.getElementById('big-sale-panel');
  const floating = document.getElementById('big-sale-floating');
  if (panel) panel.classList.remove('open');
  if (floating) floating.classList.remove('open');
}

// ── Self-hosted BIG SALE deep link (?bigsale=<code>) ──
// When a shared BIG SALE link is opened, open the BIG SALE detail modal at the
// discounted price. Waits for the detail modal DOM + this module to be ready,
// then opens the product. Uses ?bigsale= (not ?product=) so it never collides
// with the catalog deep-link handler in greeting-news.js/vaix-rag.js.
function dismissWelcomeForBigSale() {
  try {
    var wm = document.getElementById('welcome-modal');
    if (wm) { wm.classList.remove('show'); wm.style.display = 'none'; }
    var ids = ['topbar','controls','subtitles','vaistudio-toggle','text-chat'];
    for (var i = 0; i < ids.length; i++) {
      var el = document.getElementById(ids[i]);
      if (el) { el.style.display = ''; el.hidden = false; }
    }
    var ld = document.getElementById('loading');
    if (ld) ld.classList.add('done');
    var av = document.getElementById('avatar-picker-modal');
    if (av) { av.classList.remove('show'); av.style.display = 'none'; }
    try {
      var panel = document.getElementById('vaistudio-panel');
      var toggle = document.getElementById('vaistudio-toggle');
      if (panel) { panel.classList.add('open'); panel.style.display = 'flex'; }
      if (toggle) toggle.classList.add('active');
    } catch (_e) {}
  } catch (e) { /* never block */ }
}

function handleBigSaleUrlParam() {
  try {
    var params = new URLSearchParams(location.search);
    var code = params.get('bigsale') || '';
    if (!code) return;
    // ?bigsale=all → open the FULL list (not a single product).
    var codeNorm = String(code).trim().toUpperCase().replace(/\s+/g, ' ');
    if (codeNorm === 'ALL' || codeNorm === 'DANHSACH' || codeNorm === 'LIST') {
      var triesAll = 0;
      var ivAll = setInterval(function () {
        triesAll++;
        try {
          if (document.getElementById('big-sale-floating')) {
            if (!document.getElementById('big-sale-panel')) initBigSale();
            dismissWelcomeForBigSale();
            openBigSalePanel();
            clearInterval(ivAll);
            return;
          }
        } catch (e) {}
        if (triesAll > 40) clearInterval(ivAll);
      }, 500);
      return;
    }
    var tries = 0;
    var iv = setInterval(function () {
      tries++;
      try {
        var modal = document.getElementById('vaistudio-detail-modal');
        // Normalize the code (uppercase, collapse spaces) for matching.
        var norm = function (s) { return String(s || '').trim().toUpperCase().replace(/\s+/g, ' '); };
        var target = norm(code);
        var product = BIG_SALE_PRODUCTS.find(function (p) { return norm(p.code) === target; });
        if (!product && window.BIG_SALE_PRODUCTS) {
          product = window.BIG_SALE_PRODUCTS.find(function (p) { return norm(p.code) === target; });
        }
        if (modal && product && typeof openBigSaleDetail === 'function') {
          // Make sure the floating panel/module is initialized (creates panel).
          if (!document.getElementById('big-sale-floating')) initBigSale();
          dismissWelcomeForBigSale();
          openBigSaleDetail(product);
          try {
            if (window.vaix && typeof window.vaix.openAskAIForProduct === 'function') {
              const matchedBS = (window.vaix && typeof window.vaix.findProduct === 'function') ? window.vaix.findProduct(String(code)) : null;
              const p = (typeof bigSaleAsProduct === 'function') ? bigSaleAsProduct(product, matchedBS) : null;
              if (p) window.vaix.openAskAIForProduct(p);
            }
          } catch(e) {}
          clearInterval(iv);
          return;
        }
      } catch (e) {
        if (tries > 40) clearInterval(iv);
      }
      if (tries > 60) clearInterval(iv); // give up after ~30s (catalog may be slow)
    }, 500);
  } catch (e) { /* never block */ }
}

// Ensure the BIGSALE floating button shows even on discount-link pages (?kh=...)
function ensureBigSaleButton() {
  var existing = document.getElementById('big-sale-floating');
  if (existing) {
    existing.style.display = '';
    var panel = document.getElementById('big-sale-panel');
    if (panel && panel.classList.contains('open')) { panel.style.display = ''; }
    return;
  }
  if (typeof initBigSale === 'function') {
    try { initBigSale(); } catch(e) {}
    return;
  }
  var _retry = 0;
  var _iv = setInterval(function() {
    _retry++;
    if (typeof initBigSale === 'function') {
      clearInterval(_iv);
      try { initBigSale(); } catch(e) {}
    } else if (_retry > 30) {
      clearInterval(_iv);
    }
  }, 300);
}
window.ensureBigSaleButton = ensureBigSaleButton;

// Initialize when DOM is ready
// ── Dynamic BIG SALE data (from Promo CMS /api/promos) ──
// Replaces the runtime list with admin-managed BIGSALE products. Falls back to
// DEFAULT_BIG_SALE_PRODUCTS when the API is unavailable. Emits an event so the
// panel can re-render without a page reload.
function loadBigSaleProducts(force) {
  if (force !== true && _bigsaleLoaded) return Promise.resolve(BIG_SALE_PRODUCTS);
  return fetch('/api/promos', { method: 'GET', cache: 'no-store' })
    .then(function (r) {
      if (!r.ok) throw new Error('HTTP ' + r.status);
      return r.json();
    })
    .then(function (d) {
      var list = (d && Array.isArray(d.bigsale)) ? d.bigsale : null;
      if (list && list.length) {
        BIG_SALE_PRODUCTS = list.slice().map(function (p, i) { return Object.assign({}, p, { stt: i + 1 }); });
      } else if (list && list.length === 0 && force === true) {
        // Admin explicitly emptied the BIGSALE list — respect it.
        BIG_SALE_PRODUCTS = [];
      }
      // Auto-merge catalog products whose discount is >= 40% (BIGSALE tier).
      // Tagged _auto:true so they are NOT deletable via the promo API.
      try {
        var cat = (window.vaix && typeof window.vaix.allProducts === 'function') ? window.vaix.allProducts() : [];
        var normCode = function (s) { return String(s || '').trim().toUpperCase().replace(/\s+/g, ' '); };
        var have = {};
        for (var h = 0; h < BIG_SALE_PRODUCTS.length; h++) { var hk = normCode(BIG_SALE_PRODUCTS[h].code) || normCode(BIG_SALE_PRODUCTS[h].name); if (hk) have[hk] = 1; }
        var added = 0;
        for (var ci = 0; ci < cat.length && added < 30; ci++) {
          var p2 = cat[ci];
          if (p2._deleted || p2.deleted) continue;
          var ln = Number(p2.listPn) || (p2.listPrice ? parseInt(String(p2.listPrice).replace(/[^\d]/g, ''), 10) : 0) || 0;
          var sn = Number(p2.salePn) || (p2.salePrice ? parseInt(String(p2.salePrice).replace(/[^\d]/g, ''), 10) : 0) || Number(p2.priceNum) || 0;
          if (!ln || !sn || ln <= sn) continue;
          var disc = Math.round((ln - sn) / ln * 100);
          if (disc < 40) continue;
          var ck = normCode(p2.sku || p2.model || p2.code || '');
          if (!ck) ck = normCode(p2.title_clean || p2.name || '');
          if (!ck || have[ck]) continue;
          have[ck] = 1;
          BIG_SALE_PRODUCTS.push({
            stt: BIG_SALE_PRODUCTS.length + 1, code: p2.sku || p2.model || p2.code || ck,
            name: (p2.title_clean || p2.name || '').toUpperCase(), category: p2.category || p2.category_slug || '',
            price: fmtNum(ln), bigsale: fmtNum(sn), discount: disc + '%', status: 'AUTO', image: p2.image || (p2.images && p2.images[0]) || '',
            _auto: true
          });
          added++;
        }
      } catch (e) {}
      window.BIG_SALE_PRODUCTS = BIG_SALE_PRODUCTS;
      _bigsaleLoaded = true;
      refreshBigSalePanel();
      return BIG_SALE_PRODUCTS;
    })
    .catch(function () {
      return BIG_SALE_PRODUCTS;
    });
}
let _bigsaleLoaded = false;

// Re-render the floating panel in place (preserve open state).
function refreshBigSalePanel() {
  try {
    var panel = document.getElementById('big-sale-panel');
    var floating = document.getElementById('big-sale-floating');
    if (!panel || !floating) return;
    var wasOpen = panel.classList.contains('open');
    var listEl = panel.querySelector('.big-sale-product-list');
    var countEl = panel.querySelector('.big-sale-product-count');
    var countBadge = floating.querySelector('.big-sale-count');
    if (listEl) listEl.innerHTML = BIG_SALE_PRODUCTS.map(function (p) { return buildProductCard(p); }).join('');
    if (countEl) countEl.textContent = BIG_SALE_PRODUCTS.length + ' sản phẩm';
    if (countBadge) countBadge.textContent = BIG_SALE_PRODUCTS.length + ' SP';
    if (wasOpen) panel.classList.add('open'); else panel.classList.remove('open');
    injectBigSaleAdminActions();
  } catch (e) {}
}

// ── List-level share (toàn bộ danh sách BIG SALE) ──
// Copies a self-hosted deep link (?bigsale=all) that opens the FULL BIG SALE
// panel — NOT a single product. Replaces the old per-product share.
window.shareBigSaleList = function () {
  var base = window.location.origin + window.location.pathname;
  var url = base + '?bigsale=all';
  var done = function () {
    if (typeof window.toast === 'function') window.toast('✓ Đã copy link chia sẻ danh sách BIG SALE');
    else alert('Link chia sẻ danh sách BIG SALE:\n' + url);
  };
  if (window.navigator && navigator.clipboard && navigator.clipboard.writeText) {
    navigator.clipboard.writeText(url).then(done).catch(function () { window.prompt('Link chia sẻ danh sách BIG SALE:', url); });
  } else { window.prompt('Link chia sẻ danh sách BIG SALE:', url); }
};

// Open the full BIG SALE panel (used by ?bigsale=all deep link).
function openBigSalePanel() {
  try {
    var panel = document.getElementById('big-sale-panel');
    var floating = document.getElementById('big-sale-floating');
    if (panel) panel.classList.add('open');
    if (floating) floating.classList.add('open');
  } catch (e) {}
}
window.openBigSalePanel = openBigSalePanel;

// Admin-only delete for a BIG SALE item (permanent, via /api/delete-promo).
async function deleteBigSaleProduct(code) {
  try {
    var isAdmin = (typeof window.isVaAdmin === 'function') ? window.isVaAdmin() : false;
    if (!isAdmin) { alert('🔒 Cần nhập mã V.AISTUDIO trên trang chủ.'); return; }
    if (!window.confirm('Xóa sản phẩm ' + code + ' khỏi danh sách BIG SALE?')) return;
    var r = await fetch('/api/delete-promo', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', 'x-vai-admin': '1' },
      body: JSON.stringify({ type: 'bigsale', key: code })
    });
    var d = await r.json().catch(function () { return {}; });
    if (!r.ok) { alert('❌ ' + (d.error || 'Lỗi xóa')); return; }
    if (window.toast) window.toast('✓ Đã xóa khỏi BIG SALE');
    loadBigSaleProducts(true);
  } catch (e) { alert('❌ Lỗi xóa: ' + (e && e.message || e)); }
}
window.deleteBigSaleProduct = deleteBigSaleProduct;

// Inject admin delete buttons into every BIG SALE card (after each render).
function injectBigSaleAdminActions() {
  try {
    var isAdmin = (typeof window.isVaAdmin === 'function') ? window.isVaAdmin() : false;
    if (!isAdmin) return;
    var panel = document.getElementById('big-sale-panel');
    if (!panel) return;
    var norm = function (s) { return String(s || '').trim().toUpperCase().replace(/\s+/g, ' '); };
    var cards = panel.querySelectorAll('.big-sale-product');
    for (var i = 0; i < cards.length; i++) {
      var card = cards[i];
      var code = card.getAttribute('data-code') || '';
      if (!code) continue;
      // Auto-merged catalog items are NOT admin-managed → no delete button.
      var isAuto = false;
      for (var k = 0; k < BIG_SALE_PRODUCTS.length; k++) {
        if (norm(BIG_SALE_PRODUCTS[k].code) === norm(code)) { isAuto = !!BIG_SALE_PRODUCTS[k]._auto; break; }
      }
      if (isAuto) continue;
      var actions = card.querySelector('.big-sale-card-actions');
      if (!actions || actions.querySelector('.bs-del-btn')) continue;
      var del = document.createElement('button');
      del.type = 'button';
      del.className = 'bs-del-btn';
      del.innerHTML = '<i class="fas fa-trash"></i> Xóa';
      del.style.cssText = "flex:1;padding:6px 8px;border:none;border-radius:8px;background:#dc2626;color:#fff;font-size:0.7rem;font-weight:700;cursor:pointer;font-family:inherit;display:inline-flex;align-items:center;justify-content:center;gap:5px";
      del.addEventListener('click', function (e) {
        e.stopPropagation();
        window.deleteBigSaleProduct(code);
      });
      actions.appendChild(del);
    }
  } catch (e) {}
}

function initBigSale() {
  createBigSaleElements();
  console.log('[BIG SALE] Floating promotion initialized with ' + BIG_SALE_PRODUCTS.length + ' products');
  // Load admin-managed BIGSALE products from the Promo CMS backend.
  loadBigSaleProducts().then(function (list) {
    console.log('[BIG SALE] Dynamic list loaded: ' + list.length + ' products');
    injectBigSaleAdminActions();
    handleBigSaleUrlParam();
  }).catch(function () {
    injectBigSaleAdminActions();
    handleBigSaleUrlParam();
  });
  // Listen for CMS saves so the panel stays in sync.
  try {
    window.addEventListener('vai-promo-changed', function () { loadBigSaleProducts(true).then(function () { injectBigSaleAdminActions(); }); });
  } catch (e) {}
}

// Handle dynamic DOM changes
function tryInitBigSale(retries = 20) {
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', () => initBigSale());
  } else {
    initBigSale();
  }
}

tryInitBigSale();