import { fetchLiveCampaignProducts } from "./api";

export type StyleConfig = Partial<{
  primary: string;
  primaryDark: string;
  accent: string;
  text: string;
  textLight: string;
  bgLight: string;
  white: string;
  shadow: string;
  borderRadius: string;
}>;

export async function fetchLiveCampaignProductsWithHtml(
  productCount: number = 10,
  style: StyleConfig = {}
): Promise<string> {
  // Try to use transactions in browser environments only
  const withTransaction = typeof window !== 'undefined';
  const result = await fetchLiveCampaignProducts(withTransaction);
  
  // Handle both response formats (with or without transaction)
  const campaign = result?.campaign || result;
  const transaction = result?.transaction;
  const userId = result?.user_id;
  const noCampaignContentFound = `<div style="text-align: center; padding: 40px;">
  <img src="https://cdn-icons-png.flaticon.com/512/4076/4076549.png" alt="No Campaign" width="120" style="opacity: 0.6;" />
  <h2 style="color: #555; margin-top: 20px;">No Active Campaign Found</h2>
  <p style="color: #888;">Please check back later or contact your administrator.</p>
</div>
`;

  if(!campaign || campaign.message) {
    return noCampaignContentFound;
  }

  const defaultStyle: Required<StyleConfig> = {
    primary: "#3d5af1",
    primaryDark: "#2a3eb1",
    accent: "#ff6b6b",
    text: "#333333",
    textLight: "#777777",
    bgLight: "#f8f9fa",
    white: "#ffffff",
    shadow: "0 10px 30px rgba(0,0,0,0.08)",
    borderRadius: "12px",
  };

  const mergedStyle = { ...defaultStyle, ...style };

  const liveProductCount = campaign?.products?.length || 0;

  if (!liveProductCount || !campaign) {
    return noCampaignContentFound;
  }

  const productCards = campaign.products
    .slice(0, productCount)
    .map((product: any, index: number) => {
      // --- Data Normalization & Backward Compatibility ---
      // Ensure product has an ID
      if (!product.productId && product.id) {
        product.productId = product.id.toString();
      }
      
      // Ensure product has a name
      if (!product.productName && product.name) {
        product.productName = product.name;
      }
      
      // Make sure we have the image URL
      if (product.imgUrl && product.imgUrl.startsWith('/')) {
        product.imgUrl = `https://cdnaz.plotch.io/image/upload/w_300,h_450${product.imgUrl}?product_id=${product.productId}&s=1&tf=vt`;
      }
      
      // For backward compatibility with older schema
      if (product.base_image && product.base_image.original_image_url && !product.imgUrl) {
        product.imgUrl = product.base_image.original_image_url;
      }
      
      // Normalize prices for consistency
      if (typeof product.regularPrice === 'undefined' && product.prices?.regular?.price) {
        product.regularPrice = parseFloat(product.prices.regular.price);
      }
      
      if (typeof product.discountedPrice === 'undefined' && product.prices?.final?.price) {
        product.discountedPrice = parseFloat(product.prices.final.price);
      }
      
      // Calculate discount percentage if not provided
      if (typeof product.discountPercentage === 'undefined' && 
          product.regularPrice && product.discountedPrice && 
          product.regularPrice > product.discountedPrice) {
        const discount = product.regularPrice - product.discountedPrice;
        product.discountPercentage = Math.round((discount / product.regularPrice) * 100);
      }
      
      // Normalize ratings
      if (typeof product.productRatings === 'undefined' && product.ratings?.average) {
        product.productRatings = parseFloat(product.ratings.average);
      }
      
      // Build product URL through redirect API
      const productName = product.productName
      .toLowerCase()
      .replace(/[^a-z0-9\s-]/g, '') // Remove special chars except hyphen
      .replace(/\s+/g, '-') // Replace spaces with single hyphen
      .replace(/-+/g, '-') // Replace multiple hyphens with single hyphen
      .replace(/(\d+)\s*(kg|g|ml|l)\b/i, '$1$2'); // Join number and unit without space
      const productUrl = `https://shop.samhita.org/product/${productName}/${product.productId}?affiliate_id=${transaction?.data?.affiliate_id}&user_id=${userId}`;
      
      // Calculate discount percentage or use provided value
      const discountPercent = product.discountPercentage || 
        (product.regularPrice && product.discountedPrice ? 
          Math.round((1 - product.discountedPrice / product.regularPrice) * 100) : 0);
      
      // Format prices with currency
      const formattedRegularPrice = `₹${product.regularPrice?.toLocaleString('en-IN') || ''}`;
      const formattedDiscountedPrice = `₹${product.discountedPrice?.toLocaleString('en-IN') || ''}`;
      
      // Get primary image
      const productImage = product.imgUrl || 
        (product.galleryImages && product.galleryImages.length > 0 ? 
          product.galleryImages[0].url : '');
      
      // Prepare rating stars
      const rating = product.productRatings || 0;
      const ratingStars = Array(5).fill('')
        .map((_, i) => i < rating ? '★' : '☆')
        .join('');
      
      // Get brand and vendor information
      const brandName = product.brandName || '';
      const vendorName = product.vendorName || '';
      
      // Get delivery, category and other details
      const estimatedDelivery = product.estimatedDeliveryTime || '';
      const categoryDisplay = product.categoryName && product.categoryName.length > 0 ? 
        product.categoryName.join(', ') : '';
      const unitDisplay = product.unit ? `Per ${product.unit}` : '';
      
      // Shipping and returns info
      const returnable = product.returnable === 'Yes' ? 'Returnable' : (product.returnable === 'No' ? 'Non-returnable' : '');
      const cancelable = product.cancellable === 'Yes' ? 'Can be canceled' : '';

      // Animation delay for staggered entrance
      const animationDelay = (index * 0.1).toFixed(1);

      return `
        <div class="product-card" style="animation-delay: ${animationDelay}s;">
          ${discountPercent > 0 ? 
            `<div class="discount-tag">
              <span class="discount-value">-${discountPercent}%</span>
             </div>` : ''}
          
          <div class="card-top">
            <div class="product-image-container">
              <img src="${productImage}" alt="${product.productName || ''}" loading="lazy" onerror="this.onerror=null;this.src='https://www.howmet.com/wp-content/themes/howmet/assets/build/images/placeholder-image.db2b4d5c.jpeg';" />
              ${brandName ? `<div class="brand-flag">${brandName}</div>` : ''}
            </div>
          </div>
          
          <div class="card-content">
            <h3 class="product-title">${product.productName || ''}</h3>
            
            <div class="info-section">
              ${categoryDisplay ? `<div class="product-category">${categoryDisplay}</div>` : ''}
              
              ${rating > 0 ? 
                `<div class="rating-row">
                  <div class="stars">${ratingStars}</div>
                  <span class="rating-number">${rating.toFixed(1)}</span>
                </div>` : ''}
            </div>
            
            <div class="price-row">
              ${product.discountedPrice && product.regularPrice ? 
                `<div class="price-current">${formattedDiscountedPrice}</div>
                 <div class="price-original">${formattedRegularPrice}</div>` : 
                `<div class="price-current price-only">${formattedRegularPrice}</div>`
              }
              ${unitDisplay ? `<div class="unit-display">${unitDisplay}</div>` : ''}
            </div>
            
            ${vendorName ? `<div class="vendor-badge">Sold by ${vendorName}</div>` : ''}
            
            ${estimatedDelivery ? 
              `<div class="delivery-info">
                <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></svg>
                <span>${estimatedDelivery}</span>
              </div>` : ''}
            
            ${returnable || cancelable ? 
              `<div class="shipping-info">
                ${returnable ? `<span class="shipping-tag">${returnable}</span>` : ''}
                ${cancelable ? `<span class="shipping-tag">${cancelable}</span>` : ''}
              </div>` : ''}
            
            <div class="cta-container">
              <a href="${productUrl}" 
                 class="view-btn" 
                 target="_blank" 
                 aria-label="View ${product.productName || 'product'}"
                 onclick="
                   (function(event) {
                     event.preventDefault();
                     
                     // Define all variables needed inline
                     var campaignId = '${campaign._id}';
                     var productId = '${product.productId}';
                     var affiliateId = '${transaction?.data?.affiliate_id || ''}';
                     var targetUrl = '${productUrl}';
                     var userId = '${userId || ''}';
                     // Create the API request
                     fetch('https://ondc-sdk.samhita.org/api/transactions/update', {
                       method: 'POST',
                       headers: { 'Content-Type': 'application/json' },
                       body: JSON.stringify({
                         campaign_id: campaignId,
                         product_id: productId,
                         affiliate_id: affiliateId || undefined,
                         status: 'initiated',
                         user_id: userId
                       })
                     })
                     .then(function(response) {
                       if (response.ok) {
                         window.open(targetUrl, '_blank');
                       } else {
                         console.error('Failed to update transaction');
                       }
                     })
                     .catch(function(err) {
                       console.error('Error updating transaction:', err);
                     });
                     
                     return false;
                   })(event);
                 "
              >
                <span>View Details</span>
                <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
                  <path d="M5 12h14"></path>
                  <path d="M12 5l7 7-7 7"></path>
                </svg>
              </a>
            </div>
          </div>
        </div>
      `;
    })
    .join("");

  const campaignContent = `
    <style>
      :root {
        --primary: ${mergedStyle.primary};
        --primary-dark: ${mergedStyle.primaryDark};
        --accent: ${mergedStyle.accent};
        --text: ${mergedStyle.text};
        --text-light: ${mergedStyle.textLight};
        --bg-light: ${mergedStyle.bgLight};
        --white: ${mergedStyle.white};
        --shadow: ${mergedStyle.shadow};
        --border-radius: ${mergedStyle.borderRadius};
        --card-radius: 16px;
        --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
      }

      /* Base styles */
      .ondc-campaign {
        font-family: 'Inter', system-ui, -apple-system, sans-serif;
        width: 100%;
        max-width: 1400px;
        margin: 0 auto;
        padding: 2rem;
        background: var(--bg-light);
        border-radius: 24px;
        overflow: hidden;
        box-sizing: border-box;
      }
      
      .ondc-campaign *, .ondc-campaign *:before, .ondc-campaign *:after {
        box-sizing: border-box;
      }

      /* Campaign header */
      .campaign-banner {
        width: 100%;
        border-radius: 18px;
        overflow: hidden;
        margin-bottom: 2rem;
        box-shadow: 0 15px 30px rgba(0,0,0,0.06);
        position: relative;
      }
      
      .campaign-banner img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
        max-height: fit-content;
      }
      
      .campaign-header-content {
        margin-bottom: 3rem;
        text-align: center;
        position: relative;
        padding: 0 1rem;
      }
      
      .title-accent {
        display: inline-block;
        font-size: 0.9rem;
        font-weight: 600;
        text-transform: uppercase;
        letter-spacing: 0.08em;
        color: var(--primary);
        background-color: rgba(61, 90, 241, 0.08);
        padding: 6px 16px;
        border-radius: 100px;
        margin-bottom: 1rem;
      }
      
      .campaign-header-content::after {
        content: '';
        position: absolute;
        bottom: -1.5rem;
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 3px;
        background: var(--primary);
        border-radius: 3px;
      }
      
      .campaign-title {
        font-size: 2.8rem;
        font-weight: 800;
        color: var(--text);
        margin: 0 0 1.2rem;
        line-height: 1.2;
        letter-spacing: -0.02em;
        background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        text-fill-color: transparent;
      }
      
      .campaign-description {
        font-size: 1.2rem;
        color: var(--text-light);
        line-height: 1.8;
        margin: 0 auto;
        max-width: 800px;
        font-weight: 400;
      }

      /* Products grid */
      .products-section {
        padding: 0;
      }

      .products-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 2rem;
        position: relative;
      }

      /* Product card */
      .product-card {
        background: var(--white);
        border-radius: var(--card-radius);
        overflow: hidden;
        position: relative;
        transition: transform 0.4s var(--ease-out-expo), box-shadow 0.4s var(--ease-out-expo);
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
        height: 100%;
        display: flex;
        flex-direction: column;
        transform: translateY(20px);
        opacity: 0;
        animation: fadeInUp 0.7s var(--ease-out-expo) forwards;
      }
      
      @keyframes fadeInUp {
        from {
          opacity: 0;
          transform: translateY(20px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }
      
      .product-card:hover {
        transform: translateY(-10px);
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08), 0 10px 20px rgba(0, 0, 0, 0.05);
      }
      
      .product-card:hover .product-image-container img {
        transform: scale(1.08);
      }
      
      .discount-tag {
        position: absolute;
        top: 16px;
        right: 16px;
        z-index: 5;
        background: var(--accent);
        color: white;
        border-radius: 100px;
        height: 44px;
        width: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 700;
        font-size: 0.75rem;
        box-shadow: 0 4px 10px rgba(255, 107, 107, 0.3);
      }
      
      .discount-value {
        line-height: 1;
        display: block;
      }

      .card-top {
        position: relative;
        overflow: hidden;
        border-radius: var(--card-radius) var(--card-radius) 0 0;
        height: 240px;
      }
      
      .product-image-container {
        width: 100%;
        height: 100%;
        background: #f5f5f5;
        position: relative;
        overflow: hidden;
      }
      
      .product-image-container img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.5s var(--ease-out-expo);
      }
      
      .brand-flag {
        position: absolute;
        bottom: 0;
        left: 0;
        background: rgba(0,0,0,0.7);
        color: white;
        padding: 6px 12px;
        font-size: 0.75rem;
        font-weight: 600;
        border-top-right-radius: 8px;
        text-transform: uppercase;
        letter-spacing: 0.5px;
      }
      
      .card-content {
        padding: 1.5rem;
        display: flex;
        flex-direction: column;
        flex-grow: 1;
        position: relative;
      }
      
      .product-title {
        font-size: 1.15rem;
        font-weight: 600;
        line-height: 1.4;
        color: var(--text);
        margin: 0 0 12px;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
      }
      
      .info-section {
        display: flex;
        align-items: center;
        justify-content: space-between;
        margin-bottom: 1rem;
      }
      
      .product-category {
        font-size: 0.8rem;
        color: var(--text-light);
        background: rgba(0,0,0,0.05);
        padding: 4px 10px;
        border-radius: 100px;
        display: inline-block;
      }
      
      .price-row {
        display: flex;
        align-items: baseline;
        flex-wrap: wrap;
        gap: 8px;
        margin-bottom: 14px;
        position: relative;
      }
      
      .price-current {
        font-size: 1.5rem;
        font-weight: 700;
        color: var(--primary);
      }
      
      .price-original {
        font-size: 0.9rem;
        text-decoration: line-through;
        color: var(--text-light);
        font-weight: 400;
      }
      
      .price-only {
        color: #2e2e2e;
      }
      
      .unit-display {
        position: absolute;
        right: 0;
        bottom: -12px;
        font-size: 0.75rem;
        color: var(--text-light);
      }
      
      .rating-row {
        display: flex;
        align-items: center;
        gap: 6px;
      }
      
      .stars {
        color: #FFB800;
        font-size: 0.9rem;
        letter-spacing: 1px;
      }
      
      .rating-number {
        color: var(--text-light);
        font-size: 0.8rem;
        font-weight: 500;
      }
      
      .vendor-badge {
        display: inline-block;
        font-size: 0.85rem;
        color: var(--text);
        margin-bottom: 1rem;
        font-weight: 500;
      }
      
      .delivery-info {
        display: flex;
        align-items: center;
        gap: 6px;
        color: var(--text-light);
        font-size: 0.85rem;
        margin-bottom: 10px;
      }
      
      .delivery-info svg {
        color: var(--primary);
      }
      
      .shipping-info {
        display: flex;
        gap: 10px;
        margin-bottom: 1.2rem;
        flex-wrap: wrap;
      }
      
      .shipping-tag {
        display: inline-block;
        font-size: 0.75rem;
        color: var(--text-light);
        background: rgba(0,0,0,0.05);
        padding: 3px 8px;
        border-radius: 4px;
      }
      
      .cta-container {
        margin-top: auto;
      }
      
      .view-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        background-color: var(--primary);
        color: white;
        border: none;
        padding: 12px 24px;
        border-radius: 8px;
        font-weight: 600;
        font-size: 0.95rem;
        text-decoration: none;
        width: 100%;
        transition: all 0.3s ease;
        box-shadow: 0 5px 15px rgba(61, 90, 241, 0.2);
      }
      
      .view-btn svg {
        transition: transform 0.3s ease;
      }
      
      .view-btn:hover {
        background-color: var(--primary-dark);
        box-shadow: 0 8px 20px rgba(61, 90, 241, 0.3);
      }
      
      .view-btn:hover svg {
        transform: translateX(3px);
      }

      /* Responsive styles */
      @media (max-width: 1200px) {
        .campaign-title {
          font-size: 2.5rem;
        }
        
        .campaign-banner {
          height: 240px;
        }
      }
      
      @media (max-width: 992px) {
        .products-grid {
          grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
          gap: 1.5rem;
        }
        
        .campaign-title {
          font-size: 2.2rem;
        }
        
        .campaign-description {
          font-size: 1.1rem;
          line-height: 1.7;
        }
        
        .campaign-header-content::after {
          width: 70px;
          height: 3px;
          bottom: -1.2rem;
        }
      }
      
      @media (max-width: 768px) {
        .ondc-campaign {
          padding: 1.5rem;
        }
        
        .campaign-banner {
          height: 200px;
          margin-bottom: 1.5rem;
        }
        
        .title-accent {
          font-size: 0.8rem;
          padding: 5px 14px;
          margin-bottom: 0.8rem;
        }
        
        .campaign-title {
          font-size: 2rem;
        }
        
        .campaign-description {
          font-size: 1rem;
          line-height: 1.6;
        }
        
        .campaign-header-content {
          margin-bottom: 2.5rem;
        }
        
        .campaign-header-content::after {
          width: 60px;
          height: 2.5px;
          bottom: -1rem;
        }
        
        .card-top {
          height: 200px;
        }
      }
      
      @media (max-width: 576px) {
        .ondc-campaign {
          padding: 1rem;
        }
        
        .campaign-banner {
          height: 160px;
        }
        
        .campaign-title {
          font-size: 1.5rem;
        }
        
        .products-grid {
          grid-template-columns: 1fr;
          gap: 1.2rem;
        }
        
        .product-title {
          font-size: 1.1rem;
        }
        
        .price-current {
          font-size: 1.3rem;
        }
        
        .view-btn {
          padding: 10px 20px;
          font-size: 0.9rem;
        }
      }
    </style>

    <div class="ondc-campaign">
      <div class="campaign-banner">
        <img src="${campaign.banner}" alt="${campaign.campaignName || ''}" onerror="this.onerror=null;this.src='https://via.placeholder.com/1200x400?text=Campaign';" />
      </div>
      
      <div class="campaign-header-content">
        ${campaign.campaignName ? '<span class="title-accent">Featured Campaign</span>' : ''}
        <h1 class="campaign-title">${campaign.campaignName || 'Featured Products'}</h1>
        <p class="campaign-description">${campaign.description || 'Browse our collection of curated products'}</p>
      </div>
      
      <div class="products-section">
        <div class="products-grid">
          ${productCards}
        </div>
      </div>
    </div>
  `;

  return liveProductCount ? campaignContent : noCampaignContentFound;
}

export async function renderLiveCampaignProducts(
  productCount: number = 10,
  style: StyleConfig = {}
): Promise<void> {
  const html = await fetchLiveCampaignProductsWithHtml(productCount, style);
  document.body.innerHTML = html;
}