import process from 'node:process';
import { PrismaClient } from '@prisma/client';

const prisma = new PrismaClient();

function stripHtml(html: string): string {
  return html.replace(/<[^>]+>/g, ' ').replace(/\s+/g, ' ').trim();
}

async function runSeoBackfill() {
  console.log('🚀 Starting SEO & Content Backfill Script for Canina Iran...\n');

  // 1. Backfill Products
  const products = await prisma.product.findMany();
  console.log(`📦 Found ${products.length} products to check...`);

  let updatedProducts = 0;

  for (const product of products) {
    const dataToUpdate: Record<string, any> = {};

    if (!product.metaTitle || product.metaTitle.trim() === '') {
      dataToUpdate.metaTitle = `${product.nameFa} (${product.packageSize} ${product.unit}) | کنینا ایران`;
    }

    if (!product.metaDescription || product.metaDescription.trim() === '') {
      const baseDesc = product.shortDescription || stripHtml(product.description || '');
      const cleanDesc = baseDesc.substring(0, 150).trim();
      dataToUpdate.metaDescription = cleanDesc
        ? `${cleanDesc} | خرید اینترنتی با ضمانت اصالت کنینا آلمان.`
        : `خرید آنلاین ${product.nameFa} با ضمانت ۱۰۰٪ اصالت آلمان و ارسال سریع در کنینا ایران.`;
    }

    if (!product.featuredImageAlt || product.featuredImageAlt.trim() === '') {
      dataToUpdate.featuredImageAlt = `مکمل دارویی ${product.nameFa} Canina آلمان`;
    }

    if (!product.keywords || product.keywords.trim() === '') {
      const tags = [
        product.nameFa,
        product.nameEn,
        `مکمل ${product.suitableFor}`,
        'کنینا آلمان',
        'Canina',
        product.categorySlug,
      ].filter(Boolean);
      dataToUpdate.keywords = tags.join(', ');
    }

    if (Object.keys(dataToUpdate).length > 0) {
      await prisma.product.update({
        where: { id: product.id },
        data: dataToUpdate,
      });
      updatedProducts++;
    }
  }

  console.log(`✅ Products backfill complete: ${updatedProducts} products updated.\n`);

  // 2. Backfill Blogs & Cross-Linking
  const blogs = await prisma.blog.findMany();
  console.log(`📰 Found ${blogs.length} blog posts to check...`);

  let updatedBlogs = 0;

  for (const blog of blogs) {
    const dataToUpdate: Record<string, any> = {};

    if (!blog.metaTitle || blog.metaTitle.trim() === '') {
      dataToUpdate.metaTitle = `${blog.title} | مجله تخصصی کنینا`;
    }

    if (!blog.metaDescription || blog.metaDescription.trim() === '') {
      const baseExcerpt = blog.excerpt || stripHtml(blog.content || '');
      dataToUpdate.metaDescription = baseExcerpt.substring(0, 155).trim();
    }

    if (!blog.imageAlt || blog.imageAlt.trim() === '') {
      dataToUpdate.imageAlt = `تصویر راهنمای تخصصی ${blog.title}`;
    }

    // Auto Cross-Linking: If relatedProductIds is empty, match top products by category or title keywords
    if (!blog.relatedProductIds || blog.relatedProductIds.length === 0) {
      const keywords = [blog.title, blog.keywords].filter(Boolean).join(' ');
      const matchingProducts = await prisma.product.findMany({
        where: {
          OR: [
            { categorySlug: { contains: blog.categoryId || '', mode: 'insensitive' } },
            { nameFa: { contains: blog.title.split(' ')[0] || '', mode: 'insensitive' } },
            { description: { contains: blog.title.split(' ')[0] || '', mode: 'insensitive' } },
          ],
        },
        take: 3,
        select: { id: true },
      });

      if (matchingProducts.length > 0) {
        dataToUpdate.relatedProductIds = matchingProducts.map((p) => p.id);
      } else {
        // Fallback: pick top 2 featured products
        const topProducts = await prisma.product.findMany({ take: 2, select: { id: true } });
        dataToUpdate.relatedProductIds = topProducts.map((p) => p.id);
      }
    }

    if (Object.keys(dataToUpdate).length > 0) {
      await prisma.blog.update({
        where: { id: blog.id },
        data: dataToUpdate,
      });
      updatedBlogs++;
    }
  }

  console.log(`✅ Blog posts backfill complete: ${updatedBlogs} posts updated with SEO & cross-links.\n`);

  console.log('🎉 SEO Backfill and Internal Cross-Linking finished successfully!');
}

runSeoBackfill()
  .catch((e) => {
    console.error('❌ SEO Backfill failed:', e);
    process.exit(1);
  })
  .finally(async () => {
    await prisma.$disconnect();
  });