import { firefox } from 'playwright';
import { pool } from './src/db/migrate.js';
import { getRandomProxy } from './src/utils/proxyManager.js';

// Get command line arguments
const dispensaryId = parseInt(process.argv[2] || '112', 10);
const startBrandIndex = parseInt(process.argv[3] || '0', 10);
const endBrandIndex = parseInt(process.argv[4] || '89', 10);
const workerNum = process.argv[5] || '1';

interface Product {
  slug: string;
  name: string;
  brand?: string;
  variant?: string;
  description?: string;
  regularPrice?: number;
  salePrice?: number;
  thcPercentage?: number;
  cbdPercentage?: number;
  strainType?: string;
  terpenes: string[];
  effects: string[];
  flavors: string[];
  imageUrl?: string;
  dutchieUrl: string;
  inStock: boolean;
  stockQuantity?: number;
  stockStatus?: string;
}

interface Brand {
  slug: string;
  name: string;
  url: string;
}

async function scrapeBrandsList(menuUrl: string, context: any, page: any): Promise<Brand[]> {
  try {
    const brandsUrl = `${menuUrl}/brands`;
    console.log(`[W${workerNum}] 📄 Loading brands page: ${brandsUrl}`);

    await page.goto(brandsUrl, {
      waitUntil: 'domcontentloaded',
      timeout: 60000
    });

    console.log(`[W${workerNum}] ⏳ Waiting for brands to render...`);
    await page.waitForSelector('a[href*="/brands/"]', { timeout: 45000 });
    console.log(`[W${workerNum}] ✅ Brands appeared!`);
    await page.waitForTimeout(3000);

    // Scroll to load all brands
    console.log(`[W${workerNum}] 📜 Scrolling to load all brands...`);
    let previousHeight = 0;
    let scrollAttempts = 0;
    const maxScrolls = 10;

    while (scrollAttempts < maxScrolls) {
      await page.evaluate(() => window.scrollTo(0, document.body.scrollHeight));
      await page.waitForTimeout(1500);

      const currentHeight = await page.evaluate(() => document.body.scrollHeight);
      if (currentHeight === previousHeight) break;

      previousHeight = currentHeight;
      scrollAttempts++;
    }

    // Extract all brand links
    const brands = await page.evaluate(() => {
      const brandLinks = Array.from(document.querySelectorAll('a[href*="/brands/"]'));

      const extracted = brandLinks.map(link => {
        const href = link.getAttribute('href') || '';
        const slug = href.split('/brands/')[1]?.replace(/\/$/, '') || '';
        const name = link.textContent?.trim() || slug;

        return {
          slug,
          name,
          url: href.startsWith('http') ? href : href
        };
      });

      // Filter out duplicates and invalid entries
      const seen = new Set();
      const unique = extracted.filter(b => {
        if (!b.slug || !b.name || seen.has(b.slug)) return false;
        seen.add(b.slug);
        return true;
      });

      return unique;
    });

    console.log(`[W${workerNum}] ✅ Found ${brands.length} total brands`);
    return brands;

  } catch (error: any) {
    console.error(`[W${workerNum}] ❌ Error scraping brands list:`, error.message);
    return [];
  }
}

async function scrapeProductsFromBrand(
  menuUrl: string,
  brand: Brand,
  dispensaryId: number,
  page: any
): Promise<Product[]> {
  try {
    const brandUrl = `${menuUrl}/brands/${brand.slug}`;
    console.log(`[W${workerNum}] 📄 Loading brand page: ${brandUrl}`);

    await page.goto(brandUrl, {
      waitUntil: 'domcontentloaded',
      timeout: 60000
    });

    await page.waitForTimeout(3000);

    // Scroll to load all products
    for (let i = 0; i < 20; i++) {
      await page.evaluate(() => window.scrollBy(0, window.innerHeight));
      await page.waitForTimeout(1500);
    }

    // Extract products
    const products = await page.evaluate((brandName: string) => {
      const productCards = Array.from(document.querySelectorAll('a[href*="/product/"]'));

      return productCards.map(card => {
        const href = card.getAttribute('href') || '';
        const slug = href.split('/product/')[1]?.replace(/\/$/, '') || '';
        const allText = card.textContent || '';
        const allTextLower = allText.toLowerCase();
        const inStock = !allTextLower.includes('out of stock');

        // Extract stock quantity (e.g., "5 left in stock", "Only 3 left")
        let stockQuantity = undefined;
        const quantityMatch = allText.match(/(\d+)\s+left/i);
        if (quantityMatch) {
          stockQuantity = parseInt(quantityMatch[1]);
        }

        // Extract stock status messages
        let stockStatus = undefined;
        if (allTextLower.includes('out of stock')) {
          stockStatus = 'out of stock';
        } else if (allTextLower.includes('low stock') || allTextLower.includes('limited')) {
          stockStatus = 'low stock';
        } else if (quantityMatch) {
          stockStatus = `${stockQuantity} left in stock`;
        } else if (allTextLower.includes('order soon')) {
          stockStatus = 'order soon';
        }

        return {
          slug,
          name: card.textContent?.trim().substring(0, 200) || '',
          brand: brandName,
          dutchieUrl: href,
          inStock,
          stockQuantity,
          stockStatus,
          terpenes: [],
          effects: [],
          flavors: []
        };
      });
    }, brand.name);

    console.log(`[W${workerNum}] ✅ Extracted ${products.length} products from brand: ${brand.name}`);
    return products;

  } catch (error: any) {
    console.error(`[W${workerNum}] ❌ Error scraping brand ${brand.name}:`, error.message);
    return [];
  }
}

async function saveProduct(product: Product, dispensaryId: number): Promise<boolean> {
  const client = await pool.connect();

  try {
    await client.query('BEGIN');

    // Check if product exists
    const existing = await client.query(
      'SELECT id FROM products WHERE dispensary_id = $1 AND slug = $2',
      [dispensaryId, product.slug]
    );

    let productId: number;

    if (existing.rows.length > 0) {
      // UPDATE existing product
      productId = existing.rows[0].id;

      await client.query(`
        UPDATE products
        SET name = $1, brand = $2, variant = $3, description = $4,
            regular_price = $5, sale_price = $6,
            thc_percentage = $7, cbd_percentage = $8, strain_type = $9,
            terpenes = $10, effects = $11, flavors = $12,
            image_url = $13, dutchie_url = $14, in_stock = $15,
            stock_quantity = $16, stock_status = $17,
            last_seen_at = CURRENT_TIMESTAMP, updated_at = CURRENT_TIMESTAMP
        WHERE id = $18
      `, [
        product.name, product.brand, product.variant, product.description,
        product.regularPrice, product.salePrice,
        product.thcPercentage, product.cbdPercentage, product.strainType,
        product.terpenes, product.effects, product.flavors,
        product.imageUrl, product.dutchieUrl, product.inStock,
        product.stockQuantity, product.stockStatus,
        productId
      ]);
    } else {
      // INSERT new product
      const result = await client.query(`
        INSERT INTO products (
          dispensary_id, slug, name, brand, variant, description,
          regular_price, sale_price,
          thc_percentage, cbd_percentage, strain_type,
          terpenes, effects, flavors,
          image_url, dutchie_url, in_stock, stock_quantity, stock_status
        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19)
        RETURNING id
      `, [
        dispensaryId, product.slug, product.name, product.brand, product.variant, product.description,
        product.regularPrice, product.salePrice,
        product.thcPercentage, product.cbdPercentage, product.strainType,
        product.terpenes, product.effects, product.flavors,
        product.imageUrl, product.dutchieUrl, product.inStock, product.stockQuantity, product.stockStatus
      ]);

      productId = result.rows[0].id;
    }

    await client.query('COMMIT');
    return true;
  } catch (error: any) {
    await client.query('ROLLBACK');
    console.error(`[W${workerNum}] ❌ Error saving product:`, error.message);
    return false;
  } finally {
    client.release();
  }
}

async function main() {
  console.log(`\n${'='.repeat(60)}`);
  console.log(`🚀 PARALLEL SCRAPER - WORKER ${workerNum}`);
  console.log(`   Dispensary ID: ${dispensaryId}`);
  console.log(`   Brand Range: ${startBrandIndex} - ${endBrandIndex}`);
  console.log(`${'='.repeat(60)}\n`);

  // Get dispensary info
  const dispensaryResult = await pool.query(
    "SELECT id, name, menu_url FROM dispensaries WHERE id = $1",
    [dispensaryId]
  );

  if (dispensaryResult.rows.length === 0) {
    console.error(`[W${workerNum}] ❌ Dispensary ID ${dispensaryId} not found`);
    process.exit(1);
  }

  const menuUrl = dispensaryResult.rows[0].menu_url;
  console.log(`[W${workerNum}] ✅ Dispensary: ${dispensaryResult.rows[0].name}`);

  // Get proxy
  const proxy = await getRandomProxy();
  if (!proxy) {
    console.log(`[W${workerNum}] ❌ No proxy available`);
    process.exit(1);
  }

  console.log(`[W${workerNum}] 🔐 Using proxy: ${proxy.server}`);

  // Launch browser
  const browser = await firefox.launch({ headless: true });

  const context = await browser.newContext({
    viewport: { width: 1920, height: 1080 },
    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36',
    proxy: {
      server: proxy.server,
      username: proxy.username,
      password: proxy.password
    }
  });

  const page = await context.newPage();

  // Get all brands
  const allBrands = await scrapeBrandsList(menuUrl, context, page);

  if (allBrands.length === 0) {
    console.log(`[W${workerNum}] ❌ No brands found`);
    await browser.close();
    process.exit(1);
  }

  // Filter to assigned range
  const brandsToScrape = allBrands.slice(startBrandIndex, endBrandIndex + 1);
  console.log(`[W${workerNum}] 📋 Processing ${brandsToScrape.length} brands (${startBrandIndex}-${endBrandIndex})`);

  let totalProducts = 0;
  let totalSaved = 0;

  // Scrape each brand
  for (let i = 0; i < brandsToScrape.length; i++) {
    const brand = brandsToScrape[i];
    const globalIndex = startBrandIndex + i;

    console.log(`\n[W${workerNum}] ${'='.repeat(60)}`);
    console.log(`[W${workerNum}] 🏷️  BRAND ${i + 1}/${brandsToScrape.length} (Global: ${globalIndex + 1}/90): ${brand.name}`);
    console.log(`[W${workerNum}] ${'='.repeat(60)}\n`);

    const products = await scrapeProductsFromBrand(menuUrl, brand, dispensaryId, page);
    totalProducts += products.length;

    // Save products
    for (const product of products) {
      const saved = await saveProduct(product, dispensaryId);
      if (saved) totalSaved++;
    }

    console.log(`[W${workerNum}] ✅ Brand "${brand.name}" complete: ${products.length} products saved`);
    await page.waitForTimeout(2000);
  }

  console.log(`\n[W${workerNum}] ${'='.repeat(60)}`);
  console.log(`[W${workerNum}] ✅ WORKER ${workerNum} COMPLETE`);
  console.log(`[W${workerNum}]    Brands scraped: ${brandsToScrape.length}`);
  console.log(`[W${workerNum}]    Total products: ${totalProducts}`);
  console.log(`[W${workerNum}]    Products saved: ${totalSaved}`);
  console.log(`[W${workerNum}] ${'='.repeat(60)}\n`);

  await browser.close();
  await pool.end();
}

main().catch(console.error);