/**
 * Switch Assets Scraper — Playwright-based for JS-heavy vendor sites
 *
 * Cisco, Arista, HPE/Aruba, Dell, and Extreme require JavaScript rendering
 * to access product pages, datasheets, and images.
 *
 * Uses PlaywrightCrawler for full browser rendering.
 */
import { PlaywrightCrawler } from "crawlee";
import { pool } from "../utils/db";
import { makeCrawleeConfig } from "../utils/crawlee-config";
import {
  downloadSwitchImage,
  downloadSwitchDatasheet,
  downloadSwitchManual,
  setSwitchProductPage,
} from "../utils/assets";

interface CrawlTarget {
  switchId: string;
  vendorId: string;
  vendorName: string;
  model: string;
  productPageUrl: string;
}

// ═══════════════════════════════════════════════════════
// Vendor-specific product page URL builders
// ═══════════════════════════════════════════════════════

function buildCiscoUrl(model: string): string {
  if (model.startsWith("N9K-") || model.startsWith("N3K-")) {
    // Nexus 9000 — use datasheet listing page for JS-rendered content
    return `https://www.cisco.com/c/en/us/products/switches/nexus-9000-series-switches/datasheet-listing.html`;
  }
  if (model.startsWith("C93")) {
    return `https://www.cisco.com/c/en/us/products/switches/catalyst-9300-series-switches/datasheet-listing.html`;
  }
  if (model.startsWith("C92")) {
    return `https://www.cisco.com/c/en/us/products/switches/catalyst-9200-series-switches/index.html`;
  }
  if (model.startsWith("C95")) {
    return `https://www.cisco.com/c/en/us/products/switches/catalyst-9500-series-switches/index.html`;
  }
  if (model.startsWith("C9")) {
    return `https://www.cisco.com/c/en/us/products/switches/catalyst-9000/index.html`;
  }
  if (model.startsWith("NCS-") || model.startsWith("81")) {
    return `https://www.cisco.com/c/en/us/products/routers/network-convergence-system-5500-series/index.html`;
  }
  return `https://www.cisco.com/site/us/en/products/networking/cloud-networking-switches/index.html`;
}

function buildAristaUrl(model: string): string {
  // Arista product pages: /en/products/{series}-series (no hyphens in series name)
  const series = model.match(/^(\d{4}[A-Z]*\d*)/)?.[1] || model;
  return `https://www.arista.com/en/products/${series.toLowerCase().replace(/[^a-z0-9]/g, "")}-series`;
}

function buildHpeUrl(model: string): string {
  const seriesNum = model.match(/CX\s*(\d+)/)?.[1] || "";
  return `https://www.arubanetworks.com/products/switches/cx-${seriesNum}-series/`;
}

function buildDellUrl(model: string): string {
  return `https://www.dell.com/en-us/shop/networking-switches/${model.toLowerCase().replace(/\s+/g, "-")}/spd/${model.toLowerCase().replace(/\s+/g, "-")}`;
}

function buildExtremeUrl(model: string): string {
  return `https://www.extremenetworks.com/product/${model.toLowerCase().replace(/[^a-z0-9]/g, "-")}`;
}

function buildJsVendorUrl(vendorName: string, model: string): string | null {
  const lower = vendorName.toLowerCase();
  if (lower.includes("cisco")) return buildCiscoUrl(model);
  if (lower.includes("arista")) return buildAristaUrl(model);
  if (lower.includes("hpe") || lower.includes("aruba")) return buildHpeUrl(model);
  if (lower.includes("dell")) return buildDellUrl(model);
  if (lower.includes("extreme")) return buildExtremeUrl(model);
  return null;
}

// ═══════════════════════════════════════════════════════
// Playwright-based asset extraction
// ═══════════════════════════════════════════════════════

export async function crawlSwitchAssetsPlaywright(targetVendor?: string): Promise<void> {
  console.log("=== Switch Assets Crawler (Playwright) ===\n");

  const jsVendors = ["Cisco", "Arista", "HPE", "Aruba", "Dell", "Extreme"];
  const vendorFilter = targetVendor
    ? `AND v.name ILIKE '%${targetVendor}%'`
    : `AND (${jsVendors.map((v) => `v.name ILIKE '%${v}%'`).join(" OR ")})`;

  const result = await pool.query(`
    SELECT sw.id, sw.model, sw.series, sw.product_page_url,
           v.name as vendor_name, v.id as vendor_id
    FROM switches sw
    JOIN vendors v ON sw.vendor_id = v.id
    WHERE (sw.image_url IS NULL OR sw.datasheet_url IS NULL)
      ${vendorFilter}
    ORDER BY v.name, sw.model
    LIMIT 100
  `);

  if (result.rows.length === 0) {
    console.log("No JS-vendor switches need asset scraping.\n");
    return;
  }

  const targets: CrawlTarget[] = [];
  for (const row of result.rows) {
    const productPageUrl = row.product_page_url || buildJsVendorUrl(row.vendor_name, row.model);
    if (!productPageUrl) continue;

    targets.push({
      switchId: row.id,
      vendorId: row.vendor_id,
      vendorName: row.vendor_name,
      model: row.model,
      productPageUrl,
    });
  }

  console.log(`Crawling ${targets.length} JS-heavy product pages...\n`);

  let images = 0;
  let datasheets = 0;
  let manuals = 0;

  const crawler = new PlaywrightCrawler({
    maxConcurrency: 2,
    maxRequestsPerMinute: 10,
    requestHandlerTimeoutSecs: 60,
    headless: true,
    launchContext: {
      launchOptions: {
        args: ["--no-sandbox", "--disable-setuid-sandbox"],
      },
    },

    async requestHandler({ request, page }) {
      const target = request.userData as CrawlTarget;
      console.log(`  ${target.vendorName} ${target.model}:`);

      // Wait for page to fully load
      await page.waitForLoadState("networkidle", { timeout: 15000 }).catch(() => {});

      // Set product page URL
      await setSwitchProductPage(target.switchId, request.url);

      // Extract og:image or first large product image
      const imageUrl = await page.evaluate(() => {
        const ogImage = document.querySelector('meta[property="og:image"]')?.getAttribute("content");
        if (ogImage) return ogImage;

        const imgs = Array.from(document.querySelectorAll("img"));
        const productImg = imgs.find((img) => {
          const src = img.src || "";
          const alt = (img.alt || "").toLowerCase();
          return (src.includes("product") || alt.includes("switch") || alt.includes("router"))
            && img.naturalWidth > 200;
        });
        return productImg?.src || null;
      });

      if (imageUrl) {
        const ok = await downloadSwitchImage(
          target.switchId, imageUrl, target.vendorName, target.model
        );
        if (ok) {
          images++;
          console.log(`    ✓ Image`);
        }
      }

      // Extract datasheet PDF links
      const pdfLinks = await page.evaluate(() => {
        const links = Array.from(document.querySelectorAll('a[href*=".pdf"]'));
        return links.map((a) => ({
          href: (a as HTMLAnchorElement).href,
          text: a.textContent?.trim() || "",
        }));
      });

      const datasheetLink = pdfLinks.find((l) => {
        const t = l.text.toLowerCase();
        const h = l.href.toLowerCase();
        return t.includes("datasheet") || t.includes("data sheet")
          || h.includes("datasheet") || h.includes("data-sheet");
      });

      if (datasheetLink) {
        const ok = await downloadSwitchDatasheet(
          target.switchId, target.vendorId, datasheetLink.href,
          datasheetLink.text || `${target.model} Datasheet`,
          target.vendorName, target.model
        );
        if (ok) {
          datasheets++;
          console.log(`    ✓ Datasheet`);
        }
      }

      // Extract manual/guide links
      const manualLinks = pdfLinks.filter((l) => {
        const t = l.text.toLowerCase();
        return t.includes("guide") || t.includes("manual") || t.includes("reference")
          || t.includes("quick start") || t.includes("installation");
      });

      for (const manual of manualLinks.slice(0, 3)) {
        let type = "manual";
        const t = manual.text.toLowerCase();
        if (t.includes("quick start")) type = "quick_start";
        if (t.includes("cli") || t.includes("reference")) type = "cli_reference";
        if (t.includes("installation")) type = "installation_guide";

        const ok = await downloadSwitchManual(
          target.switchId, target.vendorId, manual.href,
          manual.text, type, target.vendorName, target.model
        );
        if (ok) {
          manuals++;
          console.log(`    ✓ ${type}: ${manual.text}`);
        }
      }
    },

    async failedRequestHandler({ request }) {
      const target = request.userData as CrawlTarget;
      console.log(`  [FAIL] ${target.vendorName} ${target.model}: ${request.url}`);
    },
  }, makeCrawleeConfig("switch-assets-playwright"));

  await crawler.run(
    targets.map((t) => ({
      url: t.productPageUrl,
      userData: t,
    }))
  );

  console.log(`\n=== Playwright Crawl Complete ===`);
  console.log(`  Images: ${images}`);
  console.log(`  Datasheets: ${datasheets}`);
  console.log(`  Manuals: ${manuals}`);
}

if (require.main === module) {
  const vendor = process.argv.find((a) => a.startsWith("--vendor="))?.split("=")[1];
  crawlSwitchAssetsPlaywright(vendor)
    .then(() => pool.end())
    .catch((err) => { console.error("Fatal:", err); pool.end(); process.exit(1); });
}