/**
 * Switch Image Fetcher — og:image based image discovery for all seeded switches
 *
 * Strategy:
 *   1. For each switch without image_url, build the vendor product page URL
 *   2. Fetch page HTML (plain HTTP) and extract og:image meta tag
 *   3. Validate image URL (must be HTTP(S), not empty)
 *   4. Write image_url + product_page_url to switches table
 *
 * Vendors covered:
 *   Cisco (Nexus 9000/9300, NCS 5500/5700, Catalyst 9300/9500, 8000 SP)
 *   Arista (7000 series)
 *   Juniper (QFX, EX series)
 *   NVIDIA Networking (Spectrum SN series — ConnectX skipped)
 *   Edgecore, Celestica, Asterfusion (whitebox)
 *   Fortinet (FortiSwitch series)
 *   Dell, HPE/Aruba, Huawei, Nokia, Extreme, MikroTik, Ubiquiti, FS.COM, Supermicro
 *   Alcatel-Lucent Enterprise, Allied Telesis, Netgear, Quanta Cloud Technology, Ufispace
 *
 * Rate limit: 1 req/2sec per domain, max 3 concurrent domains.
 * Respects robots.txt: User-Agent identifies as research bot.
 */
import { pool } from "../utils/db";

const HEADERS = {
  "User-Agent": "Mozilla/5.0 (compatible; TIP-Bot/1.0; research; +https://transceiver-db.fichtmueller.org)",
  Accept: "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "Accept-Language": "en-US,en;q=0.9",
};

function sleep(ms: number): Promise<void> {
  return new Promise((r) => setTimeout(r, ms));
}

// ── Product page URL builders ───────────────────────────────────────────────

function buildCiscoUrl(model: string): string | null {
  const m = model.toUpperCase();

  // Nexus 9300/9500 series: N9K-C9364C, N9K-C93600CD-GX, N9K-C9508 …
  if (m.startsWith("N9K-C")) {
    const slug = m.replace("N9K-C", "").toLowerCase().replace(/[^a-z0-9]/g, "-");
    return `https://www.cisco.com/c/en/us/products/switches/nexus-${slug}-switch/index.html`;
  }
  // NCS 5500/5700: NCS-57C3-MOD, NCS-5504
  if (m.startsWith("NCS-")) {
    const num = m.replace("NCS-", "").toLowerCase().replace(/[^a-z0-9]/g, "-");
    return `https://www.cisco.com/c/en/us/products/routers/network-convergence-system-${num}/index.html`;
  }
  // Catalyst: C9300-48UXM, C9500-32C
  if (m.startsWith("C9")) {
    const slug = m.toLowerCase().replace(/[^a-z0-9]/g, "-");
    return `https://www.cisco.com/c/en/us/products/switches/catalyst-${slug}/index.html`;
  }
  // Cisco 8000 SP series chassis: 8101-32FH, 8202-32FH, 8608
  if (/^8[0-9]{3}/.test(m)) {
    return `https://www.cisco.com/site/us/en/products/networking/sdwan-routers/8000-series/index.html`;
  }
  // Cisco 8800 line cards (88-LC0-*, 84-MPA-*, 86-MPA-*) → same 8000 family page
  if (/^(88|84|86)-/.test(m)) {
    return `https://www.cisco.com/site/us/en/products/networking/sdwan-routers/8000-series/index.html`;
  }
  // ASR 9000 / A900 line cards only return the Cisco logo as og:image — skip
  return null;
}

function buildAlcatelLucentUrl(model: string): string | null {
  // OmniSwitch 6900-X72, OmniSwitch 9900-C32D
  const slug = model.toLowerCase().replace(/\s+/g, "-").replace(/[^a-z0-9-]/g, "");
  return `https://www.al-enterprise.com/en/products/switches/${slug}`;
}

function buildAristaUrl(model: string): string | null {
  // 7060X6-64PE → https://www.arista.com/en/products/7060x6-series/7060cx6-64pe
  // 7050CX3-32S → https://www.arista.com/en/products/7050x3-series/7050cx3-32s
  // All arista models follow: /en/products/{model-lowercase}
  const slug = model.toLowerCase().replace(/[^a-z0-9-]/g, "-");
  return `https://www.arista.com/en/products/${slug}`;
}

function buildJuniperUrl(model: string): string | null {
  const m = model.toUpperCase();
  if (m.startsWith("QFX")) {
    // QFX5130-32CD → qfx5130-32cd
    const slug = model.toLowerCase();
    return `https://www.juniper.net/us/en/products/switches/qfx-series/${slug}.html`;
  }
  if (m.startsWith("EX")) {
    const slug = model.toLowerCase();
    return `https://www.juniper.net/us/en/products/switches/ex-series/${slug}.html`;
  }
  return null;
}

function buildNvidiaUrl(model: string): string | null {
  // SN5600 → https://www.nvidia.com/en-us/networking/ethernet-switching/sn5600/
  // SN4700 → https://www.nvidia.com/en-us/networking/ethernet-switching/sn4700/
  // ConnectX-7 / BlueField are adapters, not switches — skip
  const m = model.toUpperCase();
  if (m.includes("CONNECTX") || m.includes("BLUEFIELD")) return null;
  const slug = m.replace(/[^A-Z0-9]/g, "");
  if (!slug.startsWith("SN")) return null; // only Spectrum switch series
  return `https://www.nvidia.com/en-us/networking/ethernet-switching/${slug.toLowerCase()}/`;
}

function buildEdgecoreUrl(model: string): string | null {
  // AS7726-32X, DCS810
  const slug = model.toLowerCase().replace(/[^a-z0-9-]/g, "-");
  return `https://www.edge-core.com/product/${slug}.html`;
}

function buildDellUrl(model: string): string | null {
  const slug = model.toLowerCase().replace(/[^a-z0-9-]/g, "-");
  return `https://www.dell.com/en-us/shop/networking/sf/${slug}`;
}

function buildHuaweiUrl(model: string): string | null {
  const slug = model.replace(/\s+/g, "-");
  return `https://e.huawei.com/en/products/enterprise-networking/switches/${slug}`;
}

function buildNobelUrl(_model: string): string | null {
  return null; // Nokia SROS pages require auth
}

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

// MikroTik product URL slugs for models containing '+' are not derivable from
// the model name — their website uses opaque suffixes (_in, _rm, …).
// The models without '+' follow a simple pattern (lowercase, dashes→underscore).
const MIKROTIK_SLUG_MAP: Record<string, string> = {
  "CRS305-1G-4S+":   "crs305_1g_4s_in",
  "CRS312-4C+8XG":   "crs312_4c_8xg_rm",
  "CRS317-1G-16S+":  "crs317_1g_16s_rm",
  "CRS326-24G-2S+":  "crs326_24g_2s_in",
  // CRS354-48G-4S+2Q+: URL not discoverable — MikroTik's product listing is JS-rendered
};

function buildMikroTikUrl(model: string): string | null {
  if (model in MIKROTIK_SLUG_MAP) {
    return `https://mikrotik.com/product/${MIKROTIK_SLUG_MAP[model]}`;
  }
  if (model.includes("+")) return null; // other + models — URL unknown
  // Simple lowercase + dashes→underscores for models without '+'
  const slug = model.toLowerCase().replace(/[-\s]+/g, "_").replace(/[^a-z0-9_]/g, "");
  return slug ? `https://mikrotik.com/product/${slug}` : null;
}

function buildUbiquitiUrl(model: string): string | null {
  const slug = model.toLowerCase().replace(/[^a-z0-9-]/g, "-");
  return `https://store.ui.com/us/en/products/${slug}`;
}

function buildFsComUrl(model: string): string | null {
  const slug = model.toLowerCase().replace(/[^a-z0-9-]/g, "-");
  return `https://www.fs.com/products/${slug}.html`;
}

function buildSupermicroUrl(model: string): string | null {
  const slug = model.toUpperCase();
  return `https://www.supermicro.com/en/products/switches/${slug}`;
}

function buildHpeArubaUrl(model: string): string | null {
  const slug = model.toLowerCase().replace(/[^a-z0-9-]/g, "-");
  return `https://www.arubanetworks.com/products/switches/${slug}/`;
}

function buildCelesticaUrl(model: string): string | null {
  const slug = model.toLowerCase().replace(/[^a-z0-9-]/g, "-");
  return `https://www.celestica.com/networking/${slug}`;
}

function buildAsterfusionUrl(model: string): string | null {
  const slug = model.toLowerCase().replace(/[^a-z0-9-]/g, "-");
  return `https://www.asterfusion.com/products/${slug}/`;
}

function buildFortinetUrl(_model: string): string | null {
  // Fortinet product pages are JS-rendered — og:image only returns the brand icon.
  // All /products/fortiswitch/<model> URLs redirect to the generic /ethernet-switches page.
  // Image scraping is not possible via plain HTTP for this vendor.
  return null;
}

function buildQuantaUrl(model: string): string | null {
  // QuantaMesh T3048-LY8, T7032-IX1 etc.
  const slug = model.toLowerCase().replace(/\s+/g, "-").replace(/[^a-z0-9-]/g, "");
  return `https://www.qct.io/product/index/Infrastructure-Product/Networking/Switch/${slug}`;
}

function buildAlliedTelesisUrl(model: string): string | null {
  // AT-x530-28GSX → https://www.alliedtelesis.com/us/en/products/at-x530-28gsx
  const slug = model.toLowerCase().replace(/\s+/g, "-").replace(/[^a-z0-9-]/g, "");
  return `https://www.alliedtelesis.com/us/en/products/${slug}`;
}

function buildUfispaceUrl(model: string): string | null {
  const slug = model.toLowerCase().replace(/\s+/g, "-").replace(/[^a-z0-9-]/g, "");
  return `https://www.ufispace.com/products/${slug}`;
}

function buildNetgearUrl(model: string): string | null {
  const slug = model.toLowerCase().replace(/\s+/g, "-").replace(/[^a-z0-9-]/g, "");
  return `https://www.netgear.com/business/products/switches/${slug}`;
}

// ── URL dispatcher by vendor slug ───────────────────────────────────────────

const URL_BUILDERS: Record<string, (m: string) => string | null> = {
  cisco:                        buildCiscoUrl,
  arista:                       buildAristaUrl,
  juniper:                      buildJuniperUrl,
  "nvidia-networking":          buildNvidiaUrl,
  edgecore:                     buildEdgecoreUrl,
  celestica:                    buildCelesticaUrl,
  asterfusion:                  buildAsterfusionUrl,
  fortinet:                     buildFortinetUrl,
  dell:                         buildDellUrl,
  "hpe-aruba":                  buildHpeArubaUrl,
  huawei:                       buildHuaweiUrl,
  nokia:                        buildNobelUrl,
  extreme:                      buildExtremeUrl,
  mikrotik:                     buildMikroTikUrl,
  ubiquiti:                     buildUbiquitiUrl,
  "fs-com":                     buildFsComUrl,
  supermicro:                   buildSupermicroUrl,
  "alcatel-lucent":             buildAlcatelLucentUrl,
  "alcatel-lucent-enterprise":  buildAlcatelLucentUrl, // fix: DB uses this slug
  ale:                          buildAlcatelLucentUrl,
  "quanta-cloud-technology":    buildQuantaUrl,
  "allied-telesis":             buildAlliedTelesisUrl,
  ufispace:                     buildUfispaceUrl,
  netgear:                      buildNetgearUrl,
  wistron:                      (_m) => null, // no public product pages
  aruba:                        buildHpeArubaUrl, // alias
};

// ── Generic marketing image detector ────────────────────────────────────────
// Rejects URLs that are clearly stock photos, homepages, lifestyle shots or
// any other non-product image.  Patterns found from real-world scrapes.

const GENERIC_IMAGE_PATTERNS: RegExp[] = [
  // ── Logo / brand marks (never product photos) ────────────────────────────
  /[-/_]logo[-_.]|\/logos?\//i,
  /cisco[-_]?logo/i,
  /juniper[-_]networks[-_]logo/i,
  /arista[-_]?logo/i,
  /brand[-_]?logo/i,
  /company[-_]?logo/i,
  // SVG logos often have these in path
  /\/svg\//i,
  /\.svg(\?|$)/i,
  // ── Alcatel-Lucent Enterprise generic hero images ────────────────────────
  /naas-homepag/i,
  /al-enterprise.*\/images\/naas/i,
  // ── Generic OG / social sharing defaults ─────────────────────────────────
  /og[-_]default/i,
  /default[-_](?:og|social|share|image)/i,
  /site[-_](?:default|image|og)/i,
  /social[-_](?:default|share)/i,
  /twitter[-_]default/i,
  /default[-_]thumbnail/i,
  // ── Homepage / banner / lifestyle ────────────────────────────────────────
  /\/homepage\//i,
  /hero[-_](?:banner|bg|background|image)/i,
  /banner[-_](?:bg|background)/i,
  /lifestyle/i,
  /stock[-_]?photo/i,
  /people[-_](?:at|in|with)/i,
  // ── Placeholder / fallback ────────────────────────────────────────────────
  /placeholder/i,
  /no[-_]?image/i,
  /image[-_]?not[-_]?found/i,
  /\/fallback[/-]/i,
  /missing[-_]image/i,
  // ── Generic about/press/brand pages ──────────────────────────────────────
  /\/press[-_]kit/i,
  /\/media[-_]kit/i,
  // ── Vendor error / 404 graphics ──────────────────────────────────────────
  /404[-_]error/i,
  /error[-_]graphic/i,
  // ── Navigation icon libraries ────────────────────────────────────────────
  /\/icon[-_]library\//i,
  // ── Diagrams and illustrations ───────────────────────────────────────────
  /[-_]illustration[._]/i,
  // ── Vendor 404 hero images ───────────────────────────────────────────────
  /webimage-404/i,
  // ── Moxa brand/marketing images (not product photos) ────────────────────
  /\/Brand\//i,
  /cybersecurity\.png/i,
  // ── Cookie consent / GDPR overlay images ────────────────────────────────
  /cdn\.cookielaw\.org/i,
  /cookiebot\.com/i,
  /trustarc\.com/i,
  /consent-manager/i,
];

function isGenericImage(url: string): boolean {
  return GENERIC_IMAGE_PATTERNS.some((re) => re.test(url));
}

// ── og:image extractor ──────────────────────────────────────────────────────

function extractOgImage(html: string, baseUrl: string): string | null {
  const resolve = (url: string): string | null => {
    if (!url) return null;
    let abs = url;
    if (url.startsWith("/")) {
      try { abs = new URL(url, baseUrl).toString(); } catch { return null; }
    }
    if (!abs.startsWith("http")) return null;
    if (isGenericImage(abs)) return null; // ← reject logos/marketing images
    return abs;
  };

  // Primary: og:image
  const ogM = html.match(/<meta\s+(?:property="og:image"\s+content|content="([^"]+)"\s+property="og:image")="([^"]+)"/i)
    || html.match(/<meta\s+property="og:image"\s+content="([^"]+)"/i)
    || html.match(/<meta\s+content="([^"]+)"\s+property="og:image"/i);
  if (ogM) {
    const url = ogM[2] || ogM[1];
    const resolved = resolve(url);
    if (resolved) return resolved;
  }

  // Fallback: twitter:image
  const twM = html.match(/<meta\s+name="twitter:image"\s+content="([^"]+)"/i)
    || html.match(/<meta\s+content="([^"]+)"\s+name="twitter:image"/i);
  if (twM?.[1]) {
    const resolved = resolve(twM[1]);
    if (resolved) return resolved;
  }

  // Fallback: large product image in <img src> with product keyword in path
  const imgM = html.match(/<img[^>]+src="([^"]+(?:product|switch|router|hardware)[^"]*\.(?:jpg|jpeg|png|webp))"/i);
  if (imgM?.[1]) {
    const resolved = resolve(imgM[1]);
    if (resolved) return resolved;
  }

  return null;
}

// ── HTTP fetch with timeout ─────────────────────────────────────────────────

async function fetchPageHtml(url: string): Promise<string | null> {
  try {
    const resp = await fetch(url, {
      headers: HEADERS,
      signal: AbortSignal.timeout(20_000),
      redirect: "follow",
    });
    if (!resp.ok) return null;
    const html = await resp.text();
    return html;
  } catch {
    return null;
  }
}

// ── Main scraper ────────────────────────────────────────────────────────────

export async function fetchSwitchImages(targetVendorSlug?: string): Promise<void> {
  console.log("=== Switch Image Fetcher ===\n");

  const vendorFilter = targetVendorSlug ? `AND v.slug = $1` : "";
  const params = targetVendorSlug ? [targetVendorSlug] : [];

  const { rows } = await pool.query<{
    id: string;
    model: string;
    series: string;
    vendor_slug: string;
    vendor_name: string;
    product_page_url: string | null;
    image_url: string | null;
  }>(
    `SELECT sw.id, sw.model, sw.series, sw.product_page_url, sw.image_url,
            v.slug AS vendor_slug, v.name AS vendor_name
     FROM switches sw
     JOIN vendors v ON v.id = sw.vendor_id
     WHERE (sw.image_url IS NULL OR sw.image_url = '')
       ${vendorFilter}
     ORDER BY v.slug, sw.model`,
    params,
  );

  if (rows.length === 0) {
    console.log("  All switches already have images — nothing to do.");
    return;
  }

  console.log(`  ${rows.length} switches need images\n`);

  let found = 0;
  let skipped = 0;
  let errors = 0;

  for (const row of rows) {
    const builderFn = URL_BUILDERS[row.vendor_slug];
    const productUrl = row.product_page_url || (builderFn ? builderFn(row.model) : null);

    if (!productUrl) {
      console.log(`  [SKIP] ${row.vendor_name} ${row.model} — no URL pattern`);
      skipped++;
      continue;
    }

    await sleep(3500); // 1 req/3.5s — server-friendly rate limit

    const html = await fetchPageHtml(productUrl);
    if (!html) {
      console.log(`  [FAIL] ${row.vendor_name} ${row.model} — HTTP error`);
      errors++;
      continue;
    }

    const imageUrl = extractOgImage(html, productUrl);

    if (!imageUrl) {
      console.log(`  [MISS] ${row.vendor_name} ${row.model} — no og:image on ${productUrl}`);
      skipped++;
      // Still save the product_page_url so we don't retry the same miss endlessly
      if (!row.product_page_url) {
        await pool.query(
          `UPDATE switches SET product_page_url = $2, assets_scraped_at = NOW() WHERE id = $1`,
          [row.id, productUrl],
        );
      }
      continue;
    }

    await pool.query(
      `UPDATE switches
       SET image_url = $2, product_page_url = COALESCE(product_page_url, $3), assets_scraped_at = NOW()
       WHERE id = $1`,
      [row.id, imageUrl, productUrl],
    );

    console.log(`  [OK]   ${row.vendor_name} ${row.model} → ${imageUrl.slice(0, 80)}`);
    found++;
  }

  console.log(`\n=== Switch Image Fetcher Complete ===`);
  console.log(`  Images found:  ${found}`);
  console.log(`  Skipped/miss:  ${skipped}`);
  if (errors > 0) console.warn(`  Errors:        ${errors}`);
}

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