/**
 * SmartOptics Scraper — Premium coherent/DWDM transceiver manufacturer
 *
 * smartoptics.com — WordPress site, no prices (B2B, RFQ model).
 * Scrapes product catalog for specs, images, datasheets.
 * Products listed at /products/optical-transceivers/ → individual /product/SKU/ pages.
 */
import { pool, findOrCreateScrapedTransceiver, ensureVendor } from "../utils/db";

const BASE = "https://smartoptics.com";
const CATALOG_URL = `${BASE}/products/optical-transceivers/`;
const HEADERS = {
  "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
  Accept: "text/html,application/xhtml+xml",
};

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

function detectFormFactor(text: string): { formFactor: string; speed: string; speedGbps: number } {
  const t = text.toLowerCase();
  if (t.includes("qsfp-dd800") || t.includes("sfp-dd800") || t.includes("800ge")) return { formFactor: "QSFP-DD", speed: "800G", speedGbps: 800 };
  if (t.includes("qsfp-dd") || (t.includes("400g") && t.includes("qsfp")))         return { formFactor: "QSFP-DD", speed: "400G", speedGbps: 400 };
  if (t.includes("qsfp112"))                                                         return { formFactor: "QSFP112", speed: "400G", speedGbps: 400 };
  if (t.includes("qsfp56"))                                                          return { formFactor: "QSFP56", speed: "200G", speedGbps: 200 };
  if (t.includes("qsfp28") || t.includes("100ge") || t.includes("100g"))            return { formFactor: "QSFP28", speed: "100G", speedGbps: 100 };
  if (t.includes("sfp28") || t.includes("25g"))                                     return { formFactor: "SFP28", speed: "25G", speedGbps: 25 };
  if (t.includes("qsfp+") || t.includes("40g"))                                     return { formFactor: "QSFP+", speed: "40G", speedGbps: 40 };
  if (t.includes("sfp+") || t.includes("10g"))                                      return { formFactor: "SFP+", speed: "10G", speedGbps: 10 };
  if (t.includes("sfp"))                                                             return { formFactor: "SFP", speed: "1G", speedGbps: 1 };
  return { formFactor: "QSFP28", speed: "100G", speedGbps: 100 };
}

function detectReach(text: string): { label: string; meters: number } | undefined {
  const kmMatch = text.match(/(\d+)\s*km/i);
  if (kmMatch) {
    const km = parseInt(kmMatch[1]);
    return { label: `${km}km`, meters: km * 1000 };
  }
  const mMatch = text.match(/(\d+)\s*m\b/i);
  if (mMatch) {
    const m = parseInt(mMatch[1]);
    return { label: `${m}m`, meters: m };
  }
  return undefined;
}

function detectFiber(text: string): string {
  if (/dwdm|cwdm|coherent|coh|single.?mode|smf/i.test(text)) return "SMF";
  if (/multi.?mode|mmf|sr/i.test(text)) return "MMF";
  return "SMF"; // SmartOptics is almost exclusively SMF/coherent
}

async function fetchPage(url: string): Promise<string> {
  const resp = await fetch(url, { headers: HEADERS, signal: AbortSignal.timeout(30000) });
  if (!resp.ok) throw new Error(`HTTP ${resp.status} for ${url}`);
  return resp.text();
}

function extractProductUrls(html: string): string[] {
  const urls = new Set<string>();
  const regex = /href="(https?:\/\/smartoptics\.com\/product\/[^"]+)"/gi;
  let m: RegExpExecArray | null;
  while ((m = regex.exec(html)) !== null) {
    const u = m[1].replace(/\/$/, "") + "/";
    urls.add(u);
  }
  return Array.from(urls);
}

interface ProductData {
  sku: string;
  name: string;
  url: string;
  imageUrl?: string;
  formFactor: string;
  speed: string;
  speedGbps: number;
  reachLabel?: string;
  reachMeters?: number;
  fiberType: string;
  coherent: boolean;
  wdmType?: string;
}

async function scrapeProductPage(url: string): Promise<ProductData | null> {
  try {
    const html = await fetchPage(url);

    const nameMatch = html.match(/<h1[^>]*>([^<]+)<\/h1>/) || html.match(/og:title" content="([^"]+)"/);
    const name = nameMatch ? nameMatch[1].trim().replace(/ \| Smartoptics$/, "") : "";
    if (!name) return null;

    const sku = url.split("/").filter(Boolean).pop()?.toUpperCase() || name.replace(/\s+/g, "-");

    const imgMatch = html.match(/property="og:image" content="([^"]+)"/)
      || html.match(/<img[^>]+src="([^"]*wp-content\/uploads[^"]*\.(?:png|jpg|webp))"[^>]* class="[^"]*product/i);
    const imageUrl = imgMatch ? imgMatch[1] : undefined;

    const ff = detectFormFactor(name);
    const reach = detectReach(name);
    const coherent = /coherent|coh-t|coh\.|dwdm|dp-qpsk|qpsk|cfp2/i.test(name + html.slice(0, 3000));
    const wdmType = /dwdm/i.test(name) ? "DWDM" : /cwdm/i.test(name) ? "CWDM" : undefined;

    return {
      sku, name, url, imageUrl,
      ...ff,
      reachLabel: reach?.label,
      reachMeters: reach?.meters,
      fiberType: detectFiber(name),
      coherent,
      wdmType,
    };
  } catch (err) {
    console.warn(`  Failed ${url}: ${(err as Error).message}`);
    return null;
  }
}

export async function scrapeSmartOptics(): Promise<void> {
  console.log("=== SmartOptics Scraper Starting ===\n");
  console.log("Note: SmartOptics is B2B — no public prices. Scraping specs + images only.\n");

  const vendorId = await ensureVendor(
    "SmartOptics",
    "manufacturer",
    "https://www.smartoptics.com",
    "https://smartoptics.com/products/optical-transceivers/"
  );

  const productUrls = new Set<string>();
  for (let page = 1; page <= 10; page++) {
    try {
      const url = page === 1 ? CATALOG_URL : `${CATALOG_URL}page/${page}/`;
      const html = await fetchPage(url);
      const urls = extractProductUrls(html);
      if (urls.length === 0) break;
      urls.forEach((u) => productUrls.add(u));
      console.log(`  Catalog page ${page}: ${urls.length} products`);
      await sleep(1500);
    } catch {
      break;
    }
  }

  console.log(`\nTotal product URLs: ${productUrls.size}`);
  if (productUrls.size === 0) {
    console.log("No products found — site may have changed structure");
    return;
  }

  let saved = 0;
  let withImages = 0;

  for (const url of productUrls) {
    const product = await scrapeProductPage(url);
    if (!product) continue;

    try {
      await findOrCreateScrapedTransceiver({
        partNumber: product.sku,
        vendorId,
        formFactor: product.formFactor,
        speedGbps: product.speedGbps,
        speed: product.speed,
        reachMeters: product.reachMeters,
        reachLabel: product.reachLabel,
        fiberType: product.fiberType,
        wavelengths: product.wdmType ? "DWDM-tunable" : undefined,
        category: product.coherent ? "Coherent" : "DataCenter",
        imageUrl: product.imageUrl,
      });
      saved++;
      if (product.imageUrl) withImages++;
      console.log(`  ✓ ${product.sku} — ${product.name.slice(0, 60)}`);
    } catch (err) {
      console.warn(`  Error saving ${product.sku}: ${(err as Error).message.slice(0, 80)}`);
    }
    await sleep(1500);
  }

  console.log(`\n=== SmartOptics Complete: ${saved} products, ${withImages} with images ===`);
}

if (require.main === module) {
  scrapeSmartOptics()
    .then(() => pool.end())
    .catch((err) => { console.error("Fatal:", err); pool.end(); process.exit(1); });
}