/**
 * Juniper HCT Scraper — OEM Hardware Compatibility Tool
 *
 * apps.juniper.net/hct — Next.js SSR app with product data embedded in
 * self.__next_f.push() payloads. Transceivers category = 100001.
 * Rich data: modelNumber, partNumber, distance, speedType, formFactor, EOL status.
 * No prices (OEM), but excellent compatibility + spec data.
 */
import { pool, findOrCreateScrapedTransceiver, ensureVendor } from "../utils/db";

const BASE = "https://apps.juniper.net/hct";
const HEADERS = {
  "User-Agent": "Mozilla/5.0 (compatible; TIP-Bot/1.0; research)",
  Accept: "text/html,application/xhtml+xml",
};

const CATEGORIES = [
  { id: 100001, name: "Transceivers" },
];

interface JuniperTransceiver {
  modelNumber: string;
  partNumber: string;
  description: string;
  cableType: string;
  distance: string;
  speedType: string;
  formFactor: string;
  connectorType: string;
  maxDistanceKm?: number;
  maxDistanceLabel?: string;
  isModelEol: boolean;
}

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

function parseSpeedGbps(speedType: string): { speed: string; speedGbps: number } {
  const lower = speedType.toLowerCase();
  if (lower.includes("800g")) return { speed: "800G", speedGbps: 800 };
  if (lower.includes("400g")) return { speed: "400G", speedGbps: 400 };
  if (lower.includes("200g")) return { speed: "200G", speedGbps: 200 };
  if (lower.includes("100g")) return { speed: "100G", speedGbps: 100 };
  if (lower.includes("40g")) return { speed: "40G", speedGbps: 40 };
  if (lower.includes("25g")) return { speed: "25G", speedGbps: 25 };
  if (lower.includes("10g")) return { speed: "10G", speedGbps: 10 };
  if (lower.includes("1g") || lower.includes("1000")) return { speed: "1G", speedGbps: 1 };
  return { speed: speedType || "Unknown", speedGbps: 0 };
}

function normalizeFormFactor(ff: string): string {
  const upper = ff.toUpperCase().trim();
  if (upper.includes("QSFP-DD") || upper.includes("QSFPDD")) return "QSFP-DD";
  if (upper.includes("QSFP28")) return "QSFP28";
  if (upper.includes("QSFP+") || upper === "QSFP") return "QSFP+";
  if (upper.includes("OSFP")) return "OSFP";
  if (upper.includes("CFP2")) return "CFP2";
  if (upper.includes("CFP4")) return "CFP4";
  if (upper.includes("CFP")) return "CFP";
  if (upper.includes("SFP56")) return "SFP56";
  if (upper.includes("SFP28")) return "SFP28";
  if (upper.includes("SFP+")) return "SFP+";
  if (upper.includes("XFP")) return "XFP";
  if (upper.includes("SFP")) return "SFP";
  return ff || "SFP";
}

function detectFiber(cableType: string, description: string): string {
  const text = `${cableType} ${description}`.toLowerCase();
  if (/smf|single.?mode/.test(text)) return "SMF";
  if (/mmf|multi.?mode/.test(text)) return "MMF";
  if (/copper|dac|twinax|cat\s*[56]|rj.?45|base-t/.test(text)) return "Copper";
  return "";
}

function parseDistance(distance: string): { label: string; meters: number } | undefined {
  if (!distance) return undefined;
  const km = distance.match(/([\d.]+)\s*km/i);
  if (km) return { label: `${km[1]}km`, meters: Math.round(parseFloat(km[1]) * 1000) };
  const m = distance.match(/([\d.]+)\s*m\b/i);
  if (m) return { label: `${m[1]}m`, meters: parseInt(m[1]) };
  return undefined;
}

function detectWavelength(description: string): string {
  const match = description.match(/(\d{3,4})\s*nm/i);
  return match ? match[1] : "";
}

/**
 * Extract transceiver data from Next.js SSR payload.
 * Data is embedded in self.__next_f.push([...]) with escaped JSON (\" not ").
 * Strategy: unescape the HTML, find categoryDetail array, parse each object.
 */
function parseNextJsData(html: string): JuniperTransceiver[] {
  const transceivers: JuniperTransceiver[] = [];

  // Unescape the escaped JSON (\" → ", \\ → \)
  const unescaped = html.replace(/\\"/g, '"').replace(/\\\\"/g, '\\"');

  // Find categoryDetail array and extract individual objects
  const detailIdx = unescaped.indexOf('"categoryDetail":[');
  if (detailIdx === -1) {
    console.log("  Warning: categoryDetail not found in HTML");
    return transceivers;
  }

  // Extract from categoryDetail to end of array
  const arrayStart = unescaped.indexOf("[", detailIdx);
  if (arrayStart === -1) return transceivers;

  // Use regex to find each transceiver object by modelNumber
  const modelRegex = /"modelNumber"\s*:\s*"([^"]+)"/g;
  const seen = new Set<string>();
  let match;

  while ((match = modelRegex.exec(unescaped)) !== null) {
    const modelNumber = match[1];
    if (seen.has(modelNumber)) continue;
    seen.add(modelNumber);

    // Extract chunk around this model
    const idx = match.index;
    const objStart = unescaped.lastIndexOf("{", idx);
    const chunk = unescaped.slice(objStart, objStart + 2000);

    const getString = (field: string): string => {
      const re = new RegExp(`"${field}"\\s*:\\s*"([^"]*)"`, "i");
      const m = chunk.match(re);
      return m ? m[1] : "";
    };

    // For array fields like cableType:["SMF"], speedType:[{speed:"100G"}], formFactor:["CFP"]
    const getArrayFirst = (field: string): string => {
      // Try ["value"] pattern
      const arrRe = new RegExp(`"${field}"\\s*:\\s*\\[\\s*"([^"]*)"`, "i");
      const arrM = chunk.match(arrRe);
      if (arrM) return arrM[1];
      // Try [{speed:"value"}] pattern
      const objRe = new RegExp(`"${field}"\\s*:\\s*\\[\\s*\\{\\s*"\\w+"\\s*:\\s*"([^"]*)"`, "i");
      const objM = chunk.match(objRe);
      if (objM) return objM[1];
      return getString(field);
    };

    const getBool = (field: string): boolean => {
      const re = new RegExp(`"${field}"\\s*:\\s*(true|false)`, "i");
      const m = chunk.match(re);
      return m ? m[1] === "true" : false;
    };

    const getNum = (field: string): number | undefined => {
      const re = new RegExp(`"${field}"\\s*:\\s*(\\d+(?:\\.\\d+)?)`, "i");
      const m = chunk.match(re);
      return m ? parseFloat(m[1]) : undefined;
    };

    // Extract distance from array like ["40 km"] or from maxDistanceLabel
    const distArr = chunk.match(/"distance"\s*:\s*\[\s*"([^"]*)"/i);
    const distance = distArr ? distArr[1] : getString("maxDistanceLabel");

    transceivers.push({
      modelNumber,
      partNumber: getString("partNumber") || getString("oldPartNumber") || modelNumber,
      description: getString("description"),
      cableType: getArrayFirst("cableType"),
      distance,
      speedType: getArrayFirst("speedType"),
      formFactor: getArrayFirst("formFactor"),
      connectorType: getString("connectorType"),
      maxDistanceKm: getNum("maxDistanceKm"),
      maxDistanceLabel: getString("maxDistanceLabel"),
      isModelEol: getBool("isModelEol"),
    });
  }

  return transceivers;
}

async function fetchPage(url: string): Promise<string> {
  const resp = await fetch(url, { headers: HEADERS, signal: AbortSignal.timeout(60000) });
  if (!resp.ok) throw new Error(`HTTP ${resp.status} for ${url}`);
  return resp.text();
}

export async function scrapeJuniperHct(): Promise<void> {
  console.log("=== Juniper HCT Scraper Starting ===\n");

  const vendorId = await ensureVendor("Juniper Networks", "oem", "https://www.juniper.net", "https://apps.juniper.net/hct/");

  let totalProducts = 0;

  for (const cat of CATEGORIES) {
    console.log(`\n--- ${cat.name} (category ${cat.id}) ---`);

    try {
      const html = await fetchPage(`${BASE}/category/${cat.id}`);
      console.log(`  Fetched ${(html.length / 1024).toFixed(0)}KB`);

      const transceivers = parseNextJsData(html);
      console.log(`  Parsed ${transceivers.length} transceivers`);

      for (const tx of transceivers) {
        try {
          const speedInfo = parseSpeedGbps(tx.speedType || tx.description);
          const distInfo = tx.maxDistanceKm
            ? { label: `${tx.maxDistanceKm}km`, meters: Math.round(tx.maxDistanceKm * 1000) }
            : parseDistance(tx.distance);
          const formFactor = normalizeFormFactor(tx.formFactor);

          await findOrCreateScrapedTransceiver({
            partNumber: tx.modelNumber, vendorId,
            formFactor, speedGbps: speedInfo.speedGbps,
            speed: speedInfo.speed, reachMeters: distInfo?.meters,
            reachLabel: distInfo?.label,
            fiberType: detectFiber(tx.cableType, tx.description),
            wavelengths: detectWavelength(tx.description),
            category: "DataCenter",
          });

          totalProducts++;
        } catch (err) {
          console.warn(`    Error [${tx.modelNumber}]: ${(err as Error).message.slice(0, 80)}`);
        }
      }
    } catch (err) {
      console.error(`  Category failed: ${(err as Error).message}`);
    }

    await sleep(2000);
  }

  console.log(`\n=== Juniper HCT Complete: ${totalProducts} transceivers (no prices - OEM) ===`);
}

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