#!/usr/bin/env node
/**
 * EMEX HTTP-only VIN decode test
 * Tests replacing Playwright scraper with pure fetch + HTML parsing
 * Run: node scripts/emex-http-test.js <VIN>
 */

const vin = process.argv[2] || "NM417800006410193";
const BASE = "https://emexdwc.ae";
const UA = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36";

async function fetchHtml(url) {
  const t0 = Date.now();
  const res = await fetch(url, {
    headers: { "User-Agent": UA, "Accept": "text/html,application/xhtml+xml" },
    redirect: "follow",
  });
  const html = await res.text();
  const ms = Date.now() - t0;
  console.log(`  [${res.status}] ${url.replace(BASE, "")} — ${html.length} bytes, ${ms}ms`);
  return { html, status: res.status, ms };
}

/**
 * Parse Vehicles.aspx response — extract vehicle list
 */
function parseVehiclesList(html) {
  // Match <tr onclick="window.location = 'Vehicle.aspx?...'" ...>
  //   <td><a href="Vehicle.aspx?c=X&vid=Y&ssd=Z&...">LABEL</a></td>
  const linkRx = /href="(Vehicle\.aspx\?[^"]+)">([^<]+)<\/a>/g;
  const seen = new Set();
  const vehicles = [];
  let m;
  while ((m = linkRx.exec(html)) !== null) {
    const href = m[1].replace(/&amp;/g, "&");
    const label = m[2].trim();
    if (seen.has(href)) continue;
    seen.add(href);
    const params = new URLSearchParams(href.replace("Vehicle.aspx?", ""));
    const c = params.get("c");
    const vid = params.get("vid");
    const ssd = params.get("ssd");
    // Parse model and year range from label like "SIENA [SIENA EXTRA EUROPA REST.(2002-2012)]"
    const modelMatch = label.match(/^([^\[]+)/);
    const yearMatch = label.match(/\((\d{4})/);
    vehicles.push({
      label,
      catalogCode: c,
      vid,
      ssd,
      model: modelMatch ? modelMatch[1].trim() : label,
      yearFrom: yearMatch ? parseInt(yearMatch[1]) : null,
      quickGroupsUrl: c && vid != null && ssd
        ? `${BASE}/QuickGroups.aspx?c=${c}&vid=${vid}&ssd=${encodeURIComponent(ssd)}`
        : null,
    });
  }
  return vehicles;
}

/**
 * Parse QuickGroups.aspx response — extract flat category list
 */
function parseCategories(html) {
  // Category links go to QuickDetails.aspx?c=X&gid=Y&vid=Z&ssd=...
  const catRx = /href="(QuickDetails\.aspx\?[^"]+)">([^<]+)<\/a>/g;
  const seen = new Set();
  const cats = [];
  let m;
  while ((m = catRx.exec(html)) !== null) {
    const href = m[1].replace(/&amp;/g, "&");
    const label = m[2].trim();
    if (label.length < 2 || seen.has(href)) continue;
    seen.add(href);
    const params = new URLSearchParams(href.replace("QuickDetails.aspx?", ""));
    cats.push({
      gid: params.get("gid"),
      name: label,
      url: `${BASE}/${href}`,
    });
  }
  return cats;
}

/**
 * Determine brand from catalog code (EMEX catalog code → brand)
 */
function brandFromCatalogCode(c) {
  if (!c) return null;
  const map = {
    BMW: "BMW", MB: "Mercedes-Benz", AU: "Audi", VW: "Volkswagen",
    FIAT: "Fiat", RFIAT: "Alfa Romeo", FORD: "Ford", RENAULT: "Renault",
    TOYOTA: "Toyota", HONDA: "Honda", KIA: "Kia", HYUNDAI: "Hyundai",
    PORSCHE: "Porsche", SUBARU: "Subaru", MAZDA: "Mazda", PEUGEOT: "Peugeot",
    CPSA: "Citroën/Peugeot",
  };
  for (const [prefix, brand] of Object.entries(map)) {
    if (c.toUpperCase().includes(prefix)) return brand;
  }
  // Extract letters from code like "FFIAT84" → FIAT
  const letterMatch = c.replace(/[0-9]/g, "").replace(/^[A-Z]/, "");
  return letterMatch || c;
}

async function decodeVin(vin) {
  console.log(`\n=== EMEX HTTP VIN Decode: ${vin} ===`);
  const t0 = Date.now();

  // Step 1: VIN search — no session/login needed!
  const { html: vinHtml } = await fetchHtml(`${BASE}/Vehicles.aspx?ft=findByVIN&c=&ssd=&vin=${vin}`);
  const vehicles = parseVehiclesList(vinHtml);
  console.log(`\nFound ${vehicles.length} vehicle(s):`);
  vehicles.forEach((v, i) => console.log(`  [${i}] ${v.label} (c=${v.catalogCode})`));

  if (vehicles.length === 0) {
    console.log("\n✗ No vehicles found — VIN not in EMEX database");
    return null;
  }

  const v = vehicles[0];
  const brand = brandFromCatalogCode(v.catalogCode);

  console.log(`\nVehicle data:`);
  console.log(`  Brand:    ${brand}`);
  console.log(`  Model:    ${v.model}`);
  console.log(`  Year:     ${v.yearFrom}`);
  console.log(`  CatCode:  ${v.catalogCode}`);
  console.log(`  QG URL:   ${v.quickGroupsUrl}`);

  // Step 2: Fetch categories from QuickGroups.aspx
  let categories = [];
  if (v.quickGroupsUrl) {
    const { html: qgHtml } = await fetchHtml(v.quickGroupsUrl);
    categories = parseCategories(qgHtml);
    console.log(`\nCategories (${categories.length}):`);
    categories.slice(0, 10).forEach((c) => console.log(`  [${c.gid}] ${c.name}`));
    if (categories.length > 10) console.log(`  ... and ${categories.length - 10} more`);
  }

  const total = Date.now() - t0;
  console.log(`\n✓ Total time: ${total}ms`);
  console.log(`  (Playwright baseline was ~10-20s)`);

  return { brand, model: v.model, year: v.yearFrom, catalogCode: v.catalogCode, ssd: v.ssd, quickGroupsUrl: v.quickGroupsUrl, categories };
}

decodeVin(vin).catch(console.error);