// One-off script: freeze the current 74-image product-scan Validation Set into
// a dedicated, stable folder (sources/product-test-images-fixed/) so re-running
// the accuracy harness always scores the exact same images, independent of
// whatever new photos get dropped into the live-intake folder
// (sources/product-test-images/, still fed by the /manual-label-scan page).
// Renames each image "<index> <no_sku>.<ext>" (index = its stable position,
// 1-based) and updates product_manual_labels.json's flat-filename entries to
// match. Run once from backend/: node scripts/freeze-validation-set.mjs
import fs from "fs";
import path from "path";

const LIVE_DIR = path.join("sources", "product-test-images");
const FIXED_DIR = path.join("sources", "product-test-images-fixed");
const LABELS_PATH = path.join("sources", "product_manual_labels.json");

const labels = JSON.parse(fs.readFileSync(LABELS_PATH, "utf8"));
const flatEntries = labels.filter((l) => !l.filename.includes("/"));

if (!fs.existsSync(FIXED_DIR)) fs.mkdirSync(FIXED_DIR, { recursive: true });

// Resolve by SKU prefix (not entry.filename directly) so this script is
// idempotent/rerunnable even after a previous run already renamed
// entry.filename to "<index> <sku>.<ext>" — the live-intake folder always
// keeps its original "<sku> <product>__<camera-filename>.<ext>" names.
const liveFiles = fs.readdirSync(LIVE_DIR);
function findSourceFile(no_sku) {
  const match = liveFiles.find((f) => f.startsWith(`${no_sku} `) || f.startsWith(`${no_sku}__`));
  if (!match) return null;
  return path.join(LIVE_DIR, match);
}

let copied = 0;
flatEntries.forEach((entry, i) => {
  const index = i + 1;
  const srcPath = findSourceFile(entry.no_sku);
  if (!srcPath) {
    throw new Error(`Missing source image for ${entry.no_sku} in ${LIVE_DIR}`);
  }
  const ext = path.extname(srcPath);
  const newFilename = `${index} ${entry.no_sku}${ext}`;
  fs.copyFileSync(srcPath, path.join(FIXED_DIR, newFilename));
  entry.filename = newFilename;
  copied++;
});

fs.writeFileSync(LABELS_PATH, JSON.stringify(labels, null, 2), "utf8");
console.log(`Copied ${copied} images into ${FIXED_DIR} and updated ${LABELS_PATH}.`);