// License-firewall CI guard.
//
// Every vendored asset under public/illustrations/ (and public/lottie/) MUST have a
// row in public/illustrations/assets.json. No row -> the asset may not ship. Fails
// the build (exit 1) on any un-ledgered file. Run: npm run check:assets
import { readFileSync, readdirSync, statSync, existsSync } from "node:fs";
import { join, dirname, relative } from "node:path";
import { fileURLToPath } from "node:url";

const __dirname = dirname(fileURLToPath(import.meta.url));
const PUBLIC = join(__dirname, "..", "public");
const ILLUS = join(PUBLIC, "illustrations");
const ledgerPath = join(ILLUS, "assets.json");

if (!existsSync(ledgerPath)) {
  console.error(`MISSING license ledger: ${ledgerPath}`);
  process.exit(1);
}
const ledger = JSON.parse(readFileSync(ledgerPath, "utf8"));

function walk(dir) {
  if (!existsSync(dir)) return [];
  let out = [];
  for (const e of readdirSync(dir)) {
    const p = join(dir, e);
    if (statSync(p).isDirectory()) out = out.concat(walk(p));
    else if (/\.(svg|json|mp3|wav|ogg|m4a)$/i.test(e) && e !== "assets.json") out.push(p);
  }
  return out;
}

// Ledger keys: illustrations are relative to illustrations/ (e.g. dicebear/x.svg);
// lottie + audio carry their folder prefix (lottie/x.json, audio/x.mp3).
const SCAN = [
  { root: ILLUS, prefix: "" },
  { root: join(PUBLIC, "lottie"), prefix: "lottie/" },
  { root: join(PUBLIC, "audio"), prefix: "audio/" },
];
const files = SCAN.flatMap(({ root, prefix }) =>
  walk(root).map((p) => prefix + relative(root, p).split("\\").join("/"))
);

const missing = files.filter((f) => !ledger[f]);
if (missing.length) {
  console.error(`Un-ledgered assets (add a row to assets.json):\n  ${missing.join("\n  ")}`);
  process.exit(1);
}
console.log(`assets.json OK — ${files.length} vendored asset(s), all ledgered.`);