import { lstat, readFile, readdir } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { verifyPcre2Pack } from "./pcre2-engine-pack.mjs";

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const arguments_ = process.argv.slice(2);

if (arguments_.length > 0) {
  if (arguments_.length !== 2 || arguments_[0] !== "--pcre2-pack") {
    throw new Error(
      "Usage: node scripts/verify-engine-assets.mjs [--pcre2-pack PATH]",
    );
  }
  const pack = path.resolve(root, arguments_[1]);
  const metadata = await verifyPcre2Pack(pack, root);
  console.log(
    `Verified staged PCRE2 ${metadata.engineVersion} pack and WebAssembly bridge smoke test.`,
  );
  process.exit(0);
}

const engineDirectory = path.join(root, "dist", "engines");
const details = await lstat(engineDirectory);
if (details.isSymbolicLink() || !details.isDirectory()) {
  throw new Error("dist/engines must be a real directory.");
}

const entries = (await readdir(engineDirectory, { withFileTypes: true })).sort(
  (left, right) =>
    left.name < right.name ? -1 : left.name > right.name ? 1 : 0,
);
if (
  entries.length !== 2 ||
  !entries[0]?.isFile() ||
  entries[0].name !== "README.md" ||
  !entries[1]?.isDirectory() ||
  entries[1].name !== "pcre2"
) {
  throw new Error(
    "The production build must contain only README.md and the declared PCRE2 pack.",
  );
}

const notice = await readFile(path.join(engineDirectory, "README.md"), "utf8");
if (!notice.includes("native `RegExp`") || !notice.includes("PCRE2 10.47")) {
  throw new Error("The engine asset notice does not describe this release.");
}
await verifyPcre2Pack(path.join(engineDirectory, "pcre2"), root);

console.log("Verified native ECMAScript and bundled PCRE2 engine assets.");