import { webcrypto as crypto } from "node:crypto";

export async function encrypt(
  plainText: string,
  keyString: string | undefined,
): Promise<string> {
  if (!keyString) {
    throw new Error("Unable to encrypt the feature list.");
  }
  const bufToBase64 = (x: ArrayBuffer) => Buffer.from(x).toString("base64");
  const key = await crypto.subtle.importKey(
    "raw",
    Buffer.from(keyString, "base64"),
    {
      name: "AES-CBC",
      length: 128,
    },
    true,
    ["encrypt", "decrypt"],
  );
  const iv = crypto.getRandomValues(new Uint8Array(16));
  const encryptedBuffer = await crypto.subtle.encrypt(
    {
      name: "AES-CBC",
      iv,
    },
    key,
    new TextEncoder().encode(plainText),
  );
  return bufToBase64(iv) + "." + bufToBase64(encryptedBuffer);
}