"use strict";

const DEFAULT_KEY = "jms-gc110n-log-obfuscate-default";

function getKey() {
  return process.env.JMS_LOG_KEY || DEFAULT_KEY;
}

function obfuscate(text) {
  if (!text) return text;
  const key = Buffer.from(getKey(), "utf-8");
  const data = Buffer.from(text, "utf-8");
  const out = Buffer.alloc(data.length);
  for (let i = 0; i < data.length; i++) {
    out[i] = data[i] ^ key[i % key.length];
  }
  return "[OBF]" + out.toString("base64");
}

function deobfuscate(encoded) {
  if (!encoded) return encoded;
  if (encoded.startsWith("[OBF]")) {
    encoded = encoded.slice(5);
  }
  const key = Buffer.from(getKey(), "utf-8");
  const data = Buffer.from(encoded, "base64");
  const out = Buffer.alloc(data.length);
  for (let i = 0; i < data.length; i++) {
    out[i] = data[i] ^ key[i % key.length];
  }
  return out.toString("utf-8");
}

module.exports = { obfuscate, deobfuscate };