const crypto = require("crypto");
const soap = require("soap");

const config = {
  KEY: "Your KEY",
  IV: "Your IV",
  username: "Your username",
  password: "Your password",
  WebServiceUrl:
    "https://services.asanpardakht.net/paygate/merchantservices.asmx?WSDL",
  merchantConfigurationID: "YourConfigurationID",
};

function addPadding(string, blocksize = 32) {
  const pad = blocksize - (string.length % blocksize);
  return string + String.fromCharCode(pad).repeat(pad);
}

function stripPadding(string) {
  const pad = string.charCodeAt(string.length - 1);
  return string.slice(0, -pad);
}

function encrypt(string = "") {
  const key = Buffer.from(config.KEY, "base64");
  const iv = Buffer.from(config.IV, "base64");
  const cipher = crypto.createCipheriv("aes-256-cbc", key, iv);
  let encrypted = cipher.update(addPadding(string), "utf8", "base64");
  encrypted += cipher.final("base64");
  return encrypted;
}

function decrypt(string = "") {
  const key = Buffer.from(config.KEY, "base64");
  const iv = Buffer.from(config.IV, "base64");
  const decipher = crypto.createDecipheriv("aes-256-cbc", key, iv);
  let decrypted = decipher.update(string, "base64", "utf8");
  decrypted += decipher.final("utf8");
  return stripPadding(decrypted);
}

async function encryptWS(string = "") {
  try {
    const client = await soap.createClientAsync(
      "https://services.asanpardakht.net/paygate/internalutils.asmx?WSDL"
    );
    const args = {
      aesKey: config.KEY,
      aesVector: config.IV,
      toBeEncrypted: string,
    };
    const result = await client.EncryptInAESAsync(args);
    return result[0].EncryptInAESResult;
  } catch (err) {
    console.error("Error in EncryptWS:", err);
    throw err;
  }
}

async function decryptWS(string = "") {
  try {
    const client = await soap.createClientAsync(
      "https://services.asanpardakht.net/paygate/internalutils.asmx?WSDL"
    );
    const args = {
      aesKey: config.KEY,
      aesVector: config.IV,
      toBeDecrypted: string,
    };
    const result = await client.DecryptInAESAsync(args);
    return result[0].DecryptInAESResult;
  } catch (err) {
    console.error("Error in DecryptWS:", err);
    throw err;
  }
}

module.exports = { config, encrypt, decrypt, encryptWS, decryptWS };