import { OTP } from '@se-oss/otp';

// Generate a new OTP instance with default options
const otp = OTP.generate();

// You can access the secret to store it for later use
console.log('Generated Secret:', otp.secret);
// e.g., store otp.secret in your database for a user

import { OTP } from '@se-oss/otp';

const existingSecret = 'GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ'; // User's secret from your database

const otp = new OTP({ secret: existingSecret });

// Assuming 'otp' is an OTP instance from the examples above

// Generate a TOTP code
const code = otp.totp();
console.log('Current TOTP code:', code);

// To verify a code from the user:
const userCode = '123456'; // Code provided by the user
const isValid = otp.totpVerify({ code: userCode });

if (isValid) {
  console.log('✅ Code is valid!');
} else {
  console.log('❌ Code is invalid!');
}

// You can also check a wider window of time (e.g., 2 steps back, 2 steps forward)
const isValidWithWindow = otp.totpVerify({ code: userCode, window: 2 });

// Assuming 'otp' is an OTP instance from the examples above

const counter = 1; // This should be stored and incremented on your server

// Generate an HOTP code
const code = otp.hotp({ counter });
console.log(`HOTP code for counter ${counter}:`, code);

// To verify a code from the user:
const userCode = '755224'; // Code provided by the user for counter 1
const isValid = otp.hotpVerify({ code: userCode, counter });

if (isValid) {
  console.log('✅ Code is valid!');
  // IMPORTANT: Increment the counter for this user for the next verification
} else {
  console.log('❌ Code is invalid!');
}