import { format, addYears } from 'date-fns';

function generateRandomNumber(min, max) {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

function generateRandomDate(years = 5) {
  const currentDate = new Date();
  const futureDate = addYears(currentDate, years); // Use addYears from date-fns
  const randomTimestamp = generateRandomNumber(currentDate.getTime(), futureDate.getTime()); // Generate random timestamp between current date and future date
  return new Date(randomTimestamp);
}

function generateLuhnCheckDigit(number) {
  let sum = 0;
  let shouldDouble = false;
  for (let i = number.length - 1; i >= 0; i--) {
    let digit = parseInt(number.charAt(i), 10);
    if (shouldDouble) {
      digit *= 2;
      if (digit > 9) digit -= 9;
    }
    sum += digit;
    shouldDouble = !shouldDouble;
  }
  const checkDigit = (10 - (sum % 10)) % 10;
  return checkDigit;
}

function generateSecurityCode() {
  return String(generateRandomNumber(0, 999)).padStart(3, '0');
}

function generateVisaCardNumber() {
  const visaPrefix = '4'; // Visa card numbers typically start with '4'
  const randomPart = String(generateRandomNumber(100000000000000, 999999999999999)); // Example length, adjust as needed
  const partialNumber = visaPrefix + randomPart;
  const luhnDigit = generateLuhnCheckDigit(partialNumber);
  return partialNumber + luhnDigit;
}

function main() {
  const cardNumber = generateVisaCardNumber();
  console.log(`Card Number: ${cardNumber}`);
  console.log(`Expiration Date: ${format(generateRandomDate(), 'MM/yy')}`);
  console.log(`Security Code: ${generateSecurityCode()}`);
}

main();