import crypto from 'crypto';

const UPPER = 'ABCDEFGHJKLMNPQRSTUVWXYZ';
const LOWER = 'abcdefghjkmnpqrstuvwxyz';
const DIGITS = '23456789';
const SPECIAL = '!@#$%&*';

export function generateSecurePassword(length = 16): string {
  const all = UPPER + LOWER + DIGITS + SPECIAL;
  const pick = (chars: string) => chars[crypto.randomInt(chars.length)];

  const required = [pick(UPPER), pick(LOWER), pick(DIGITS), pick(SPECIAL)];
  const rest = Array.from({ length: Math.max(length - required.length, 0) }, () =>
    pick(all),
  );
  const combined = [...required, ...rest];
  for (let i = combined.length - 1; i > 0; i--) {
    const j = crypto.randomInt(i + 1);
    [combined[i], combined[j]] = [combined[j], combined[i]];
  }
  return combined.join('');
}

export function hashResetToken(token: string): string {
  return crypto.createHash('sha256').update(token).digest('hex');
}

export function generateResetToken(): string {
  return crypto.randomBytes(32).toString('hex');
}