import fs from 'fs';
import path from 'path';

const OTP_FILE = path.join(process.cwd(), 'auth-otp.json');

interface OTPData {
  code: string;
  expiresAt: number;
}

export function generateOTP(): string {
  return Math.floor(100000 + Math.random() * 900000).toString();
}

export function saveOTP(code: string) {
  const data: OTPData = {
    code,
    expiresAt: Date.now() + 5 * 60 * 1000 // 5 minutes
  };
  try {
    fs.writeFileSync(OTP_FILE, JSON.stringify(data));
  } catch (err) {
    console.error("Error saving OTP:", err);
  }
}

export function verifyOTP(code: string): boolean {
  if (!fs.existsSync(OTP_FILE)) return false;
  
  try {
    const data: OTPData = JSON.parse(fs.readFileSync(OTP_FILE, 'utf8'));
    if (Date.now() > data.expiresAt) return false;
    // Simple check
    return String(data.code).trim() === String(code).trim();
  } catch (e) {
    console.error("Error verifying OTP:", e);
    return false;
  }
}