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const twilio = require('twilio');

async function sendOrVerifyOTP(phoneNumber, type, otpCode = null) {
  const accountSid = process.env.TWILIO_ACCOUNT_SID;
  const authToken = process.env.TWILIO_AUTH_TOKEN;
  const client = twilio(accountSid, authToken);

  try {
    switch (type) {
      case 'send':
        const verification = await client.verify.services(process.env.TWILIO_SERVICE_ID)
          .verifications
          .create({ to: phoneNumber, channel: 'sms' });
        return verification;

      case 'verify':
        if (!otpCode) {
          throw new Error('OTP Code is required for verification');
        }
        const verificationCheck = await client.verify.services(process.env.TWILIO_SERVICE_ID)
          .verificationChecks
          .create({ to: phoneNumber, code: otpCode });
        return verificationCheck;

      default:
        throw new Error('Invalid action. Only "send" or "verify" are allowed');
    }
  } catch (error) {
    console.error(`Error in Twilio service: ${error.message}`);
    throw error;
  }
}

module.exports = sendOrVerifyOTP;