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///Genarate token 
/// ex: https://twiliochatroomaccesstoken-4974.twil.io/test_token?identity=Tompei

exports.handler = function(context, event, callback) {
  const AccessToken = require('twilio').jwt.AccessToken;
  const VoiceGrant = AccessToken.VoiceGrant;

  const twilioAccountSid = context.ACCOUNT_SID;
  const twilioApiKey = context.API_KEY_SID;
  const twilioApiSecret = context.API_SECRET;

  const outgoingApplicationSid = context.APP_SID;
  const pushCredentialSid = context.PUSH_CREDENTIAL_SID;
  const identity = event.identity || 'alice';

  const voiceGrant = new VoiceGrant({
    outgoingApplicationSid: outgoingApplicationSid,
    pushCredentialSid: pushCredentialSid
  });

  const token = new AccessToken(twilioAccountSid, twilioApiKey, twilioApiSecret, {ttl: 20157});
  token.addGrant(voiceGrant);
  token.identity = identity;

  callback(null, token.toJwt());
};


/// makeCall

const callerNumber = '1234567890';
const callerId = 'client:Tom';

exports.handler = function(context, event, callback) {
  const twiml = new Twilio.twiml.VoiceResponse();

  var to =  (event.to) ? event.to : event.To;
  if (!to) {
    twiml.say('Congratulations! You have made your first call! Good bye.');
  } else if (isNumber(to)) {
    const dial = twiml.dial({callerId : callerNumber});
    dial.number(to);
  } else {
    const dial = twiml.dial({callerId : callerId});
    dial.client(to);
  }

  callback(null, twiml);
};

function isNumber(to) {
  if(to.length == 1) {
    if(!isNaN(to)) {
      console.log("It is a 1 digit long number" + to);
      return true;
    }
  } else if(String(to).charAt(0) == '+') {
    number = to.substring(1);
    if(!isNaN(number)) {
      console.log("It is a number " + to);
      return true;
    };
  } else {
    if(!isNaN(to)) {
      console.log("It is a number " + to);
      return true;
    }
  }
  console.log("not a number");
  return false;
}