const AWS = require("aws-sdk");
const cognitoidentityserviceprovider = new AWS.CognitoIdentityServiceProvider();

const clientID1 = process.env.client_id;

function registerUser(client, password, username, email){
  var params = {
   ClientId: client, /* required */
   Password: password, /* required */
   Username: username, /* required */
   UserAttributes: [
     {
       Name: 'email',
       Value: email
     }
   ]
  };
  cognitoidentityserviceprovider.signUp(params, function(err, data) {
   if (err) console.log(err, err.stack); // an error occurred
   else{
    console.log(data);           // successful response
    return data;
   }
  });
}


function verifyInput(e){
 let data = {};
 try{
  data.password = e.password;
  data.username = e.username;
  data.email = e.email;
 } catch (e) {
   console.error(e);
   return false;
 }
 if (data.password === undefined) return false;
 if (data.username === undefined) return false;
 if (data.email === undefined) return false;
 return data;
}

exports.handler = (event, context, callback) => {
   let check = verifyInput(event);
   if (check === false) return callback(null, "Registration Failed");
   let data = registerUser(clientID1, event.password, event.username, event.email);
   callback(null, "Registration Successful");
};