const ACI = require("amazon-cognito-identity-js");
const AWS = require("aws-sdk");

exports.handler = (event, context, callback) => {

    var authenticationData = {
        Username : event.username ? event.username : "",
        Password : event.password ? event.password : "",
    };
    var authenticationDetails = new ACI.AuthenticationDetails(authenticationData);

    var poolData = {
        UserPoolId : 'eu-west-2_hwI4lvY1T', // Your user pool id here
        ClientId : '4e20kvmotvvbgc79srv3u682fn' // Your client id here
    };
    var userPool = new ACI.CognitoUserPool(poolData);

    var userData = {
        Username : event.username ? event.username : "",
        Pool : userPool
    };
    var cognitoUser = new ACI.CognitoUser(userData);

    cognitoUser.authenticateUser(authenticationDetails, {
        onSuccess: function (result) {
            var accessToken = result.getIdToken().getJwtToken();

            callback(accessToken);
return;
            var attributeList = [];
            var attribute = {
                Name : 'custom:x-api-key',
                Value : 'DYGbjx1IEc4xAwK4oOQN959SfrJDxkXKaFvjBO1S'
            };
            var attribute = new ACI.CognitoUserAttribute(attribute);
            attributeList.push(attribute);

            cognitoUser.updateAttributes(attributeList, function(err, result) {
                if (err) {
                    console.log("ERR" + err.message || JSON.stringify(err));
                    return;
                }
                console.log('call result: ' + result);
            });

            return;

            // Initialize the Amazon Cognito credentials provider
            AWS.config.region = 'eu-west-2'; // Region
            AWS.config.credentials = new AWS.CognitoIdentityCredentials({
                IdentityPoolId: 'eu-west-2:2bc384fb-f85a-46bd-81ee-b3b6d86834bc',
                Logins: {
                    'cognito-idp.eu-west-2.amazonaws.com/eu-west-2_hwI4lvY1T': accessToken
                }
            });

            AWS.config.getCredentials((error) => {
                if (error) {
                    callback("Error: " + error.message || JSON.stringify(error), null);
                } else {
                    callback(null, AWS.config.credentials.data);
                }
            });

        },

        onFailure: function(err) {
            callback("Error: " + err.message || JSON.stringify(err), null);
        },

    });

};

exports.handler({username: "xAdlerTest2", password: "password"}, {}, callbacks);

function callbacks(s, a) {
    console.log(s || a);
}