Cocktail Machine with Alexa and PHPoC

'use strict';

var mqtt = require('mqtt');

// --------------- Helpers that build all of the responses -----------------------

function buildSpeechletResponse(title, output, repromptText, shouldEndSession) {
    return {
        outputSpeech: {
            type: 'PlainText',
            text: output,
        },
        card: {
            type: 'Simple',
            title: "SessionSpeechlet - " + title,
            content: "SessionSpeechlet - " + output,
        },
        reprompt: {
            outputSpeech: {
                type: 'PlainText',
                text: repromptText,
            },
        },
        shouldEndSession: shouldEndSession
    };
}

function buildResponse(sessionAttributes, speechletResponse) {
    return {
        version: '1.0',
        sessionAttributes,
        response: speechletResponse,
    };
}

// --------------- Functions that control the skill's behavior -----------------------

function getWelcomeResponse(callback) {
    // If we wanted to initialize the session to have some attributes we could add those here.
    const sessionAttributes = {};
    const cardTitle = 'Welcome';
    const speechOutput = "Welcome to P H P o C. How can I help you?"
    // If the user either does not reply to the welcome message or says something that is not
    // understood, they will be prompted again with this text.
    const repromptText = "How can I help you?";
    const shouldEndSession = false;

    callback(sessionAttributes,
        buildSpeechletResponse(cardTitle, speechOutput, repromptText, shouldEndSession));
}

function handleSessionEndRequest(callback) {
    const cardTitle = 'Session Ended';
    const speechOutput = 'Thank you for trying the Alexa Skills Kit sample. Have a nice day!';
    // Setting this to true ends the session and exits the skill.
    const shouldEndSession = true;

    callback({}, buildSpeechletResponse(cardTitle, speechOutput, null, shouldEndSession));
}

function createAttributes(cocktail) {
    return {
        cocktail: cocktail
    };
}

/**
 * Send data to mqtt and prepares the speech to reply to the user.
 */
function cocktailInSession(intent, session, callback) {
	const cardTitle = intent.name;
	const drinkNameRequest = intent.slots.drinkName;
	let repromptText = '';
	let sessionAttributes = {};
	const shouldEndSession = true;
	let speechOutput = "";

	var drinkName = "";
	var requestName = "";

	if(drinkNameRequest) 
	{
		requestName = drinkNameRequest.value;
		console.log("cocktail: " + requestName);

		drinkName = requestName.toUpperCase();
		drinkName = drinkName.replace(/ /g, "_");
		
		switch(drinkName)
		{
			case "SUMMER_RAIN":
			case "SCREW_DRIVER":
			case "BLACK_RUSSIAN":
			case "BLACK_RUSSIAN_2":
			case "SWEET_MARTINI":
			case "MARTINI":
				break;

			default:
				drinkName = "";
		}
	}
	
	if(drinkName !== "")
	{
		speechOutput = "Ok, I will tell cocktail machine make " + requestName + " for you";

		//Update 
		var mqttpromise = new Promise( function(resolve,reject){
			var client = mqtt.connect({port:1883,host:'iot.eclipse.org'})

			client.on('connect', function() { // When connected
				// publish a message to any mqtt topic
				client.publish('alexa/phpoc/cocktail', drinkName)
				client.end()
				resolve('Done Sending');
			});
		});
		mqttpromise.then(
			function(data) {
				console.log('Function called succesfully:', data);
				sessionAttributes = createAttributes(data);
				repromptText = speechOutput;
				callback(sessionAttributes, buildSpeechletResponse(cardTitle, speechOutput, repromptText, shouldEndSession));
			},
			function(err) {
				console.log('An error occurred:', err);
			}
		);
	}else{
		speechOutput = "Please try again";
		repromptText = "Please try again";
		
		callback(sessionAttributes,buildSpeechletResponse(cardTitle, speechOutput, repromptText, shouldEndSession));
	}
}

// --------------- Events -----------------------

/**
 * Called when the session starts.
 */
function onSessionStarted(sessionStartedRequest, session) {
    console.log("onSessionStarted requestId=${sessionStartedRequest.requestId}, sessionId=${session.sessionId}");
}

/**
 * Called when the user launches the skill without specifying what they want.
 */
function onLaunch(launchRequest, session, callback) {
    console.log("onLaunch requestId=${launchRequest.requestId}, sessionId=${session.sessionId}");

    // Dispatch to your skill's launch.
    getWelcomeResponse(callback);
}

/**
 * Called when the user specifies an intent for this skill.
 */
function onIntent(intentRequest, session, callback) {
    console.log("onIntent requestId=${intentRequest.requestId}, sessionId=${session.sessionId}");

    const intent = intentRequest.intent;
    const intentName = intentRequest.intent.name;

    // Dispatch to your skill's intent handlers
    if (intentName === 'cocktail') {
        cocktailInSession(intent, session, callback);
    } else if (intentName === 'AMAZON.HelpIntent') {
        getWelcomeResponse(callback);
    } else if (intentName === 'AMAZON.StopIntent' || intentName === 'AMAZON.CancelIntent') {
        handleSessionEndRequest(callback);
    } else {
        throw new Error('Invalid intent');
    }
}

/**
 * Called when the user ends the session.
 * Is not called when the skill returns shouldEndSession=true.
 */
function onSessionEnded(sessionEndedRequest, session) {
    console.log("onSessionEnded requestId=${sessionEndedRequest.requestId}, sessionId=${session.sessionId}");
    // Add cleanup logic here
}


// --------------- Main handler -----------------------

// Route the incoming request based on type (LaunchRequest, IntentRequest,
// etc.) The JSON body of the request is provided in the event parameter.
exports.handler = (event, context) => {
    try {
        console.log("event.session.application.applicationId=${event.session.application.applicationId}");

        /**
         * Uncomment this if statement and populate with your skill's application ID to
         * prevent someone else from configuring a skill that sends requests to this function.
         */
        /*
        if (event.session.application.applicationId !== 'amzn1.echo-sdk-ams.app.[unique-value-here]') {
             context.fail("Invalid Application ID");
        }
        */

        if (event.session.new) {
            onSessionStarted({ requestId: event.request.requestId }, event.session);
        }

        if (event.request.type === 'LaunchRequest') {
            onLaunch(event.request,
                event.session,
                function callback(sessionAttributes, speechletResponse) {
					context.succeed(buildResponse(sessionAttributes, speechletResponse));
				});
        } else if (event.request.type === 'IntentRequest') {
            onIntent(event.request,
                event.session,
                function callback(sessionAttributes, speechletResponse) {
					context.succeed(buildResponse(sessionAttributes, speechletResponse));
				});
        } else if (event.request.type === 'SessionEndedRequest') {
            onSessionEnded(event.request, event.session);
            context.succeed();
        }
    } catch (e) {
        context.fail("Exception: " + e);
    }
};