old-tellall/backend/models/alexa.js

var Alexa = require ('alexa-sdk');
const config = require ('../config/config');
var databaseHelper = require ('../helpers/database');
var emailHelper = require ('../helpers/email');
const constants = require ('../config/constants');

var handlers = {};
var destinationEmail;

module.exports = {
  run: function (req, res) {
    // Build the context manually, because Amazon Lambda is missing
    var context = {
      succeed: function (result) {
        console.log (result);
        res.json (result);
      },
      fail: function (error) {
        console.log (error);
        //We could send error json from here
      },
    };

    var alexa = Alexa.handler (req.body, context);
    alexa.appId = config.SKILL_ID;
    alexa.registerHandlers (handlers);
    alexa.execute ();
  },
  updateModel: function () {
    //Get info from database, and store it for faster response on intent
    databaseHelper
      .getSkill (config.SKILL_DB_ID)
      .then (activeSkill => {
        handlers = {};
        destinationEmail = activeSkill.contactEmail;

        //Handler for launch request
        handlers = {
          LaunchRequest: function () {
            this.response
              .speak (activeSkill.invocationAnswer)
              .listen (constants.voiceResponseStrings.GENERIC_CONTINUE); //Phrase from listen doesn't work !!!
            //TODO : Maybe to ask user does he want to hear possible intents
            //For this functionality, we need explanation text for each intent (Question)
            this.emit (':responseReady');
          },
        };

        //Handlers for user defined questions
        activeSkill.intents.map (intent => {
          handlers[intent.intentName] = function () {
            this.response
              .speak (intent.answer)
              .listen (constants.voiceResponseStrings.GENERIC_CONTINUE); //Phrase from listen doesn't work !!!
            this.emit (':responseReady');
          };
        });

        //Handler for sending message
        handlers.SendMessageIntent = function () {
          let intent = this.event.request.intent;

          console.log ('Dialog state : ' + this.event.request.dialogState);
          console.log (intent);
          //STARTED, IN_PROGRESS

          if (!intent.slots.Name.value) {
            //Name not defined yet, ask user for name
            const slotToElicit = 'Name';
            const speechOutput = 'What is your name';
            const repromptSpeech = speechOutput;
            this.emit (
              ':elicitSlot',
              slotToElicit,
              speechOutput,
              repromptSpeech
            );
          } else if (!intent.slots.Email.value) {
            //Name not defined yet, ask user for email
            const slotToElicit = 'Email';
            const speechOutput =
              'Ok ' + intent.slots.Name.value + '. What is your email';
            const repromptSpeech = speechOutput;
            this.emit (
              ':elicitSlot',
              slotToElicit,
              speechOutput,
              repromptSpeech
            );
          } else if (!intent.slots.Message.value) {
            intent.slots.Email.value = emailHelper.transformEmailFromAlexaResponse (
              intent.slots.Email.value
            );
            if (!emailHelper.isEmailValid (intent.slots.Email.value)) {
              //Email is not valid, ask again
              const slotToElicit = 'Email';
              const speechOutput =
                'Sorry, that was not valid email. What is your email';
              const repromptSpeech = speechOutput;
              this.emit (
                ':elicitSlot',
                slotToElicit,
                speechOutput,
                repromptSpeech,
                intent
              );
            } else {
              //Email is valid
              const slotToElicit = 'Message';
              const speechOutput = 'Great. What is your message';
              const repromptSpeech = speechOutput;
              this.emit (
                ':elicitSlot',
                slotToElicit,
                speechOutput,
                repromptSpeech
              );
            }
          } else {
            //all slots are filled
            console.log ('Name : ' + intent.slots.Name.value);
            console.log ('Email : ' + intent.slots.Email.value);
            console.log ('Message : ' + intent.slots.Message.value);
            emailHelper
              .sendEmal (
                intent.slots.Name.value,
                intent.slots.Email.value,
                intent.slots.Message.value,
                destinationEmail
              )
              .then (info => {
                console.log (info);
                this.response.speak (
                  'Ok. Message sent. Someone will contact you ASAP'
                );
                this.emit (':responseReady');
              })
              .catch (error => {
                console.log (error);
                this.response.speak (
                  'Sorry, there was a problem with sending message.'
                );
                this.emit (':responseReady');
              });
          }
        };

        //Default handlers for unknown questions and session close

        handlers.Unhandled = function () {
          this.response
            .speak (constants.voiceResponseStrings.QUESTION_NOT_FOUND)
            .listen (constants.voiceResponseStrings.GENERIC_CONTINUE);
        };

        handlers.SessionEndedRequest = function () {
          //We don't care for now
        };
      })
      .catch (e => {
        //Something is wrong, skill is not ready, use catch-all intent to inform user
        console.log ('Error. Skill doesnt exist');
      });
  },
};