index.js

'use strict';

const Alexa = require('alexa-sdk');
const APP_ID = undefined;

// App model data:
// Exercise steps
const exerciseStore = require('exerciseStore');
// Collections of exercises that make up a routine
const routinesStore = require('routineStore');

// methods
const conversationHandler = require('conversationHandler');

// such as LIGHT, MEDIUM
let exerciseType = undefined; 
// current routine step index
let exerciseStep = 0; 

// Returns the current exercise State e.g. 'HEAL_LIFT_INIT'
function getExerciseState() {
  return routinesStore[exerciseType][exerciseStep];
}

function exerciseHandler() {
  let currExerciseState = getExerciseState(); 
  let responseData = exerciseStore[currExerciseState];
  if (responseData.type === 'text'){
    /*
      returns:
      {
        responseType: (string),
        text: (string) 
      }
    */
    return responseData.config;
  }
  if (responseData.type === 'syncMethod'){
    return exerciseMethods[responseData.config.method](responseData.config.params);
  }
}

const handlers = {
  'LaunchRequest': function () {
    resetExerciseStep();
    let initialResponse = conversationHandler('INIT');
    this.emit(initialResponse.responseType, initialResponse.text);
  },
  'lightIntent': function () {
    exerciseType = 'LIGHT';
    let responseData = exerciseHandler();
    this.emit(responseData.responseType, responseData.text);
  },
  'mediumIntent': function () {
    exerciseType = 'MEDIUM';
    this.emit(':ask', 'I am not able to train medium yet, please say light if you wish to do this exercise instead.');
  },
  'readyIntent': function () {
    incrementExerciseStep();
    let responseData = exerciseHandler();
    this.emit(responseData.responseType, responseData.text);
  },
  'repeatIntent': function () {
    // let incrementExerciseBy = this.event.request.intent.slots.number.value;
    let responseData = exerciseHandler();
    this.emit(responseData.responseType, responseData.text);
  },
  'repeatRoutineIntent': function () {
    resetExerciseStep();
    let responseData = exerciseHandler();
    this.emit(responseData.responseType, responseData.text);
  }
};

exports.handler = function (event, context, callback) {
  const alexa = Alexa.handler(event, context, callback);
  alexa.APP_ID = APP_ID;
  alexa.registerHandlers(handlers);
  alexa.execute();
};

// TODO export.
const exerciseMethods = {
  repeatedMiddleStep: function (params) {
    let { repetitions,
            initialInstruction,  
            instruction,
            finalInstruction,
            congratulate
    } = params;
    let output = initialInstruction;
    for (var i = 1; i < repetitions; i++) {
      if (i < repetitions - 1) {
        output += instruction;
      } else {
        output += finalInstruction;
        output += congratulate;
      }
    }
    return {
      responseType: params.responseType,
      text: output
    }
  },
}
    
function resetExerciseStep () {
  exerciseStep = 0;
}

function incrementExerciseStep () {
  exerciseStep ++;
}

export default index;