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

var handlers = {};

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 = {};

        //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');
          };
        });

        //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');
      });
  },
};