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

movies = {
  'comedy': ['Monty Python and the Holy Grail', 'Gentlemen Prefer Blondes', 'Some Like It Hot'],
  'action': ['Mad Max: Fury Road', 'Seven Samurai', 'The Terminator'],
  'sci-fi': ['Alien', 'Blade Runner', 'Doctor Strange'],
  'drama': ['12 Years a Slave', 'L.A. Confidential', 'Whiplash']
}

function getRandomInt(max) {
  return Math.floor(Math.random() * Math.floor(max));
}


exports.handler = (event, context, callback) => {
  console.log(event)
  const alexa = Alexa.handler(event, context, callback);
  alexa.appId = '<ID GOES HERE>'
  alexa.registerHandlers(handlers);
  alexa.execute();
};


const handlers = {
  'FindMovieIntent' : function() {
    const intentObj = this.event.request.intent;
    if (!intentObj.slots.genre.value) {
      this.emit(':tell', 'What genre?');
    } else {
      //this.emit(':tell', "Hold tight. I'm looking for a good " + genre + " movie for you.")
      genre = intentObj.slots.genre.value
      if (genre in movies) {
        candidates = movies[genre]
        if (candidates.length > 0) {
          suggestion = candidates[getRandomInt(candidates.length - 1)]
          this.emit(':tell', "How about \"" + suggestion + "\"?")
        } else {
          this.emit(':tell', "I don't know any " + genre + " movies yet")
        }
      } else {
        this.emit(':tell', "I don't know any " + genre + " movies yet")
      }
    }
  }
};