var express = require('express');
var alexa = require('alexa-app');

var bodyParser = require('body-parser');

const dbURL = 'mongodb://localhost:27017/tellall';
const PORT = 5000;


var MongoClient = require ('mongodb').MongoClient;
var ObjectID = require ('mongodb').ObjectID;

const router = express.Router ();

router.get ('/intents', async (req, res, next) => {
  try {
    const id = req.params.id;

    db.collection ('intent_list').find({}).toArray((err,result)=>{
      if (err) throw err;
      res.json(result);
    });
    
  } catch (e) {
    console.log ('error:', e);
    next (e);
  }
});

router.get ('/deleteIntent/:id', async (req, res, next) => {
  try {
    let id = req.params.id;
    let result = db.collection('intent_list').remove({_id: ObjectID(id)},(err,result)=>{
      if (err) throw err;
      res.json(result);
    });
  } catch (e) {
    console.log ('error:', e);
    next (e);
  }
});

router.post ('/updateIntent/:id', async (req, res, next) => {
  try {
    let id = req.params.id;
    let intent = req.body;
    delete intent._id;
    let result = db.collection('intent_list').update({_id: ObjectID(id)}, intent,{upsert:true}, (err, result)=>{
      if (err) throw(err);
      res.json(result);
    });
  } catch (e) {
    console.log ('error:', e);
    next (e);
  }
});




var app = express();

// ALWAYS setup the alexa app and attach it to express before anything else.
var alexaApp = new alexa.app('step3');

alexaApp.express({
  expressApp: app,

  // verifies requests come from amazon alexa. Must be enabled for production.
  // You can disable this if you're running a dev environment and want to POST
  // things to test behavior. enabled by default.
  checkCert: false,

  // sets up a GET route when set to true. This is handy for testing in
  // development, but not recommended for production. disabled by default
  debug: true
});

// now POST calls to /test in express will be handled by the app.request() function

// from here on you can setup any other express routes or middlewares as normal
alexaApp.launch(function(request, response) {
  response.say("You launched Saburly app!");
});

alexaApp.request = (jsonRequest) => {
  const alexaRequest = new alexa.request(jsonRequest);
  if (alexaRequest.type() === "IntentRequest") {
    const intent = db.collection('intent_list').findOne({
      name: alexaRequest.data.request.intent.name
    });
    if (intent) {
      const response = new alexa.response(alexaRequest.getSession());
      return response.say(intent.answer);
    }
  }
};

app.use (function (req, res, next) {
  res.header ('Access-Control-Allow-Origin', '*');
  res.header (
    'Access-Control-Allow-Headers',
    'Origin, Content-Type'
  );
  res.header ('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
  res.header ('Access-Control-Allow-Credentials', 'true');
  next ();
});

app.use (bodyParser.json ());
app.use ('/', router);


MongoClient.connect (dbURL).then (database => {
  db = database;
  db.collection ('intent_list');
  app.listen (PORT, () =>
    console.log ('Express server running on port ' + PORT)
  );
});