var amazonHelper = require ('./helpers/amazon');
var databaseHelper = require ('./helpers/database');
const config = require ('./config/config');
const constants = require ('./config/constants');
require ('isomorphic-fetch');
var express = require ('express');
var alexa = require('./components/alexa');
var bodyParser = require ('body-parser');
var MongoClient = require ('mongodb').MongoClient;
var ObjectID = require ('mongodb').ObjectID;

const router = express.Router ();
var app = express ();

// ALWAYS setup the alexa app and attach it to express before anything else.
alexa.init(app);

// from here on you can setup any other express routes or middlewares as nor

app.set ('view engine', 'ejs');

/*
router.get ('/deleteSkill/:skillID', async (req, res, next) => {
  databaseHelper
    .deleteSkill (req.params.id)
    .then (result => {
      res.json (result);
    })
    .catch (err => {
      res.json (err);
    });
});
*/

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

  if (id.length !== constants.skillIDLength) {
    res.json ([]);
  } else {
    databaseHelper
      .getSkill (id)
      .then (result => {
        res.json (result);
      })
      .catch (err => {
        res.json ([]);
      });
  }
});

router.post ('/updateSkill/:id', async (req, res, next) => {
  let id = req.params.id;
  let dataFromWeb = JSON.stringify(req.body);
  let skill = JSON.parse(dataFromWeb);
  let updateOnAmazon = skill.updateOnAmazon;
  delete skill.updateOnAmazon;
  delete skill._id;
  console.log('id = ' + id);
  if (id !== '-1') {
    if (updateOnAmazon){
      amazonHelper.updateSkill(skill).then(amazonResult=>{
	    console.log('Amazon : ' + amazonResult);
        if (amazonResult === constants.amazonResultCodes.ok || amazonResult === constants.amazonResultCodes.accepted) {
          //Skill uploaded, it's ok to update databaseI
          databaseHelper
            .updateSkill (id, skill)
            .then (result => {
              res.json ({result: constants.apiResultCodes.ok, message: ''});
              alexa.updateIntentsJSON ();
            })
            .catch (e => {
              res.json ({result: constants.apiResultCodes.databaseError, message: ''});
            });
        }else{
	        res.json({result: constants.apiResultCodes.amazonError, message: amazonResult});
	      }
      }).catch(e=>{
        res.json ({result: constants.apiResultCodes.amazonError, message: 'unknown'});
      });
    }else{
      databaseHelper
      .updateSkill (id, skill)
      .then (result => {
        res.json ({result: constants.apiResultCodes.ok, message: ''});
        alexa.updateIntentsJSON ();
      })
      .catch (e => {
        res.json ({result: constants.apiResultCodes.databaseError, message: ''});
      });
    }

  } else {
    //no new skills for now
  }
});

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 (config.dbURL)
  .then (database => {
    databaseHelper.initModule (database);

    app.listen (config.PORT, () => {
      console.log ('Express server running on port ' + config.PORT);
      alexa.updateIntentsJSON ();
      databaseHelper.loadTokens ();
    });
  })
  .catch (e => {
    console.log ('error : ' + e);
  });