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

const router = express.Router ();

var app = express ();

//User data for sending message, this is skill-related and will be in some skill container
var Name = null; 
var Email = null; 
var Message = null;
var State = 0; // states should be defined in seperate file. (Not sending message, Waiting for name, Waiting for email, Waiting for message)
//For now :
// 0 : Not sending Message
// 1 : Waiting for name
// 2 : Waiting for email
// 3 : Waiting for message

// ALWAYS setup the alexa app and attach it to express before anything else.
var alexaApp = new alexa.app ('saburly'); // this means we still work with one skill

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 nor

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

var updateIntentsJSON = function () {
  databaseHelper
    .loadSkill (config.SKILL_DB_ID)
    .then (skill => {
      skill.intents.map (intent => {
        
        alexaApp.intent (
          intent.intentName,
          {
            slots: [],
            utterances: intent.questions,
          },
          function (request, response) {
            return response.say (intent.answer).shouldEndSession(false);
          }
        );
      });
      
      alexaApp.launch ((request, response) => {
        return response.say (skill.invocationAnswer).shouldEndSession(false);
      });

      alexaApp.intent('EmailIntentLaunch',{
          slots:[],
          utterances: [
            'I want to send a message',
            'I would like to send a message',
            'I would like to leave a message',
            'Leave a message'
          ]
        },
        function(request,response){
          Name = null;
          Email = null;
          Message = null;
          State = 1;

          return response.say('Ok. What is your name').shouldEndSession(false);
        }
      );

      //TODO : Watch out for this intent. It will make trouble with other regular intents
      //if other intents have utterance with just one slot like {Data}
      //It should be taken care somwhere before this, to check if Email Intent is invoked 
      //This is problem only if we introduce slot options for regular intents for users
      alexaApp.intent('EmailIntent',{
        slots:{
          'Name':'AMAZON.US_FIRST_NAME',
          'Email' : 'AMAZON.LITERAL',
          'Message': 'AMAZON.LITERAL',
          'Data': 'AMAZON.LITERAL'
        },
        utterances: [
          'My name is {-|Name}',
          'I am {-|Name}',
          '{dawdw at dwd wdw|Data}',
          'My email is {wadwwdw at wadwwd wdw|Email}',
          'Send replay to {fkofkeofe at dppfam wd|Email}',
          'My message is {Quick brown fox jumps over lazy dog|Message}'
        ]
      },
      function(request,response){
	let Data = undefined;
	try{if (!Name) Name = request.slot('Name');}catch(e){console.log('Error. No name slot ');Name=undefined;}
        try{if (!Email) Email = request.slot('Email');}catch(e){console.log('Error. No Email slot');Email=undefined;}
        try{if (!Message) Message = request.slot('Message');}catch(e){console.log('Error. No Message slot');Message=undefined;}
        try{Data = request.slot('Data');}catch(e){console.log('Error. No Data slot');Data=undefined;}
	console.log('State : ' + State);

        //TODO : Responses could be configurable for each skill ?
        
        if (State === 1){
          //Was waiting for name, so if Name is null, name is probably in Data
          if ((!Name && Data) || Name){
            //got the name, let's continue for the email
	    if (!Name) Name = Data;
            State = 2;
            return response.say('Ok ' + Name + '. What is your email ?').shouldEndSession(false);
          }else{
            //Something is wrong, ask for name again
            return response.say('Sorry, I didnt understand your name. Can you say it again ?').shouldEndSession(false);            
          }
        }else if (State === 2){
          //was waiting for email, so if Email is null, email is probably in Data
          if ((!Email && Data) || Email){
            //Got the email, first verify email and than continue to message
	    if (!Email) Email = Data;
            //TODO : verify email
            State = 3;
            return response.say('Great. Whats the message ?').shouldEndSession(false);
          }else{
            //Something is wrong, ask for the email again
            return response.say('Sorry, I didnt understan you email. Can you say it again ?').shouldEndSession(false);
          }
        }else if (State === 3){
          //Was waiting for message, so if Message is null, message is probably in Data
          if ((!Message && Data) || Message){
            //Ok, we got all informations. Exit email intent
	    if (!Message) Message=Data;
            State = 0;
            //TODO : Send email
	    console.log('Name : ' + Name + ' | Email : ' + Email + ' | Message :  ' + Message);
            return response.say('Message sent. Someone will contact you ASAP');
          }else{
	    //Something is wrong, ask for the message again
 	    return response.say('Sorry, I didnt understand your message. Can you say it again ?').shouldEndSession(false);
	  }
        }else{
	  console.log('State strange ! ' + State);
	}

      }
    );

    })
    .catch (err => {
      console.log (err);
      alexaApp.launch ((request, response) => {
        return response.say ('Sorry, there was no skill with that name');
      });
    });
};

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

  if (id.length !== 24) {
    res.json ([]);
  } else {
    databaseHelper
      .getSkill (id)
      .then (result => {
        res.json (result);
      })
      .catch (err => {
        res.json ([]);
      });
  }
});

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

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 === 200 || amazonResult === 202) {
          //Skill uploaded, it's ok to update databaseI
          databaseHelper
            .updateSkill (id, skill)
            .then (result => {
              res.json ({result: 0, message: 'ok'});
              updateIntentsJSON ();
            })
            .catch (e => {
              res.json ({result: -1, message: 'error'});
            });
        }else{
	  res.json({result: -1, message: 'amazon error : ' + amazonResult});
	}
      }).catch(e=>{
        res.json ({result: -1, message: e});
      });
    }else{
      databaseHelper
      .updateSkill (id, skill)
      .then (result => {
        res.json ({result: 0, message: 'ok'});
        updateIntentsJSON ();
      })
      .catch (e => {
        res.json ({result: -1, message: 'error'});
      });
    }

  } 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);
      updateIntentsJSON ();
      databaseHelper.loadTokens ();
    });
  })
  .catch (e => {
    console.log ('error : ' + e);
  });