const express = require('express');
const router = express.Router();

var { User } = require('../models/user');

var sendemail = require('../sendemail');

const tools = require('../tools/general');

var server_constants = require('../tools/server_constants');

const _ = require('lodash');

var reg = require('../reg/registration');

var { authenticate } = require('../middleware/authenticate');

var mongoose = require('mongoose');
const Subscription = mongoose.model('subscribers');

function existSubScribe(userId, access) {
  return Subscription.findOne({ userId, access })
    .then(itemsub => {
      return itemsub
    })
    .catch(err => {
      return null
    })

}

// POST /users
router.post('/', (req, res) => {
  tools.mylog("POST /users");
  var body = _.pick(req.body, ['email', 'password', 'username', 'idapp', 'keyappid', 'lang']);
  var user = new User(body);

  // tools.mylog("LANG PASSATO = " + user.lang, "IDAPP", user.idapp);

  user.linkreg = reg.getlinkregByEmail(body.email, body.username);
  user.verified_email = false;
  if (tools.testing()) {
    user.verified_email = true;
  }

  user.save().then(() => {
    User.findByUsername(user.username)
      .then((usertrovato) => {

        tools.mylog("TROVATO USERNAME ? ", user.username, usertrovato);
        if (usertrovato !== null) {
          return user.generateAuthToken(req);
        } else {
          res.status(11100).send();
          return 0;
        }
      }).then((token) => {
      // tools.mylog("passo il TOKEN: ", token);
      res.header('x-auth', token).send(user);

      // tools.mylog("LINKREG = " + user.linkreg);
      // Invia un'email all'utente
      // tools.mylog('process.env.TESTING_ON', process.env.TESTING_ON);
      if (!tools.testing()) {
        sendemail.sendEmail_Registration(res.locale, user.email, user.username, user.idapp, user.linkreg);
      }

    });
  }).catch((e) => {
    res.status(400).send(e);
  })
});

router.get('/:username', (req, res) => {
  var username = req.params.username;

  User.findByUsername(username).then((user) => {
    if (!user) {
      return res.status(404).send();
    }
    res.status(200).send();
  }).catch((e) => {
    res.status(400).send();
  });
});


router.post('/login', (req, res) => {
  var body = _.pick(req.body, ['username', 'password', 'idapp', 'keyappid', 'lang']);
  var user = new User(body);

  tools.mylog("LOGIN: username: " + user.username + " pwd = " + user.password);

  tools.mylog("user REC:", user);

  if (body.keyappid !== process.env.KEY_APP_ID)
    return res.status(400).send();


  User.findByCredentials(user.username, user.password)
    .then((user) => {
      tools.mylog("CREDENZIALI ! ");
      if (!user) {
        tools.mylogshow("NOT FOUND !");
        res.status(404).send({ code: server_constants.RIS_CODE_LOGIN_ERR });
      }
    })
    .then(user => {
      let mytoken = '';
      return user.generateAuthToken(req).then((token) => {
        var usertosend = User();
        usertosend.username = user.username;
        usertosend.email = user.email;
        usertosend.userId = user._id.toHexString();
        usertosend.verified_email = user.verified_email;

        // tools.mylog("user.verified_email:" + user.verified_email);
        tools.mylog("usertosend.userId", usertosend.userId);

        // tools.mylog("usertosend:");
        // tools.mylog(usertosend);
        return usertosend
      })
        .then((usertosend) => {
          const useragent = req.get('User-Agent');
          const access = 'auth ' + useragent;
          // if (usertosend.tokens.length > 0)
          //   access = usertosend.tokens[usertosend.tokens.length - 1].access;

          return existSubScribe(usertosend.userId, access)
            .then(subscribe => {
              if (subscribe === null) {
                // Doesn't exist, so save sub passed in INPUT
                let subscriptionModel = new Subscription(req.body.subs);
                subscriptionModel.userId = usertosend._id;
                subscriptionModel.access = access;

                return subscriptionModel.save((err, subscription) => {
                  if (err) {
                    console.error(`Error occurred while saving subscription. Err: ${err}`);
                    res.status(500).json({
                      error: 'Technical error occurred'
                    });
                  } else {
                    // Send 201 - resource created
                    // res.status(201).json({ data: 'Subscription saved.' });
                    // res.send({ data: 'Subscription saved.' });

                    tools.sendBackNotif(subscription, req.body.options)
                  }

                  return { usertosend }
                });
              } else {
                return { usertosend }
              }
            });
        })
        .then((usertosend) => {
          console.log('res', mytoken, usertosend);

          res.header('x-auth', mytoken).send({ usertosend, code: server_constants.RIS_CODE_OK });
          // tools.mylog("TROVATOOO!");

          tools.mylog('FINE LOGIN')
        });
    })
    .catch((e) => {
      tools.mylog("ERRORE IN LOGIN: " + e);
      res.status(400).send({ code: server_constants.RIS_CODE_LOGIN_ERR_GENERIC });
    });
});

router.delete('/me/token', authenticate, (req, res) => {
  tools.mylog("TOKENREM = " + req.token);
  req.user.removeToken(req.token).then(() => {
    res.status(200).send();
  }, () => {
    res.status(400).send();
  });
});

module.exports = router;