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


// SETTINGS WebPush Configuration
const webpush = require('web-push');

const publicVapidKey = process.env.PUBLIC_VAPI_KEY;
const privateVapidKey = process.env.PRIVATE_VAPI_KEY;
webpush.setVapidDetails('mailto:' + process.env.EMAIL_FROM, publicVapidKey, privateVapidKey);

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

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

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

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

var { Todo } = require('../models/todo');

const _ = require('lodash');

const { ObjectID } = require('mongodb');


router.post('/', authenticate, (req, res) => {

  var body = _.pick(req.body, tools.allfieldTodoWithId());
  tools.mylogshow('INPUT', body);
  var todo = new Todo(body);

  // todo.expiring_at = new Date(todo.expiring_at);

  tools.mylog('ID :', todo._id, todo.descr, todo.userId, req.user._id);

  if (!('descr' in req.body)) {
    return res.status(400).send({ code: server_constants.RIS_CODE_LOGIN_ERR_GENERIC });
  }

  if (String(todo.userId) !== String(req.user._id)) {
    // I'm trying to write something not mine!
    tools.mylog('todo.userId = ', todo.userId, 'req.user._id', req.user._id)
    return res.status(404).send({ code: server_constants.RIS_CODE_TODO_CREATING_NOTMYUSER });
  }

  tools.mylog('TODO POST :', todo.descr, todo._id);

  todo.modified = false;
  if (!todo.descr) {
    console.log('RECORD NON VALIDO !?', req.body)
  }

  todo.save().then((writeresult) => {
    let idobj = writeresult._id;
    Todo.findById(idobj)
      .then(record => {
        tools.mylog('REC SAVED :', record.descr);

        sendNotificationToUser(todo.userId, 'Todo: ' + record.descr, record.descr, '/todo/' + todo.category, 'todo')
          .then(ris => {
            if (ris) {
              res.send({ record });
            } else {
              // already sent the error on calling sendNotificationToUser
            }
          })
      })
  }).catch((e) => {
    console.log('ERRORE in TODO POST', e.message);
    res.status(400).send(e);
  });
});


function sendNotificationToUser(userId, title, content, openUrl, tag) {

  const payload = {
    title: title,
    message: content,
    url: openUrl,
    tag,
    // ttl: req.body.ttl,
    // icon: req.body.icon,
    // image: req.body.image,
    // badge: req.body.badge,
    // tag: req.body.tag
  };

  return Subscription.find({ userId }, (err, subscriptions) => {
    if (err) {
      console.error(`Error occurred while getting subscriptions`);
      res.status(500).json({
        error: 'Technical error occurred'
      });
      return false;
    } else {
      let parallelSubscriptionCalls = subscriptions.map((subscription) => {
        return new Promise((resolve, reject) => {
          const pushSubscription = {
            endpoint: subscription.endpoint,
            keys: {
              p256dh: subscription.keys.p256dh,
              auth: subscription.keys.auth
            }
          };

          const pushPayload = JSON.stringify(payload);
          const pushOptions = {
            vapidDetails: {
              subject: process.env.URLBASE_APP1,
              privateKey: process.env.PRIVATE_VAPI_KEY,
              publicKey: process.env.PUBLIC_VAPI_KEY,
            },
            TTL: payload.ttl,
            headers: {}
          };

          // console.log('pushSubscription', pushSubscription);
          // console.log('pushOptions', pushOptions);
          // console.log('pushPayload', pushPayload);

          webpush.sendNotification(
            pushSubscription,
            pushPayload,
            pushOptions
          ).then((value) => {
            resolve({
              status: true,
              endpoint: subscription.endpoint,
              data: value
            });
          }).catch((err) => {
            reject({
              status: false,
              endpoint: subscription.endpoint,
              data: err
            });
          });
        }).catch(error => {
          console.log('ERROR: sendNotificationToUser', error.data)
        });
      });
      // q.allSettled(parallelSubscriptionCalls).then((pushResults) => {
      //   console.info(pushResults);
      // });
      // res.json({
      //   data: 'Push triggered'
      // });
      return true;
    }
  });

}

router.patch('/:id', authenticate, (req, res) => {
  var id = req.params.id;
  var body = _.pick(req.body, tools.allfieldTodo());

  tools.mylogshow('PATCH TODO: ', id)

  if (!ObjectID.isValid(id)) {
    tools.mylog('ERROR: id not VALID', id);
    return res.status(404).send();
  }


  Todo.findByIdAndUpdate(id, { $set: body }, { new: true }).then((todo) => {
    tools.mylogshow(' TODO TO MODIFY: ', todo.descr, todo.expiring_at);
    if (!todo) {
      return res.status(404).send();
    }

    if (todo.userId !== String(req.user._id)) {
      // I'm trying to write something not mine!
      return res.status(404).send({ code: server_constants.RIS_CODE_TODO_CREATING_NOTMYUSER });
    }

    todo.modified = false;

    tools.mylog('PATCH ', todo.descr, todo._id);

    res.send({ todo });
  }).catch((e) => {
    tools.mylogserr('Error patch TODO: ', e);
    res.status(400).send();
  })
});


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

  tools.mylog('GET : ', req.params);

  if (!ObjectID.isValid(userId)) {
    return res.status(404).send();
  }

  if (userId !== String(req.user._id)) {
    // I'm trying to write something not mine!
    return res.status(404).send({ code: server_constants.RIS_CODE_TODO_CREATING_NOTMYUSER });
  }

  // Extract all the todos of the userId only
  Todo.findAllByUserId(userId).then((todos) => {

    tools.mylog('todos', todos.length);

    res.send({ todos: todos });
  }).catch((e) => {
    console.log(e);
    res.status(400).send(e);
  });

});

router.delete('/:id', authenticate, (req, res) => {
  var id = req.params.id;

  if (!ObjectID.isValid(id)) {
    return res.status(404).send();
  }

  Todo.findByIdAndRemove(id).then((todo) => {
    if (!todo) {
      return res.status(404).send();
    }

    tools.mylog('DELETED ', todo.descr, todo._id);

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


module.exports = router;