const User = require("../models/User");
const nodemailer = require("nodemailer");
const Myusername = require("../config/keys").SendGridUsername;
const Mypassword = require("../config/keys").SendGridPassword;
const webpush = require('web-push');


module.exports.getEmergency = (req, res) => {
  res.render("emergency");
};


module.exports.postEmergency = (req, res) => {

  // We have the req.user
  console.log(req.user);
  // We have the req.body
  console.log(req.body);

  function getSubscriptionsFromDatabase(){
    let subscription_array = []
    emergencyContact.forEach((element) => {
      // finding if the emergency contact is in the database
      User.findOne({email:element.contactemail}).then(user =>{
        subscription_array.push(user.pushSubscription)
      })
      .catch(err => {
        return;
      })
    })
    console.log(subscription_array);
    return subscription_array;
  }
  const triggerPushMsg = function(subscription,dataToSend){
    return webpush.sendNotification(subscription,dataToSend)
    .catch((err) => {
      if (err.statusCode === 410) {
        console.log("Error 410")
      } else {
        console.log('Subscription is no longer valid: ', err);
      }
    });
  }

  const smtpTransport = nodemailer.createTransport({
    service: 'gmail',
    auth: {
        user: Myusername,
        pass: Mypassword
    }
});


  const { contact, latitude, longitude } = req.body;

  const emergencyContact = req.user.emergencyContact || req.session.user.emergencyContact;

  emergencyContact.forEach((element) => {

    const mailOptions = {
      to: element.contactemail,
      from: 'thesarthakarora@gmail.com',
      subject: 'Emergency  for '+ req.user.name,
      text: "Hey " + element.contactname + " there is an emergency!!!!, Please help "+ req.user.name + ". The Google maps link to reach him is https://www.google.com/maps?daddr="+ latitude +"," + longitude
  };
  smtpTransport.sendMail(mailOptions);
  console.log("mail sent")

  });


  const link = "https://api.whatsapp.com/send?phone=91" + contact + "&text=Pleasehelpme!https://thesafeplusapp.herokuapp.com/mylocation";

  return getSubscriptionsFromDatabase()
  .then((subscription_array) => {
    const payload = JSON.stringify({ title:`${req.user.name} needs your help!`,link:`${link}`})
    const selfData = JSON.stringify({title: "Unable to send push notifications to your contact",link:"https://thesafeplus.herokuapp.com/dashboard"})
    let promiseChain = Promise.resolve();
    if(subscription_array.length > 0){
      subscription_array.forEach((subscription) => {
        promiseChain = promiseChain.then(() => {
          triggerPushMsg(req.user.pushSubscription,selfData)
          return triggerPushMsg(subscription,payload);
        });
      })
    }
    else {
        return triggerPushMsg(req.user.pushSubscription,selfData)
    }
  }).then(() => {
    console.log("Some notification was sent")
    res.render(res.render('LocationShare',{link,contact}))
  })
  .catch(function(err) {
    res.status(500);
    res.setHeader('Content-Type', 'application/json');
    res.send(JSON.stringify({
      error: {
        id: 'unable-to-send-messages',
        message: `We were unable to send messages to all subscriptions : ` +
          `'${err.message}'`
      }
    }));
  })

  // const link = "https://api.whatsapp.com/send?phone=91" + contact + "&text=Pleasehelpme!/mylocation";


};