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var express = require('express');
var app = express();
const uuidV4 = require('uuid/v4');
var nodemailer = require('nodemailer');
pendingRegistrations = {
  ABC: {
    user: "hans",
    email: "req.email",
    expiryTime: new Date(new Date().getTime() + 1000*60*5)
  }
}

app.get('/', function (req, res) {
  let page = '<!DOCTYPE html>  <html>  <body>  Name: <input type="text" id="name" value="daniel"><br>  Email: <input type="text" id="email" value="daniel.wenzel@campus.tu-berlin.de"><br><br>  <button onclick="myFunction()">Send</button>  <script>  function myFunction() {    window.location.href="/register/"+document.getElementById("name").value+"/"+document.getElementById("email").value}  </script>  </body></html>'

   res.send(page)
})

app.get('/register/:user/:email', (req, res) => {
  console.log("register",req.params)

  let randomID = uuidV4();

  pendingRegistrations[randomID] = {
    user: req.params.user,
    email: req.params.email,
    expiryTime: new Date(new Date().getTime() + 1000*60*5)
  }

  transporter.sendMail(generateMail(req.params.user, req.params.email, "http://localhost:8081/validate/"+randomID), function(error, info){
      if(error){
          console.log(error);
          return res.send(error)
      }
      res.send("link send successfully")
  });
  //res.send("http://localhost:8081/validate/"+randomID)
})

app.get('/validate/:validationID', (req, res) => {
  console.log("validate",req.params)
  if (req.params.validationID in pendingRegistrations) {
    let data = pendingRegistrations[req.params.validationID]
    delete pendingRegistrations[req.params.validationID]
    if (data.expiryTime.getTime() - new Date().getTime() > 0) {
      res.send(`hi ${data.user}, your email address was validated successfully`)
    }
    else res.send("error link expired")
  }
  else {
    res.send("Invalid validationID")
  }
})

var server = app.listen(8081, function () {
   var host = server.address().address
   var port = server.address().port

   console.log("Example app listening at http://%s:%s", host, port)
})

var transporterObjectConfig = {
  host: "exchange.tu-berlin.de",
  port: "587",
  secure: false,
  requireTLS: true,
  auth: {
    user: EMAIL (mit win),
    pass: PASSWORD
  }
};
var transporter = nodemailer.createTransport(transporterObjectConfig)


function generateMail(user, address, link) {
  let text = `Hi ${user}, thanks for registering at our awesome service. here is your activation line: ${link}`
  return {
      from: '"Daniel Wenzel" <daniel.wenzel@campus.tu-berlin.com>', // sender address
      to: address, // list of receivers
      subject: 'Hello here is your activation link', // Subject line
      text: text, // plaintext body
      html: text // html body
  };
}