var express = require('express')
var session = require('express-session')
var app = express()
var r = require('request')

// By default cookies are disabled, switch it on
var request = r.defaults( { jar:true } )

app.use(session({ secret: 'keyboard cat',saveUninitialized : false, resave : false, cookie: { maxAge: 60000 }}))

app.get('/', function(req, res, next) {
  if(!req.session.views) {
    req.session.views = 1
    console.log('first timer : '+ req.session.views)
    res.end('first timer')
  } else {
    req.session.views++
    console.log('subsequent views: ' + req.session.views)
    req.session.extra = "some extra data"

    // While sessions with memoryStore may work fine with multiple requests/redirects, external
    // stores can cause race conditions - between next client request and the store, depending
    // on who runs faster. So save the session explicitly, prior to the response/redirect.
    req.session.save(function(err) {
      if(err) {
        res.end('session save error: ' + err)
        return
      }
      res.redirect('/admin')
    })
  }
})

app.get('/admin', function(req, res, next) {
  console.log(`in redirected route, views:  ${req.session.views} and extra: ${req.session.extra}`)
  res.end('redirected response')
})

app.listen(8000, () => {
  request.get('http://localhost:8000', (err,res,body) => {
    console.log(`first response : ${body}`)
    request.get('http://localhost:8000', (err,res,body) => {
      console.log(`second response : ${body}`)
    })
  })
})