const loginUsers = (req, res, next)=>{

  const loginKeys = Object.keys(req.body)
  const required = ['email', 'password'];
  const verifyRequired = required.every((key)=>{
    return loginKeys.includes(key);
  })

  if(!verifyRequired) return res.status(422).send({error: "Please fill in all required fields."});

  if(req.body.email.length === 0) return res.status(422).send({error: "Please type in your email."});

  if(req.body.password.length === 0) return res.status(422).send({error: "Please type in your password."});

  return passport.authenticate('local', function(err, passportUser){

    try{
      if(err)
        throw new Error(err)

      if(passportUser){
        req.login(passportUser, function(err){
          if(err) {
            return res.status(422).send({errors: 'Unable to create session'})
          }

          return res.json(passportUser)
        })
      }
      else{
        return res.status(422).send({errors: 'Something wen wrong'})
      }
    }catch(e){
      const msg = e.message.split(":").pop().trim()
      return res.status(422).send({errors: msg})
    }

  })(req, res, next)

};