const express = require("express");
const router = express.Router();
const gravatar = require("gravatar");
const bcrypt = require("bcrypt");
const jwt = require("jsonwebtoken");
const keys = require("../../config/keys"); // sada smo pristupili tajni
const passport = require("passport");

// ucitaj validaciju inputa
const validateRegisterInput = require("../../validation/register");

const User = require("../../models/User");

router.get("/test", (req, res) => res.json({ poruka: "Korisnici nam rade!"}));

router.post("/register", (req, res) => {
    const { errors, isValid } = validateRegisterInput(req.body);
    // ovde validujemo sva polja
    if(!isValid) {
        return res.status(400).json(errors);
    }

    User.findOne({ email: req.body.email })

        .then(user => {
            if (user) {
                return res.status(400).json({ email: "e-mail postoji!"});
            } else {

                const avatar = gravatar.url(req.body.email, {
                    s: "200", // velicina
                    r: "pg", // rating
                    d: "mm" // default
                });

                const newUser = new User({
                    name: req.body.name,
                    email: req.body.email,
                    avatar,
                    password: req.body.password
                });

                bcrypt.genSalt(10, (err, salt) => {
                    bcrypt.hash(newUser.password, salt, (err, hash) => {
                        if(err) throw err;
                        newUser.password = hash;
                        newUser.save().then(user => res.json(user))
                        .catch(err => console.log(err));
                    });
                });
            }
        });
});
// login korisnika
router.post('/login', (req, res) => {
    const email = req.body.email;
    const password = req.body.password;

    User.findOne({ email }).then(user => {
        if(!user) {
            return res.status(404).json({ email: "Korisnik nije nadjen!" });
        }
      bcrypt.compare(password, user.password).then(isMatch => {
          if(isMatch){
            // res.json({ Poruka: "Uspesno logovanje!" });
            // Sada cemo da poredimo korisnika
            const payload = { id: user.id, name: user.name, avatar: user.avatar };
            // Sada cemo da potpisemo token
            jwt.sign(payload, keys.secretOrKey, { expiresIn: 3600 }, (err, token) => {
                res.json({ success: true, token: "Bearer " + token });
            });
           } else {
              return res.status(400).json({ Poruka: "Password nije tacan!" });
          }
      });
    });
});

// zasticena, privatna ruta korisnika
router.get("/current",
passport.authenticate("jwt", { session: false }),
(req, res) => {
    res.json({
        id: req.user.id,
        name: req.user.name,
        email: req.user.email
    });
});

module.exports = router;