var express = require('express');
var router = express.Router();

var mongodb = require('mongodb');
var mLab = "mongodb://localhost:27017/url-shortener-microservice";
var MongoClient = mongodb.MongoClient

var shortid = require('shortid');
var validUrl = require('valid-url');

/* GET home page. */
router.get('/', function(req, res, next) {
  res.render('index', { title: 'Express' });
});

router.get('/new/:url(*)', function (req, res, next) {
  MongoClient.connect(mLab, function (err, db) {
    if (err) {
      console.log("Unable to connect to server", err);
    } else {
      console.log("Connected to server")

      var collection = db.collection('links');
      var params = req.params.url;

      var newLink = function (db, callback) {
        if (validUrl.isUri(params)) {
          // if URL is valid, do this
          var shortCode = shortid.generate();
          var newUrl = { url: params, short: shortCode };
          collection.insert([newUrl]);
          res.json({ original_url: params, short_url: "localhost:3000/" + shortCode });
        } else {
         // if URL is invalid, do this
          res.json({ error: "Wrong url format, make sure you have a valid protocol and real site." });
        };
      };

      newLink(db, function () {
        db.close();
      });

    };
  });

});

module.exports = router;