require('dotenv').config();
const express = require('express');
const cors = require('cors');
const dns = require("dns");
const app = express();
const shorturls = ['https://freecodecamp.org']

// Basic Configuration
const port = process.env.PORT || 3000;

app.use(cors());

app.use('/public', express.static(`${process.cwd()}/public`));
app.use(express.json()) // for parsing application/json
app.use(express.urlencoded({ extended: true })) // for parsing application/x-www-form-urlencoded

app.get('/', function(req, res) {
  res.sendFile(process.cwd() + '/views/index.html');
});

// Your first API endpoint

app.get('/api/shorturl/:id', (req, res) => {
  res.redirect(shorturls[req.params.id])
})

app.post('/api/shorturl', (req, res) => {
  const url = req.body.url;
  const id = shorturls.length;
  const domain = (new URL(url)).host
  dns.lookup(domain, (err) => {
    if (err) return res.json({error: 'invalid url'})
    shorturls.push(url);
    res.json({ original_url : url, short_url : id})
  })
})

app.listen(port, function() {
  console.log(`Listening on port ${port}`);
});