import fs from 'fs';
import nomad from './core';

const PORT = 1337;
let count = 0;

const stats = file =>
  new Promise((resolve, reject) => {
    fs.stat(file, (err, stat) => err ? reject(err) : resolve(stat));
  });

const assets = path => async (req, res, next) => {
  try {
    const filePath = `${path}${req.url}`; 
    const stat = await stats(filePath);
    if (!stat.isFile()) throw new Error('Cannot load directory');
    res.statusCode = 200;
    res.body = fs.createReadStream(filePath);
  } catch(e) {
    await next();
  }
}

const app = nomad();

app.use(async (req, res, next) => {
  const time = Date.now();
  console.log(`initiate req ${++count}`);
  await next();
  res.setHeader('Response-Time', `${Date.now() - time}ms`);
});

app.use(async (req, res, next) => {
  try { await next() }
  catch(e) {
    res.statusCode = 500;
    res.body = e.message;
  }
});

app.get(assets(process.cwd()));

app.use('/hello', (req, res, next) => {
  res.statusCode = 200;
  res.body = 'hello';
});

app.use('/world', (req, res, next) => {
  res.statusCode = 200;
  res.body = 'world';
});

app.get('/file', (req, res, next) => {
  res.statusCode = 200;
  res.body = fs.createReadStream(`${process.cwd()}/package.json`);
});

app.use(() => {
  throw new Error('Route not found.');
});

app.listen(PORT, () => console.log(`Server started on: ${PORT}`));