const express = require('express');
const rateLimit = require('express-rate-limit');

const app = express();

// Apply a basic rate limit to all requests
// 100 requests per 15 minutes per IP
const apiLimiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100, // Max 100 requests per windowMs
  message: 'Too many requests from this IP, please try again after 15 minutes',
  standardHeaders: true, // Return rate limit info in the `RateLimit-*` headers
  legacyHeaders: false, // Disable the `X-RateLimit-*` headers
});

// Apply the rate limiter to specific routes or globally
app.use('/api/', apiLimiter);

app.get('/api/data', (req, res) => {
  res.json({ message: 'This is some data. You are rate-limited.' });
});

app.get('/', (req, res) => {
  res.send('Welcome to the API. Try accessing /api/data multiple times.');
});

const PORT = 3000;
app.listen(PORT, () => {
  console.log(`Server running on http://localhost:${PORT}`);
  console.log('Access /api/data to test rate limiting.');
});