index.js

const express = require("express");
const cors = require("cors");
const app = express();
const mongoose = require("mongoose");
const rateLimit = require("express-rate-limit");
require("dotenv").config();

const apiLimiter = rateLimit({
	windowMs: 15 * 60 * 1000, 
	limit: 50,
	standardHeaders: true,
	legacyHeaders: false,
})

// Middleware
app.use(cors());
app.use('/api', apiLimiter)
app.use("/public", express.static(`${process.cwd()}/public`));
app.use(express.urlencoded({ extended: true }));
app.use((req, res, next) => {
  res.locals.disableButton = false;
  next();
});

// Controllers
const urlController = require("./controllers/urlController");
const redirectController = require("./controllers/redirectController");

// Routes
app.get("/", (req, res) => {
  res.sendFile(process.cwd() + "/views/index.html");
});

app.post("/api/shorturl", urlController.createShortUrl);
app.get("/api/shorturl/:id", redirectController.redirectToOriginalUrl);

// Connect to MongoDB and start server
const port = process.env.PORT || 3000;
(async () => {
  try {
    await mongoose.connect(process.env.MONGO_CONNECT_URI, {
      useUnifiedTopology: true,
    });
    app.listen(port, () => {
      console.log(`Listening on port ${port}`);
    });
  } catch (error) {
    console.error("Database connection error:", error);
  }
})();

module.exports = {
  app,
};