server.js

/**
 * @file server.js
 * @description Server configuration and initialization.
 */

// Load environment variables from .env file
require("dotenv").config();

// Load required modules
const express = require("express");
const bodyParser = require("body-parser");
const preprocessRequestDetailsMiddleware = require("./src/middlewares/preprocessRequestDetailsMiddleware");
const responseMiddleware = require("./src/middlewares/responseMiddleware");
const authMiddleware = require("./src/middlewares/authMiddleware");
const db = require("./src/db/db");
const routes = require("./src/routes");

const port = process.env.PORT || 5000;
const host = process.env.HOST || "localhost";

const app = express();

// Trust the first proxy
app.set("trust proxy", 1);

// Connect to the database
if (process.env.NODE_ENV !== "test") db.connectDB();

// Middleware setup
app.use(bodyParser.json());
app.use(preprocessRequestDetailsMiddleware);
app.use(responseMiddleware);
app.use(authMiddleware);

// Routes setup
app.use("/api", routes);

// Start the server
const server = app.listen(port, host, () => {
  console.log(`Server running at http://${host}:${port}/`);
});

// Handle SIGTERM gracefully
process.on("SIGTERM", async () => {
  console.info("SIGTERM signal received.");
  console.log("Closing server...");
  await app.close();
});

// Handle SIGINT gracefully
process.on("SIGINT", async () => {
  console.info("SIGINT signal received.");
  console.log("Closing server...");
  await app.close();
});

app.close = async () => {
  await db.disconnectDB();
  server.close();
};

// Export the app for testing
module.exports = app;