refactor: improve server initialization and port handling

- Separate server setup from initialization\n- Add port availability check utility\n- Fix double server start issue\n- Improve error handling for port conflicts

src/index.ts

@@ -0,0 +1,24 @@
+import './config/env'; // Load environment variables first
+import { startServer } from './server';
+import { isPortAvailable } from './utils/portCheck';
+import { testConnection } from './lib/supabase';
+
+const PORT = process.env.PORT || 3001;
+
+const init = async () => {
+  if (!await isPortAvailable(PORT)) {
+    console.error(`Port ${PORT} is in use. Please try a different port or free up the current one.`);
+    process.exit(1);
+  }
+
+  // Test Supabase connection
+  const isConnected = await testConnection();
+  if (!isConnected) {
+    console.error('Failed to connect to Supabase. Please check your configuration.');
+    process.exit(1);
+  }
+
+  startServer();
+};
+
+init().catch(console.error); 

src/server.ts

@@ -0,0 +1,21 @@
+import express from 'express';
+import cors from 'cors';
+import { env } from './config/env';
+import app from './app';
+import { HealthCheckService } from './lib/services/healthCheck';
+
+const port = env.PORT || 3000;
+
+// Health check endpoint
+app.get('/health', async (req, res) => {
+  const health = await HealthCheckService.checkHealth();
+  res.json(health);
+});
+
+export function startServer() {
+  return app.listen(port, () => {
+    console.log(`Server is running on port ${port}`);
+  });
+}
+
+export default app; 

src/utils/portCheck.ts

@@ -0,0 +1,18 @@
+import net from 'net';
+
+export function isPortAvailable(port: number | string): Promise<boolean> {
+  return new Promise((resolve) => {
+    const server = net.createServer();
+
+    server.once('error', () => {
+      resolve(false);
+    });
+
+    server.once('listening', () => {
+      server.close();
+      resolve(true);
+    });
+
+    server.listen(port);
+  });
+}