Refactor dotenv configuration to load environment variables from multiple candidates; add error handling for missing DB_HOST

src/index.js

@@ -1,4 +1,5 @@
 import dotenv from 'dotenv';
+import fs from 'fs';
 import path from 'path';
 import { fileURLToPath } from 'url';
 import express from 'express';
@@ -14,7 +15,31 @@ import pool from './db.js';
 import { setupWebSocket } from './ws.js';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
-dotenv.config({ path: path.join(__dirname, '..', '.env') });
+const envCandidates = [
+  path.join(process.cwd(), '.env'),
+  path.join(__dirname, '..', '.env'),
+  path.join(__dirname, '..', '..', '.env')
+];
+
+let envLoaded = false;
+for (const candidate of envCandidates) {
+  if (fs.existsSync(candidate)) {
+    dotenv.config({ path: candidate });
+    envLoaded = true;
+    break;
+  }
+}
+
+if (!envLoaded) {
+  // eslint-disable-next-line no-console
+  console.warn('Figyelem: .env fajl nem talalhato, ENV valtozok nelkul indul.');
+}
+
+if (!process.env.DB_HOST) {
+  // eslint-disable-next-line no-console
+  console.error('Hiba: DB_HOST nincs beallitva. Ellenorizd az .env fajlt vagy az ENV valtozokat.');
+  process.exit(1);
+}
 
 const app = express();