server {
    listen 80;

    # Serve the static React build
    location / {
        root /usr/share/nginx/html;
        index index.html;
        # Fallback to index.html for client-side routing
        try_files $uri $uri/ /index.html;
    }

    # Proxy REST API requests to the backend
    location /rooms {
        proxy_pass http://backend:4000;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

    # Proxy the health check endpoint to the backend
    location /health {
        proxy_pass http://backend:4000;
        proxy_http_version 1.1;
    }

    # Proxy Socket.IO — requires WebSocket upgrade headers
    location /socket.io/ {
        proxy_pass http://backend:4000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_cache_bypass $http_upgrade;
    }
}