events {
    worker_connections 1024;
}

http {
    # Basic security settings
    server_tokens off;  # Don't show nginx version
    client_max_body_size 10M;  # Limit request size
    client_body_timeout 12;
    client_header_timeout 12;

    upstream gradio_app {
        server llmdataparser:7860;
        keepalive 32;
    }

    server {
        listen 80;
        server_name localhost;

        # Enhanced security headers
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-XSS-Protection "1; mode=block" always;
        add_header Referrer-Policy "strict-origin-always" always;
        add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; style-src 'self' 'unsafe-inline';" always;
        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

        location / {
            proxy_pass http://gradio_app;
            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_set_header X-Forwarded-Proto $scheme;

            # WebSocket support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";

            # Timeouts
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;

            # Security
            proxy_buffering on;
            proxy_buffer_size 8k;
            proxy_buffers 8 8k;
        }

        # Deny access to hidden files
        location ~ /\. {
            deny all;
            return 404;
        }
    }
}