events {
    worker_connections 1024;
}

http {
    upstream orbital_backend {
        server orbital-simulator:3000;
    }

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;

    server {
        listen 80;
        server_name _;

        # Redirect HTTP to HTTPS in production
        # return 301 https://$server_name$request_uri;

        # For development, serve directly
        location / {
            proxy_pass http://orbital_backend;
            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 (if needed in future)
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
        }

        # API rate limiting
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            proxy_pass http://orbital_backend;
            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;
        }

        # Static file caching
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2)$ {
            proxy_pass http://orbital_backend;
            proxy_set_header Host $host;
            expires 1y;
            add_header Cache-Control "public, immutable";
        }
    }

    # HTTPS server (uncomment for production with SSL certificates)
    # server {
    #     listen 443 ssl http2;
    #     server_name your-domain.com;
    #
    #     ssl_certificate /etc/nginx/ssl/cert.pem;
    #     ssl_certificate_key /etc/nginx/ssl/key.pem;
    #     ssl_protocols TLSv1.2 TLSv1.3;
    #     ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512;
    #     ssl_prefer_server_ciphers off;
    #
    #     location / {
    #         proxy_pass http://orbital_backend;
    #         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;
    #     }
    # }
}