upstream haproxy_backend {
    server 10.0.0.20:80;
    keepalive 32;
    keepalive_timeout 60s;
    keepalive_requests 100;
}

server {
    listen 443 ssl; #http2;
    listen [::]:443 ssl; # http2;
    server_name *.novicelab.io;

    # SSL Certificate paths
    ssl_certificate /etc/letsencrypt/live/novicelab.io/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/novicelab.io/privkey.pem;

    # SSL Protocol - TLS 1.2 and 1.3 only
    ssl_protocols TLSv1.2 TLSv1.3;
    
    # Cipher suites (prioritize TLS 1.3, secure TLS 1.2 fallback)
    ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
    ssl_prefer_server_ciphers off;

    # SSL session configuration
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:10m;
    ssl_session_tickets off;

    resolver 127.0.0.11 8.8.8.8 8.8.4.4 valid=300s;
    resolver_timeout 5s;

    # Security Headers
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
    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-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self' https: data: 'unsafe-inline' 'unsafe-eval';" always;

    # Logging
    access_log /var/log/nginx/*.novicelab.io_access.log;
    error_log /var/log/nginx/*.novicelab.io_error.log;

    location / {
        proxy_pass http://10.0.0.20:80; # Assuming HAProxy is on port 8080
        # proxy_pass http://haproxy_backend;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        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;
        
        # Performance optimizations
        proxy_buffering off;
        proxy_request_buffering off;
        # Timeouts
        proxy_connect_timeout 300;
        proxy_send_timeout 300;
        proxy_read_timeout 300;
        send_timeout 300;

        client_max_body_size 0;
    }
}