upstream drone_backend {
    server drone:80;

    # Keep up to 32 idle connections per worker
    keepalive 16;

    # Maximum time a connection can be idle
    keepalive_timeout 60s;

    # Maximum requests per keepalive connection
    keepalive_requests 100;
}

server {
    listen 80;
    server_name drone.novicelab.io;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl;
    listen [::]:443 ssl;
    http2 on;
    server_name drone.novicelab.io;

    # SSL
    ssl_certificate /etc/letsencrypt/live/novicelab.io/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/novicelab.io/privkey.pem;
    ssl_trusted_certificate /etc/letsencrypt/live/novicelab.io/chain.pem;

    # 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;
    add_header Permissions-Policy        "interest-cohort=()" always;

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

    # set $drone_backend drone:80;

    location / {
        proxy_pass http://drone_backend;

        proxy_set_header Host               $host;
        proxy_set_header X-Real-IP          $remote_addr;
        proxy_set_header X-Forwarded-Scheme $scheme;
        proxy_set_header X-Forwarded-Proto  $scheme; #https;
        proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Host   $http_host;
        proxy_set_header X-Forwarded-Port   $server_port;

        # WebSocket support for real-time updates
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # Timeouts
        proxy_connect_timeout 300;
        proxy_send_timeout 300;
        proxy_read_timeout 300;
        send_timeout 300;
    }
}