server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # SPA: route everything that isn't a real file back to index.html so
    # TanStack Router handles deep links.
    location / {
        try_files $uri $uri/ /index.html;
    }

    # API → Rust backend. The compose network name `backend` resolves to the
    # smgw-pki-automator service.
    location /api/ {
        proxy_pass http://backend:8443/api/;
        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;

        # mTLS terminating proxy in front of nginx is expected to set this
        # header. In dev (DEV_AUTH=1) the backend accepts a body field instead.
        proxy_set_header X-Forwarded-Cert-Subject $http_x_forwarded_cert_subject;

        proxy_buffering off;
        proxy_read_timeout 300s;
    }

    # PKI callback path (TR-03129-4). Kept separate so it can be moved behind
    # a different listener that requires a Sub-CA client certificate.
    location /pki/ {
        proxy_pass http://backend:8443/pki/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }

    # Long-cache hashed assets.
    location ~* \.(js|css|woff2?|svg|png|webp|avif)$ {
        expires 7d;
        access_log off;
        try_files $uri =404;
    }
}