server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    add_header Content-Security-Policy "default-src 'self'; connect-src 'self'; img-src 'self' data:; script-src 'self'; style-src 'self' 'unsafe-inline'; frame-ancestors 'none'; base-uri 'self'; form-action 'self'" always;
    add_header Referrer-Policy "no-referrer" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "DENY" always;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;

    # Gehashte Assets: 1 Jahr cachen (immutable wg. Content-Hash im Dateinamen)
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # SPA-Entry nie cachen
    location = /index.html {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";
    }

    # Bridge-Endpunkte (Agent-zu-Backend): separater Pfad ohne CSP-Einschränkungen
    # für Gateway-Calls. Kein Caching, kein Buffering.
    location /api/bridge/ {
        proxy_pass http://api:8080;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Agent-Id $http_x_agent_id;
        proxy_buffering off;
        proxy_read_timeout 120s;
    }

    # Dashboard SSE stream: single dedicated non-buffered block.
    location = /api/dashboard/live {
        proxy_pass http://api:8080;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 1h;
        proxy_send_timeout 1h;
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
        add_header X-Accel-Buffering no always;
    }

    location /api/ {
        proxy_pass http://api:8080;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }

    location /health {
        proxy_pass http://api:8080/health;
    }

    location / {
        try_files $uri $uri/ /index.html;
    }
}