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

    # Proxy API requests to the FastAPI backend
    location /api/ {
        proxy_pass http://api:8000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        # WebSocket support (for /api/v1/ws/*)
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

    # SPA routing — all other paths fall back to index.html
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Cache static assets aggressively
    location ~* \.(js|css|woff2|png|svg|ico)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml text/javascript;
}