server {
    listen 80;
    server_name _;

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

    # Proxy API calls to the FastAPI backend
    location /api/ {
        proxy_pass         http://backend:8001/;
        proxy_http_version 1.1;
        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;
        proxy_read_timeout 120s;
        proxy_send_timeout 120s;

        # WebSocket / SSE support
        proxy_set_header   Upgrade    $http_upgrade;
        proxy_set_header   Connection "upgrade";
    }

    # Serve React SPA — fallback to index.html for client-side routing
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
}