server {
    listen 80;
    server_name _;

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

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;

    # Cache static assets (Angular uses content hashes)
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # Cache hashed JS/CSS bundles
    location ~* \.(js|css)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # Proxy API requests to backend
    location /api/ {
        proxy_pass http://backend:8080/api/;
        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 SignalR WebSocket connections to backend
    location /hubs/ {
        proxy_pass http://backend:8080/hubs/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        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 86400;
    }

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