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

    # Gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml text/javascript;
    gzip_min_length 256;

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

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

    # Proxy API requests to backend
    # Uses resolver so nginx doesn't crash if backend isn't available at startup
    resolver 127.0.0.11 valid=30s ipv6=off;
    set $backend "extrudex-api:8080";

    location /api/ {
        proxy_pass http://$backend;
        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;
    }

    # Health check endpoint
    location /health {
        access_log off;
        return 200 "ok";
        add_header Content-Type text/plain;
    }
}