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

    # Compresión gzip para alto rendimiento
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_types text/plain text/css text/xml application/json application/javascript application/xml+rss application/atom+xml image/svg+xml;

    # Encabezados de Seguridad
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Enrutamiento SPA React
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Caché estática para assets generados por Vite
    location ~* \.(?:css|js|woff2?|svg|gif|png|jpg|jpeg|ico)$ {
        expires 1y;
        add_header Cache-Control "public, max-age=31536000, immutable";
    }

    # Proxy inverso para llamadas al Backend Fastify
    location /api/ {
        proxy_pass http://backend:3001;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        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;
    }

    location /health {
        proxy_pass http://backend:3001/health;
    }

    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }
}