import type { NextConfig } from "next";

const isDev = process.env.NODE_ENV !== "production";

/**
 * CSP base para la web pública (páginas estáticas/ISR, sin nonce).
 * El panel /admin recibe una CSP estricta con nonce desde src/proxy.ts.
 */
const publicCsp = [
  "default-src 'self'",
  `script-src 'self' 'unsafe-inline'${isDev ? " 'unsafe-eval'" : ""}`,
  "style-src 'self' 'unsafe-inline'",
  "img-src 'self' data: blob: https://res.cloudinary.com",
  "font-src 'self'",
  "connect-src 'self'",
  "object-src 'none'",
  "base-uri 'self'",
  "form-action 'self'",
  "frame-ancestors 'none'",
  ...(isDev ? [] : ["upgrade-insecure-requests"]),
].join("; ");

const securityHeaders = [
  { key: "X-Content-Type-Options", value: "nosniff" },
  { key: "X-Frame-Options", value: "DENY" },
  { key: "Referrer-Policy", value: "strict-origin-when-cross-origin" },
  {
    key: "Permissions-Policy",
    value: "camera=(), microphone=(), geolocation=(), payment=(), usb=()",
  },
  { key: "Cross-Origin-Opener-Policy", value: "same-origin" },
  ...(isDev
    ? []
    : [{ key: "Strict-Transport-Security", value: "max-age=63072000; includeSubDomains" }]),
];

const nextConfig: NextConfig = {
  output: "standalone",
  poweredByHeader: false,
  reactStrictMode: true,
  // Módulos nativos / de Node que no deben empaquetarse.
  serverExternalPackages: ["@node-rs/argon2", "pino"],
  experimental: {
    // Habilita forbidden() / unauthorized() para respuestas 403 / 401 reales.
    authInterrupts: true,
  },
  images: {
    remotePatterns: [{ protocol: "https", hostname: "res.cloudinary.com" }],
  },
  async headers() {
    return [
      { source: "/:path*", headers: securityHeaders },
      {
        // Todo excepto /admin (que lleva su propia CSP con nonce).
        source: "/((?!admin).*)",
        headers: [{ key: "Content-Security-Policy", value: publicCsp }],
      },
    ];
  },
};

export default nextConfig;