import type { NextConfig } from "next";

// Pragmatic baseline Content-Security-Policy for a Next.js app.
// NOTE: Next 16 commonly needs 'unsafe-inline' for styles/scripts when no
// nonce pipeline is configured. Tightening this to per-request nonces
// (removing 'unsafe-inline') is a recommended follow-up.
const contentSecurityPolicy = [
  "default-src 'self'",
  "img-src 'self' data: blob: https:",
  "style-src 'self' 'unsafe-inline'",
  "script-src 'self' 'unsafe-inline'",
  "font-src 'self' data:",
  "connect-src 'self' https://api.stripe.com https://api.openai.com https://api.resend.com",
  "frame-src https://js.stripe.com https://hooks.stripe.com",
  "frame-ancestors 'none'",
  "base-uri 'self'",
  "form-action 'self'",
].join("; ");

const nextConfig: NextConfig = {
  // Emit a self-contained server bundle at .next/standalone so the Docker
  // image (used by Coolify) ships only the files needed to run `node server.js`.
  output: "standalone",

  // Strict security headers applied to every route.
  async headers() {
    return [
      {
        source: "/(.*)",
        headers: [
          { key: "X-Content-Type-Options", value: "nosniff" },
          { key: "X-Frame-Options", value: "DENY" },
          // no-referrer prevents the tenant-portal token (carried in the URL)
          // from leaking to third parties via the Referer header.
          { key: "Referrer-Policy", value: "no-referrer" },
          {
            key: "Strict-Transport-Security",
            value: "max-age=63072000; includeSubDomains; preload",
          },
          { key: "X-DNS-Prefetch-Control", value: "off" },
          { key: "Content-Security-Policy", value: contentSecurityPolicy },
        ],
      },
    ];
  },
};

export default nextConfig;