import type { NextConfig } from "next";

const isProd = process.env.NODE_ENV === "production";

/**
 * Content-Security-Policy. Inline styles are required by Tailwind's runtime-free
 * output only for a few third-party components (Radix measures via style attrs),
 * and Next.js injects inline scripts for hydration; nonces are not used because the
 * app is fully static-shell + client-fetch and `next start` runs behind ngrok.
 */
const csp = [
  "default-src 'self'",
  "base-uri 'self'",
  "frame-ancestors 'none'",
  "form-action 'self'",
  "object-src 'none'",
  "img-src 'self' data: blob: https:",
  "font-src 'self' data:",
  "style-src 'self' 'unsafe-inline'",
  isProd ? "script-src 'self' 'unsafe-inline'" : "script-src 'self' 'unsafe-inline' 'unsafe-eval'",
  "connect-src 'self'",
  "worker-src 'self' blob:",
  "upgrade-insecure-requests",
].join("; ");

const nextConfig: NextConfig = {
  reactStrictMode: true,
  poweredByHeader: false,
  agentRules: false,
  serverExternalPackages: ["pg", "argon2", "resend", "@anthropic-ai/sdk", "openai", "@google/genai", "shiki"],
  experimental: {
    serverActions: { bodySizeLimit: "2mb" },
  },
  async headers() {
    return [
      {
        source: "/(.*)",
        headers: [
          { 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=()" },
          { key: "Content-Security-Policy", value: csp },
          ...(isProd ? [{ key: "Strict-Transport-Security", value: "max-age=31536000; includeSubDomains" }] : []),
        ],
      },
    ];
  },
};

export default nextConfig;