import type { NextConfig } from 'next';
import type { RemotePattern } from 'next/dist/shared/lib/image-config';

function resolveBunnyCdnHostname(): string | null {
  const raw = process.env.BUNNY_CDN_URL || process.env.NEXT_PUBLIC_BUNNY_CDN_URL;
  if (!raw) return null;
  try {
    const parsed = new URL(raw);
    return parsed.hostname || null;
  } catch {
    return raw.replace(/^https?:\/\//, '').replace(/\/+$/, '') || null;
  }
}

const bunnyCdnHostname = resolveBunnyCdnHostname();

// Content-Security-Policy is set at request time in proxy.ts so runtime storage
// endpoints (R2_PRESIGN_ENDPOINT, etc.) are available in Docker deployments.
const securityHeaders = [
  // Prevent the app from being embedded in foreign iframes (clickjacking)
  { key: 'X-Frame-Options', value: 'DENY' },
  // Prevent MIME-type sniffing on all responses
  { key: 'X-Content-Type-Options', value: 'nosniff' },
  // Enforce HTTPS for 2 years
  { key: 'Strict-Transport-Security', value: 'max-age=63072000; includeSubDomains' },
  // microphone=(self) is required for audio comment recording; camera/geolocation unused
  { key: 'Permissions-Policy', value: 'camera=(), microphone=(self), geolocation=()' },
  { key: 'Referrer-Policy', value: 'strict-origin-when-cross-origin' },
];

const remotePatterns: RemotePattern[] = [
  { protocol: 'https', hostname: 'img.youtube.com' },
  { protocol: 'https', hostname: 'i.ytimg.com' },
  { protocol: 'https', hostname: 'images.unsplash.com' },
  { protocol: 'https', hostname: 'vz-thumbnail.b-cdn.net' },
  ...(bunnyCdnHostname ? [{ protocol: 'https' as const, hostname: bunnyCdnHostname }] : []),
];

const nextConfig: NextConfig = {
  images: {
    remotePatterns,
    formats: ['image/avif', 'image/webp'],
  },
  experimental: {
    optimizePackageImports: ['lucide-react', 'radix-ui'],
    serverMinification: true,
  },
  poweredByHeader: false,
  compress: true,
  async headers() {
    return [
      // Global security headers applied to every response
      {
        source: '/(.*)',
        headers: securityHeaders,
      },
      {
        source: '/_next/static/:path*',
        headers: [
          {
            key: 'Cache-Control',
            value: 'public, max-age=31536000, immutable',
          },
        ],
      },
      {
        source: '/images/:path*',
        headers: [
          {
            key: 'Cache-Control',
            value: 'public, max-age=2592000',
          },
        ],
      },
      {
        source: '/:path*.ico',
        headers: [
          {
            key: 'Cache-Control',
            value: 'public, max-age=604800',
          },
        ],
      },
      {
        source: '/:path*.svg',
        headers: [
          {
            key: 'Cache-Control',
            value: 'public, max-age=2592000',
          },
        ],
      },
    ];
  },
};

export default nextConfig;