/** @type {import('next').NextConfig} */

// Inline <script>/<style> are unavoidable here: JSON-LD schema blocks, Next's
// own bootstrap script, and the pervasive `style={{...}}` props in the theme.
// Everything else is locked to self + the known CMS/embed hosts.
const contentSecurityPolicy = [
  "default-src 'self'",
  "script-src 'self' 'unsafe-inline' 'unsafe-eval'",
  "style-src 'self' 'unsafe-inline'",
  "img-src 'self' data: blob: https://zinisoft.net https://admin.zinisoft.net https://secure.gravatar.com",
  "font-src 'self' data:",
  "connect-src 'self' https://admin.zinisoft.net",
  "frame-src 'self' https://www.youtube.com https://www.youtube-nocookie.com https://player.vimeo.com",
  "object-src 'none'",
  "base-uri 'self'",
  "form-action 'self'",
  "frame-ancestors 'self'",
  "upgrade-insecure-requests",
].join("; ");

const securityHeaders = [
  { key: "Content-Security-Policy", value: contentSecurityPolicy },
  {
    key: "Strict-Transport-Security",
    value: "max-age=63072000; includeSubDomains; preload",
  },
  { key: "X-Frame-Options", value: "SAMEORIGIN" },
  { key: "X-Content-Type-Options", value: "nosniff" },
  { key: "Referrer-Policy", value: "strict-origin-when-cross-origin" },
  { key: "X-DNS-Prefetch-Control", value: "on" },
  {
    key: "Permissions-Policy",
    value: "camera=(), microphone=(), geolocation=(), browsing-topics=()",
  },
];

const nextConfig = {
  reactStrictMode: true,
  poweredByHeader: false,
  images: {
    // Narrow breakpoint set: every extra size is another variant the optimizer
    // can be asked to generate, which is the DoS surface in the advisories for
    // the Image Optimization API.
    deviceSizes: [640, 828, 1080, 1200, 1920],
    imageSizes: [96, 180, 256, 384],
    formats: ["image/avif", "image/webp"],
    minimumCacheTTL: 2678400, // 31 days — bounds on-disk cache churn
    remotePatterns: [
      {
        protocol: "https",
        hostname: "zinisoft.net",
      },
      {
        protocol: "https",
        hostname: "admin.zinisoft.net",
      },
      {
        protocol: "https",
        hostname: "secure.gravatar.com",
      },
    ],
  },
  async headers() {
    return [
      {
        source: "/:path*",
        headers: securityHeaders,
      },
    ];
  },
};

module.exports = nextConfig;