import { withPayload } from "@payloadcms/next/withPayload";
import type { NextConfig } from "next";
import path from "path";
import { fileURLToPath } from "url";

const __filename = fileURLToPath(import.meta.url);
const dirname = path.dirname(__filename);

// Applied to every route, including /admin and /api - none of these
// constrain what the page can load/render, so they can't break the Payload
// admin bundle. Camera/microphone/display-capture are allowed for the
// site's own origin because the WebRTC call pages (app/(call)/**) need them.
const baseSecurityHeaders = [
  { key: "X-Content-Type-Options", value: "nosniff" },
  { key: "X-Frame-Options", value: "SAMEORIGIN" },
  { key: "Referrer-Policy", value: "strict-origin-when-cross-origin" },
  { key: "Permissions-Policy", value: "camera=(self), microphone=(self), display-capture=(self), geolocation=(), payment=()" },
  // Browsers only ever honor this over an actual HTTPS connection, so it's
  // harmless to send in local http:// dev too.
  { key: "Strict-Transport-Security", value: "max-age=63072000; includeSubDomains" },
];

// Deliberately NOT applied to /admin or /api: Payload's admin bundle isn't
// audited here for CSP compatibility, and API routes serve data, not HTML,
// so a content policy doesn't apply to them anyway. connect-src permits the
// separately hosted LiveKit SFU and Cloudflare Turnstile at runtime. style-src needs
// 'unsafe-inline' because Next App Router emits inline RSC flight/bootstrap
// scripts that are required for hydration. script-src allows 'unsafe-eval'
// only in dev, matching Next's own documented CSP guidance - React uses eval
// there for server-error-stack reconstruction; neither React nor Next use it
// in a production build.
const isDev = process.env.NODE_ENV === "development";
const frontendCSP = [
  "default-src 'self'",
  `script-src 'self' 'unsafe-inline' https://challenges.cloudflare.com${isDev ? " 'unsafe-eval'" : ""}`,
  "style-src 'self' 'unsafe-inline'",
  "img-src 'self' data: blob:",
  "font-src 'self' data:",
  "connect-src 'self' https://challenges.cloudflare.com wss: stun: turn: turns:",
  "media-src 'self' blob:",
  "frame-src 'self' https://challenges.cloudflare.com",
  "frame-ancestors 'self'",
  "base-uri 'self'",
  "form-action 'self'",
  "object-src 'none'",
  "upgrade-insecure-requests",
].join("; ");

const nextConfig: NextConfig = {
  // NOT "standalone": this project uses a custom server (server.ts), and
  // standalone output can't be combined with
  // a custom server. The Dockerfile runs the full app via `npm start` instead.
  images: {
    localPatterns: [
      {
        pathname: "/api/media/file/**",
      },
    ],
  },
  // Two root layouts exist - app/(frontend) and app/(payload) - so a single
  // not-found.tsx can't compose a 404; see app/global-not-found.tsx.
  experimental: {
    globalNotFound: true,
  },
  turbopack: {
    root: path.resolve(dirname),
  },
  async headers() {
    return [
      { source: "/:path*", headers: baseSecurityHeaders },
      { source: "/((?!admin|api).*)", headers: [{ key: "Content-Security-Policy", value: frontendCSP }] },
    ];
  },
};

export default withPayload(nextConfig, { devBundleServerPackages: false });