import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  // The Docker image runs the self-contained server from .next/standalone (see Dockerfile).
  output: process.env.NEXT_OUTPUT === "standalone" ? "standalone" : undefined,
  // ssh2 has optional native bindings and must be loaded by Node, not bundled.
  serverExternalPackages: ["ssh2"],
  // Container clients request /v2/ and /v2/<name>/blobs/uploads/ with a trailing slash and don't
  // follow redirects for uploads, so the built-in redirect is replaced by one that skips /v2.
  skipTrailingSlashRedirect: true,
  // The OAuth consent page must not be framed, or another site could trick a click on "Authorize".
  async headers() {
    return [
      {
        source: "/oauth/authorize",
        headers: [
          { key: "X-Frame-Options", value: "DENY" },
          { key: "Content-Security-Policy", value: "frame-ancestors 'none'" },
        ],
      },
    ];
  },
  // Any page as Markdown, for agents: Accept: text/markdown, or ?format=md (lib/markdown-views.ts).
  async rewrites() {
    const md = "/api/markdown/:path*";
    return {
      beforeFiles: [
        { source: "/", has: [{ type: "header", key: "accept", value: "(?:.*,\\s*)?text/markdown.*" }], destination: "/api/markdown" },
        { source: "/", has: [{ type: "query", key: "format", value: "md" }], destination: "/api/markdown" },
        { source: "/:path((?!api/|_next/|v2(?:/|$)).+)", has: [{ type: "header", key: "accept", value: "(?:.*,\\s*)?text/markdown.*" }], destination: md },
        { source: "/:path((?!api/|_next/|v2(?:/|$)).+)", has: [{ type: "query", key: "format", value: "md" }], destination: md },
      ],
      afterFiles: [],
      fallback: [],
    };
  },
  async redirects() {
    return [{ source: "/:path((?!v2(?:/|$)).+)/", destination: "/:path", permanent: true }];
  },
  experimental: {
    authInterrupts: true,
    serverActions: {
      // Large enough for file uploads through the web UI.
      bodySizeLimit: "25mb",
    },
  },
};

export default nextConfig;