import { NextRequest, NextResponse } from "next/server";

const PUBLIC_UTILITY_APIS = new Set([
  "/api/bgbye/process",
  "/api/files/list",
  "/api/files/raw",
  "/api/files/download",
]);

const LEGACY_TOOL_PATHS: Record<string, string> = {
  "/laser-toolkit": "laser-toolkit",
  "/files": "files",
  "/background-remover": "background-remover",
};

/**
 * Temporary utility-only site.
 *
 * Directus-backed pages and APIs remain in source history but cannot be reached
 * through this deployment. This middleware deliberately performs no session or
 * Directus request.
 */
export function middleware(req: NextRequest) {
  const { pathname } = req.nextUrl;

  if (pathname === "/") return NextResponse.next();

  const legacyTool = LEGACY_TOOL_PATHS[pathname.replace(/\/$/, "")];
  if (legacyTool) {
    const url = req.nextUrl.clone();
    url.pathname = "/";
    url.search = "";
    url.searchParams.set("tool", legacyTool);
    return NextResponse.redirect(url);
  }

  if (pathname === "/portal/utilities") {
    const url = req.nextUrl.clone();
    const requested = url.searchParams.get("t");
    url.pathname = "/";
    url.search = "";
    if (requested && ["laser-toolkit", "files", "background-remover"].includes(requested)) {
      url.searchParams.set("tool", requested);
    }
    return NextResponse.redirect(url);
  }

  if (PUBLIC_UTILITY_APIS.has(pathname)) return NextResponse.next();

  if (pathname.startsWith("/api/")) {
    return NextResponse.json({ error: "Not available on the temporary utility site" }, { status: 404 });
  }

  const home = req.nextUrl.clone();
  home.pathname = "/";
  home.search = "";
  return NextResponse.redirect(home);
}

export const config = {
  matcher: ["/((?!_next/static|_next/image|favicon.ico|robots.txt|sitemap.xml|images|static).*)"],
};