import { clerkMiddleware, createRouteMatcher } from "@clerk/nextjs/server";
import { NextResponse } from "next/server";

const isProtectedRoute = createRouteMatcher(["/chat(.*)", "/api(.*)"]);

/**
 * Middleware that keeps the landing page (/) public but protects /chat and /api.
 * If the user is not authenticated, redirect to the embedded /sign-in route,
 * passing a redirect_url param so that after sign-in they return to the
 * originally requested URL.
 */
export default clerkMiddleware(async (auth, req) => {
  const { userId } = await auth();

  if (isProtectedRoute(req) && !userId) {
    const signInUrl = new URL("/sign-in", req.url);
    signInUrl.searchParams.set("redirect_url", req.url);
    return NextResponse.redirect(signInUrl);
  }

  return NextResponse.next();
});

export const config = {
  matcher: [
    // Skip Next.js internals and all static files, unless found in search params
    "/((?!_next|[^?]*\\.(?:html?|css|js(?!on)|jpe?g|webp|png|gif|svg|ttf|woff2?|ico|csv|docx?|xlsx?|zip|webmanifest)).*)",
    // Always run for API routes
    "/(api|trpc)(.*)",
  ],
};