import { createServerClient, type SetAllCookies } from "@supabase/ssr";
import { NextResponse, type NextRequest } from "next/server";

export async function middleware(request: NextRequest) {
  let supabaseResponse = NextResponse.next({ request });

  const supabase = createServerClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY!,
    {
      cookies: {
        getAll() {
          return request.cookies.getAll();
        },
        setAll(cookiesToSet: Parameters<SetAllCookies>[0]) {
          cookiesToSet.forEach(({ name, value }) =>
            request.cookies.set(name, value)
          );
          supabaseResponse = NextResponse.next({ request });
          cookiesToSet.forEach(({ name, value, options }) =>
            supabaseResponse.cookies.set(name, value, options)
          );
        },
      },
    }
  );

  const {
    data: { user },
  } = await supabase.auth.getUser();

  // Protect /dashboard routes
  if (!user && request.nextUrl.pathname.startsWith("/dashboard")) {
    const url = request.nextUrl.clone();
    url.pathname = "/auth/login";
    return NextResponse.redirect(url);
  }

  // Redirect logged-in users away from auth pages
  if (
    user &&
    (request.nextUrl.pathname === "/auth/login" ||
      request.nextUrl.pathname === "/auth/signup")
  ) {
    const url = request.nextUrl.clone();
    url.pathname = "/dashboard";
    return NextResponse.redirect(url);
  }

  return supabaseResponse;
}

export const config = {
  matcher: ["/dashboard/:path*", "/auth/:path*"],
};