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

export async function updateSession(request: NextRequest) {
  let response = 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: { name: string; value: string; options?: CookieOptions }[]) {
          cookiesToSet.forEach(({ name, value }) =>
            request.cookies.set(name, value)
          );
          response = NextResponse.next({ request });
          cookiesToSet.forEach(({ name, value, options }) =>
            response.cookies.set(name, value, options)
          );
        },
      },
    }
  );

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

  const path = request.nextUrl.pathname;
  const isPublic = path === "/login" || path === "/register" || path.startsWith("/auth");

  // Not signed in and trying to reach a protected page -> login
  if (!user && !isPublic) {
    const url = request.nextUrl.clone();
    url.pathname = "/login";
    return NextResponse.redirect(url);
  }

  // Already signed in and on the login page -> dashboard
  if (user && path === "/login") {
    const url = request.nextUrl.clone();
    url.pathname = "/";
    return NextResponse.redirect(url);
  }

  return response;
}