import "server-only";
import { cache } from "react";
import { headers } from "next/headers";
import { redirect } from "next/navigation";
import { auth } from "@/lib/auth";

export type CurrentUser = {
  id: string;
  name: string;
  username: string | null;
};

// `cache` React: session divalidasi sekali per request walau dipanggil beberapa komponen.
// Jangan diganti `"use cache"`: cache lintas request membuat user logout tetap dianggap login.
export const getCurrentUser = cache(async (): Promise<CurrentUser> => {
  const session = await auth.api.getSession({ headers: await headers() });
  if (!session) redirect("/login");

  return {
    id: session.user.id,
    name: session.user.name,
    username: session.user.username ?? null,
  };
});

// Dipakai halaman login: session divalidasi (bukan cuma cek cookie) supaya
// cookie kedaluwarsa tidak memicu redirect bolak-balik dengan getCurrentUser().
export async function redirectIfLoggedIn(): Promise<void> {
  const session = await auth.api.getSession({ headers: await headers() });
  if (session) redirect("/");
}