import type { Metadata } from "next";
import { cookies } from "next/headers";
import { authCookieHeader } from "@/lib/cookies";
import { fetchAdminUsers, type AdminUsersResponse } from "@/lib/api";
import { getMeCached } from "@/lib/serverData";
import { isSuperOrOwner } from "@/lib/roles";
import Forbidden from "../Forbidden";
import UsersAdmin, { type UserFilter, type UserSortKey } from "./UsersAdmin";

export const metadata: Metadata = {
  title: "用户管理",
};

const SORT_KEYS = ["id", "role", "status", "points", "last_login", "counts", "created_at", "online"] as const;

function parseSort(raw?: string): UserSortKey {
  return (SORT_KEYS as readonly string[]).includes(raw || "") ? (raw as UserSortKey) : "id";
}

interface UsersPageProps {
  searchParams: Promise<{ q?: string; filter?: string; page?: string; sort?: string; order?: string }>;
}

// 筛选项映射为后端查询参数：管理团队走 role=staff，封禁走 status，其余不过滤
function filterToQuery(filter: UserFilter): { role?: string; status?: string } {
  if (filter === "staff") return { role: "staff" };
  if (filter === "banned") return { status: "banned" };
  return {};
}

// 管理员鉴权由 app/admin/layout.tsx 统一承担；列表首屏 SSR 直出，F5 无骨架闪动
export default async function AdminUsersPage({ searchParams }: UsersPageProps) {
  const sp = await searchParams;
  const q = sp.q?.trim() || "";
  const filter: UserFilter = sp.filter === "staff" || sp.filter === "banned" ? sp.filter : "all";
  const page = Math.max(1, parseInt(sp.page || "1", 10) || 1);
  const sort = parseSort(sp.sort);
  const order: "asc" | "desc" = sp.order === "asc" ? "asc" : "desc";

  const cookie = authCookieHeader(await cookies());
  const me = await getMeCached(cookie || undefined);

  // 仅超级管理员与站长可管理用户与角色
  if (!me.user || !isSuperOrOwner(me.user.role)) {
    return <Forbidden text="用户与角色权限仅超级管理员和站长可操作。" />;
  }

  let initial: AdminUsersResponse | null = null;
  let initError = "";
  try {
    initial = await fetchAdminUsers({ page, q, sort, order, ...filterToQuery(filter) }, cookie || undefined);
  } catch (e) {
    initError = e instanceof Error ? e.message : "获取用户列表失败";
  }

  return (
    <UsersAdmin
      initial={initial}
      initError={initError}
      initialQuery={{ q, filter, page, sort, order }}
      currentUserId={me.user?.id ?? 0}
      currentUserRole={me.user?.role ?? ""}
    />
  );
}