import { redirect } from "next/navigation";
import Link from "next/link";
import { cookies } from "next/headers";
import { authCookieHeader } from "@/lib/cookies";
import { getMeCached } from "@/lib/serverData";
import { fetchNotifications } from "@/lib/api";
import Pagination from "@/components/Pagination";
import NotificationsClient from "./NotificationsClient";

interface NotificationsPageProps {
  searchParams: Promise<{ page?: string }>;
}

// SSR 直出通知列表：F5 直接看到内容，不再先渲染"正在加载…"
export default async function NotificationsPage({ searchParams }: NotificationsPageProps) {
  const sp = await searchParams;
  const page = Math.max(1, parseInt(sp.page || "1", 10) || 1);
  const cookie = authCookieHeader(await cookies());
  const me = await getMeCached(cookie || undefined);
  if (!me.user) {
    redirect(`/login?redirect=${encodeURIComponent(`/notifications`)}`);
  }

  let data = null;
  let loadError = false;
  try {
    data = await fetchNotifications(page, cookie);
  } catch {
    loadError = true;
  }

  return (
    <div className="w-full">
      <h1 className="text-[22px] sm:text-[26px] font-extrabold tracking-tight mb-4 sm:mb-5" style={{ color: "var(--ink)" }}>
        通知中心
      </h1>

      {loadError || !data ? (
        <div className="panel text-center py-16 px-6" role="alert">
          <p className="text-sm font-semibold" style={{ color: "var(--ink-2)" }}>通知加载失败</p>
          <p className="meta mt-1.5 mb-4">网络异常，请稍后重试</p>
          <Link href="/notifications" className="btn btn-line btn-sm">重新加载</Link>
        </div>
      ) : (
        <div className="grid gap-4 items-start lg:grid-cols-[248px_minmax(0,1fr)]">
          {/* 左栏 sticky 概览 + 全部已读（客户端组件，行内未读数点击后同步刷新）；右列列表 + 分页 */}
          <NotificationsClient initialData={data} initialUnread={me.unread_count}>
            <Pagination
              total={data.total}
              page={data.page}
              size={data.size}
              basePath="/notifications"
            />
          </NotificationsClient>
        </div>
      )}
    </div>
  );
}