import type { Metadata } from "next";
import { cookies } from "next/headers";
import { fetchSnippets, fetchSnippetLanguages, fetchSnippetStats, type SnippetStats } from "@/lib/api";
import { getMeCached, getPublicSettingsCached } from "@/lib/serverData";
import { authCookieHeader } from "@/lib/cookies";
import { requestCanonical } from "@/lib/canonicalMeta";
import { snippetsPath } from "@/lib/urlStyle";
import SnippetExplorer from "@/components/SnippetExplorer";

export async function generateMetadata(): Promise<Metadata> {
  const settings = await getPublicSettingsCached();
  return {
    title: "代码片段",
    description: settings.site_description,
    ...(await requestCanonical(snippetsPath(settings.url_style))),
  };
}

export default async function SnippetsPage() {
  const settings = await getPublicSettingsCached();

  // 登录态由服务端判定后下发：客户端组件内再读 cookie 会造成 hydration 不一致。
  // getMeCached 与 layout 同参调用，命中 React cache 不额外请求后端。
  const cookie = authCookieHeader(await cookies());
  const isLoggedIn = !!(await getMeCached(cookie || undefined)).user;

  let initialItems: Awaited<ReturnType<typeof fetchSnippets>>["items"] = [];
  let initialTotal = 0;
  let languages: string[] = [];
  let stats: SnippetStats | null = null;
  try {
    const [listRes, langRes, statsRes] = await Promise.all([
      fetchSnippets({ size: 12 }),
      fetchSnippetLanguages(),
      fetchSnippetStats(),
    ]);
    initialItems = listRes.items;
    initialTotal = listRes.total;
    languages = langRes.languages;
    stats = statsRes;
  } catch {
    /* 降级空态 */
  }

  return (
    <div className="min-w-0 pt-5 sm:pt-7">
      <SnippetExplorer
        initialItems={initialItems}
        initialTotal={initialTotal}
        languages={languages}
        urlStyle={settings.url_style}
        stats={stats}
        isLoggedIn={isLoggedIn}
      />
    </div>
  );
}