import type { Metadata } from "next";
import { cookies } from "next/headers";
import { authCookieHeader } from "@/lib/cookies";
import {
  fetchAdminContentCounts,
  fetchAdminContentPosts,
  fetchAdminContentComments,
  type AdminContentComment,
  type AdminContentPost,
  type AdminContentStatus,
} from "@/lib/api";
import { getMeCached } from "@/lib/serverData";
import { canModerateAny, isOwner } from "@/lib/roles";
import Forbidden from "../Forbidden";
import ContentAdmin, { type ContentKind } from "./ContentAdmin";

export const metadata: Metadata = {
  title: "内容管理",
};

const STATUSES: AdminContentStatus[] = ["live", "published", "pending", "rejected", "deleted"];

function parseStatus(v?: string): AdminContentStatus {
  return v && STATUSES.includes(v as AdminContentStatus) ? (v as AdminContentStatus) : "live";
}

function parseKind(v?: string): ContentKind {
  if (v === "comments") return "comments";
  return "posts";
}

interface ContentPageProps {
  searchParams: Promise<{ status?: string; kind?: string }>;
}

export default async function AdminContentPage({ searchParams }: ContentPageProps) {
  const sp = await searchParams;
  const initialStatus = parseStatus(sp.status);
  const initialKind = parseKind(sp.kind);

  const cookie = authCookieHeader(await cookies());
  const me = await getMeCached(cookie || undefined);
  if (!me.user || !canModerateAny(me.user)) {
    return <Forbidden text="你所在的角色没有内容管理权限，或尚未被授权任何板块。" />;
  }

  let initialPosts: AdminContentPost[] = [];
  let initialPostsTotal = 0;
  let initialComments: AdminContentComment[] = [];
  let initialCommentsTotal = 0;
  let initError = "";

  // PC 双栏同时展示：SSR 并行预取帖子与评论
  const [postsSettled, commentsSettled, counts] = await Promise.all([
    fetchAdminContentPosts(1, initialStatus, cookie || undefined)
      .then((res) => ({ ok: true as const, res }))
      .catch((e) => ({
        ok: false as const,
        error: e instanceof Error ? e.message : "获取帖子失败",
      })),
    fetchAdminContentComments(1, initialStatus, cookie || undefined)
      .then((res) => ({ ok: true as const, res }))
      .catch((e) => ({
        ok: false as const,
        error: e instanceof Error ? e.message : "获取评论失败",
      })),
    fetchAdminContentCounts(cookie || undefined),
  ]);

  if (postsSettled.ok) {
    initialPosts = postsSettled.res.posts;
    initialPostsTotal = postsSettled.res.total;
  } else {
    initError = postsSettled.error;
  }
  if (commentsSettled.ok) {
    initialComments = commentsSettled.res.comments;
    initialCommentsTotal = commentsSettled.res.total;
  } else if (!initError) {
    initError = commentsSettled.error;
  }

  return (
    <ContentAdmin
      key={`${initialKind}-${initialStatus}`}
      initialKind={initialKind}
      initialStatus={initialStatus}
      initialPosts={initialPosts}
      initialPostsTotal={initialPostsTotal}
      initialComments={initialComments}
      initialCommentsTotal={initialCommentsTotal}
      initialCounts={counts}
      initError={initError}
      canPurge={isOwner(me.user.role)}
      viewerRole={me.user.role}
    />
  );
}