"use client";

import { useCallback, useRef, useState } from "react";
import Link from "next/link";
import { ArrowLeft, ExternalLink, FileText, MessageCircle, MessagesSquare } from "lucide-react";
import {
  apiAdminUserAuditComments,
  apiAdminUserAuditMessages,
  apiAdminUserAuditPosts,
  type AdminAuditCommentItem,
  type AdminAuditMessageItem,
  type AdminAuditPostItem,
  type AdminUserAuditProfile,
} from "@/lib/api";
import { formatDate, formatRelative } from "@/lib/format";
import Avatar from "@/components/Avatar";
import RoleBadge from "@/components/RoleBadge";
import {
  AdminEmpty,
  AdminPager,
  AdminSegmented,
  AdminStatusChip,
  type AdminStatusTone,
} from "@/components/admin";

type TabKey = "posts" | "comments" | "messages";

const PAGE_SIZE = 20;

/** 内容/消息状态粒：可叠加（如已删除 + 待审） */
function StatusChips({
  status,
  deleted,
  recalled,
}: {
  status?: string;
  deleted?: boolean;
  recalled?: boolean;
}) {
  const chips: { label: string; tone: AdminStatusTone }[] = [];
  if (deleted) chips.push({ label: "已删除", tone: "danger" });
  if (recalled) chips.push({ label: "已撤回", tone: "muted" });
  if (status === "pending") chips.push({ label: "待审", tone: "warn" });
  if (status === "rejected") chips.push({ label: "已驳回", tone: "danger" });
  if (status === "published" && !deleted) {
    chips.push({ label: "已发布", tone: "ok" });
  }
  if (chips.length === 0 && !recalled) {
    chips.push({ label: "正常", tone: "muted" });
  }
  return (
    <span className="inline-flex flex-wrap gap-1">
      {chips.map((c) => (
        <AdminStatusChip key={c.label} tone={c.tone}>
          {c.label}
        </AdminStatusChip>
      ))}
    </span>
  );
}

export default function UserAuditClient({
  userId,
  initial,
  initialPosts,
  initialPostsTotal,
  initError,
}: {
  userId: number;
  initial: AdminUserAuditProfile;
  initialPosts: AdminAuditPostItem[];
  initialPostsTotal: number;
  initError: string;
}) {
  const [profile] = useState(initial);
  const [tab, setTab] = useState<TabKey>("posts");
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState(initError);
  const [posts, setPosts] = useState(initialPosts);
  const [comments, setComments] = useState<AdminAuditCommentItem[]>([]);
  const [messages, setMessages] = useState<AdminAuditMessageItem[]>([]);
  const [postsTotal, setPostsTotal] = useState(initialPostsTotal);
  const [commentsTotal, setCommentsTotal] = useState(0);
  const [messagesTotal, setMessagesTotal] = useState(0);
  const [postsPage, setPostsPage] = useState(1);
  const [commentsPage, setCommentsPage] = useState(1);
  const [messagesPage, setMessagesPage] = useState(1);
  const loadSeq = useRef(0);
  const loadedRef = useRef({ posts: true, comments: false, messages: false });

  const u = profile.user;

  const loadPosts = useCallback(
    async (p: number) => {
      const seq = ++loadSeq.current;
      setLoading(true);
      try {
        const res = await apiAdminUserAuditPosts(userId, p);
        if (seq !== loadSeq.current) return;
        setPosts(res.items || []);
        setPostsTotal(res.total);
        setPostsPage(p);
        loadedRef.current.posts = true;
        setTab("posts");
        setError("");
      } catch (e) {
        if (seq !== loadSeq.current) return;
        setError(e instanceof Error ? e.message : "加载失败");
      } finally {
        if (seq === loadSeq.current) setLoading(false);
      }
    },
    [userId]
  );

  const loadComments = useCallback(
    async (p: number) => {
      const seq = ++loadSeq.current;
      setLoading(true);
      try {
        const res = await apiAdminUserAuditComments(userId, p);
        if (seq !== loadSeq.current) return;
        setComments(res.items || []);
        setCommentsTotal(res.total);
        setCommentsPage(p);
        loadedRef.current.comments = true;
        setTab("comments");
        setError("");
      } catch (e) {
        if (seq !== loadSeq.current) return;
        setError(e instanceof Error ? e.message : "加载失败");
      } finally {
        if (seq === loadSeq.current) setLoading(false);
      }
    },
    [userId]
  );

  const loadMessages = useCallback(
    async (p: number) => {
      const seq = ++loadSeq.current;
      setLoading(true);
      try {
        const res = await apiAdminUserAuditMessages(userId, p);
        if (seq !== loadSeq.current) return;
        setMessages(res.items || []);
        setMessagesTotal(res.total);
        setMessagesPage(p);
        loadedRef.current.messages = true;
        setTab("messages");
        setError("");
      } catch (e) {
        if (seq !== loadSeq.current) return;
        setError(e instanceof Error ? e.message : "加载失败");
      } finally {
        if (seq === loadSeq.current) setLoading(false);
      }
    },
    [userId]
  );

  const switchTab = (t: TabKey) => {
    if (t === tab) return;
    setError("");
    if (loadedRef.current[t]) {
      loadSeq.current += 1;
      setLoading(false);
      setTab(t);
      return;
    }
    if (t === "posts") void loadPosts(1);
    else if (t === "comments") void loadComments(1);
    else void loadMessages(1);
  };

  const goPage = (p: number) => {
    if (tab === "posts") void loadPosts(p);
    else if (tab === "comments") void loadComments(p);
    else void loadMessages(p);
  };

  const tabCount = (t: TabKey) => {
    if (t === "posts") return profile.posts_total;
    if (t === "comments") return profile.comments_total;
    return profile.messages_total;
  };

  const page = tab === "posts" ? postsPage : tab === "comments" ? commentsPage : messagesPage;
  const total = tab === "posts" ? postsTotal : tab === "comments" ? commentsTotal : messagesTotal;
  const empty =
    tab === "posts" ? posts.length === 0 : tab === "comments" ? comments.length === 0 : messages.length === 0;

  const emptyIcon =
    tab === "posts" ? (
      <FileText size={22} />
    ) : tab === "comments" ? (
      <MessageCircle size={22} />
    ) : (
      <MessagesSquare size={22} />
    );

  return (
    <div>
      <Link
        href="/admin/users"
        className="inline-flex items-center gap-1.5 text-[13px] mb-4 hover:opacity-80"
        style={{ color: "var(--accent)" }}
      >
        <ArrowLeft size={14} />
        返回用户列表
      </Link>

      <div className="panel p-4 sm:p-5 mb-4">
        <div className="flex items-start gap-3.5">
          <Avatar name={u.nickname || u.username} src={u.avatar || undefined} size={48} />
          <div className="min-w-0 flex-1">
            <div className="flex items-center gap-2 flex-wrap">
              <h1
                className="text-[18px] sm:text-[20px] font-extrabold truncate"
                style={{ color: "var(--ink)" }}
              >
                {u.nickname}
              </h1>
              <RoleBadge role={u.role} />
              {u.banned && <AdminStatusChip tone="danger">已封禁</AdminStatusChip>}
            </div>
            <p className="meta text-[12.5px] mt-0.5 truncate">@{u.username}</p>
            <p className="meta text-[12px] mt-2">
              注册于 {formatDate(u.created_at)} · 已发布帖 {profile.published_posts} / 评{" "}
              {profile.published_comments}
            </p>
          </div>
          <Link
            href={`/u/${u.id}`}
            className="btn btn-line btn-sm gap-1.5 shrink-0"
            target="_blank"
          >
            <ExternalLink size={13} />
            主页
          </Link>
        </div>
        <div
          className="mt-4 grid grid-cols-3 gap-2 sm:gap-3 pt-4"
          style={{ borderTop: "1px solid var(--line)" }}
        >
          {[
            { label: "全部帖子", value: profile.posts_total },
            { label: "全部评论", value: profile.comments_total },
            { label: "全部消息", value: profile.messages_total },
          ].map((c) => (
            <div key={c.label} className="text-center">
              <p
                className="text-[20px] font-extrabold tabular-nums leading-none"
                style={{ color: "var(--ink)" }}
              >
                {c.value.toLocaleString("zh-CN")}
              </p>
              <p className="meta text-[11.5px] mt-1.5">{c.label}</p>
            </div>
          ))}
        </div>
      </div>

      <div className="panel overflow-hidden">
        <div className="admin-toolbar">
          <AdminSegmented<TabKey>
            ariaLabel="内容分类"
            value={tab}
            onChange={switchTab}
            options={[
              {
                key: "posts",
                label: "帖子",
                icon: <FileText size={14} />,
                count: tabCount("posts"),
              },
              {
                key: "comments",
                label: "评论",
                icon: <MessageCircle size={14} />,
                count: tabCount("comments"),
              },
              {
                key: "messages",
                label: "私信与群消息",
                icon: <MessagesSquare size={14} />,
                count: tabCount("messages"),
              },
            ]}
          />
        </div>

        {error && (
          <p className="text-center py-10 text-[13px]" style={{ color: "var(--danger)" }}>
            {error}
          </p>
        )}
        {!error && empty && <AdminEmpty icon={emptyIcon} title="该分类暂无内容" />}

        {tab === "posts" &&
          posts.map((p) => (
            <div
              key={p.id}
              className="px-4 sm:px-5 py-3.5"
              style={{ borderTop: "1px solid var(--line)" }}
            >
              <div className="flex items-start justify-between gap-3">
                <div className="min-w-0 flex-1">
                  <div className="flex items-center gap-2 flex-wrap mb-1">
                    <StatusChips status={p.status} deleted={p.deleted} />
                    {p.board_name && (
                      <span className="text-[11.5px] meta truncate">{p.board_name}</span>
                    )}
                  </div>
                  {p.deleted ? (
                    <p className="text-[14px] font-medium" style={{ color: "var(--ink-3)" }}>
                      {p.title || "（无标题）"}
                    </p>
                  ) : (
                    <Link
                      href={`/post/${p.id}`}
                      className="text-[14px] font-medium hover:underline"
                      style={{ color: "var(--ink)" }}
                    >
                      {p.title || "（无标题）"}
                    </Link>
                  )}
                  {p.content && (
                    <p className="meta text-[12.5px] mt-1 line-clamp-2 leading-relaxed">
                      {p.content}
                    </p>
                  )}
                </div>
                <span className="shrink-0 text-[11.5px] meta tabular-nums">
                  {formatRelative(p.created_at)}
                </span>
              </div>
            </div>
          ))}

        {tab === "comments" &&
          comments.map((c) => (
            <div
              key={c.id}
              className="px-4 sm:px-5 py-3.5"
              style={{ borderTop: "1px solid var(--line)" }}
            >
              <div className="flex items-start justify-between gap-3">
                <div className="min-w-0 flex-1">
                  <div className="flex items-center gap-2 flex-wrap mb-1">
                    <StatusChips status={c.status} deleted={c.deleted} />
                    {c.deleted ? (
                      <span className="text-[11.5px] meta">帖子 #{c.post_id}</span>
                    ) : (
                      <Link
                        href={`/post/${c.post_id}#comment-${c.id}`}
                        className="text-[11.5px] hover:underline"
                        style={{ color: "var(--accent)" }}
                      >
                        帖子 #{c.post_id}
                      </Link>
                    )}
                  </div>
                  <p
                    className="text-[13.5px] leading-relaxed whitespace-pre-wrap break-words"
                    style={{ color: c.deleted ? "var(--ink-3)" : "var(--ink)" }}
                  >
                    {c.content || "（空）"}
                  </p>
                </div>
                <span className="shrink-0 text-[11.5px] meta tabular-nums">
                  {formatRelative(c.created_at)}
                </span>
              </div>
            </div>
          ))}

        {tab === "messages" &&
          messages.map((m) => (
            <div
              key={m.id}
              className="px-4 sm:px-5 py-3.5"
              style={{ borderTop: "1px solid var(--line)" }}
            >
              <div className="flex items-start justify-between gap-3">
                <div className="min-w-0 flex-1">
                  <div className="flex items-center gap-2 flex-wrap mb-1">
                    <StatusChips deleted={m.deleted} recalled={m.recalled} />
                    <span className="text-[11.5px] meta truncate">
                      {m.room_name}
                      {m.room_type === "direct" ? " · 私聊" : m.room_type === "group" ? " · 群聊" : ""}
                    </span>
                  </div>
                  <p
                    className="text-[13.5px] leading-relaxed whitespace-pre-wrap break-words"
                    style={{
                      color: m.recalled || m.deleted ? "var(--ink-3)" : "var(--ink)",
                      fontStyle: m.recalled ? "italic" : undefined,
                    }}
                  >
                    {m.content || "（空）"}
                  </p>
                </div>
                <span className="shrink-0 text-[11.5px] meta tabular-nums">
                  {formatRelative(m.created_at)}
                </span>
              </div>
            </div>
          ))}

        <AdminPager
          page={page}
          total={total}
          pageSize={PAGE_SIZE}
          loading={loading}
          onChange={goPage}
        />
      </div>
    </div>
  );
}