"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import Link from "next/link";
import { Heart, MessageCircle, CheckCheck, Bell, CheckCircle2, XCircle, AtSign, ClipboardList, Award, AlertTriangle, UserPlus, ChevronRight } from "lucide-react";
import { apiMarkRead, apiMarkAllRead, type NotificationsResponse, type NotificationItem } from "@/lib/api";
import { useUrlStyle } from "@/components/SiteBrandProvider";
import { postPath, userPath, commentAnchor } from "@/lib/urlStyle";

/**
 * 通知列表交互层：数据由服务端 SSR 直出，这里只承担已读标记等客户端操作。
 * 布局：左栏 sticky 概览（未读数/全部已读）+ 右列紧凑列表（单条两行内）。
 */
export default function NotificationsClient({
  initialData,
  initialUnread,
  children,
}: {
  initialData: NotificationsResponse;
  initialUnread: number;
  children?: React.ReactNode;
}) {
  const router = useRouter();
  const urlStyle = useUrlStyle();
  const [notifications, setNotifications] = useState<NotificationItem[]>(initialData.notifications || []);
  const [unreadCount, setUnreadCount] = useState(initialUnread);

  const handleClick = async (n: NotificationItem) => {
    if (!n.is_read) {
      apiMarkRead(n.id).catch(() => {});
      setNotifications((list) =>
        list.map((item) => (item.id === n.id ? { ...item, is_read: true } : item))
      );
      setUnreadCount((c) => Math.max(0, c - 1));
    }
    // @提及通知跳到群聊房间；徽章通知无关联帖子（仅标已读）；关注通知跳到关注者主页；其余跳到帖子/评论
    if (n.type === "mention" && n.room_id) {
      router.push(`/chat/${n.room_id}`);
    } else if (n.type === "pending_review") {
      router.push(n.post_id ? postPath(urlStyle, n.post_id) : "/admin/content?status=pending");
    } else if (n.type === "badge") {
      return;
    } else if (n.type === "follow") {
      router.push(userPath(urlStyle, n.actor_id));
    } else if (n.comment_id > 0 && n.comment_floor) {
      // 评论/回复/点赞等：直达评论所在楼层（跨页由帖子页深链定位换页）
      router.push(
        `${postPath(urlStyle, n.post_id)}${commentAnchor(n.comment_floor, n.comment_is_root ?? true, n.comment_id)}`
      );
    } else {
      router.push(postPath(urlStyle, n.post_id));
    }
  };

  const handleMarkAll = async () => {
    await apiMarkAllRead();
    setNotifications((list) => list.map((item) => ({ ...item, is_read: true })));
    setUnreadCount(0);
    // 同步刷新 Header 未读红点（layout 重新取 unread_count）
    router.refresh();
  };

  const formatTime = (dateStr: string) => {
    const diff = Date.now() - new Date(dateStr).getTime();
    const min = Math.floor(diff / 60000);
    if (min < 1) return "刚刚";
    if (min < 60) return `${min} 分钟前`;
    const hour = Math.floor(min / 60);
    if (hour < 24) return `${hour} 小时前`;
    return `${Math.floor(hour / 24)} 天前`;
  };

  const iconOf = (n: NotificationItem) => {
    const t = n.type;
    const node =
      t === "approved" ? <CheckCircle2 size={15} />
      : t === "rejected" || t === "deleted" ? <XCircle size={15} />
      : t === "necro_reply" ? <AlertTriangle size={15} />
      : t === "like" ? <Heart size={15} />
      : t === "mention" ? <AtSign size={15} />
      : t === "pending_review" ? <ClipboardList size={15} />
      : t === "badge" ? <Award size={15} />
      : t === "follow" ? <UserPlus size={15} />
      : <MessageCircle size={15} />;
    const color =
      t === "approved" ? "var(--ok)"
      : t === "rejected" || t === "deleted" || t === "necro_reply" ? "var(--danger)"
      : t === "like" ? "var(--clay)"
      : t === "badge" ? "var(--gold)"
      : "var(--accent)";
    const bg =
      t === "approved" ? "var(--ok-soft)"
      : t === "rejected" || t === "deleted" || t === "necro_reply" ? "var(--danger-soft)"
      : t === "like" ? "var(--clay-soft)"
      : t === "badge" ? "var(--gold-soft)"
      : "var(--accent-soft)";
    return { node, color, bg };
  };

  return (
    <>
      {/* 左栏：概览 + 全部已读（lg 起 sticky） */}
      <aside className="panel p-4 sm:p-5 lg:sticky lg:top-[var(--rail-top)]">
        <p className="text-xs font-bold tracking-widest uppercase" style={{ color: "var(--ink-3)" }}>概览</p>
        <div className="mt-2.5 flex items-baseline gap-1.5">
          <span
            className="text-[30px] leading-none font-extrabold"
            style={{ color: unreadCount > 0 ? "var(--accent)" : "var(--ink)", fontVariantNumeric: "tabular-nums" }}
          >
            {unreadCount}
          </span>
          <span className="meta">条未读</span>
        </div>
        <p className="meta mt-1.5">共 {initialData.total} 条通知</p>
        <div className="my-3.5" style={{ borderTop: "1px solid var(--line)" }} />
        {unreadCount > 0 ? (
          <button onClick={handleMarkAll} className="btn btn-line btn-sm w-full justify-center">
            <CheckCheck size={14} /> 全部已读
          </button>
        ) : (
          <p className="meta flex items-center gap-1.5" style={{ color: "var(--ok)" }}>
            <CheckCircle2 size={14} /> 通知都已读完
          </p>
        )}
      </aside>

      {/* 右列：紧凑通知列表 + 分页 */}
      <div className="min-w-0">
        {notifications.length === 0 ? (
          <div className="panel text-center py-16 px-6">
            <span
              className="inline-flex w-12 h-12 rounded-full items-center justify-center mb-3.5"
              style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
            >
              <Bell size={22} />
            </span>
            <p className="font-bold" style={{ color: "var(--ink)" }}>还没有通知</p>
            <p className="meta mt-1">当有人评论或点赞你的帖子时，会在这里提醒你</p>
          </div>
        ) : (
          <div className="panel overflow-hidden p-0">
            {notifications.map((n, i) => {
              const approval = n.type === "approved" || n.type === "rejected";
              // 系统提醒（ActorID=0）：不渲染操作者链接，仅展示标题与内容
              const system = n.type === "necro_reply";
              const icon = iconOf(n);
              return (
                <button
                  key={n.id}
                  onClick={() => handleClick(n)}
                  className="relative w-full text-left pl-4 pr-3 sm:pr-4 py-2.5 flex items-center gap-3 transition-colors hover:bg-[var(--item-hover-bg)] focus-visible:bg-[var(--item-hover-bg)]"
                  style={{
                    borderTop: i === 0 ? "none" : "1px solid var(--line)",
                  }}
                >
                  {/* 未读：左侧主题色竖条（已读透明占位，文本基线对齐不跳） */}
                  <span
                    aria-hidden
                    className="absolute left-0 top-2 bottom-2 w-[3px] rounded-full"
                    style={{ background: n.is_read ? "transparent" : "var(--accent)" }}
                  />
                  <span
                    className="w-[30px] h-[30px] shrink-0 rounded-[9px] flex items-center justify-center"
                    style={{ color: icon.color, background: icon.bg }}
                  >
                    {icon.node}
                  </span>
                  <div className="flex-1 min-w-0">
                    <p className="text-[13.5px] leading-snug flex items-baseline gap-x-1.5" style={{ color: "var(--ink)" }}>
                      {approval ? (
                        <span
                          className="font-bold shrink-0"
                          style={{ color: n.type === "approved" ? "var(--ok)" : "var(--danger)" }}
                        >
                          {n.type === "approved" ? "审核通过" : "未通过审核"}
                        </span>
                      ) : system ? (
                        <span className="font-bold shrink-0" style={{ color: "var(--danger)" }}>
                          旧帖回复提醒
                        </span>
                      ) : (
                        <>
                          <Link
                            href={userPath(urlStyle, n.actor.id)}
                            onClick={(e) => e.stopPropagation()}
                            className="font-semibold shrink-0 max-w-[10em] truncate hover:text-[var(--accent)] transition-colors"
                          >
                            {n.actor.nickname}
                          </Link>
                          <span className="meta shrink-0">
                            {n.type === "comment"
                              ? "评论了你的帖子"
                              : n.type === "reply"
                                ? "回复了你的评论"
                                : n.type === "mention"
                                  ? "在群中提到了你"
                                  : n.type === "pending_review"
                                    ? "有新内容待审核"
                                    : n.type === "deleted"
                                      ? "删除了你的帖子"
                                      : n.type === "badge"
                                        ? "向你颁布了徽章"
                                        : n.type === "follow"
                                          ? "关注了你"
                                          : "点赞了你的帖子"}
                          </span>
                        </>
                      )}
                      {n.type === "mention"
                        ? n.room && (
                            <span className="truncate min-w-0" style={{ color: "var(--ink-2)" }}>
                              # {n.room.name}
                            </span>
                          )
                        : n.post && (
                            <span className="truncate min-w-0" style={{ color: "var(--ink-2)" }}>
                              《{n.post.title}》
                            </span>
                          )}
                      <span className="meta text-xs shrink-0 ml-auto pl-2">{formatTime(n.created_at)}</span>
                    </p>
                    {n.content && (
                      <p className="text-[13px] mt-0.5 truncate" style={{ color: "var(--ink-3)" }}>
                        {n.content}
                      </p>
                    )}
                  </div>
                  {n.type === "follow" && (
                    <span
                      className="shrink-0 inline-flex items-center gap-0.5 text-xs font-semibold"
                      style={{ color: "var(--accent)" }}
                    >
                      查看主页 <ChevronRight size={13} />
                    </span>
                  )}
                </button>
              );
            })}
          </div>
        )}
        {children}
      </div>
    </>
  );
}