"use client";

import Link from "next/link";
import { useSearchParams } from "next/navigation";
import { PenSquare, Home, LayoutGrid, ShieldCheck } from "lucide-react";
import type { BoardWithCount, User } from "@/lib/api";
import { isStaff } from "@/lib/roles";
import BoardIcon, { boardColor } from "@/components/BoardIcon";

// 首页壳内板块切换：仅替换中栏帖子流，不离开工作台
function boardHref(id: number) {
  return `/?board=${id}`;
}

// 板块目录裸面板：只有 j13-module 本体，不含外层 nav / 宽度 / sticky 类，
// 供侧栏注册表按管理端配置在任意侧栏渲染。
export function WorkspaceNavPanel({
  boards,
  user,
}: {
  boards: BoardWithCount[];
  user?: User | null;
}) {
  const params = useSearchParams();
  const activeBoard = Number(params.get("board")) || 0;
  const showAdmin = !!user && isStaff(user.role);

  return (
    <section className="j13-module flex max-h-[var(--rail-max-h)] flex-col overflow-hidden" aria-label="板块目录">
      <p className="j13-module-title shrink-0">
        <LayoutGrid size={15} style={{ color: "var(--accent)" }} aria-hidden />
        板块目录
        {boards.length > 0 ? (
          <span className="ml-auto meta text-[11.5px] font-medium tracking-normal tabular-nums">
            {boards.length} 个
          </span>
        ) : null}
      </p>

      <div className="j13-rail-scroll j13-board-list mt-2.5 min-h-0 flex-1">
        <Link
          href="/"
          className="j13-bcard"
          aria-current={activeBoard === 0 ? "page" : undefined}
        >
          <span
            className="j13-bcard-ico"
            style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
            aria-hidden="true"
          >
            <Home size={15} />
          </span>
          <span className="j13-bcard-name flex-1 truncate">全部讨论</span>
        </Link>

        {boards.length > 0 ? <div className="j13-board-split" role="separator" /> : null}

        {boards.map((b) => (
          <Link
            key={b.id}
            href={boardHref(b.id)}
            className="j13-bcard"
            aria-current={activeBoard === b.id ? "page" : undefined}
            aria-label={`${b.name}板块，${b.post_count} 篇讨论`}
          >
            <span className={`av-${boardColor(b)} j13-bcard-ico`} aria-hidden="true">
              <BoardIcon icon={b.icon} name={b.name} size={15} />
            </span>
            <span className="min-w-0 flex-1 flex items-center justify-between gap-2">
              <span className="j13-bcard-name truncate">{b.name}</span>
              <span className="meta shrink-0 text-[11px] tabular-nums">{b.post_count} 篇</span>
            </span>
          </Link>
        ))}
      </div>

      {showAdmin ? (
        <div className="shrink-0 mt-1.5 pt-1.5" style={{ borderTop: "1px solid var(--line)" }}>
          <Link href="/admin" className="j13-bcard">
            <span
              className="j13-bcard-ico"
              style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
              aria-hidden="true"
            >
              <ShieldCheck size={15} />
            </span>
            <span className="j13-bcard-name flex-1 truncate">管理面板</span>
          </Link>
        </div>
      ) : null}
    </section>
  );
}

// 桌面左栏：整块模块，与右栏 j13-module 对齐
export function WorkspaceNav({ boards, user }: { boards: BoardWithCount[]; user?: User | null }) {
  return (
    // sticky 必须挂在 flex 子项上：父级 items-start 会把内层缩成内容高，失去粘滞行程
    <nav
      className="hidden lg:block w-56 xl:w-60 shrink-0 sticky top-[var(--rail-top)] max-h-[var(--rail-max-h)]"
      aria-label="工作台导航"
    >
      <WorkspaceNavPanel boards={boards} user={user} />
    </nav>
  );
}

// 移动端：发帖入口 + 横向滑动板块条
export function WorkspaceNavMobile({
  boards,
  user,
}: {
  boards: BoardWithCount[];
  user: User | null;
}) {
  const params = useSearchParams();
  const activeBoard = Number(params.get("board")) || 0;
  const composePath =
    activeBoard > 0 ? `/compose?board=${activeBoard}` : "/compose";
  const composeHref = user
    ? composePath
    : `/login?redirect=${encodeURIComponent(composePath)}`;

  return (
    <div className="lg:hidden -mx-4 sm:-mx-6 px-4 sm:px-6">
      <div className="j13-chips">
        <Link href={composeHref} className="btn btn-primary btn-sm shrink-0">
          <PenSquare size={14} /> 发帖
        </Link>
        <Link
          href="/"
          className="j13-chip"
          aria-current={activeBoard === 0 ? "page" : undefined}
        >
          <Home size={13} /> 全部
        </Link>
        {boards.map((b) => (
          <Link
            key={b.id}
            href={boardHref(b.id)}
            className="j13-chip"
            aria-current={activeBoard === b.id ? "page" : undefined}
          >
            <BoardIcon icon={b.icon} name={b.name} size={13} />
            {b.name}
          </Link>
        ))}
      </div>
    </div>
  );
}