"use client";

import Link from "next/link";
import { usePathname } from "next/navigation";
import { useCallback } from "react";

import type { ReactNode } from "react";

import {
  AdminIcon,
  AgentIcon,
  AuditIcon,
  GoalIcon,
  MemoryIcon,
  PerceptionIcon,
  PlanIcon,
  TenantIcon,
  ToolsIcon,
  TraceIcon,
  UserIcon,
  WorldIcon,
} from "@/components/ui/Icons";
import { cn } from "@/lib/utils/cn";

type AdminNavItem = { href: string; label: string; icon: ReactNode };

/**
 * 司命台治理导航（横向 — 设计稿 topbar-nav）。
 */
const ADMIN_NAV: AdminNavItem[] = [
  { href: "/admin", label: "概览", icon: <AdminIcon /> },
  { href: "/admin/audit", label: "起居注", icon: <AuditIcon /> },
  { href: "/admin/traces", label: "链路追踪", icon: <TraceIcon /> },
  { href: "/admin/users", label: "用户管理", icon: <UserIcon /> },
  { href: "/admin/tenants", label: "多租户", icon: <TenantIcon /> },
  {
    href: "/admin/characters/templates",
    label: "人物模板",
    icon: <AdminIcon />,
  },
];

/** 九枢治理导航（设计稿 pivot nav）。与 pivots/[pivot] 路由对齐 */
const PIVOT_NAV: AdminNavItem[] = [
  { href: "/admin/goals", label: "太一", icon: <GoalIcon /> },
  { href: "/admin/safety", label: "司命", icon: <AdminIcon /> },
  { href: "/admin/perception", label: "烛照", icon: <PerceptionIcon /> },
  { href: "/admin/world", label: "河图", icon: <WorldIcon /> },
  { href: "/admin/plans", label: "洛书", icon: <PlanIcon /> },
  { href: "/admin/memory", label: "息壤", icon: <MemoryIcon /> },
  { href: "/admin/tools", label: "百工", icon: <ToolsIcon /> },
  { href: "/admin/agents", label: "天工阁", icon: <AgentIcon /> },
];

/**
 * 司命台外壳：独立冷色壳层（admin-shell → slate 色温分化）。
 * 设计稿 admin-preview.html §4 AdminShell 完全对齐。
 *
 * 壳层特性：
 * - 独立冷色 CSS 变量（.admin-shell 激活 `--slate` 色系）
 * - 顶部横向双层导航（治理 nav + 九枢 pivot nav）
 * - 主题切换 + 返回主域入口
 * - iOS safe-area 适配
 */
export function AdminShell({ children }: { children: ReactNode }) {
  const pathname = usePathname();

  /** 设计稿 toggleTheme — 通过触发表单更改 / 自定义事件 */
  const toggleTheme = useCallback(() => {
    const root = document.documentElement;
    const isDark = root.classList.contains("dark");
    if (isDark) {
      root.classList.remove("dark");
    } else {
      root.classList.add("dark");
    }
    // 持久化到 settings
    try {
      const raw = localStorage.getItem("hunjing-settings");
      if (raw) {
        const parsed = JSON.parse(raw);
        if (parsed.state) {
          parsed.state.theme = isDark ? "light" : "dark";
          localStorage.setItem("hunjing-settings", JSON.stringify(parsed));
        }
      }
    } catch {
      // silent
    }
  }, []);

  const navItemClass = (href: string, opts?: { pivot?: boolean }) =>
    cn(
      "inline-flex items-center gap-1.5 rounded-lg px-2.5 py-1.5 text-sm font-medium transition-colors shrink-0",
      opts?.pivot ? "text-xs" : "text-sm",
      pathname === href || pathname.startsWith(`${href}/`)
        ? "bg-patina-wash text-patina"
        : "text-muted hover:bg-overlay-hover hover:text-fg",
    );

  return (
    <div className="relative flex min-h-screen flex-col admin-shell">
      <header
        className="sticky top-0 z-30 flex flex-wrap items-center gap-2 border-b px-4 py-2.5 md:gap-3 md:px-6"
        style={{
          background: "var(--glass)",
          backdropFilter: "blur(16px) saturate(140%)",
          borderColor: "var(--rule)",
          paddingLeft: "calc(1rem + env(safe-area-inset-left, 0px))",
          paddingRight: "calc(1rem + env(safe-area-inset-right, 0px))",
        }}
      >
        {/* 品牌标志 — 设计稿 topbar-brand */}
        <Link
          href="/admin"
          className="flex items-center gap-1.5 font-serif text-base font-bold tracking-wide text-fg shrink-0"
          style={{ letterSpacing: "0.06em" }}
        >
          {/* 设计稿 SVG knob：描边铜镜无极标记 */}
          <svg
            className="shrink-0"
            width="16"
            height="16"
            viewBox="0 0 24 24"
            fill="none"
            stroke="currentColor"
            strokeWidth="1.6"
            strokeLinecap="round"
            strokeLinejoin="round"
          >
            <circle cx="12" cy="12" r="8.5" />
            <circle cx="12" cy="12" r="4.5" opacity="0.45" />
            <circle
              cx="12"
              cy="12"
              r="1.6"
              stroke="none"
              fill="var(--cinnabar)"
            />
          </svg>
          司命台
        </Link>

        {/* 分隔符 */}
        <span className="shrink-0 text-fg-faint opacity-50 select-none">/</span>

        {/* 司命治理导航 — 设计稿 topbar-nav */}
        <nav
          aria-label="司命台导航"
          className="order-3 flex w-full items-center gap-0.5 overflow-x-auto md:order-none md:w-auto md:flex-shrink"
        >
          {ADMIN_NAV.map((item) => (
            <Link
              key={item.href}
              href={item.href}
              className={navItemClass(item.href)}
            >
              {item.label}
            </Link>
          ))}
        </nav>

        {/* 九枢分隔 + 导航 — 设计稿中金色竖线 | 分隔 */}
        <span className="mx-1 hidden shrink-0 select-none text-fg-faint opacity-40 md:inline">
          |
        </span>
        <nav
          aria-label="九枢导航"
          className="order-4 flex w-full items-center gap-0.5 overflow-x-auto md:order-none md:w-auto"
        >
          {PIVOT_NAV.map((item) => (
            <Link
              key={item.href}
              href={item.href}
              className={navItemClass(item.href, { pivot: true })}
            >
              {item.label}
            </Link>
          ))}
        </nav>

        {/* 弹性间隔 */}
        <span className="flex-1 min-w-0" />

        {/* 返回主域 — 设计稿 topbar-back */}
        <Link
          href="/trees"
          className="flex shrink-0 items-center gap-1 rounded-lg px-2 py-1 text-xs font-medium text-muted transition-colors hover:bg-overlay-hover hover:text-fg"
          title="返回主域"
        >
          <svg
            width="12"
            height="12"
            viewBox="0 0 16 16"
            fill="none"
            aria-hidden
          >
            <path
              d="M10 4l-4 4 4 4"
              stroke="currentColor"
              strokeWidth="1.4"
              strokeLinecap="round"
              strokeLinejoin="round"
            />
          </svg>
          主域
        </Link>

        {/* 主题切换 — 设计稿 topbar-back 风格 */}
        <button
          type="button"
          onClick={toggleTheme}
          className="flex shrink-0 items-center gap-1 rounded-lg px-2 py-1 text-xs font-medium text-muted transition-colors hover:bg-overlay-hover hover:text-fg"
          title="切换主题"
        >
          <svg
            width="13"
            height="13"
            viewBox="0 0 16 16"
            fill="none"
            stroke="currentColor"
            strokeWidth="1.3"
            strokeLinecap="round"
          >
            <circle cx="8" cy="8" r="3" />
            <path d="M8 1v2M8 13v2M2 8h2M12 8h2M3.5 3.5l1.5 1.5M11 11l1.5 1.5M3.5 12.5l1.5-1.5M11 5l1.5-1.5" />
          </svg>
          <span id="theme-label-admin">{/* 客户端渲染时显示当前主题 */}</span>
        </button>
      </header>

      <main className="flex min-h-0 flex-1 flex-col overflow-hidden">
        {children}
      </main>
    </div>
  );
}