import { NavLink, Outlet, useLocation, useNavigate, Navigate } from "react-router-dom";
import { QrCode, Package, ArrowLeft, LayoutDashboard, Smartphone, GitBranch, LogOut, User, Users, BarChart3, Table2, Tv, ScrollText, ShieldCheck } from "lucide-react";
import { useAuth } from "../../contexts/AuthContext";

const MENU = [
  {
    title: "全局概览",
    path: "/admin/dashboard",
    icon: LayoutDashboard,
    description: "生产数据总览 · 产品 + 任务统计",
  },
  {
    title: "产品管理",
    path: "/admin/products",
    icon: Package,
    description: "创建产品 · 生成二维码 · 打印标签",
  },
  {
    title: "任务全景",
    path: "/admin/tasks",
    icon: GitBranch,
    description: "身份证查任务树 · 裂变/返工可视化",
  },
  {
    title: "人员看板",
    path: "/admin/people",
    icon: Users,
    description: "按负责人查看在制品设备分布",
  },
  {
    title: "效能分析",
    path: "/admin/analytics",
    icon: BarChart3,
    description: "人员效能 / 设备流转 ECharts 可视化",
  },
  {
    title: "WIP 分布矩阵",
    path: "/admin/matrix",
    icon: Table2,
    description: "规格型号 × 人员/工序 在制品透视表",
  },
  {
    title: "业务分组",
    path: "/admin/groups",
    icon: ShieldCheck,
    description: "生产组 / 维修组 · 决定成员可见的数据范围",
  },
  {
    title: "操作审计",
    path: "/admin/audit",
    icon: ScrollText,
    description: "谁在何时操作了什么 · 含失败与被拒请求",
  },
  {
    title: "管理层大屏",
    path: "/admin/screen",
    icon: Tv,
    description: "全屏数据大盘 · 直通率 / 产量趋势 / 不良分布",
  },
];

export default function AdminLayout() {
  const location = useLocation();
  const navigate = useNavigate();
  const { user, logout, isAuthenticated, loading } = useAuth();

  // 数据范围徽标 —— 让用户看得见「我为什么只看到这些」。
  // 空范围（未分组）必须显眼：列表全空却没有任何提示，用户会以为系统坏了，
  // 这是最难排查的一类反馈。
  const scope = user?.scope;
  const scopeBadge = !scope
    ? null
    : scope.is_empty
      ? {
          text: "未分组 · 暂无数据权限",
          cls: "bg-orange-50 text-orange-600",
          tip: "你未被分入任何业务组，列表会是空的。请联系管理员把你分配到对应分组。",
        }
      : scope.is_unrestricted
        ? { text: "全厂", cls: "bg-gray-100 text-gray-500", tip: "可查看全部数据" }
        : {
            text: `${scope.groups.join(" / ") || "已分组"} · ${scope.phase_labels.join(" / ")}`,
            cls: "bg-blue-50 text-blue-600",
            tip: `可见数据范围：${scope.phase_labels.join("、")}`,
          };

  // 认证加载中
  if (loading) {
    return (
      <div className="flex min-h-screen items-center justify-center bg-gray-50">
        <div className="h-8 w-8 animate-spin rounded-full border-2 border-blue-500 border-t-transparent" />
      </div>
    );
  }

  // 未登录 → 跳转登录页
  if (!isAuthenticated) {
    return <Navigate to="/admin/login" replace />;
  }

  async function handleLogout() {
    // 必须 await：logout() 要先完成审计上报再清 token，
    // 提前 navigate 会把请求掐断，退出就留不下痕
    await logout();
    navigate("/admin/login", { replace: true });
  }

  return (
    <div className="flex min-h-screen bg-gray-50">
      {/* 侧边栏 */}
      <aside className="fixed left-0 top-0 z-40 flex h-screen w-56 flex-col border-r border-gray-200 bg-white">
        <div className="flex items-center gap-2 border-b border-gray-100 px-5 py-4">
          <QrCode className="h-5 w-5 text-blue-600" />
          <span className="text-sm font-bold text-gray-800">生产流转 · 管理端</span>
        </div>

        <nav className="flex-1 space-y-0.5 px-3 py-4">
          {MENU.map((item) => {
            const isActive = location.pathname.startsWith(item.path);
            return (
              <NavLink
                key={item.path}
                to={item.path}
                className={`flex items-start gap-3 rounded-lg px-3 py-2.5 transition-colors ${
                  isActive ? "bg-blue-50 text-blue-700" : "text-gray-600 hover:bg-gray-100"
                }`}
              >
                <item.icon className={`mt-0.5 h-4 w-4 shrink-0 ${isActive ? "text-blue-600" : "text-gray-400"}`} />
                <div>
                  <p className="text-sm font-medium">{item.title}</p>
                  <p className="text-xs text-gray-400">{item.description}</p>
                </div>
              </NavLink>
            );
          })}
        </nav>

        <div className="space-y-1 border-t border-gray-100 px-5 py-3">
          <a
            href="/scan"
            className="flex items-center gap-1.5 rounded-md px-2 py-1.5 text-xs font-medium text-green-600 transition-colors hover:bg-green-50"
          >
            <Smartphone className="h-3.5 w-3.5" />
            模拟手机扫码
          </a>
          <a
            href="/"
            className="flex items-center gap-1.5 rounded-md px-2 py-1.5 text-xs text-gray-400 transition-colors hover:text-gray-600"
          >
            <ArrowLeft className="h-3.5 w-3.5" />
            移动端首页
          </a>
        </div>
      </aside>

      <main className="ml-56 flex-1">
        <div className="sticky top-0 z-30 flex items-center justify-between border-b border-gray-200 bg-white px-6 py-3">
          <div className="flex items-center gap-2 text-xs text-gray-400">
            <LayoutDashboard className="h-3 w-3" />
            <span>管理端</span>
            <span>/</span>
            <span className="font-medium text-gray-600">
              {MENU.find((m) => location.pathname.startsWith(m.path))?.title ?? "页面"}
            </span>
          </div>

          {/* 数据范围 + 用户信息 + 登出 */}
          <div className="flex items-center gap-3">
            {scopeBadge && (
              <span
                className={`rounded px-2 py-0.5 text-xs ${scopeBadge.cls}`}
                title={scopeBadge.tip}
              >
                {scopeBadge.text}
              </span>
            )}
            {scope?.is_leader && (
              <span className="rounded bg-emerald-50 px-1.5 py-0.5 text-xs text-emerald-600" title="你是某个业务组的组长">
                组长
              </span>
            )}
            <div className="flex items-center gap-1.5 text-xs text-gray-500">
              <User className="h-3.5 w-3.5" />
              <span className="font-medium text-gray-700">
                {user?.display_name ?? user?.username ?? "—"}
              </span>
            </div>
            <button
              onClick={handleLogout}
              className="flex items-center gap-1 rounded-md px-2 py-1 text-xs text-gray-400 transition-colors hover:bg-red-50 hover:text-red-600"
            >
              <LogOut className="h-3 w-3" />
              退出
            </button>
          </div>
        </div>
        <div className="p-6">
          <Outlet />
        </div>
      </main>
    </div>
  );
}