import { Link, Outlet, useLocation } from "@remix-run/react";
import {
  LayoutDashboard,
  ClipboardList,
  Store,
  Users,
  Package,
  Tags,
  Ticket,
  LayoutGrid,
  Landmark,
  LayoutTemplate,
  Bell,
  Activity,
  MessageSquareWarning,
  ScrollText,
  ArrowRight,
  ShieldCheck,
  Loader2,
} from "lucide-react";
import type { LucideIcon } from "lucide-react";
import { useRequireAdmin } from "~/hooks/useRequireAdmin";

interface NavItem {
  label: string;
  to: string;
  icon: LucideIcon;
  exact?: boolean;
  soon?: boolean; // planned but not built yet
}

const NAV: NavItem[] = [
  { label: "نمای کلی", to: "/admin", icon: LayoutDashboard, exact: true },
  { label: "سفارش‌ها", to: "/admin/orders", icon: ClipboardList },
  { label: "فروشگاه‌ها", to: "/admin/sellers", icon: Store },
  { label: "کاربران", to: "/admin/users", icon: Users },
  { label: "محصولات", to: "/admin/products", icon: Package },
  { label: "ویژگی‌ها", to: "/admin/catalog", icon: Tags },
  { label: "تخفیف‌ها", to: "/admin/discounts", icon: Ticket },
  { label: "مجموعه‌ها", to: "/admin/collections", icon: LayoutGrid },
  { label: "دفتر مالی", to: "/admin/ledger", icon: Landmark },
  { label: "صفحه اصلی", to: "/admin/homepage", icon: LayoutTemplate },
  { label: "اعلان‌ها", to: "/admin/notifications", icon: Bell },
  { label: "سلامت AI", to: "/admin/ai-health", icon: Activity },
  { label: "مدیریت محتوا", to: "/admin/moderation", icon: MessageSquareWarning },
  { label: "گزارش فعالیت", to: "/admin/audit", icon: ScrollText },
];

export default function AdminLayout() {
  const location = useLocation();
  const { isLoading, isAdmin } = useRequireAdmin();

  const isActive = (item: NavItem) =>
    item.exact
      ? location.pathname === item.to
      : location.pathname.startsWith(item.to);

  if (isLoading || !isAdmin) {
    return (
      <div className="flex min-h-[60vh] items-center justify-center">
        <Loader2 className="h-7 w-7 animate-spin text-GRAY" />
      </div>
    );
  }

  const NavLinks = ({ onNavigate }: { onNavigate?: () => void }) => (
    <>
      {NAV.map((n) => {
        const active = isActive(n);
        const cls = `flex items-center gap-3 px-3.5 py-3 rounded-xl text-[14.5px] font-semibold transition-colors ${
          active ? "bg-BLACK text-white" : "text-BLACK2 hover:bg-WHITE2"
        } ${n.soon ? "opacity-45 cursor-not-allowed" : ""}`;
        const inner = (
          <>
            <n.icon size={20} />
            {n.label}
            {n.soon && (
              <span className="ms-auto text-[10px] text-GRAY font-normal">
                به‌زودی
              </span>
            )}
          </>
        );
        return n.soon ? (
          <div key={n.to} className={cls} aria-disabled>
            {inner}
          </div>
        ) : (
          <Link
            key={n.to}
            to={n.to}
            prefetch="intent"
            onClick={onNavigate}
            className={cls}
          >
            {inner}
          </Link>
        );
      })}
      <Link
        to="/"
        className="flex items-center gap-3 px-3.5 py-3 rounded-xl text-[14.5px] font-semibold text-BLACK2 hover:bg-WHITE2 transition-colors"
      >
        <ArrowRight size={20} />
        بازگشت به سایت
      </Link>
    </>
  );

  return (
    <div className="lg:max-w-[1440px] lg:mx-auto lg:w-full lg:px-8 lg:py-8 lg:grid lg:grid-cols-[248px_1fr] lg:gap-7 lg:items-start">
      {/* Desktop sidebar */}
      <aside className="hidden lg:block lg:sticky lg:top-6 border border-WHITE3 rounded-2xl overflow-hidden">
        <div className="p-4 border-b border-WHITE3 flex items-center gap-3">
          <div className="h-10 w-10 rounded-xl bg-BLACK text-white grid place-items-center shrink-0">
            <ShieldCheck size={20} />
          </div>
          <div className="min-w-0">
            <p className="font-bold text-[15px] truncate">پنل مدیریت</p>
            <p className="text-GRAY text-[12px]">ویترون</p>
          </div>
        </div>
        <nav className="p-2.5 flex flex-col gap-0.5">
          <NavLinks />
        </nav>
      </aside>

      {/* Mobile top bar + horizontal nav */}
      <div className="lg:hidden sticky top-0 z-30 bg-WHITE pt-[env(safe-area-inset-top)] border-b border-WHITE3">
        <div className="flex items-center gap-2 px-4 h-[56px]">
          <div className="h-8 w-8 rounded-lg bg-BLACK text-white grid place-items-center">
            <ShieldCheck size={16} />
          </div>
          <p className="font-bold text-[15px]">پنل مدیریت</p>
        </div>
        <div className="flex gap-2 overflow-x-auto px-4 pb-2 hide-scrollbar">
          {NAV.map((n) => {
            const active = isActive(n);
            const cls = `whitespace-nowrap px-3 py-1.5 rounded-full text-[13px] font-semibold ${
              active ? "bg-BLACK text-white" : "bg-WHITE2 text-BLACK2"
            } ${n.soon ? "opacity-45" : ""}`;
            return n.soon ? (
              <span key={n.to} className={cls}>
                {n.label}
              </span>
            ) : (
              <Link key={n.to} to={n.to} prefetch="intent" className={cls}>
                {n.label}
              </Link>
            );
          })}
        </div>
      </div>

      <div className="min-w-0 px-4 py-4 lg:p-0">
        <Outlet />
      </div>
    </div>
  );
}