"use client";

import Link from "next/link";
import { usePathname, useRouter } from "next/navigation";
import { useEffect, useState } from "react";
import { useAuth, roleAtLeast } from "@/lib/auth";

const NAV = [
  { href: "/", label: "Dashboard", icon: "▦", min: "readonly" as const },
  { href: "/tasks", label: "Tasks", icon: "✦", min: "readonly" as const },
  { href: "/inventory", label: "Vessels", icon: "▤", min: "readonly" as const },
  { href: "/mcp", label: "MCP Servers", icon: "⚇", min: "readonly" as const },
  { href: "/rules", label: "Rules", icon: "☰", min: "support" as const },
  { href: "/models", label: "Models", icon: "◈", min: "admin" as const },
  { href: "/users", label: "Users", icon: "♟", min: "admin" as const },
];

export default function AppShell({ children }: { children: React.ReactNode }) {
  const { user, loading, logout } = useAuth();
  const router = useRouter();
  const pathname = usePathname();
  const [navOpen, setNavOpen] = useState(false);

  useEffect(() => {
    if (!loading && !user) router.replace("/login");
  }, [loading, user, router]);

  // Close the mobile drawer on navigation.
  useEffect(() => {
    setNavOpen(false);
  }, [pathname]);

  if (loading || !user) {
    return (
      <div className="flex min-h-screen items-center justify-center gap-2 text-muted">
        <span className="inline-block h-4 w-4 animate-spin rounded-full border-2 border-current border-t-transparent" />
        Loading…
      </div>
    );
  }

  const sidebar = (
    <>
      <div className="mb-8 flex items-center gap-2 px-2">
        <div className="grid h-9 w-9 place-items-center rounded-xl bg-gradient-to-br from-accent to-accent2 font-bold text-white">
          A
        </div>
        <div>
          <div className="text-sm font-semibold">Agentic OS</div>
          <div className="text-[11px] text-muted">troubleshooting</div>
        </div>
      </div>
      <nav className="flex flex-1 flex-col gap-1">
        {NAV.filter((n) => roleAtLeast(user.role, n.min)).map((n) => {
          const active = pathname === n.href || (n.href !== "/" && pathname.startsWith(n.href));
          return (
            <Link
              key={n.href}
              href={n.href}
              aria-current={active ? "page" : undefined}
              className={`flex items-center gap-3 rounded-xl px-3 py-2 text-sm transition ${
                active ? "bg-accent/15 text-white" : "text-slate-300 hover:bg-panel2"
              }`}
            >
              <span className="text-base opacity-80" aria-hidden="true">
                {n.icon}
              </span>
              {n.label}
            </Link>
          );
        })}
      </nav>
      <div className="mt-4 border-t border-edge pt-4">
        <div className="px-2 text-sm">{user.full_name || user.email}</div>
        <div className="mb-3 px-2 text-[11px] uppercase tracking-wide text-muted">{user.role}</div>
        <button onClick={logout} className="btn-ghost w-full">
          Sign out
        </button>
      </div>
    </>
  );

  return (
    <div className="flex min-h-screen">
      {/* Mobile top bar */}
      <header className="fixed inset-x-0 top-0 z-30 flex items-center gap-3 border-b border-edge bg-panel/90 px-4 py-3 backdrop-blur md:hidden">
        <button
          aria-label="Open menu"
          aria-expanded={navOpen}
          onClick={() => setNavOpen(true)}
          className="btn-ghost btn-sm"
        >
          ☰
        </button>
        <span className="text-sm font-semibold">Agentic OS</span>
      </header>

      {/* Mobile drawer */}
      {navOpen && (
        <div className="fixed inset-0 z-40 md:hidden" onClick={() => setNavOpen(false)}>
          <div className="absolute inset-0 bg-black/60" />
          <aside
            className="absolute left-0 top-0 flex h-full w-64 flex-col border-r border-edge bg-panel p-4"
            onClick={(e) => e.stopPropagation()}
          >
            {sidebar}
          </aside>
        </div>
      )}

      {/* Desktop sidebar */}
      <aside className="hidden w-60 flex-col border-r border-edge bg-panel/60 p-4 md:flex">
        {sidebar}
      </aside>

      <main className="flex-1 overflow-y-auto p-4 pt-20 md:p-8 md:pt-8">{children}</main>
    </div>
  );
}