"use client";

import { useEffect, useState } from "react";
import Link from "next/link";
import { usePathname, useRouter } from "next/navigation";
import {
  Flag,
  FolderClosed,
  LayoutGrid,
  LogOut,
  MessageSquare,
  Users,
} from "lucide-react";
import { api, type Me } from "@/lib/api";
import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";
import { ConfirmProvider } from "@/components/confirm";

const NAV = [
  { href: "/users", label: "Users", icon: Users },
  { href: "/posts", label: "Posts", icon: LayoutGrid },
  { href: "/collections", label: "Collections", icon: FolderClosed },
  { href: "/feedback", label: "Feedback", icon: MessageSquare },
  { href: "/reports", label: "Reports", icon: Flag },
];

export default function DashboardLayout({
  children,
}: {
  children: React.ReactNode;
}) {
  const router = useRouter();
  const pathname = usePathname();
  const [me, setMe] = useState<Me | null>(null);
  const [checked, setChecked] = useState(false);

  // Admin gate: only an authenticated admin may see the dashboard. Anyone
  // else is bounced to /login. The BFF independently enforces this on every
  // /admin/* call, so this is UX, not the security boundary.
  useEffect(() => {
    let cancelled = false;
    api
      .me()
      .then((u) => {
        if (cancelled) return;
        if (!u || u.role !== "admin") {
          router.replace("/login");
          return;
        }
        setMe(u);
        setChecked(true);
      })
      .catch(() => {
        if (!cancelled) router.replace("/login");
      });
    return () => {
      cancelled = true;
    };
  }, [router]);

  async function signOut() {
    await api.logout().catch(() => {});
    router.replace("/login");
  }

  if (!checked || !me) {
    return (
      <div className="flex min-h-screen items-center justify-center text-sm text-muted-foreground">
        Loading…
      </div>
    );
  }

  return (
    <div className="flex min-h-screen">
      <aside className="flex w-60 shrink-0 flex-col border-r border-border bg-card">
        <div className="px-5 py-5">
          <p className="text-xs uppercase tracking-[0.2em] text-primary">
            Prabhupāda Says
          </p>
          <p className="mt-0.5 text-sm font-semibold text-foreground">Admin</p>
        </div>
        <nav className="flex-1 space-y-1 px-3">
          {NAV.map(({ href, label, icon: Icon }) => {
            const active = pathname === href || pathname.startsWith(href + "/");
            return (
              <Link
                key={href}
                href={href}
                className={cn(
                  "flex items-center gap-3 rounded-lg px-3 py-2 text-sm transition-colors",
                  active
                    ? "bg-accent text-accent-foreground font-medium"
                    : "text-muted-foreground hover:bg-muted hover:text-foreground",
                )}
              >
                <Icon className="size-4" />
                {label}
              </Link>
            );
          })}
        </nav>
        <div className="border-t border-border px-3 py-3">
          <div className="px-3 pb-2 text-xs text-muted-foreground">
            <p className="truncate font-medium text-foreground">{me.name}</p>
            <p className="truncate">@{me.handle}</p>
          </div>
          <Button
            variant="ghost"
            size="sm"
            onClick={signOut}
            className="w-full justify-start text-muted-foreground"
          >
            <LogOut className="size-4" />
            Sign out
          </Button>
        </div>
      </aside>

      <main className="flex-1 overflow-x-hidden px-6 py-6 lg:px-10">
        <div className="mx-auto max-w-6xl">
          <ConfirmProvider>{children}</ConfirmProvider>
        </div>
      </main>
    </div>
  );
}