"use client";

import Link from "next/link";
import { usePathname } from "next/navigation";
import { BarChart3, CalendarDays, CheckCircle2, CreditCard, LayoutDashboard, Mail, QrCode, Settings, Users, Workflow, MessageCircle, Handshake, Contact, Plug } from "lucide-react";
import { clsx } from "clsx";
import { useEffect, useState } from "react";
import { apiFetch, clearAccessToken } from "@/lib/api";
import Image from "next/image";

const nav = [
  ["Dashboard", "/dashboard", LayoutDashboard, "dashboard"],
  ["Events", "/events", CalendarDays, "events"],
  ["Attendees", "/attendees", Users, "attendees"],
  ["Invitees", "/invitees", Mail, "invitees"],
  ["RSVPs", "/rsvps", CheckCircle2, "rsvps"],
  ["Registrations", "/registrations", Users, "registrations"],
  ["Check-in (Live)", "/check-in", QrCode, "checkins"],
  ["QR Codes", "/qr-codes", QrCode, "qrcodes"],
  ["Forms & Workflows", "/forms-workflows", Workflow, "workflows"],
  ["Calendar", "/calendar", CalendarDays, "calendar"],
  ["Communications", "/communications", MessageCircle, "communications"],
  ["Email Campaigns", "/email-campaigns", Mail, "communications"],
  ["WhatsApp Campaigns", "/whatsapp-campaigns", MessageCircle, "communications"],
  ["Payments", "/payments", CreditCard, "payments"],
  ["CRM Pipeline", "/crm-pipeline", Handshake, "crm"],
  ["Contacts / Leads", "/contacts-leads", Contact, "crm"],
  ["Reports", "/reports", BarChart3, "reports"],
  ["Settings", "/settings", Settings, "settings"],
  ["Integrations", "/integrations", Plug, "integrations"]
] as const;

export function AdminShell({ title, children }: { title: string; children: React.ReactNode }) {
  const pathname = usePathname();
  const [appName, setAppName] = useState<string>("EventSphere");
  const [logoUrl, setLogoUrl] = useState<string | null>(null);
  const [modules, setModules] = useState<Record<string, boolean> | null>(null);
  const [me, setMe] = useState<{ fullName: string; email: string; avatarUrl?: string | null; mustChangePassword?: boolean } | null>(null);

  useEffect(() => {
    const load = async () => {
      try {
        const settings = await apiFetch<{ appName: string | null; logoUrl: string | null; modules: Record<string, boolean> | null }>("/settings");
        setAppName(settings.appName ?? "EventSphere");
        setLogoUrl(settings.logoUrl ?? null);
        setModules(settings.modules ?? null);
      } catch {
        setAppName("EventSphere");
        setLogoUrl(null);
        setModules(null);
      }
    };
    void load();
  }, []);

  useEffect(() => {
    const load = async () => {
      try {
        const payload = await apiFetch<{ user: any }>("/auth/me");
        const u = payload.user ?? null;
        if (!u) return;
        setMe({ fullName: String(u.fullName ?? "User"), email: String(u.email ?? ""), avatarUrl: u.avatarUrl ?? null, mustChangePassword: Boolean(u.mustChangePassword) });
      } catch {
        setMe(null);
      }
    };
    void load();
  }, []);

  useEffect(() => {
    if (me?.mustChangePassword && typeof window !== "undefined" && window.location.pathname !== "/change-password") {
      window.location.href = "/change-password";
    }
  }, [me]);

  useEffect(() => {
    if (!modules) return;
    const entry = nav.find((n) => n[1] === pathname);
    if (!entry) return;
    const key = entry[3];
    if (key && modules[key] === false) {
      window.location.href = "/dashboard";
    }
  }, [modules, pathname]);

  return <div className="min-h-screen bg-surface">
    <aside className="fixed inset-y-0 left-0 w-72 bg-[#06264A] p-5 text-white">
      <div className="mb-8 flex items-center gap-3">
        {logoUrl ? (
          <Image src={logoUrl} alt={appName} width={44} height={44} className="h-11 w-11 rounded-xl object-cover" />
        ) : (
          <div className="grid h-11 w-11 place-items-center rounded-xl bg-accent font-black">E</div>
        )}
        <div><div className="text-xl font-black">{appName}</div><div className="text-xs text-blue-100">Enterprise Event Management Platform</div></div>
      </div>
      <nav className="space-y-1">
        {nav
          .filter(([, , , key]) => (modules ? modules[key] !== false : true))
          .map(([label, href, Icon]) => (
            <Link
              key={href}
              href={href}
              className={clsx(
                "flex items-center gap-3 rounded-xl px-4 py-3 text-sm font-semibold",
                pathname === href ? "bg-accent text-white" : "text-blue-50 hover:bg-white/10"
              )}
            >
              <Icon size={18} /> {label}
            </Link>
          ))}
      </nav>
      <div className="absolute bottom-5 left-5 right-5 rounded-2xl border border-white/15 bg-white/5 p-4">
        <div className="text-sm font-bold">EventSphere Team</div>
        <div className="text-xs text-blue-100">Enterprise Plan</div>
        <button className="mt-3 w-full rounded-xl bg-accent py-2 text-sm font-bold">View Plan</button>
      </div>
    </aside>
    <main className="ml-72">
      <header className="sticky top-0 z-10 flex h-20 items-center justify-between border-b border-line bg-white/90 px-8 backdrop-blur">
        <div className="text-lg font-bold">{title}</div>
        <div className="flex items-center gap-4">
          <input className="w-72 rounded-xl border border-line px-4 py-2 text-sm" placeholder="Search anything..." />
          <Link href="/profile" className="flex items-center gap-3 rounded-xl px-3 py-2 hover:bg-slate-100">
            {me?.avatarUrl ? (
              <Image src={me.avatarUrl} alt={me.fullName} width={34} height={34} className="h-9 w-9 rounded-xl object-cover" />
            ) : (
              <div className="grid h-9 w-9 place-items-center rounded-xl bg-slate-200 text-xs font-black text-slate-700">SA</div>
            )}
            <div className="text-sm">
              <b>{me?.fullName ?? "Super Admin"}</b>
              <div className="text-xs text-slate-500">{me?.email ?? "Administrator"}</div>
            </div>
          </Link>
          <button
            className="rounded-xl border border-line px-3 py-2 text-sm font-semibold"
            onClick={async () => {
              try {
                await apiFetch("/auth/logout", { method: "POST", body: JSON.stringify({}) });
              } finally {
                clearAccessToken();
                window.location.href = "/login";
              }
            }}
          >
            Logout
          </button>
        </div>
      </header>
      <section className="p-8">{children}</section>
    </main>
  </div>;
}