"use client";

import type { ReactNode } from "react";
import { useState } from "react";
import Link from "next/link";
import { usePathname } from "next/navigation";
import { AnimatePresence, motion } from "motion/react";
import { Logomark } from "@/components/logomark";
import { useI18n } from "@/i18n/i18n-provider";
import type { Dictionary } from "@/i18n/dictionary-type";

function getAdminNav(t: Dictionary) {
  return [
    { href: "/admin", label: t.adminShell.navDashboard },
    { href: "/admin/bestellungen", label: t.adminShell.navOrders },
    { href: "/admin/retouren", label: t.adminShell.navReturns },
    { href: "/admin/produkte", label: t.adminShell.navProducts },
    { href: "/admin/ernten", label: t.adminShell.navHarvests },
    { href: "/admin/chargen", label: t.adminShell.navBatches },
    { href: "/admin/anfragen", label: t.adminShell.navBusinessInquiries },
    { href: "/admin/benutzer", label: t.adminShell.navUsers },
    { href: "/admin/versand", label: t.adminShell.navShipping },
    { href: "/admin/gutscheine", label: t.adminShell.navVouchers },
    { href: "/admin/bewertungen", label: t.adminShell.navReviews },
    { href: "/admin/inhalte", label: t.adminShell.navContent },
    { href: "/admin/audit-log", label: t.adminShell.navAuditLog },
  ];
}

function isActiveHref(pathname: string, href: string): boolean {
  if (href === "/admin") return pathname === "/admin";
  return pathname === href || pathname.startsWith(`${href}/`);
}

function NavLinks({
  pathname,
  adminNav,
  onNavigate,
}: {
  pathname: string;
  adminNav: ReturnType<typeof getAdminNav>;
  onNavigate?: () => void;
}) {
  return (
    <>
      {adminNav.map((item) => {
        const active = isActiveHref(pathname, item.href);
        return (
          <Link
            key={item.href}
            href={item.href}
            onClick={onNavigate}
            aria-current={active ? "page" : undefined}
            className={`block px-5 py-2.5 text-sm border-l-2 transition-colors ${
              active
                ? "border-honey bg-cream/10 text-cream"
                : "border-transparent text-cream/70 hover:text-cream hover:bg-cream/5"
            }`}
          >
            {item.label}
          </Link>
        );
      })}
    </>
  );
}

function Wordmark() {
  return (
    <span className="flex items-center gap-2">
      <Logomark className="h-7 w-7 flex-shrink-0" variant="inverted" />
      <span className="tracking-[0.15em] text-xs whitespace-nowrap">WABENHAIN ADMIN</span>
    </span>
  );
}

interface AdminShellProps {
  adminName: string;
  logoutAction: () => void | Promise<void>;
  children: ReactNode;
}

/**
 * Sidebar-Layout fuer den Admin-Bereich statt der frueheren einzeiligen,
 * horizontal scrollenden Navigation (11 Punkte passten auf typischen
 * Bildschirmbreiten nicht nebeneinander). Ab lg persistente Sidebar links,
 * darunter ein Vollbild-Overlay-Menue nach demselben Muster wie die mobile
 * Hauptnavigation in site-chrome.tsx.
 */
export function AdminShell({ adminName, logoutAction, children }: AdminShellProps) {
  const { t } = useI18n();
  const adminNav = getAdminNav(t);
  const pathname = usePathname();
  const [mobileOpen, setMobileOpen] = useState(false);

  return (
    <div className="min-h-screen bg-cream/40 lg:flex">
      <aside className="hidden lg:flex lg:flex-col lg:w-60 lg:shrink-0 lg:sticky lg:top-0 lg:h-screen bg-forest text-cream">
        <div className="flex items-center h-16 px-5 border-b border-cream/10">
          <Wordmark />
        </div>
        <nav aria-label={t.adminShell.navAriaLabel} className="flex-1 overflow-y-auto py-4 flex flex-col gap-0.5">
          <NavLinks pathname={pathname} adminNav={adminNav} />
        </nav>
        <div className="px-5 py-4 border-t border-cream/10">
          <p className="text-xs text-cream/60 truncate">{t.adminShell.loggedInAs(adminName)}</p>
          <form action={logoutAction} className="mt-2">
            <button type="submit" className="text-xs text-cream/80 underline hover:text-cream">
              {t.adminShell.logout}
            </button>
          </form>
        </div>
      </aside>

      <div className="flex-1 min-w-0">
        <header className="lg:hidden sticky top-0 z-30 bg-forest text-cream flex items-center justify-between h-16 px-5">
          <Wordmark />
          <button
            aria-label={t.adminShell.openMenu}
            className="w-10 h-10 flex items-center justify-center flex-shrink-0"
            onClick={() => setMobileOpen(true)}
          >
            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
              <path d="M3 6h18M3 12h18M3 18h18" />
            </svg>
          </button>
        </header>

        <main className="max-w-6xl mx-auto px-6 py-10 overflow-x-hidden">
          {children}
        </main>
      </div>

      <AnimatePresence>
        {mobileOpen ? (
          <motion.div
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            exit={{ opacity: 0 }}
            transition={{ duration: 0.2 }}
            className="lg:hidden fixed inset-0 z-50 bg-forest text-cream flex flex-col"
          >
            <div className="flex items-center justify-between h-16 px-5 border-b border-cream/10 flex-shrink-0">
              <Wordmark />
              <button
                aria-label={t.adminShell.closeMenu}
                className="w-10 h-10 flex items-center justify-center flex-shrink-0"
                onClick={() => setMobileOpen(false)}
              >
                <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5">
                  <path d="M6 6l12 12M18 6L6 18" />
                </svg>
              </button>
            </div>
            <nav aria-label={t.adminShell.mobileNavAriaLabel} className="flex-1 overflow-y-auto py-4">
              <NavLinks pathname={pathname} adminNav={adminNav} onNavigate={() => setMobileOpen(false)} />
            </nav>
            <div className="px-5 py-4 border-t border-cream/10 flex-shrink-0">
              <p className="text-xs text-cream/60">{t.adminShell.loggedInAs(adminName)}</p>
              <form action={logoutAction} className="mt-2">
                <button type="submit" className="text-xs text-cream/80 underline hover:text-cream">
                  {t.adminShell.logout}
                </button>
              </form>
            </div>
          </motion.div>
        ) : null}
      </AnimatePresence>
    </div>
  );
}