'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { useTranslations } from 'next-intl';

/**
 * Settings sub-sidebar (D-19, D-20).
 * Phase 05 categories: Dashboard > Widgets, Calendar.
 * Active item uses sidebar-accent pattern with aria-current="page".
 */
export function SettingsSidebar() {
  const t = useTranslations('settings');
  const pathname = usePathname();

  const items = [
    {
      label: t('categoryWidgets'),
      href: '/settings/dashboard',
    },
    {
      label: t('categoryCalendar'),
      href: '/settings/dashboard/calendar',
    },
  ];

  const isActive = (href: string) => {
    if (href === '/settings/dashboard') {
      // Active when exactly on /settings/dashboard (not on sub-routes like /calendar)
      return pathname === '/settings/dashboard';
    }
    return pathname.startsWith(href);
  };

  return (
    // a11y/useSemanticElements: role="navigation" nicht auf das <aside> gehoben --
    // darunter stehen zwei <nav>-Bereiche (Allgemein, Dashboard); ein drittes
    // Navigations-Landmark auf dem Rahmen waere doppelt. Jedes <nav> traegt
    // stattdessen die Beschriftung seiner eigenen Kategorie.
    <aside className="flex w-full shrink-0 flex-col border-b border-border py-2 md:w-[220px] md:border-b-0">
      {/* Allgemein category — above Dashboard (Surface C, 07-06) */}
      <div className="px-5 pb-1 pt-3">
        <h2 className="text-xs font-semibold text-muted-foreground">
          {t('categoryGeneral')}
        </h2>
      </div>
      <nav className="mb-2 flex flex-col gap-0.5 px-3" aria-label={t('categoryGeneral')}>
        <Link
          href="/settings/general/account"
          className={`nav-item flex h-9 items-center rounded-lg px-2.5 text-sm transition-colors ${
            isActive('/settings/general/account')
              ? 'bg-sidebar-accent text-sidebar-accent-foreground font-semibold'
              : 'text-sidebar-foreground hover:bg-sidebar-hover'
          }`}
          aria-current={
            isActive('/settings/general/account') ? 'page' : undefined
          }
        >
          {t('categoryAccount')}
        </Link>
        <Link
          href="/settings/general/desktop"
          className={`nav-item flex h-9 items-center rounded-lg px-2.5 text-sm transition-colors ${
            isActive('/settings/general/desktop')
              ? 'bg-sidebar-accent text-sidebar-accent-foreground font-semibold'
              : 'text-sidebar-foreground hover:bg-sidebar-hover'
          }`}
          aria-current={
            isActive('/settings/general/desktop') ? 'page' : undefined
          }
        >
          {t('categoryDesktopApp')}
        </Link>
        <Link
          href="/settings/custom-modules"
          className={`nav-item flex h-9 items-center rounded-lg px-2.5 text-sm transition-colors ${
            isActive('/settings/custom-modules')
              ? 'bg-sidebar-accent text-sidebar-accent-foreground font-semibold'
              : 'text-sidebar-foreground hover:bg-sidebar-hover'
          }`}
          aria-current={
            isActive('/settings/custom-modules') ? 'page' : undefined
          }
        >
          {t('categoryCustomModules')}
        </Link>
      </nav>

      {/* Dashboard category — existing items unchanged */}
      <div className="px-5 pb-1 pt-4">
        <h2 className="text-xs font-semibold text-muted-foreground">
          {t('categoryDashboard')}
        </h2>
      </div>
      <nav className="flex flex-col gap-0.5 px-3" aria-label={t('categoryDashboard')}>
        {items.map((item) => (
          <Link
            key={item.href}
            href={item.href}
            className={`nav-item flex h-9 items-center rounded-lg px-2.5 text-sm transition-colors ${
              isActive(item.href)
                ? 'bg-sidebar-accent text-sidebar-accent-foreground font-semibold'
                : 'text-sidebar-foreground hover:bg-sidebar-hover'
            }`}
            aria-current={isActive(item.href) ? 'page' : undefined}
          >
            {item.label}
          </Link>
        ))}
      </nav>
    </aside>
  );
}