ai_synth/frontend/src/components/Navbar.tsx

import { type Component, Show } from 'solid-js';
import { A, useLocation } from '@solidjs/router';
import { BrainCircuit, Settings, LogOut, Menu, Shield } from 'lucide-solid';
import { useAuth } from '~/contexts/AuthContext';
import { useI18n } from '~/i18n';

interface NavbarProps {
  onToggleMobile: () => void;
}

/**
 * Top navigation bar visible on all authenticated pages.
 *
 * - **Active route detection**: The current pathname is compared against each
 *   link's `href` to apply a highlighted bottom-border style.
 * - **Admin link visibility**: The admin navigation link is only rendered
 *   when `isAdmin()` is true, using a prefix match on `/admin` for the
 *   active state so all admin sub-routes highlight the same tab.
 */
const Navbar: Component<NavbarProps> = (props) => {
  const { user, isAdmin, logout } = useAuth();
  const location = useLocation();
  const { t } = useI18n();

  const isActive = (path: string) =>
    location.pathname === path
      ? 'border-indigo-500 text-gray-900'
      : 'border-transparent text-gray-500 hover:border-gray-300 hover:text-gray-700';

  return (
    <nav class="bg-white shadow-sm border-b border-gray-200">
      <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
        <div class="flex justify-between h-16">
          <div class="flex">
            <div class="flex-shrink-0 flex items-center">
              <BrainCircuit class="h-8 w-8 text-indigo-600" />
              <A href="/" class="ml-2 text-xl font-bold text-gray-900">
                AI Weekly Synth
              </A>
            </div>
            <div class="hidden sm:ml-6 sm:flex sm:space-x-8">
              <A
                href="/"
                class={`inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium ${isActive('/')}`}
              >
                {t('nav.syntheses')}
              </A>
              <A
                href="/themes"
                class={`inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium ${isActive('/themes')}`}
              >
                {t('nav.themes')}
              </A>
              <Show when={isAdmin()}>
                <A
                  href="/admin/providers"
                  class={`inline-flex items-center px-1 pt-1 border-b-2 text-sm font-medium ${
                    location.pathname.startsWith('/admin')
                      ? 'border-indigo-500 text-gray-900'
                      : 'border-transparent text-gray-500 hover:border-gray-300 hover:text-gray-700'
                  }`}
                >
                  <Shield class="h-4 w-4 mr-1" />
                  {t('nav.admin')}
                </A>
              </Show>
            </div>
          </div>

          <div class="flex items-center">
            {/* Mobile hamburger button */}
            <button
              type="button"
              onClick={() => props.onToggleMobile()}
              class="sm:hidden inline-flex items-center justify-center p-2 rounded-md text-gray-400 hover:text-gray-500 hover:bg-gray-100 focus:outline-none focus:ring-2 focus:ring-inset focus:ring-indigo-500"
              aria-label={t('nav.menuOpen')}
            >
              <Menu class="h-6 w-6" />
            </button>

            {/* Desktop user section */}
            <Show when={user()}>
              {(currentUser) => (
                <div class="hidden sm:flex items-center space-x-4">
                  <span class="text-sm text-gray-700">
                    {currentUser().email}
                  </span>
                  <A
                    href="/settings"
                    class="text-gray-400 hover:text-gray-600 p-2 rounded-full hover:bg-gray-100 transition-colors"
                    title={t('nav.settings')}
                  >
                    <Settings class="h-5 w-5" />
                  </A>
                  <button
                    onClick={() => logout()}
                    class="inline-flex items-center px-3 py-1.5 border border-gray-300 shadow-sm text-sm font-medium rounded-md text-gray-700 bg-white hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500"
                  >
                    <LogOut class="h-4 w-4 mr-2" />
                    {t('nav.logout')}
                  </button>
                </div>
              )}
            </Show>
          </div>
        </div>
      </div>
    </nav>
  );
};

export default Navbar;