stack/apps/web/src/components/layout/topbar.tsx

'use client';

import { useRouter } from 'next/navigation';
import { signOut, useSession } from '@/lib/auth-client';
import { ThemeToggle } from './theme-toggle';
import { useSidebar } from './sidebar-context';

function MenuIcon(): React.JSX.Element {
  return (
    <svg
      width="16"
      height="16"
      viewBox="0 0 16 16"
      fill="none"
      stroke="currentColor"
      strokeWidth="1.5"
    >
      <path d="M2 4h12M2 8h12M2 12h12" />
    </svg>
  );
}

export function Topbar(): React.ReactElement {
  const { data: session } = useSession();
  const router = useRouter();
  const { isMobile, mobileOpen, setMobileOpen, toggleCollapsed } = useSidebar();

  async function handleSignOut(): Promise<void> {
    await signOut();
    router.replace('/login');
  }

  function handleSidebarToggle(): void {
    if (isMobile) {
      setMobileOpen(!mobileOpen);
      return;
    }

    toggleCollapsed();
  }

  return (
    <header
      className="app-header justify-between border-b px-4 md:px-6"
      style={{
        height: 'var(--topbar-h)',
        background: 'color-mix(in srgb, var(--surface) 88%, transparent)',
        borderBottomColor: 'var(--border)',
      }}
    >
      <div className="flex items-center gap-3">
        <button
          type="button"
          onClick={handleSidebarToggle}
          className="btn-ghost rounded-lg border p-2"
          style={{ borderColor: 'var(--border)', color: 'var(--text-2)' }}
          aria-label="Toggle sidebar"
        >
          <MenuIcon />
        </button>
        <div className="hidden sm:block">
          <div className="text-sm font-medium text-[var(--text)]">Workspace</div>
          <div className="text-xs text-[var(--muted)]">Unified agent operations</div>
        </div>
      </div>

      <div className="flex items-center gap-3">
        <ThemeToggle />
        {session?.user ? (
          <>
            <span className="hidden text-sm text-[var(--text-2)] sm:block">
              {session.user.name ?? session.user.email}
            </span>
            <button
              type="button"
              onClick={handleSignOut}
              className="rounded-md px-3 py-1.5 text-sm transition-colors"
              style={{ color: 'var(--muted)' }}
            >
              Sign out
            </button>
          </>
        ) : (
          <span className="text-sm text-[var(--muted)]">Not signed in</span>
        )}
      </div>
    </header>
  );
}