cloudflare-domain-manager/apps/web/src/components/layout/site-header.tsx

import { Fragment, useMemo } from 'react'
import { Link, useMatches, useRouterState } from '@tanstack/react-router'
import {
  Breadcrumb,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbList,
  BreadcrumbPage,
  BreadcrumbSeparator,
} from '@cfdm/ui/components/breadcrumb'
import { Separator } from '@cfdm/ui/components/separator'
import { SystemMonitorPopover } from '@/components/layout/system-monitor-popover'
import { AppsMenu } from '@/components/layout/apps-menu'
import { SidebarTrigger } from '@cfdm/ui/components/sidebar'
import { getBreadcrumbs } from '@/lib/breadcrumbs'

export interface RouteBreadcrumbLoaderData {
  breadcrumb?: string
}

function useDynamicBreadcrumbLabels() {
  const matches = useMatches()
  return useMemo(() => {
    const labels: Record<string, string> = {}
    for (const match of matches) {
      const data = match.loaderData as RouteBreadcrumbLoaderData | undefined
      if (data?.breadcrumb && match.pathname) {
        labels[match.pathname] = data.breadcrumb
      }
    }
    return labels
  }, [matches])
}

/** Header chrome — AppsMenu + SystemMonitor; theme in NavUser (app-shell-1). */
export function SiteHeader() {
  const pathname = useRouterState({ select: (s) => s.location.pathname })
  const dynamicLabels = useDynamicBreadcrumbLabels()
  const crumbs = useMemo(
    () => getBreadcrumbs(pathname, dynamicLabels),
    [pathname, dynamicLabels],
  )

  return (
    <header className="bg-background sticky top-0 z-10 flex h-12 shrink-0 items-center gap-2 border-b px-4 md:px-6">
      <SidebarTrigger className="-ml-1" />
      <Separator orientation="vertical" className="mr-2 data-[orientation=vertical]:h-4" />
      <Breadcrumb>
        <BreadcrumbList>
          {crumbs.map((crumb, index) => {
            const isLast = index === crumbs.length - 1
            return (
              <Fragment key={`${index}-${crumb.href}`}>
                {index > 0 ? (
                  <BreadcrumbSeparator className="hidden md:block" />
                ) : null}
                <BreadcrumbItem
                  className={index === 0 && !isLast ? 'hidden md:block' : undefined}
                >
                  {isLast ? (
                    <BreadcrumbPage>{crumb.label}</BreadcrumbPage>
                  ) : (
                    <BreadcrumbLink render={<Link to={crumb.href} />}>
                      {crumb.label}
                    </BreadcrumbLink>
                  )}
                </BreadcrumbItem>
              </Fragment>
            )
          })}
        </BreadcrumbList>
      </Breadcrumb>
      <div className="ml-auto flex items-center gap-2">
        <AppsMenu />
        <SystemMonitorPopover />
      </div>
    </header>
  )
}