export interface BreadcrumbCrumb {
  label: string
  href: string
}

const routeTitles: Record<string, string> = {
  '/': 'Панель управления',
  '/domains': 'Домены',
  '/groups': 'Группы доменов',
  '/services': 'Сервисы',
  '/certificates': 'Сертификаты',
}

const SETTINGS_SECTIONS: Record<string, string> = {
  '/settings/appearance': 'Внешний вид',
  '/settings/health': 'Health-check',
  '/settings/integrations': 'Интеграции',
}

/** Drop consecutive repeats so «Настройки» does not stack after tab switches. */
export function dedupeBreadcrumbs(crumbs: BreadcrumbCrumb[]): BreadcrumbCrumb[] {
  const out: BreadcrumbCrumb[] = []
  for (const crumb of crumbs) {
    const prev = out.at(-1)
    if (prev && prev.label === crumb.label) continue
    out.push(crumb)
  }
  return out
}

export function getBreadcrumbs(
  pathname: string,
  dynamicLabels: Record<string, string> = {},
): BreadcrumbCrumb[] {
  const path = pathname.replace(/\/+$/, '') || '/'

  if (path === '/') {
    return [{ label: 'Панель управления', href: '/' }]
  }

  if (path.match(/^\/services\/\d+$/)) {
    return [
      { label: 'Сервисы', href: '/services' },
      { label: dynamicLabels[path] ?? 'Сервис', href: path },
    ]
  }

  if (path.match(/^\/groups\/\d+$/)) {
    return [
      { label: 'Группы доменов', href: '/groups' },
      { label: dynamicLabels[path] ?? 'Группа', href: path },
    ]
  }

  if (path.match(/^\/domains\/\d+\/dns$/)) {
    const domainId = path.split('/')[2]
    const domainPath = `/domains/${domainId}`
    return [
      { label: 'Домены', href: '/domains' },
      { label: dynamicLabels[domainPath] ?? 'Домен', href: domainPath },
      { label: 'DNS', href: path },
    ]
  }

  if (path.match(/^\/domains\/\d+$/)) {
    return [
      { label: 'Домены', href: '/domains' },
      { label: dynamicLabels[path] ?? 'Обзор домена', href: path },
    ]
  }

  if (path === '/settings' || path.startsWith('/settings/')) {
    const section = SETTINGS_SECTIONS[path]
    return dedupeBreadcrumbs([
      { label: 'Настройки', href: '/settings' },
      ...(section ? [{ label: section, href: path }] : []),
    ])
  }

  const title = routeTitles[path]
  if (title) {
    return [{ label: title, href: path }]
  }

  return [{ label: 'Панель управления', href: '/' }]
}