/** Transliterated slugs from migration 15 → conventional English slugs (migration 81). */
export const LEGACY_CITY_SLUG_REDIRECTS: Record<string, string> = {
  thran: 'tehran',
  mshd: 'mashhad',
  asfhan: 'isfahan',
  syraz: 'shiraz',
  tbryz: 'tabriz',
}

export function resolveCanonicalCitySlug(slug: string): string {
  return LEGACY_CITY_SLUG_REDIRECTS[slug] ?? slug
}

export function isLegacyCitySlug(slug: string): boolean {
  return Object.hasOwn(LEGACY_CITY_SLUG_REDIRECTS, slug)
}