// departamento → ciudad → barrios[]
export type GeoData = Record<string, Record<string, string[]>>

let geoData: GeoData | null = null
let geoPromise: Promise<GeoData> | null = null

export async function getGeoData(): Promise<GeoData> {
  if (geoData) return geoData
  if (!geoPromise) {
    geoPromise = fetch('/data/geo_paraguay_full.json')
      .then((r) => r.json())
      .then((data: GeoData) => { geoData = data; return data })
      .catch((err) => { geoPromise = null; throw err })
  }
  return geoPromise
}