import { codeToText, regionData } from 'element-china-area-data'

const buildMap = (nodes, map) => {
  nodes.forEach((node) => {
    if (node?.value && node?.label) {
      map[node.value] = node.label
    }
    if (node?.children?.length) {
      buildMap(node.children, map)
    }
  })
}

const fallbackMap = {}
if (!codeToText && Array.isArray(regionData)) {
  buildMap(regionData, fallbackMap)
}

export const regionLabel = (code) => {
  if (!code) return ''
  const mapping = codeToText || fallbackMap
  return mapping?.[code] || code
}

export const formatRegion = (province, city, district) => {
  const parts = [province, city, district].filter(Boolean).map(regionLabel)
  return parts.join(' ')
}