import DictOptions from './DictOptions'
import DictData from './DictData'

export default function dictConverter(dict, dictMeta) {
  const label = determineDictField(dict, dictMeta.labelField, ...DictOptions.DEFAULT_LABEL_FIELDS)
  const value = determineDictField(dict, dictMeta.valueField, ...DictOptions.DEFAULT_VALUE_FIELDS)
  const children = determineDictField(dict, dictMeta.childrenField, ...DictOptions.DEFAULT_CHILDREN_FIELDS)

  // 递归处理子字典
  const childDicts = dict[children]
  let childDictData = []
  if (childDicts && childDicts.length > 0) {
    childDictData = childDicts.map(childDict => dictConverter(childDict, dictMeta))
  }

  return new DictData(dict[label], dict[value], dict, childDictData)
  // return new DictData(dict[label], dict[value], dict, dict[children])
}

/**
 * 确定字典字段
 * @param {DictData} dict
 * @param  {...String} fields
 */
function determineDictField(dict, ...fields) {
  return fields.find(f => Object.prototype.hasOwnProperty.call(dict, f))
}