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import { isString, isArray } from '../helpers/types'import * as ErrorMsg from '../core/errorMessages'
const hasOwn = Object.prototype.hasOwnProperty
export default class KeyStore {  constructor(keys) {    this._keys = []    this._keyMap = {}
    let totalWeight = 0
    keys.forEach((key) => {      let obj = createKey(key)
      totalWeight += obj.weight
      this._keys.push(obj)      this._keyMap[obj.id] = obj
      totalWeight += obj.weight    })
    // Normalize weights so that their sum is equal to 1    this._keys.forEach((key) => {      key.weight /= totalWeight    })  }  get(keyId) {    return this._keyMap[keyId]  }  keys() {    return this._keys  }  toJSON() {    return JSON.stringify(this._keys)  }}
export function createKey(key) {  let path = null  let id = null  let src = null  let weight = 1
  if (isString(key) || isArray(key)) {    src = key    path = createKeyPath(key)    id = createKeyId(key)  } else {    if (!hasOwn.call(key, 'name')) {      throw new Error(ErrorMsg.MISSING_KEY_PROPERTY('name'))    }
    const name = key.name    src = name
    if (hasOwn.call(key, 'weight')) {      weight = key.weight
      if (weight <= 0) {        throw new Error(ErrorMsg.INVALID_KEY_WEIGHT_VALUE(name))      }    }
    path = createKeyPath(name)    id = createKeyId(name)  }
  return { path, id, weight, src }}
export function createKeyPath(key) {  return isArray(key) ? key : key.split('.')}
export function createKeyId(key) {  return isArray(key) ? key.join('.') : key}