/* 基础小工具，可通用于服务端和用户端
 */

module.exports = {
  sleep: (ms) => new Promise((resolve, reject) => setTimeout(resolve, ms)),
  parseJsonPossible(value) {
    try {
      return JSON.parse(value)
    } catch (e) {
      return value
    }
  },
  sortAndFilterJson({ fields, entity, exclude = [] } = {}) {
    const newEntity = {}
    for (let key of Object.keys(fields).sort()) {
      if (typeof (entity[key] !== 'undefined') && !Number.isNaN(entity[key]) && entity[key] !== Infinity) {
        newEntity[key] = entity[key]
      }
    }
    for (let exkey of exclude) {
      delete newEntity[exkey]
    }
    return JSON.stringify(newEntity)
  },
}