const postfix = '_expiry' // 缓存有效期后缀   

module.exports = {
  /**  
   * 设置缓存   
   * @param  {[type]} k [键名]  
   * @param  {[type]} v [键值]  
   * @param  {[type]} t [时间、单位秒]  
   */
  set(k, v, t) {
    uni.setStorageSync(k, v)
    const seconds = parseInt(t)
    if (seconds > 0) {
      let timestamp = Date.parse(new Date())
      timestamp = timestamp / 1000 + seconds
      uni.setStorageSync(k + postfix, timestamp + '')
    } else {
      uni.removeStorageSync(k + postfix)
    }
  },

  /**  
   * 获取缓存   
   * @param  {[type]} k   [键名]  
   * @param  {[type]} def [获取为空时默认]  
   */
  get(k, def) {
    const deadtime = parseInt(uni.getStorageSync(k + postfix))
    if (deadtime) {
      if (parseInt(deadtime) < Date.parse(new Date()) / 1000) {
        if (def) {
          return def
        } else {
          return false
        }
      }
    }
    const res = uni.getStorageSync(k)
    if (res) {
      return res
    }
    if (def == undefined || def == "") {
      def = false
    }
    return def
  },

  /**
   * 删除指定缓存
   * @param {Object} k
   */
  remove(k) {
    uni.removeStorageSync(k)
    uni.removeStorageSync(k + postfix)
  },

  /**  
   * 清理所有缓存  
   * @return {[type]} [description]  
   */
  clear() {
    uni.clearStorageSync()
  }
}

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