import { EXPIRE } from '@/config/app';

class Cache {

  constructor(handler) {
    this.cacheSetHandler = uni.setStorageSync;
    this.cacheGetHandler = uni.getStorageSync;
    this.cacheClearHandler = uni.removeStorageSync;
    this.cacheExpire = '_expire_2019_12_17_18_44';
  }

  /**
   * 获取当前时间戳
   */
  time() {
    return Math.round(new Date() / 1000);
  }

  /**
   * 设置过期时间缓存
   * @param {Object} key
   * @param {Object} expire
   */
  setExpireCahe(key, expire) {
    expire = expire !== undefined ? expire : EXPIRE;
    if (expire) {
      this.cacheSetHandler(key + this.cacheExpire, this.time() + expire)
    }
  }

  /**
   * 缓存是否过期,过期自动删除
   * @param {Object} key
   * @param {Object} $bool true = 删除,false = 不删除
   */
  getExpireCahe(key, $bool) {
    try {
      let time = this.cacheGetHandler(key + this.cacheExpire);
      if (time) {
        let newTime = parseInt(time);
        if (time && time < this.time() && !Number.isNaN(newTime)) {
          if ($bool === undefined || $bool === true) {
            this.cacheClearHandler(key);
            this.cacheClearHandler(key + this.cacheExpire);
          }
          return false;
        } else
          return true;
      } else {
        return !!this.cacheGetHandler(key);
      }
    } catch (e) {
      return false;
    }
  }

  /**
   * 设置缓存
   * @param {Object} key
   * @param {Object} data
   */
  set(key, data, expire) {
    if (typeof data === 'object')
      data = JSON.stringify(data);
    try {
      this.setExpireCahe(key, expire);
      return this.cacheSetHandler(key, data);
    } catch (e) {
      return false;
    }
  }

  /**
   * 检测缓存是否存在
   * @param {Object} key
   */
  has(key) {
    return this.getExpireCahe(key);
  }

  /**
   * 获取缓存
   * @param {Object} key
   * @param {Object} $default
   * @param {Object} expire
   */
  get(key, $default, expire) {
    try {
      let isBe = this.getExpireCahe(key);
      let data = this.cacheGetHandler(key);
      if (data && isBe) {
        if (typeof $default === 'boolean')
          return JSON.parse(data);
        else
          return data;
      } else {
        if (typeof $default === 'function') {
          let value = $default();
          this.set(key, value, expire);
          return value;
        } else {
          this.set(key, $default, expire);
          return $default;
        }
      }
    } catch (e) {
      return null;
    }
  }

  /**
   * 删除缓存
   * @param {Object} key
   */
  clear(key) {
    try {
      let cahceValue = this.cacheGetHandler(key + this.cacheExpire);
      if (cahceValue)
        this.cacheClearHandler(key + this.cacheExpire);
      return this.cacheClearHandler(key);
    } catch (e) {
      return false;
    }
  }

  /**
   * 清除过期缓存
   */
  clearOverdue() {
    // let cacheList = uni.getStorageInfoSync(),that = this;
    // if (typeof cacheList.keys === 'object'){
    // 	cacheList.keys.forEach(item=>{
    // 		that.getExpireCahe(item);
    // 	})
    // }
  }
}


export default new Cache;