/**
   * 获取缓存
   * @param String $key  key
   * @param String $def  若想要无缓存时，返回默认值则get('key','默认值')（支持字符串、json、数组、boolean等等）
   * @return value;
   */
  function get (key, def = '') {
    const  timeout = parseInt(wx.getStorageSync(`${key}__separator__`) || 0);
    // 过期失效
    if (timeout) {
        if (Date.now() > timeout) {
            this.remove(key);
            return;
        }
    }
    let value = wx.getStorageSync(key);
    return value ? value : def;
}

/**
 * 设置缓存
 * @param String $key       key
 * @param String $value     value（支持字符串、json、数组、boolean等等）
 * @param Number $timeout   过期时间（单位：分钟）不设置时间即为永久保存
 * @return value;
 */
function put (key, value, timeout = 0) {
    let _timeout = parseInt(timeout);
    wx.setStorageSync(key, value);
    if (_timeout) {
      wx.setStorageSync(`${key}__separator__`, Date.now() + 1000 * 60 * _timeout);
    } else {
      wx.removeStorageSync(`${key}__separator__`);
    }
    return value;
}

function remove (key) {
    wx.removeStorageSync(key);
    wx.removeStorageSync(`${key}__separator__`);
    return undefined;
}

module.exports = {
    remove: remove,
    put: put,
    get: get
}