using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace CarLocalMeter
{
    /// <summary>
    /// 缓存接口
    /// </summary>
    public interface ICache
    {
        #region 设置缓存
        /// <summary>
        /// 设置缓存
        /// 注：默认过期类型为绝对过期
        /// </summary>
        /// <param name="key">主键</param>
        /// <param name="value">值</param>
        /// <param name="timeout">过期时间间隔</param>
        /// <param name="expireType">过期类型</param>
        void SetCache(string key, object value, int timeout = 0, ExpireType expireType = default);


        /// <summary>
        /// 设置键失效时间
        /// </summary>
        /// <param name="key">键值</param>
        /// <param name="expire">从现在起时间间隔</param>
        void SetKeyExpire(string key, int expire);

        #endregion

        #region 获取缓存
        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="key">主键</param>
        /// <typeparam name="T">数据类型</typeparam>
        T GetCache<T>(string key);
        #endregion

        #region 删除缓存

        /// <summary>
        /// 清除缓存
        /// </summary>
        /// <param name="key">主键</param>
        void RemoveCache(string key);

        #endregion
    }

    #region 类型定义

    /// <summary>
    /// 值信息
    /// </summary>
    public struct ValueInfoEntry
    {
        public string Value { get; set; }
        public string TypeName { get; set; }
        public int ExpireTime { get; set; }
        public ExpireType? ExpireType { get; set; }
    }

    /// <summary>
    /// 过期类型
    /// </summary>
    public enum ExpireType
    {
        /// <summary>
        /// 绝对过期
        /// 注：即自创建一段时间后就过期
        /// </summary>
        Absolute,

        /// <summary>
        /// 相对过期
        /// 注：即该键未被访问后一段时间后过期，若此键一直被访问则过期时间自动延长
        /// </summary>
        Relative,
    }

    #endregion
}