using System;
using Newtonsoft.Json;

namespace GSYWApi.Helper
{
    /// <summary>
    /// 公共方法
    /// </summary>
    public class Common
    {
        /// <summary>
        /// 判断是否是偶数
        /// </summary>
        /// <param name="n"></param>
        /// <returns></returns>
        public static bool IsOdd(int n)
        {
            return Convert.ToBoolean(n % 2 == 0);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="code"></param>
        /// <param name="msg"></param>
        /// <param name="data"></param>
        /// <returns></returns>
        public static object ReturnJson(int code, string msg, object data = null)
        {
            Models.Result result = new Models.Result();
            result.Result_Data = data;
            result.Result_Code = code;
            result.Result_Desc = msg;
            return result;
        }

        /// <summary>
        /// 创建登录秘钥
        /// </summary>
        /// <param name="UserID">session_key是微信服务器生成的针对用户数据加密的秘钥</param>
        /// <param name="UserName"></param>
        /// <param name="LoggingTime"></param>
        /// <returns>返回加密串</returns>
        public static string CreateAccessToken(int? UserID, string UserName, DateTime? LoggingTime)
        {
            Model.AccessToken accessToken = new Model.AccessToken();
            accessToken.UserID = UserID;
            accessToken.UserName = UserName;
            accessToken.LoggingTime = LoggingTime == null ? DateTime.Now : LoggingTime.Value;

            return JsonConvert.SerializeObject(accessToken).ToEncrypt();
        }

        /// <summary>
        /// 验证加密串中的LoggingTime是否过期
        /// </summary>
        /// <param name="accessToken">第一次登录生成的加密串</param>
        /// <returns></returns>
        public static bool CheckSession(string accessToken)
        {
            Model.AccessToken accessTokenModel = JsonConvert.DeserializeObject<Model.AccessToken>(accessToken.ToDecrypt());

            TimeSpan ts = DateTime.Now - accessTokenModel.LoggingTime.Value;
            int validSecond = 2 * 60 * 60;//设置2小时过期
            if (ts.TotalSeconds >= validSecond)
            {
                return false;
            }

            return true;
        }
    }
}