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

namespace IStation.DataDockingApi
{
    /// <summary>
    /// Token
    /// </summary>
    public class TokenHelper
    {
        private static DateTime _lastTokenTime ;
        private static string _token = null;

        //获取Token
        private static string GetToken()
        {
            var result = HttpRequestHelper.Login();
            if(result==null)
                return default;
            if (result.status != "SUCCESS")
                return default;
            return result.content.token;
        }

        //验证过期时间
        private static bool Verify()
        {
            var appParas = AppParasHelper.Get();
            if (_lastTokenTime.AddHours(appParas.expire) <= DateTime.Now)
            {
                return false;  
            }
            return true;
        }

        /// <summary>
        /// 获取
        /// </summary>
        public static string Get()
        {
            if (string.IsNullOrEmpty(_token))
            {
                _token = GetToken();
                _lastTokenTime = DateTime.Now;
            }
            if (!Verify())
            {
                _token = GetToken();
                _lastTokenTime = DateTime.Now;
            }
            return _token;
        }

    }
}