using JWT.Algorithms;
using JWT.Builder;
using JWT.Exceptions;
using learun.util;
using System;

namespace learun.operat
{
	/// <summary>
	/// 版 本 EasyCode EC管理后台
	/// Copyright (c) 2019-present EC管理有限公司
	/// 创建人：tobin
	/// 日 期：2019.09.12
	/// 描 述：当前连接用户信息处理类
	/// </summary>
	public class Operator : IOperator
	{
		//private readonly ICache _cache;
		//public Operator(ICache cache) {
		//    _cache = cache;
		//}
		///// <summary>
		///// 判断是否登录
		///// </summary>
		///// <param name="account">账号</param>
		///// <param name="token">token</param>
		///// <returns></returns>
		//public async Task<bool> IsOnLine(string account,string token)
		//{
		//    try
		//    {
		//        string accountTmp = await _cache.ReadAsync<string>(token);

		//        if (account == accountTmp)
		//        {
		//            return true;
		//        }
		//        else {
		//            return false;
		//        }
		//    }
		//    catch (Exception)
		//    {
		//        return false;
		//    }
		//}
		///// <summary>
		///// 添加登录者(保存一天时间)
		///// </summary>
		///// <param name="account">账号</param>
		///// <returns></returns>
		//public async Task<string> AddLoginUser(string account) {
		//    string token = Guid.NewGuid().ToString();
		//    TimeSpan ts = new TimeSpan(1, 0, 0, 0);
		//    var list = await _cache.ReadAsync<List<string>>(account);
		//    if (list == null) {
		//        list = new List<string>();
		//    }
		//    list.Add(token);
		//    await _cache.WriteAsync(account, list, ts);
		//    await _cache.WriteAsync(token, account, ts);
		//    return token;
		//}

		///// <summary>
		///// 清除登录者信息
		///// </summary>
		///// <param name="account">登录者用户账号</param>
		///// <returns></returns>
		//public async Task ClearLoginUser(string account)
		//{
		//    var list = await _cache.ReadAsync<List<string>>(account);
		//    if (list != null)
		//    {
		//        foreach (var token in list)
		//        {
		//            await _cache.RemoveAsync(token);
		//        }
		//        await _cache.RemoveAsync(account);
		//    }
		//}

		/// <summary>
		/// 生成jwt令牌
		/// </summary>
		/// <param name="userId">用户id</param>
		/// <param name="userName">用户名称</param>
		/// <param name="account">用户账号</param>
		/// <returns></returns>
		public string EncodeToken(string userId, string userName, string account)
		{
			var token = new JwtBuilder()
			.WithAlgorithm(new HMACSHA256Algorithm())
			.WithSecret(ConfigHelper.GetConfig().JwtSecret)
			.AddClaim("iat", DateTimeOffset.UtcNow.ToUnixTimeSeconds())
			.AddClaim("exp", DateTimeOffset.UtcNow.AddHours(12).ToUnixTimeSeconds()) // 设置12小时过期
			.AddClaim("UserId", userId).AddClaim("UserName", userName).AddClaim("Account", account)
			.Encode();

			return token;
		}

		/// <summary>
		/// 解密jwt令牌
		/// </summary>
		/// <param name="token">令牌</param>
		/// <returns>TokenExpiredException 时间过期,SignatureVerificationException 签证不正确</returns>
		public string DecodeToken(string token)
		{
			try
			{
				var json = new JwtBuilder()
					.WithAlgorithm(new HMACSHA256Algorithm())
					.WithSecret(ConfigHelper.GetConfig().JwtSecret)
					.MustVerifySignature()
					.Decode(token);
				return json;
				//Console.WriteLine(json);
			}
			catch (TokenExpiredException)
			{
				return "TokenExpiredException";
				//Console.WriteLine("Token has expired");
			}
			catch (SignatureVerificationException)
			{
				return "SignatureVerificationException";
				//Console.WriteLine("Token has invalid signature");
			}
		}
	}
}