using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Http;
using NetTaste;
using OASystem.API.OAMethodLib.JuHeAPI;
using OASystem.Domain.Dtos.Business;
using SqlSugar.Extensions;
using System.IdentityModel.Tokens.Jwt;
using System.Security.Claims;
using static NPOI.HSSF.Util.HSSFColor;

namespace OASystem.API.OAMethodLib
{
    public class JWTHelper
    {
        public class JwtHelper
        {


            private readonly static IHttpContextAccessor _httpContextAccessor = AutofacIocManager.Instance.GetService<IHttpContextAccessor>();
            /// <summary>
            /// 颁发JWT字符串
            /// </summary>
            /// <param name="tokenModel"></param>
            /// <returns></returns>
            public static async Task<string> IssueJwtAsync(TokenModelJwt tokenModel)
            {
                //  appsettign.json 操作类
                string iss = "OASystem.com";
                string aud = "OASystem.com";
                string secret = AppSettingsHelper.Get("JwtSecurityKey");

                var claims = new List<Claim>
              {
                 /*
                 * 特别重要：
                   1、这里将用户的部分信息，比如 uid 存到了Claim 中，如果你想知道如何在其他地方将这个 uid从 Token 中取出来，请看下边的SerializeJwt() 方法，或者在整个解决方案，搜索这个方法，看哪里使用了！
                   2、你也可以研究下 HttpContext.User.Claims ，具体的你可以看看 Policys/PermissionHandler.cs 类中是如何使用的。
                 */                

                new Claim(JwtRegisteredClaimNames.Jti, tokenModel.UserId.ToString()),
                //new Claim(JwtRegisteredClaimNames.GivenName, tokenModel.UserName),
                new Claim("UserName", tokenModel.UserName),
                //new Claim("UserId", tokenModel.UserId.ToString()),
                new Claim(JwtRegisteredClaimNames.Iat, $"{new DateTimeOffset(DateTime.Now).ToUnixTimeSeconds()}"),
                new Claim(JwtRegisteredClaimNames.Nbf,$"{new DateTimeOffset(DateTime.Now).ToUnixTimeSeconds()}") ,
                //这个就是过期时间，目前是过期7200秒，可自定义，注意JWT有自己的缓冲过期时间
                new Claim(JwtRegisteredClaimNames.Exp,$"{new DateTimeOffset(DateTime.Now.AddSeconds(7200)).ToUnixTimeSeconds()}"),
                new Claim(JwtRegisteredClaimNames.Iss,iss),
                new Claim(JwtRegisteredClaimNames.Aud,aud),
                
                //new Claim(ClaimTypes.Role,tokenModel.Role),//为了解决一个用户多个角色(比如：Admin,System)，用下边的方法
               };

                // 可以将一个用户的多个角色全部赋予；
                claims.AddRange(tokenModel.Role.Split(',').Select(s => new Claim(ClaimTypes.Role, s)));


                //秘钥 (SymmetricSecurityKey 对安全性的要求，密钥的长度太短会报出异常)
                var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(secret));
                var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

                var jwt = new JwtSecurityToken(
                    issuer: iss,
                    claims: claims,
                    signingCredentials: creds
                    //,expires:DateTime.Now.AddMinutes(1)
                    );

               // var indentity = new ClaimsIdentity(claims, "FMGJ-OASystem");
               // var principal = new ClaimsPrincipal(indentity);

               //await _httpContextAccessor.HttpContext?.SignInAsync(CookieAuthenticationDefaults.AuthenticationScheme, principal);
                

                var jwtHandler = new JwtSecurityTokenHandler();
                var encodedJwt = jwtHandler.WriteToken(jwt);

                return encodedJwt;
            }

            /// <summary>
            /// 解析
            /// </summary>
            /// <param name="jwtStr"></param>
            /// <returns></returns>
            public static TokenModelJwt SerializeJwt(string jwtStr)
            {
                var jwtHandler = new JwtSecurityTokenHandler();
                JwtSecurityToken jwtToken = jwtHandler.ReadJwtToken(jwtStr);
                object role,userName;
                try
                {
                    jwtToken.Payload.TryGetValue(ClaimTypes.Role, out role);
                    jwtToken.Payload.TryGetValue("UserName", out userName);
                }
                catch (Exception e)
                {
                    Console.WriteLine(e);
                    throw;
                }

                var tm = new TokenModelJwt
                {
                    UserId = (jwtToken.Id).ObjToInt(),
                    UserName = userName != null ? userName.ObjToString() : "",
                    Role = role != null ? role.ObjToString() : "",
                };
                return tm;
            }
        }

        /// <summary>
        /// 令牌
        /// </summary>
        public class TokenModelJwt
        {
            /// <summary>
            /// Id
            /// </summary>
            public int UserId { get; set; }

            public string UserName { get; set; }

            public string Role { get; set; } = "Admin";

            /// <summary>
            /// 过期时间，默认过期7200秒
            /// 注意JWT有自己的缓冲过期时间
            /// </summary>
            public int ExpirationTime { get; set; } = 7200;

        }
    }
}