using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using WMS.Web.Core.Dto.Login;
using WMS.Web.Domain.IService.Public;
using WMS.Web.Domain.Services.Public;

namespace WMS.Web.Repositories.DependencyInjection
{
    /// <summary>
    /// token 黑名单中间件
    /// </summary>
    public class AuthorizationTokenSecurityPolicy
    {
        private readonly RequestDelegate _next;
        private readonly IMemoryCache _cache;
        private ILogger<AuthorizationTokenSecurityPolicy> _logger;
        private DateTime _refreshTime = DateTime.Now.AddYears(-5);
        private readonly RedisClientService _redisClientService;

        /// <summary>
        /// token黑名单中间件
        /// </summary>
        /// <param name="next"></param>
        /// <param name="cache"></param>
        public AuthorizationTokenSecurityPolicy(RequestDelegate next, ILogger<AuthorizationTokenSecurityPolicy> logger, IMemoryCache cache, RedisClientService redisClientService)
        {
            _next = next;
            _cache = cache;
            this._logger = logger;
            _redisClientService = redisClientService;
        }

        /// <summary>
        /// 事件
        /// </summary>
        /// <param name="context"></param>
        /// <returns></returns>
        public async Task Invoke(HttpContext context, ILoginService loginService)
        {
            string authorization = context.Request.Headers["Authorization"];
            string path = context.Request.Path.Value.ToLower();
            string[] pathlist = path.Split('/');
            bool isLogin = pathlist.Where(x => x == "login" || x.ToLower() == "heart"
            || x.ToLower() == "test" || x.ToLower() == "serialnumber" || x.ToLower() == "barcode" ||
            x.ToLower() == "swagger").Any();
            if (isLogin)
            {
                context.Response.StatusCode = 200;
                await _next(context);
                return;
            }

            if (string.IsNullOrEmpty(authorization))
            {
                context.Response.StatusCode = 401;
                var result = JsonConvert.SerializeObject(new { status = 401, data = string.Empty, message = "授权失败，请重新登录" });
                context.Response.ContentType = "application/json;charset=utf-8";
                await context.Response.WriteAsync(result);
                return;
            }
            else
            {
                string token = string.Empty;
                if (authorization.StartsWith("Bearer ", StringComparison.OrdinalIgnoreCase))
                {
                    token = authorization.Substring("Bearer ".Length).Trim();
                }

                //判断前端过来的token
                if (string.IsNullOrEmpty(token))
                {
                    context.Response.StatusCode = 401;
                    var result = JsonConvert.SerializeObject(new { status = 401, data = string.Empty, message = "授权失败，请重新登录" });
                    context.Response.ContentType = "application/json;charset=utf-8";
                    await context.Response.WriteAsync(result);
                    return;
                }

                //1.验证是否有登录数据缓存
                var logininfo = _redisClientService.GetStringKey<LoginInDto>($"wms_login_{token}");
                if (logininfo == null)
                {
                    context.Response.StatusCode = 401;
                    var result = JsonConvert.SerializeObject(new { status = 401, data = string.Empty, message = "授权失败，请重新登录" });
                    context.Response.ContentType = "application/json;charset=utf-8";
                    await context.Response.WriteAsync(result);
                    return;

                }
                else
                {
                    //验证响应状态为401的就调用单点退出接口
                    if (context.Response.StatusCode == 401 || context.Response.StatusCode == 403)
                    {
                        if (logininfo.UserInfo != null && logininfo.TokenInfo != null)
                        {
                            //调用单点的退出接口    
                            var dto = new LoginOutDto()
                            {
                                UcId = logininfo.UserInfo.UcId.ToString(),
                                SessionId = logininfo.UserInfo.SeesionId,
                                Token = logininfo.TokenInfo.Token,
                                RefreshToken = logininfo.TokenInfo.RefreshToken,
                                AccessToken = logininfo.TokenInfo.PhpToken,
                                ExpiresIn = logininfo.TokenInfo.Expired

                            };
                            var res = await loginService.LoginOut(dto);
                            return;
                        }
                    }

                    DateTime now = DateTime.Now;
                    TimeSpan jiange_timespan = TimeSpan.Zero;
                    if (logininfo.TokenInfo.Expired < now)
                    {
                        jiange_timespan = now - logininfo.TokenInfo.Expired;
                        var info = _redisClientService.GetStringKey<LoginInDto>($"wms_login_{token}");

                        if (info != null)
                        {
                            //超过16个小时的，就要移除缓存
                            if (jiange_timespan.TotalHours >= 16)
                                _redisClientService.RemoveStringKey($"wms_login_{token}");
                            //超过1个小时的，就要刷新token
                            else if (!string.IsNullOrEmpty(logininfo.TokenInfo.Token) && jiange_timespan.TotalHours >= 1)
                                this.RefreshToken(logininfo.TokenInfo.Token, logininfo.TokenInfo.RefreshToken, loginService);

                        }
                    }
                    //else 
                    //{
                    //    //刷新token:距离过期时间还有10分钟就进行刷新token
                    //    jiange_timespan = logininfo.TokenInfo.Expired - now;
                    //    if (!string.IsNullOrEmpty(logininfo.TokenInfo.Token) && jiange_timespan.TotalMinutes<=10)
                    //        this.RefreshToken(logininfo.TokenInfo.Token, logininfo.TokenInfo.RefreshToken, loginService);
                    //}

                    //3.验证检查是否有黑名单的token缓存
                    string blacktoken = _redisClientService.GetStringKey($"wms_black_token_{logininfo.UserInfo.UcId}");
                    if (string.IsNullOrEmpty(blacktoken))
                    {
                        context.Response.StatusCode = 200;
                        await _next(context);
                    }
                    else
                    {
                        RemoveRedisLoginInfo(token);
                        context.Response.StatusCode = 403;
                        var result = JsonConvert.SerializeObject(new { status = 403, data = string.Empty, message = "拒绝用户证书试图访问此web站点，请与站点管理员联系以建立用户证书权限" });
                        context.Response.ContentType = "application/json;charset=utf-8";
                        await context.Response.WriteAsync(result);
                    }
                }

            }
        }

        /// <summary>
        /// 过期，或者失效，移出token
        /// </summary>
        /// <param name="token"></param>
        private void RemoveRedisLoginInfo(string token)
        {
            if (!string.IsNullOrEmpty(token))
            {
                var info = _redisClientService.GetStringKey<LoginInDto>($"wms_login_{token}");
                if (info != null)
                {
                    _redisClientService.RemoveStringKey($"wms_login_{token}");
                }
            }
        }


        /// <summary>
        /// 刷新token
        /// </summary>
        /// <param name="RefreshToken"></param>
        /// <returns></returns>
        private bool RefreshToken(string OldToken, string RefreshToken, ILoginService _loginService)
        {
            var res = _loginService.RefreshTokenNew(OldToken, RefreshToken);
            if (!res.Result.Success)
                return false;
            else
                return true;
        }
    }
}