using EntrustSettle.Common;
using EntrustSettle.Common.HttpContextUser;
using EntrustSettle.Common.LogHelper;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace EntrustSettle.Extensions.Middlewares
{
    /// <summary>
    /// 中间件
    /// 记录用户方访问数据
    /// </summary>
    public class RecordAccessLogsMiddleware
    {
        /// <summary>
        /// 
        /// </summary>
        private readonly RequestDelegate _next;

        private readonly IUser _user;
        private readonly ILogger<RecordAccessLogsMiddleware> _logger;
        private readonly IWebHostEnvironment _environment;
        private Stopwatch _stopwatch;

        /// <summary>
        /// 
        /// </summary>
        /// <param name="next"></param>
        public RecordAccessLogsMiddleware(RequestDelegate next, IUser user, ILogger<RecordAccessLogsMiddleware> logger,
            IWebHostEnvironment environment)
        {
            _next = next;
            _user = user;
            _logger = logger;
            _environment = environment;
            _stopwatch = new Stopwatch();
        }

        public async Task InvokeAsync(HttpContext context)
        {
            if (!AppSettings.app("Middleware", "RecordAccessLogs", "Enabled").ObjToBool())
            {
                await _next(context);
                return;
            }

            // 判断如果请求中含有文件上传，不记录日志
            if (context.Request.HasFormContentType && context.Request.Form.Files.Count > 0)
            {
                await _next(context);
                return;
            }

            // 过滤，只有接口才记录
            var api = context.Request.Path.ObjToString().TrimEnd('/');
            var ignoreApis = AppSettings.app("Middleware", "RecordAccessLogs", "IgnoreApis");
            if (!api.Contains("api",StringComparison.OrdinalIgnoreCase) || ignoreApis.Contains(api,StringComparison.OrdinalIgnoreCase))
            {
                await _next(context);
                return;
            }

            _stopwatch.Restart();
            var userAccessModel = new UserAccessModel();

            HttpRequest request = context.Request;

            userAccessModel.API = api;
            userAccessModel.User = _user.Name;
            userAccessModel.IP = GetClientIP(context);
            userAccessModel.BeginTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
            userAccessModel.RequestMethod = request.Method;
            userAccessModel.Agent = request.Headers["User-Agent"].ObjToString();


            // 获取请求body内容
            if (request.Method.ToLower().Equals("post") || request.Method.ToLower().Equals("put"))
            {
                // 启用倒带功能，就可以让 Request.Body 可以再次读取
                request.EnableBuffering();

                Stream stream = request.Body;
                byte[] buffer = new byte[request.ContentLength.Value];
                stream.Read(buffer, 0, buffer.Length);
                userAccessModel.RequestData = Encoding.UTF8.GetString(buffer);

                request.Body.Position = 0;
            }
            else if (request.Method.ToLower().Equals("get") || request.Method.ToLower().Equals("delete"))
            {
                userAccessModel.RequestData = HttpUtility.UrlDecode(request.QueryString.ObjToString(), Encoding.UTF8);
            }

            await _next(context);

            // 响应完成记录时间和存入日志
            context.Response.OnCompleted(() =>
            {
                _stopwatch.Stop();

                userAccessModel.OPTime = _stopwatch.ElapsedMilliseconds + "ms";

                // 自定义log输出
                var requestInfo = JsonConvert.SerializeObject(userAccessModel);
                Parallel.For(0, 1, e =>
                {
                    //LogLock.OutSql2Log("RecordAccessLogs", new string[] { requestInfo + "," }, false);
                    LogLock.OutLogAOP("RecordAccessLogs", context.TraceIdentifier,
                        new string[] { userAccessModel.GetType().ToString(), requestInfo }, false);
                });
                return Task.CompletedTask;
            });
        }
        public static string GetClientIP(HttpContext context)
        {
            var ip = context.Request.Headers["X-Forwarded-For"].ObjToString();
            if (string.IsNullOrEmpty(ip))
            {
                ip = context.Connection.RemoteIpAddress.ObjToString();
            }

            return ip;
        }
    }
    public class UserAccessModel
    {
        public string User { get; set; }
        public string IP { get; set; }
        public string API { get; set; }
        public string BeginTime { get; set; }
        public string OPTime { get; set; }
        public string RequestMethod { get; set; }
        public string RequestData { get; set; }
        public string Agent { get; set; }
    }
}