using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using StackExchange.Profiling.Internal;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using WIDESEA_Core.Helper;
using WIDESEA_Core.LogHelper;

namespace WIDESEA_Core.Middlewares
{
    /// <summary>
    /// 记录请求和响应数据
    /// </summary>
    public class ApiLogMiddleware
    {
        /// <summary>
        /// 
        /// </summary>
        private readonly RequestDelegate _next;

        public ApiLogMiddleware(RequestDelegate next, ILogger<ApiLogMiddleware> logger)
        {
            _next = next;
        }

        //todo
        /// <summary>
        /// API日志中间件，用于处理HTTP请求和响应的日志记录
        /// </summary>
        /// <remarks>
        /// 1. 检查系统过期时间，若过期则返回500错误
        /// 2. 仅处理包含"api"路径的请求
        /// 3. 记录请求和响应数据到日志系统
        /// 4. 支持通过配置忽略特定URL的日志记录
        /// </remarks>
        /// <param name="context">当前HTTP上下文</param>
        /// <returns>异步任务</returns>
        public async Task InvokeAsync(HttpContext context)
        {
            if (App.ExpDateTime != null && (DateTime.Now - App.ExpDateTime.GetValueOrDefault()).TotalSeconds > 0)
            {
                context.Response.StatusCode = HttpStatusCode.InternalServerError.ObjToInt();
                context.Response.ContentType = "application/json";

                var json = new WebResponseContent();

                json.Message = HttpStatusCode.InternalServerError.ToString();//错误信息
                json.Code = 500;//500异常 

                StreamWriter streamWriter = new StreamWriter(context.Response.Body);
                await streamWriter.WriteAsync(json.Serialize());
                return;
            }

            // 过滤，只有接口
            if (context.Request.Path.Value?.Contains("api") ?? false)
            {
                context.Request.EnableBuffering();
                Stream originalBody = context.Response.Body;
                string requestParam = string.Empty;
                string responseParam = string.Empty;
                try
                {
                    string? apiIgnore = AppSettings.GetValue("ApiLogIgnore")?.ToString();
                    string[] ignoreUrls = !string.IsNullOrEmpty(apiIgnore) ? apiIgnore.Split(",") : new string[] { "get" };

                    (context.RequestServices.GetService(typeof(RequestLogModel)) as RequestLogModel).RequestDate = DateTime.Now;
                    try
                    {
                        // 存储请求数据
                        requestParam = RequestDataLog(context);
                        context.Request.Body.Position = 0;
                    }
                    catch { }
                    using MemoryStream ms = new();
                    context.Response.Body = ms;

                    await _next(context);

                    try
                    {
                        // 存储响应数据
                        responseParam = ResponseDataLog(context.Response);
                    }
                    catch { }

                    ms.Position = 0;
                    await ms.CopyToAsync(originalBody);

                    if (!ignoreUrls.Any(x => context.Request.Path.Value?.Contains(x) ?? false))
                    {
                        Logger.Add(requestParam, responseParam);
                    }
                }
                catch (Exception ex)
                {
                    // 记录异常

                }
                finally
                {
                    context.Response.Body = originalBody;
                }
            }
            else
            {
                await _next(context);
            }
        }

        private string RequestDataLog(HttpContext context)
        {
            var request = context.Request;
            var sr = new StreamReader(request.Body);

            object obj = new
            {
                QueryString = request.QueryString.ToString(),
                BodyData = sr.ReadToEndAsync().Result
            };

            string data = JsonConvert.SerializeObject(obj);

            request.Body.Position = 0;

            return data;
        }

        private string ResponseDataLog(HttpResponse response)
        {
            response.Body.Position = 0;
            using StreamReader stream = new StreamReader(response.Body, leaveOpen: true);
            string body = stream.ReadToEnd();
            response.Body.Position = 0;
            return body;
        }
    }
}