using HealthMonitor.Common;
using HealthMonitor.WebApi.Controllers.Api;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using System.IO;
using System.Net;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;

namespace HealthMonitor.WebApi.Middleware
{
    public class LoggingMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly ILogger<LoggingMiddleware> _logger;

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

        //public async Task InvokeAsync(HttpContext context)
        //{
        //    //// 在请求处理之前记录日志
        //    //using (_logger.BeginScope(new Dictionary<string, object> { ["RequestId"] = "" }))
        //    using (new CustomizeStopWatch(nameof(LoggingMiddleware), _logger))
        //    {
        //        var request = await FormatRequest(context.Request);

        //        _logger.LogInformation(request);

        //        var originalBodyStream = context.Response.Body;

        //        using var responseBody = new MemoryStream();
        //        context.Response.Body = responseBody;

        //        await _next(context);

        //        var response = await FormatResponse(context.Response);

        //        _logger.LogInformation(response);

        //        await responseBody.CopyToAsync(originalBodyStream);
        //    }
        //}

        public async Task InvokeAsync(HttpContext context)
        {
            //// 在请求处理之前记录日志
            //using (_logger.BeginScope(new Dictionary<string, object> { ["RequestId"] = "" }))
            using (new CustomizeStopWatch(nameof(LoggingMiddleware), _logger))
            {
                using var responseBody = new MemoryStream();
                var originalBodyStream = context.Response.Body;
                try
                {

                    var request = await FormatRequest(context.Request);
                    _logger.LogInformation(request);
                    context.Response.Body = responseBody;
                    await _next(context);
                }
                catch (Exception ex)
                {
                    await HandleExceptionAsync(context, ex); // 捕获异常了 在HandleExceptionAsync中处理
                }

                var response = await FormatResponse(context.Response);
                _logger.LogInformation(response);
                await responseBody.CopyToAsync(originalBodyStream);
            }
        }

        private async Task<string> FormatRequest(HttpRequest request)
        {
            request.EnableBuffering();

            var body = await new StreamReader(request.Body).ReadToEndAsync();
            var formattedBody = FormatJson(body);

            request.Body.Position = 0;

            return $"请求: {request.Scheme} {request.Host}{request.Path} {request.QueryString} {formattedBody}";
        }

        private async Task<string> FormatResponse(HttpResponse response)
        {
            response.Body.Seek(0, SeekOrigin.Begin);

            var body = await new StreamReader(response.Body).ReadToEndAsync();
            var formattedBody = FormatJson(body);

            response.Body.Seek(0, SeekOrigin.Begin);

            return $"响应: {response.StatusCode}: {formattedBody}";
        }

        private static string FormatJson(string json)
        {
            if (string.IsNullOrEmpty(json))
            {
                return string.Empty;
            }

            try
            {
                var obj = JsonConvert.DeserializeObject(json);
                // return JsonConvert.SerializeObject(obj, Formatting.Indented);
                return JsonConvert.SerializeObject(obj);
            }
            catch
            {
                return json;
            }
        }

        private async Task HandleExceptionAsync(HttpContext context, Exception exception)
        {
            context.Response.ContentType = "application/json";  // 返回json 类型
            var response = context.Response;

            var errorResponse = new ErrorResponse
            {
                Success = false
            };  // 自定义的异常错误信息类型
            switch (exception)
            {
                case ApplicationException ex:
                    if (ex.Message.Contains("Invalid token"))
                    {
                        response.StatusCode = (int)HttpStatusCode.Forbidden;
                        errorResponse.Message = ex.Message;
                        break;
                    }
                    response.StatusCode = (int)HttpStatusCode.BadRequest;
                    errorResponse.Message = ex.Message;
                    break;
                case KeyNotFoundException ex:
                    response.StatusCode = (int)HttpStatusCode.NotFound;
                    errorResponse.Message = ex.Message;
                    break;
                default:
                    response.StatusCode = (int)HttpStatusCode.InternalServerError;
                    errorResponse.Message = "Internal Server errors. Check Logs!";
                    break;
            }
            //_logger.LogError(exception.Message);
            //var result =JsonConvert.SerializeObject(ApiResponse<object>.Fail(response.StatusCode, $"{exception.Message}"));
            //await context.Response.WriteAsync(JsonConvert.SerializeObject(result));

            // Create the error response using ApiResponse.Fail
            var apiResponse = ApiResponse<object>.Fail(response.StatusCode, $"{exception.Message}\n{exception.InnerException}\n{exception.StackTrace}");

            // Convert the ApiResponse to JSON string
            var resultJson = JsonConvert.SerializeObject(apiResponse);

            // Convert the JSON string to bytes using UTF-8 encoding
            var resultBytes = Encoding.UTF8.GetBytes(resultJson);

            await response.Body.WriteAsync(resultBytes, 0, resultBytes.Length);

            var responseStr = await FormatResponse(context.Response);

            _logger.LogError(responseStr);
        }

        internal class ErrorResponse
        {
            public bool Success { get; set; }

            public string Message { get; set; } = String.Empty;
        }
    }
}