using Furion;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Diagnostics;
using Microsoft.AspNetCore.Http;
using Nirvana.Common;
using Nirvana.Common.ApiBase;
using System;
using System.IO;
using System.Threading.Tasks;
using YBDevice.Core;

namespace YBDevice.NApi
{
    /// <summary>
    /// 异常处理中间件
    /// </summary>
    //public class MyExceptionMiddleware
    //{
    //    private readonly RequestDelegate _next;
    //    public MyExceptionMiddleware(RequestDelegate next)
    //    {
    //        _next = next;
    //    }
    //    public async Task Invoke(HttpContext httpContext)
    //    {
    //        try
    //        {
    //            await _next(httpContext);
    //        }
    //        catch (Exception ex)
    //        {
    //            //  new ApiLoggerApplication().InsertErrorLog(ex);
    //            await HandleExceptionAsync(httpContext, ex);
    //        }
    //    }

    //    private Task HandleExceptionAsync(HttpContext httpContext, Exception ex)
    //    {
    //        //记录日志
    //        //  new ApiLoggerApplication().InsertErrorLog(ex);
    //        return Task.CompletedTask;
    //    }

    //    public void OnException(ExceptionContext context)
    //    {
    //        context.ExceptionHandled = true;
    //    }
    //}

    ///// <summary>
    ///// Extension method used to add the middleware to the HTTP request pipeline.
    ///// </summary>
    //public static class MyExceptionMiddlewareExtensions
    //{
    //    public static IApplicationBuilder UseMyExceptionMiddleware(this IApplicationBuilder builder)
    //    {
    //        return builder.UseMiddleware<MyExceptionMiddleware>();
    //    }
    //}

    public static class ExceptionHandlingExtensions
    {
        public static void UseMyExceptionHandler(this IApplicationBuilder app)
        {
            app.UseExceptionHandler(builder =>
            {

                builder.Run(async context =>
                {
                    context.Response.StatusCode = StatusCodes.Status500InternalServerError;
                    context.Response.ContentType = "application/json";
                    var ex = context.Features.Get<IExceptionHandlerFeature>();
                    //如果是用户取消的异常,则不必记录到日志
                    if (context.RequestAborted.IsCancellationRequested && (ex is TaskCanceledException || ex is OperationCanceledException))
                    {
                        Console.WriteLine("用户取消了操作");
                    }
                    else
                    {
                        if (ex != null)
                        {
                            var request = context.Request;
                            var action = request.Path.Value;
                            var query_string = request.QueryString.Value;
                            if (request.Method == "POST" && request.ContentLength > 0)
                            {
                                request.EnableBuffering();
                                request.Body.Position = 0;
                                using (var sr = new StreamReader(request.Body))
                                {
                                    query_string = await sr.ReadToEndAsync();
                                }
                            }
                            //获取token
                            var token = request.Headers["token"];
                            if (!string.IsNullOrEmpty(token))
                            {
                                query_string = $"{query_string}\r\ntoken={token}";
                            }
                            var _logger = App.GetService<ILoggerService>();
                            //记录日志
                            _logger.AddErrorLogger(ex.Error, query_string, action);
                        }
                    }
                    var result = new ResultInfo { code = ResultState.SYSTEMERROR, message = ex?.Error?.Message ?? "系统异常" };
                    context.Response.StatusCode = 200;
                    await context.Response.WriteAsync(result.ToJson());
                });
            });
        }
    }
}