using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;
using System.Net;
using Znyc.CloudCar.Model.ViewModels.ReportsCallBack;

namespace Znyc.CloudCar.Middlewares
{
    /// <summary>
    /// 异常错误统一返回记录
    /// </summary>
    public class ExceptionHandlerMid
    {
        private readonly RequestDelegate _next;


        public ExceptionHandlerMid(RequestDelegate next)
        {
            _next = next;
        }

        public async Task Invoke(HttpContext context)
        {
            try
            {
                await _next(context);
            }
            catch (Exception ex)
            {
                await HandleExceptionAsync(context, ex);
            }
        }

        private async Task HandleExceptionAsync(HttpContext context, Exception ex)
        {
            if (ex == null) return;


            await WriteExceptionAsync(context, ex).ConfigureAwait(false);
        }

        private static async Task WriteExceptionAsync(HttpContext context, Exception e)
        {
            if (e is UnauthorizedAccessException)
                context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
            else if (e is Exception)
                context.Response.StatusCode = (int)HttpStatusCode.BadRequest;

            context.Response.ContentType = "application/json";
            var ro = new ResponseOutput();
            ro.Successed = false;
            ro.Data = e;
            ro.Msg = "全局数据异常";
            await context.Response.WriteAsync(JsonConvert.SerializeObject(ro)).ConfigureAwait(false);
        }
    }
}