using EntrustSettle.Model;
using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;
using System;
using System.Net;
using System.Threading.Tasks;

namespace EntrustSettle.Extensions.Middlewares
{
    public class ExceptionHandlerMiddleware
    {
        private readonly RequestDelegate _next;

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

        public async Task Invoke(HttpContext context)
        {
            try
            {
                await _next(context);
            }
            catch (Exception ex)
            {
                if (ex == null) return;

                var message = ex.Message;
                switch (ex)
                {
                    case UnauthorizedAccessException:
                        context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
                        break;
                    default:
                        context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
                        break;
                }

                context.Response.ContentType = "application/json";

                await context.Response
                    .WriteAsync(JsonConvert.SerializeObject(new ApiResponse(StatusCode.CODE500, message).MessageModel))
                    .ConfigureAwait(false);
            }
        }
    }
}