using System.Configuration;
using System.Web;
using Nancy;
using Nancy.ErrorHandling;
using Nancy.Extensions;
using Nancy.Responses;

namespace Sony.Filtr.AdminAPI.Config
{
    public class ErrorStatusCodeHandler : IStatusCodeHandler
    {
        public void Handle(HttpStatusCode statusCode, NancyContext context)
        {
            switch (statusCode)
            {
                case HttpStatusCode.NotFound:
                    context.Response = new JsonResponse(new StatusMessage() { Message = "Resource not found."}, new DefaultJsonSerializer()).WithStatusCode(statusCode);
                    break;
                case HttpStatusCode.InternalServerError:
                    context.Response = new JsonResponse(new StatusMessage() { Message = GetErrorMessage(context)  }, new DefaultJsonSerializer()).WithStatusCode(statusCode);
                    break;
                case HttpStatusCode.BadRequest:
                    context.Response = new JsonResponse(new StatusMessage() { Message = context.Response.ReasonPhrase ?? "Bad request" }, new DefaultJsonSerializer()).WithStatusCode(statusCode);
                    break;
                case HttpStatusCode.Unauthorized:
                    context.Response = new JsonResponse(new StatusMessage() { Message = "Unauthorized" }, new DefaultJsonSerializer()).WithStatusCode(statusCode);
                    break;
                default:
                    break;
            }
        }

        private string GetErrorMessage(NancyContext context)
        {
            if (HttpContext.Current == null || HttpContext.Current.IsCustomErrorEnabled)
            {
                return "An internal error occurred.";
            }

            return context.GetException()?.InnerException?.ToString();
        }

        public bool HandlesStatusCode(HttpStatusCode statusCode, NancyContext context)
        {
            return (statusCode == HttpStatusCode.InternalServerError || statusCode == HttpStatusCode.NotFound || statusCode == HttpStatusCode.BadRequest || statusCode == HttpStatusCode.Unauthorized);
        }
    }

    public class StatusMessage
    {
        public string Message { get; set; }
    }
}