using System.Net;
using System.Net.Mime;
using System.Text.Json;

namespace BlackRock.Reporting.API.Exceptions
{
    public class ExceptionMiddleware
    {
        private readonly RequestDelegate _next;
        private readonly ILoggingBuilder _logger;
        public ExceptionMiddleware(RequestDelegate next, ILoggingBuilder logger)
        {
            _logger = logger;
            _next = next;
        }
        public async Task InvokeAsync(HttpContext httpContext)
        {
            try
            {
                await _next(httpContext);
            }
            catch (Exception ex)
            {
                //_logger.LogError($"Something went wrong: {ex}");
                await HandleExceptionAsync(httpContext, ex);
            }
        }
        private async Task HandleExceptionAsync(HttpContext context, Exception exception)
        {
            context.Response.ContentType = "application/json";
            context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
            await context.Response.WriteAsync(new Error()
            {
                StatusCode = (HttpStatusCode)context.Response.StatusCode,
                Title = "Internal Server Error from the custom middleware."
            }.ToString());
        }
    }
    public class ApplicationExceptionMiddlewareBase
    {
        private readonly RequestDelegate next;
        private readonly IExceptionHandler exceptionHandler;
        private readonly ILogger<ApplicationExceptionMiddleware> logger;
        public ApplicationExceptionMiddlewareBase(RequestDelegate next, IExceptionHandler exceptionHandler, ILogger<ApplicationExceptionMiddleware> logger)
        {
            this.next = next;
            this.exceptionHandler = exceptionHandler;
            this.logger = logger;
        }
        public async Task InvokeAsync(HttpContext httpContext)
        {
            try
            {
                await next(httpContext);
            }
            catch (Exception ex)
            {
                var error = exceptionHandler.HandleException(ex);
                if (!httpContext.Response.HasStarted)
                {
                    httpContext.Response.Clear();
                    httpContext.Response.ContentType = MediaTypeNames.Application.Json;
                    httpContext.Response.StatusCode = (int)error.StatusCode;
                    await httpContext.Response.WriteAsync(JsonSerializer.Serialize(error));
                }
            }
        }
    }
}